Flash Flood Prediction Program
by f2p2@udfcd.org
Time: 130 AM Fri August 13, 2021
Forecaster: Brad Simmons
-------------------------
Internal Message Status
Flash Flood Prediction Program
-------------------------
MESSAGE 1'S WILL BE ALLOWED TO EXPIRE
-
Message 1's will be allowed to expire at 3:00am as the threat for
heavy rainfall has ended.
-
Thunderstorm activity diminished about an hour ago with generally
dry conditions expected for the remainder of the evening and overnight
period.
-
Thunderstorm chances increase area wide on Friday afternoon with
widely scattered afternoon/evening thunderstorm coverage with slower
moving storms capable of producing heavy rainfall that may lead to
excessive runoff and possibly flash flooding.
STORM RAINFALL POTENTIAL AND DURATION: No meaningful precipitation
expected for the remainder of the overnight period.
COUNTY
MESSAGE
VALID TIMES
PRIME TIME
Jefferson County
1
Current TO 300 AM
1100 PM TO 200 AM FRIDAY
Douglas County
1
Current TO 300 AM
1100 PM TO 200 AM FRIDAY
Adams County
1
Current TO 300 AM
1100 PM TO 200 AM FRIDAY
Denver County
1
Current TO 300 AM
1100 PM TO 200 AM FRIDAY
DIA
1
Current TO 300 AM
1100 PM TO 200 AM FRIDAY
Arapahoe County
1
Current TO 300 AM
1100 PM TO 200 AM FRIDAY
the City of Aurora
1
Current TO 300 AM
1100 PM TO 200 AM FRIDAY
Arvada
1
Current TO 300 AM
1100 PM TO 200 AM FRIDAY
Wheat Ridge
1
Current TO 300 AM
1100 PM TO 200 AM FRIDAY
Lakewood
1
Current TO 300 AM
1100 PM TO 200 AM FRIDAY
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
MHFD Flood Prediction Center: 303-458-0789 Â Â Â F2P2 Website
[http://udfcd.org/Flash+Flood+Prediction+Program]
3 years, 4 months
Flash Flood Prediction Program
by f2p2@udfcd.org
Time: 1041 PM Thu August 12, 2021
Forecaster: Brad Simmons
-------------------------
Internal Message Status
Flash Flood Prediction Program
-------------------------
MESSAGE 1'S ISSUED FOR PORTIONS OF THE DISTRICT
-
Message 1's have been issued for all areas of the District EXCEPT
Boulder and Broomfield Counties at this time. Boulder and Broomfield
Counties may be included over the next hour.
-
An outflow boundary has moved into the District and is beginning to
initiate thunderstorm development along the I-25 corridor S of I-70
currently. These storms are expected to become stronger and will have
the potential to produce heavy rainfall this evening and overnight.
-
Best chances for thunderstorm activity will be along and E of the
I-25 corridor where moisture is deeper with a lesser chance for strong
storms further W, but conditions may evolve. Best chances for
thunderstorms will be until about 2am Friday morning. Should
thunderstorm activity linger through 3am, Message 1's may need to be
extended.
STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms
will produce rainfall rates of 0.2-0.5" in 10-30 minutes. Strong
thunderstorms will have the potential to produce heavy rainfall of
0.5-1.5" in 10-30 minutes.
WORST CASE SCENARIO: A nearly stationary strong thunderstorm may
result in up to 2.5" of heavy rain in 45-60 minutes.
