July 2024 - hpo-ims - Udfcd-Lists.Org

by f2p2＠udfcd.org

Time: 907 AM Wed July 31, 2024 Forecaster: Laura Smith ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- Another Hot, Dry, and Smoky day. Smoke from the Alexander Mountain wildfire in the Larimer County foothills, and now the Stone Canyon wildfire in the Boulder County foothills will be visible across the skies today as upper-level winds carry smoke plumes southeast. High temperatures this afternoon will be in the upper 90s, dewpoints around 30°F, and precipitable water (PWAT) values around 0.45”. These conditions will support dry weather today and tonight across the District. Overnight temperatures will dip into the low to mid 60s with dry conditions persisting tomorrow morning. STORM RAINFALL POTENTIAL AND DURATION: Rainfall is not expected in the District today. A LOOK AHEAD: The long-range forecast remains somewhat underwhelming with the arrival of an upper-level disturbance tomorrow. Atmospheric moisture will increase slightly, resulting in PWAT values up to 0.75” and dew points in the mid 40s. No significant precipitation is expected with this pattern, but there is a slight chance for isolated showers and storms tomorrow and Friday. MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789 F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]

3 months, 1 week

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Flash Flood Prediction Program

by f2p2＠udfcd.org

Time: 928 AM Tue July 30, 2024 Forecaster: Laura Smith ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- Hot, Dry, and Smokey Hot and dry conditions continue across the District today, along with smoke skies from the Alexander Mountain wildfire in Larimer County. High temperatures this afternoon will be around 100°F, dewpoints in the mid 20s, and precipitable water (PWAT) values around 0.40”. These conditions will support dry weather today and tonight across the District. Overnight lows will dip into the low to mid 60s with dry conditions persisting tomorrow morning. STORM RAINFALL POTENTIAL AND DURATION: Rainfall is not expected in the District today. A LOOK AHEAD: Tomorrow will be hot and dry with highs in the mid to upper 90s. The long-range forecast remains somewhat underwhelming with the arrival of an upper-level disturbance Thursday. Atmospheric moisture will increase slightly, resulting in PWAT values up to 0.75” and dew points in the mid 40s. No significant precipitation expected with this pattern, but there is a small chance for isolated showers and storms during the afternoon and evening. MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789 F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]

3 months, 1 week

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Flash Flood Prediction Program

by f2p2＠udfcd.org

Time: 925 AM Mon July 29, 2024 Forecaster: Tim Tonge ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- Hot and dry across District A ridge of high pressure over the south-central US will inch into Colorado today, with west-southwest flow aloft bringing hot, dry desert air into the region. Some seasonal convection over the high country far outside of the District is possible, however the District itself will remain dry. Temperatures will reach the mid 90s with a slight breeze. Precipitable water (PWAT) values around 0.30" and dewpoints below 20°F support one of the drier days of the year. Temps tonight will drop into the low 60s as dry conditions continue. STORM RAINFALL POTENTIAL AND DURATION: Rainfall is not expected in the District today. A LOOK AHEAD: This hot and dry trend will persist throughout at least tomorrow, and is anticipated to remain unchanged Wednesday as well. Temps tomorrow have potential to reach triple digits. Low-level moisture upticks Thursday, returning the chances of storms in and around the District. MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789 F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]

3 months, 1 week

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Flash Flood Prediction Program

by f2p2＠udfcd.org

Time: 919 AM Sun July 28, 2024 Forecaster: Justin Brooks ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- Hot, Sunny and Dry Today Westerly upper-level flow aloft today will result in hot, sunny, and dry conditions throughout the day and likely through most of the week. Temperatures will reach the mid to upper 90s this afternoon with low 60s overnight and into tomorrow. Winds will pick up slightly this afternoon with gusts up to 20mph at times from the W/NW. Clear skies this morning with a few scattered clouds in the afternoon and evening. STORM RAINFALL POTENTIAL AND DURATION: No precipitation is expected within the District today or this evening. A LOOK AHEAD: Slightly warmer tomorrow as high temperatures remain in the mid to upper 90s. Hot and dry Tuesday & Wednesday with highs in the upper 90s under mostly sunny skies. Similar conditions to start the day Thursday, a slight uptick in moisture will bring a slight chance for a few high-based showers and possibly an isolated thunderstorm; However, most, if not all precipitation will struggle to reach the surface. MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789 F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]