COUNTY
MESSAGE
VALID TIMES
PRIME TIME
Jefferson County
1
Current TO 300 AM FRIDAY
1100 PM TO 200 AM FRIDAY
Douglas County
1
Current TO 300 AM FRIDAY
1100 PM TO 200 AM FRIDAY
Adams County
1
Current TO 300 AM FRIDAY
1100 PM TO 200 AM FRIDAY
Denver County
1
Current TO 300 AM FRIDAY
1100 PM TO 200 AM FRIDAY
DIA
1
Current TO 300 AM FRIDAY
1100 PM TO 200 AM FRIDAY
Arapahoe County
1
Current TO 300 AM FRIDAY
1100 PM TO 200 AM FRIDAY
the City of Aurora
1
Current TO 300 AM FRIDAY
1100 PM TO 200 AM FRIDAY
Arvada
1
Current TO 300 AM FRIDAY
1100 PM TO 200 AM FRIDAY
Wheat Ridge
1
Current TO 300 AM FRIDAY
1100 PM TO 200 AM FRIDAY
Lakewood
1
Current TO 300 AM FRIDAY
1100 PM TO 200 AM FRIDAY
County-specific Quantitative
Precipitation Outlook PRECIPITATION TIME
30-Minute Rainfall
and % Probability Message
Potential
Plains
Â
Â
Â
Adams
Current TO 300 AM FRI
0.2" (90%) to 0.5" (60%) to 1.5" (30%)
ISSUED
Arapahoe
Current TO 300 AM FRI
0.2" (100%) to 0.5" (80%) to 1.5" (40%)
ISSUED
Boulder
Current TO 300 AM FRI
0.2" (90%) to 0.5" (60%) to 1.5" (30%)
HIGH
Broomfield
Current TO 300 AM FRI
0.2" (90%) to 0.5" (60%) to 1.5" (30%)
HIGH
Denver
Current TO 300 AM FRI
0.2" (100%) to 0.5" (80%) to 1.5" (40%)
ISSUED
Douglas
Current TO 300 AM FRI
0.2" (100%) to 0.5" (80%) to 1.5" (40%)
ISSUED
Jefferson
Current TO 300 AM FRI
0.2" (90%) to 0.5" (60%) to 1.5" (30%)
ISSUED
Foothills above 6500ft
Â
Â
Â
Boulder
Current TO 300 AM FRI
0.2" (60%) to 0.5" (40%) to 1.5" (20%)
HIGH
Douglas
Current TO 300 AM FRI
0.2" (100%) to 0.5" (80%) to 1.5" (40%)
ISSUED
Jefferson
Current TO 300 AM FRI
0.2" (80%) to 0.5" (50%) to 1.5" (25%)
ISSUED
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
MHFD Flood Prediction Center: 303-458-0789 Â Â Â F2P2 Website
[http://udfcd.org/Flash+Flood+Prediction+Program]
3 years, 4 months
Flash Flood Prediction Program
by f2p2@udfcd.org
Time: 630 PM Thu August 12, 2021
Forecaster: Brad Simmons
-------------------------
Heavy Precipitation Outlook
Flash Flood Prediction Program
-------------------------
THUNDERSTORM CHANCES ON THE INCREASE THIS EVENING/HEAVY RAINFALL
POSSIBLE
-
Surface moisture has slowly increased through the afternoon with dew
points currently in the low to mid 50's along and E of I-25. Outflow
from thunderstorm activity to the SE is pushing back towards the
District at this time and may trigger thunderstorm development this
evening. There is a chance this boundary moves through and minimal if
any development occurs but if a storm is able to develop heavy
rainfall is a good bet.
-
With the increase in surface moisture potential rainfall amounts
have also increased from this morning's HPO. Stronger thunderstorms,
should they develop this evening will be capable of producing brief
periods of heavy rain that may lead to excessive runoff and possibly
flash flooding.
-
Best chances for thunderstorm activity will be over the plains where
moisture is deeper with a lesser chance for strong storms over the
foothills. Best chances for thunderstorms overall appears to be from
roughly 10pm this evening until about 2am Friday morning.
STORM RAINFALL POTENTIAL AND DURATION: Weak to moderate thunderstorms
will produce rainfall rates of 0.2-0.5" in 10-30 minutes. Strong
thunderstorms will have the potential to produce heavy rainfall of
0.5-1.5" in 10-30 minutes.
WORST CASE SCENARIO: A nearly stationary strong thunderstorm may
result in up to 2.5" of heavy rain in 45-60 minutes.
A LOOK AHEAD: Thunderstorm chances increase area wide on Friday with
widely scattered to scattered afternoon thunderstorm coverage in the
afternoon/evening with slower moving strong storms capable of
producing heavy rainfall that may lead to excessive runoff and
possibly flash flooding.
LOCATION
PRIME TIME
30-Minute Rainfall
and % Probability Message
Potential
Plains
Â
Â
Â
Adams
Current TO 200 AM FRI
0.2" (60%) to 0.5" (30%) to 1.5" (15%)
MOD
Arapahoe
Current TO 200 AM FRI
0.2" (60%) to 0.5" (30%) to 1.5" (15%)
MOD
Boulder
Current TO 200 AM FRI
0.2" (50%) to 0.5" (25%) to 1.5" (10%)
LOW
Broomfield
Current TO 200 AM FRI
0.2" (60%) to 0.5" (30%) to 1.5" (15%)
MOD
Denver
Current TO 200 AM FRI
0.2" (60%) to 0.5" (30%) to 1.5" (15%)
MOD
Douglas
Current TO 200 AM FRI
0.2" (60%) to 0.5" (30%) to 1.5" (15%)
MOD
Jefferson
Current TO 200 AM FRI
0.2" (50%) to 0.5" (25%) to 1.5" (10%)
LOW
Foothills above 6500ft
Â
Â
Â
Boulder
Current TO 200 AM FRI
0.2" (40%) to 0.5" (20%) to 1.5" (10%)
LOW
Douglas
Current TO 200 AM FRI
0.2" (40%) to 0.5" (20%) to 1.5" (10%)
LOW
Jefferson
Current TO 200 AM FRI
0.2" (40%) to 0.5" (20%) to 1.5" (10%)
LOW
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
MHFD Flood Prediction Center: 303-458-0789 Â Â Â F2P2 Website
[http://udfcd.org/Flash+Flood+Prediction+Program]
3 years, 4 months
Flash Flood Prediction Program
by f2p2@udfcd.org
Time: 937 AM Thu August 12, 2021
Forecaster: Brad Simmons
-------------------------
Heavy Precipitation Outlook
Flash Flood Prediction Program
-------------------------
COOLER WITH CONTINUED HAZE AND A SLIGHT CHANCE FOR LATE
AFTERNOON/EVENING SHOWERS/ISOLATED THUNDERSTORMS
-
The District will experience cooler temperatures today with highs in
the upper 80âs over the plains with 70's in the Front Range
foothills as a cold front moved through this morning. The haze will
continue today but gradual improvement is expected into tomorrow.
-
Moisture will slowly be on the increase and may result in a few
isolated rain showers or weak thunderstorms late this afternoon and
evening. There is even a hint that some shower activity may develop
over the plains around midnight tonight and linger for a few hours
into Friday morning?
-
Foothill and Palmer Divide locations will have the better chances to
experience an isolated high-based shower or weak to moderate
thunderstorm today. Generally dry conditions are expected over the
majority of the District forecast area until later this evening and
there is uncertainty as to whether or not any showers/thunderstorms
will come to fruition tonight. Best chances for isolated thunderstorm
activity this afternoon over the foothills and Palmer Divide will be
from 4-8pm, and over the plains from roughly 8pm this evening until
2am Friday.
STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak
thunderstorms will produce a trace to 0.1". Moderate thunderstorms
will have the potential to produce rainfall rates of 0.1-0.4" in 10-30
minutes.
WORST CASE SCENARIO: A slow moving strong thunderstorm may result in
heavy rainfall of 0.4-1.2" in 15-45 minutes.
A LOOK AHEAD: A bit of monsoon moisture will return to the District on
Friday and increase the chances for thunderstorms area wide. Widely
scattered to scattered afternoon thunderstorm coverage is expected
with slower moving strong storms capable of producing heavy rainfall
that may lead to excessive runoff and possibly flash flooding.
Temperatures will continue to run in the 80's for highs over the
plains with an improvement in the haze likely.