3 months, 1 week

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Flash Flood Prediction Program

by f2p2＠udfcd.org

Time: 830 PM Sat July 27, 2024 Forecaster: Aaron O'Brien ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S WILL BE ALLOWED TO EXPIRE AT 9:00 PM Message 1’s will be allowed to expire at 9pm as the threat of heavy rainfall has come to an end. After a round of showers and thunderstorms early in the afternoon, only a few very isolated showers persist west of the District. These showers/thunderstorms should weaken and dissipate over the next several hours creating minimal concern over point rainfall amounts. Mild and dry conditions are expected overnight and into daybreak tomorrow. Temperatures will drop into the mid to upper 50s for the plains with low 50s along the foothills. Tomorrow looks to be much drier with limited convection for the District, with Message chances looking very unlikely. STORM RAINFALL POTENTIAL AND DURATION: A weak shower would produce between a trace and 0.10” total in 10-30 minutes. WORST CASE SCENARIO: A stronger shower/thunderstorm develops will have the potential to produce 0.10”-0.25” total in 10-30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 900 PM Current TO 900 PM Jefferson County 1 Current TO 900 PM Current TO 900 PM Broomfield County 1 Current TO 900 PM Current TO 900 PM Douglas County 1 Current TO 900 PM Current TO 900 PM Adams County 1 Current TO 900 PM Current TO 900 PM Denver County 1 Current TO 900 PM Current TO 900 PM DIA 1 Current TO 900 PM Current TO 900 PM Arapahoe County 1 Current TO 900 PM Current TO 900 PM the City of Aurora 1 Current TO 900 PM Current TO 900 PM Arvada 1 Current TO 900 PM Current TO 900 PM Wheat Ridge 1 Current TO 900 PM Current TO 900 PM Lakewood 1 Current TO 900 PM Current TO 900 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains Adams Current TO 1159 PM SAT Trace (30%) to 0.1" (20%) to 0.25" (10%) NONE Arapahoe Current TO 1159 PM SAT Trace (30%) to 0.1" (20%) to 0.25" (10%) NONE Boulder Current TO 1159 PM SAT Trace (30%) to 0.1" (20%) to 0.25" (10%) NONE Broomfield Current TO 1159 PM SAT Trace (30%) to 0.1" (20%) to 0.25" (10%) NONE Denver Current TO 1159 PM SAT Trace (30%) to 0.1" (20%) to 0.25" (10%) NONE Douglas Current TO 1159 PM SAT Trace (30%) to 0.1" (20%) to 0.25" (10%) NONE Jefferson Current TO 1159 PM SAT Trace (30%) to 0.1" (20%) to 0.25" (10%) NONE Foothills above 6500ft Boulder Current TO 1159 PM SAT Trace (30%) to 0.1" (20%) to 0.25" (10%) NONE Douglas Current TO 1159 PM SAT Trace (30%) to 0.1" (20%) to 0.25" (10%) NONE Jefferson Current TO 1159 PM SAT Trace (30%) to 0.1" (20%) to 0.25" (10%) NONE MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789 F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]

3 months, 1 week

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Flash Flood Prediction Program

by f2p2＠udfcd.org

Time: 149 PM Sat July 27, 2024 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S HAVE BEEN ISSUED EFFECTIVEUNTIL 9:00 PM Storms have already started to impact portions of the foothills just outside of the District. The best chance for storm activity within the District will begin over the next hour with a chance for storms lasting into the evening hours. Storm motions will generally be west to east between 10-15mph, with some erratic storm motions likely from outflow boundaries. This will result in some storms having the potential to anchor in place with a threat for moderate to heavy rainfall. A quick 0.50”-0.80” in 10-30 minutes is expected rather than any long lasting rainfall. Storms today may also contain hail up to 1.0”, gusty winds up to 50mph and frequent cloud-to-ground lightning. A slight chance of showers lingers past sundown, although the threat of heavy rainfall will likely subside by 8-9pm this evening. Overnight temperatures will drop into the low 60s for the plains with mid to upper 50s along the foothills. STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce 0.05-0.30" total in 10-30 minutes. A moderate to strong thunderstorm will produce rainfall rates of 0.30”-0.80” total in 10- 30 minutes. WORST CASE SCENARIO: A slow-moving thunderstorm, training of thunderstorms cells or a large thunderstorm complex may result in up to 1.20” of rain in 30-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Boulder County 1 Current TO 900 PM Current TO 830 PM Jefferson County 1 Current TO 900 PM Current TO 830 PM Broomfield County 1 Current TO 900 PM Current TO 830 PM Douglas County 1 Current TO 900 PM Current TO 830 PM Adams County 1 Current TO 900 PM Current TO 830 PM Denver County 1 Current TO 900 PM Current TO 830 PM DIA 1 Current TO 900 PM Current TO 830 PM Arapahoe County 1 Current TO 900 PM Current TO 830 PM the City of Aurora 1 Current TO 900 PM Current TO 830 PM Arvada 1 Current TO 900 PM Current TO 830 PM Wheat Ridge 1 Current TO 900 PM Current TO 830 PM Lakewood 1 Current TO 900 PM Current TO 830 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains Adams Current TO 900 PM SAT 0.05" (60%) to 0.3" (30%) to 0.8" (15%) ISSUED Arapahoe Current TO 900 PM SAT 0.05" (60%) to 0.3" (30%) to 0.8" (15%) ISSUED Boulder Current TO 900 PM SAT 0.05" (60%) to 0.3" (30%) to 0.8" (15%) ISSUED Broomfield Current TO 900 PM SAT 0.05" (60%) to 0.3" (30%) to 0.8" (15%) ISSUED Denver Current TO 900 PM SAT 0.05" (60%) to 0.3" (30%) to 0.8" (15%) ISSUED Douglas Current TO 900 PM SAT 0.05" (60%) to 0.3" (30%) to 0.8" (15%) ISSUED Jefferson Current TO 900 PM SAT 0.05" (60%) to 0.3" (30%) to 0.8" (15%) ISSUED Foothills above 6500ft Boulder Current TO 900 PM SAT 0.05" (75%) to 0.3" (50%) to 0.8" (25%) ISSUED Douglas Current TO 900 PM SAT 0.05" (75%) to 0.3" (50%) to 0.8" (25%) ISSUED Jefferson Current TO 900 PM SAT 0.05" (75%) to 0.3" (50%) to 0.8" (25%) ISSUED MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789 F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]

3 months, 1 week

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Flash Flood Prediction Program

by f2p2＠udfcd.org

Time: 926 AM Sat July 27, 2024 Forecaster: Justin Brooks ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- Another chance for isolated afternoon and early evening showers and thunderstorms A minimal change to the upper-level flow aloft will keep chances for afternoon storm activity across portions of the District. Today’s high temperatures will reach the low 90s in the afternoon under partly cloudy skies. Showers and thunderstorms are expected to develop along the higher terrain foothills by midday with showers/thunderstorms moving into the District between 1-2pm. A few elevated dew points remain for northern portions of the District which will keep a chance for some brief moderate to heavy rainfall today. The largest threat today will be a quick 0.50” in 10-15 minutes rather than any long-lasting rainfall. Once again, general storm motions will be from west to east between 10-15mph with a few erratic storms possible forming along outflow boundaries. The best chance for storms within the District will be between 2-8pm with a few lingering showers possible after sunset with skies clearing out by midnight. Overnight will be mild and dry as temperatures drop into the low 60s on the plains with mid to upper 50s along the foothills. STORM RAINFALL POTENTIAL AND DURATION: Typical showers and thunderstorms will produce 0.05”-0.30” total in 10-30 minutes. A moderate to strong shower/thunderstorm will produce 0.30”-0.60” total in 10-30 minutes. WORST CASE SCENARIO: A strong stationary thunderstorm or training of thunderstorm cells will have the potential to produce 1.20” total in 30-60 minutes. A LOOK AHEAD: The heat returns tomorrow as high temperatures jump back into the mid to upper 90s. A slight chance for scattered high-based showers, mainly along the foothills in the afternoon and early evening with minimal, if any precipitation expected. Hot and dry Monday & Tuesday with highs in the upper 90s under sunny skies. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains Adams 200 PM TO 800 PM 0.05" (40%) to 0.3" (20%) to 0.6" (10%) LOW Arapahoe 200 PM TO 800 PM 0.05" (40%) to 0.3" (20%) to 0.6" (10%) LOW Boulder 200 PM TO 800 PM 0.05" (40%) to 0.3" (20%) to 0.6" (10%) LOW Broomfield 200 PM TO 800 PM 0.05" (40%) to 0.3" (20%) to 0.6" (10%) LOW Denver 200 PM TO 800 PM 0.05" (40%) to 0.3" (20%) to 0.6" (10%) LOW Douglas 200 PM TO 800 PM 0.05" (40%) to 0.3" (20%) to 0.6" (10%) LOW Jefferson 200 PM TO 800 PM 0.05" (40%) to 0.3" (20%) to 0.6" (10%) LOW Foothills above 6500ft Boulder 100 PM TO 700 PM 0.05" (60%) to 0.3" (30%) to 0.6" (15%) LOW Douglas 100 PM TO 700 PM 0.05" (60%) to 0.3" (30%) to 0.6" (15%) LOW Jefferson 100 PM TO 700 PM 0.05" (60%) to 0.3" (30%) to 0.6" (15%) LOW MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789 F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]

3 months, 1 week

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Flash Flood Prediction Program

by f2p2＠udfcd.org

Time: 918 PM Fri July 26, 2024 Forecaster: Aaron O'Brien ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S WILL BE ALLOWED TO EXPIRE AT 10:00 PM Message 1’s will be allowed to expire at 10pm as the threat of heavy rainfall has come to an end. After a round of showers and thunderstorms early in the afternoon, only a few isolated showers persist west of the District. These showers/thunderstorms should weaken and dissipate over the next several hours creating minimal concern over point rainfall amounts. Mild and dry conditions are expected overnight and into daybreak tomorrow. Temperatures will drop into the upper 50s for the plains with low 50s along the foothills. Tomorrow looks the same conditions-wise as the set up and moisture amounts haven't changed within the District, with afternoon and evening thunderstorms that can possibly provide Message level rain amounts. STORM RAINFALL POTENTIAL AND DURATION: Minimal additional precipitation is expected tonight between a trace and 0.15” total in 10-30 minutes. WORST CASE SCENARIO: A stronger shower/thunderstorm develops will have the potential to produce 0.15”-0.30” total in 10-30 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Wheat Ridge 1 Current TO 1000 PM Current TO 1000 PM Arvada 1 Current TO 1000 PM Current TO 1000 PM the City of Aurora 1 Current TO 1000 PM Current TO 1000 PM Arapahoe County 1 Current TO 1000 PM Current TO 1000 PM DIA 1 Current TO 1000 PM Current TO 1000 PM Denver County 1 Current TO 1000 PM Current TO 1000 PM Adams County 1 Current TO 1000 PM Current TO 1000 PM Douglas County 1 Current TO 1000 PM Current TO 1000 PM Broomfield County 1 Current TO 1000 PM Current TO 1000 PM Jefferson County 1 Current TO 1000 PM Current TO 1000 PM Boulder County 1 Current TO 1000 PM Current TO 1000 PM Lakewood 1 Current TO 1000 PM Current TO 1000 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains Adams Current TO 1159 PM FRI Trace (30%) to 0.15" (20%) to 0.3" (10%) NONE Arapahoe Current TO 1159 PM FRI Trace (30%) to 0.15" (20%) to 0.3" (10%) NONE Boulder Current TO 1159 PM FRI Trace (30%) to 0.15" (20%) to 0.3" (10%) NONE Broomfield Current TO 1159 PM FRI Trace (30%) to 0.15" (20%) to 0.3" (10%) NONE Denver Current TO 1159 PM FRI Trace (30%) to 0.15" (20%) to 0.3" (10%) NONE Douglas Current TO 1159 PM FRI Trace (30%) to 0.15" (20%) to 0.3" (10%) NONE Jefferson Current TO 1159 PM FRI Trace (30%) to 0.15" (20%) to 0.3" (10%) NONE Foothills above 6500ft Boulder Current TO 1159 PM FRI Trace (40%) to 0.15" (30%) to 0.3" (20%) NONE Douglas Current TO 1159 PM FRI Trace (40%) to 0.15" (30%) to 0.3" (20%) NONE Jefferson Current TO 1159 PM FRI Trace (40%) to 0.15" (30%) to 0.3" (20%) NONE MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789 F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]

3 months, 1 week

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Flash Flood Prediction Program

by f2p2＠udfcd.org

Time: 512 PM Fri July 26, 2024 Forecaster: Justin Brooks ------------------------- Internal Message Status Flash Flood Prediction Program ------------------------- MESSAGE 1’S WILL CONTINUE VALID UNTIL 10:00 PM A round of storms initiated along the foothills this afternoon bringing some moderate to brief heavy rainfall with 0.30”-0.75” total in 10-30 minutes for areas just west of the District. These storms produced a strong gust front that moved eastwardly through the District with gusts up to 35mph. This gust front pushed through the District and resulted in a strong line of storms east of the District. This line of storms will not move very much as storms pulse up along the gust. This line of storms could potentially produce an additional gust front which could move west and back into the District. This will result in a slight chance for storms to develop within the District, favoring eastern portions of the District at this time. This potential will keep Message 1’s valid until the evening as the threat of moderate to heavy rainfall remains. Storm intensities will decrease after sundown with a few off and on showers possible through midnight. STORM RAINFALL POTENTIAL AND DURATION: Typical showers and thunderstorms will produce 0.05”-0.30” total in 10-30 minutes. A moderate to strong shower/thunderstorm will produce 0.30”-0.80” total in 10-30 minutes. WORST CASE SCENARIO: A strong stationary thunderstorm or training of thunderstorm cells will have the potential to produce 1.20” total in 30-60 minutes. COUNTY MESSAGE VALID TIMES PRIME TIME Lakewood 1 Current TO 1000 PM Current TO 930 PM Wheat Ridge 1 Current TO 1000 PM Current TO 930 PM Arvada 1 Current TO 1000 PM Current TO 930 PM the City of Aurora 1 Current TO 1000 PM Current TO 930 PM Arapahoe County 1 Current TO 1000 PM Current TO 930 PM DIA 1 Current TO 1000 PM Current TO 930 PM Denver County 1 Current TO 1000 PM Current TO 930 PM Adams County 1 Current TO 1000 PM Current TO 930 PM Douglas County 1 Current TO 1000 PM Current TO 930 PM Broomfield County 1 Current TO 1000 PM Current TO 930 PM Jefferson County 1 Current TO 1000 PM Current TO 930 PM Boulder County 1 Current TO 1000 PM Current TO 930 PM County-specific Quantitative Precipitation Outlook PRECIPITATION TIME 30-Minute Rainfall and % Probability Message Potential Plains Adams Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (5%) ISSUED Arapahoe Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (5%) ISSUED Boulder Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (5%) ISSUED Broomfield Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (5%) ISSUED Denver Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (5%) ISSUED Douglas Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (5%) ISSUED Jefferson Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (5%) ISSUED Foothills above 6500ft Boulder Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (5%) ISSUED Douglas Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (5%) ISSUED Jefferson Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (5%) ISSUED MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789 F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]

3 months, 1 week

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Flash Flood Prediction Program

by f2p2＠udfcd.org

Time: 510 PM Fri July 26, 2024 Forecaster: Justin Brooks ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- MESSAGE 1’S WILL CONTINUE VALID UNTIL 10:00 PM A round of storms initiated along the foothills this afternoon bringing some moderate to brief heavy rainfall with 0.30”-0.75” total in 10-30 minutes. These storms produced a strong gust front that moved eastwardly through the District with gusts up to 35mph. This gust front pushed through the District and resulted in a strong line of storms east of the District. This line of storms will not move very much as storms pulse up along the gust. This line of storms could potentially produce an additional gust front which could move west and back into the District. This will result in a slight chance for storms to develop within the District, favoring eastern portions of the District at this time. This potential will keep Message 1’s valid until the evening as the threat of moderate to heavy rainfall remains. Storm intensities will decrease after sundown with a few off and on showers possible through midnight. STORM RAINFALL POTENTIAL AND DURATION: Typical showers and thunderstorms will produce 0.05”-0.30” total in 10-30 minutes. A moderate to strong shower/thunderstorm will produce 0.30”-0.80” total in 10-30 minutes. WORST CASE SCENARIO: A strong stationary thunderstorm or training of thunderstorm cells will have the potential to produce 1.20” total in 30-60 minutes. A LOOK AHEAD: Not much overall change in the upper-level pattern tomorrow will bring another chance for afternoon and evening showers/thunderstorms. Slightly less overall moisture aloft will decrease chances for moderate to heavy rainfall for the District tomorrow. Similar high temperatures in the low 90s. The heat returns Sunday with highs jumping back into the upper 90s. A slight chance for high-based showers, mainly along the foothills in the afternoon and early evening. Hot and dry Monday with highs in the upper 90s. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains Adams Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (10%) ISSUED Arapahoe Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (10%) ISSUED Boulder Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (10%) ISSUED Broomfield Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (10%) ISSUED Denver Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (10%) ISSUED Douglas Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (10%) ISSUED Jefferson Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (10%) ISSUED Foothills above 6500ft Boulder Current TO 1159 PM FRI 0.05" (30%) to 0.3" (20%) to 0.8" (10%) ISSUED Douglas Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (10%) ISSUED Jefferson Current TO 1159 PM FRI 0.05" (40%) to 0.3" (20%) to 0.8" (10%) ISSUED MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS. MHFD Flood Prediction Center: 303-458-0789 F2P2 Website [http://udfcd.org/Flash+Flood+Prediction+Program]

3 months, 1 week

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