LOCATION
PRIME TIME
30-Minute Rainfall
and % Probability Message
Potential
Plains
Â
Â
Â
Adams
800 PM TO 200 AM FRI
Trace (40%) to 0.1" (20%) to 0.4" (10%)
NONE
Broomfield
800 PM TO 200 AM FRI
Trace (40%) to 0.1" (20%) to 0.4" (10%)
NONE
Denver
800 PM TO 200 AM FRI
Trace (40%) to 0.1" (20%) to 0.4" (10%)
NONE
Arapahoe
600 PM TO 200 AM FRI
Trace (60%) to 0.1" (30%) to 0.4" (15%)
NONE
Boulder
600 PM TO 200 AM FRI
Trace (40%) to 0.1" (20%) to 0.4" (10%)
NONE
Douglas
600 PM TO 200 AM FRI
Trace (60%) to 0.1" (30%) to 0.4" (15%)
NONE
Jefferson
600 PM TO 200 AM FRI
Trace (40%) to 0.1" (20%) to 0.4" (10%)
NONE
Foothills above 6500ft
Â
Â
Â
Boulder
400 PM TO 200 AM FRI
Trace (75%) to 0.1" (50%) to 0.4" (20%)
NONE
Douglas
400 PM TO 200 AM FRI
Trace (75%) to 0.1" (50%) to 0.4" (20%)
NONE
Jefferson
400 PM TO 200 AM FRI
Trace (75%) to 0.1" (50%) to 0.4" (20%)
NONE
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
MHFD Flood Prediction Center: 303-458-0789 Â Â Â F2P2 Website
[http://udfcd.org/Flash+Flood+Prediction+Program]
3 years, 4 months
Flash Flood Prediction Program
by f2p2@udfcd.org
Time: 857 AM Wed August 11, 2021
Forecaster: Brad Simmons
-------------------------
Heavy Precipitation Outlook
Flash Flood Prediction Program
-------------------------
CONTINUED HAZY, HOT AND DRY
-
Haze will continue to be a factor today but some improvement is
expected over the coming days... Conditions will be dry under sunny to
mostly sunny skies. Any shower or thunderstorm activity today is
expected to remain well to the SW of the District.
-
Highs this afternoon will peak in the low to mid 90's over the
plains and we could tie the record high at DIA. Normal high for Denver
today is 88 degrees and the record high is 97 set just last year.
STORM RAINFALL POTENTIAL AND DURATION: No precipitation today or
tonight.
A LOOK AHEAD: On Thursday moisture will slowly be on the increase
leading to a chance for isolated afternoon and evening thunderstorms.
Showers and generally weak to moderate thunderstorms will favor the
higher terrain and Palmer Divide. Heavy rainfall is not expected.
Temperatures Thursday will back off into the upper 80's to lower 90's
over the plains, mainly due to more cloud cover earlier in the day. A
little cooler for Friday with temperatures remaining in the 80's for
highs over the plains. There will be a much better chance for
scattered afternoon/evening thunderstorms over the District with some
storms producing a much needed wetting rain. Heavy rainfall threat
Friday appears low at this time.
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
MHFD Flood Prediction Center: 303-458-0789 Â Â Â F2P2 Website
[http://udfcd.org/Flash+Flood+Prediction+Program]
3 years, 4 months
Flash Flood Prediction Program
by f2p2@udfcd.org
Time: 948 AM Tue August 10, 2021
Forecaster: Brad Simmons
-------------------------
Heavy Precipitation Outlook
Flash Flood Prediction Program
-------------------------
HAZE EXPECTED TO WORSEN AS THE DAY WEARS ON WITH GENERALLY DRY
CONDITIONS
-
A cool front made its way across the District last night, displacing
some of the surface smoke and briefly improving air quality conditions
this morning. Under westerly flow aloft, another smoke plume has
started to spill over the Front Range and into the I-25 corridor. Hazy
conditions are expected to worsen throughout today and into the
evening hours.
-
Behind the front temperatures will be cooler than yesterday but
still above seasonal averages in the lower 90's over the plains with
70's and 80's in the Front Range foothills. Normal high for Denver
today is 89 degrees.
-
Dry conditions are expected to prevail but an isolated high-based
shower or weak thunderstorm cannot be completely ruled out this
afternoon between 3-8pm. No meaningful precipitation expected, less
than 0.10" with gusty winds and possibly a sprinkle being the most
likely outcome.
STORM RAINFALL POTENTIAL AND DURATION: No meaningful precipitation
expected today or tonight, less than 0.10" from high-based
showers/weak thunderstorms.
A LOOK AHEAD: Another hot, dry and hazy day on Wednesday then chances
for thunderstorms return to the District on Thursday/Friday and
continue through the upcoming weekend. Heavy rainfall is not expected
from thunderstorm activity at this time.
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
MHFD Flood Prediction Center: 303-458-0789 Â Â Â F2P2 Website
[http://udfcd.org/Flash+Flood+Prediction+Program]
3 years, 4 months
Flash Flood Prediction Program
by f2p2@udfcd.org
Time: 915 AM Mon August 9, 2021
Forecaster: Justin Brooks
-------------------------
Heavy Precipitation Outlook
Flash Flood Prediction Program
-------------------------
ANOTHER HOT, HAZY AND DRY DAY TODAY
-
Not much overall change to the pattern today other than a bit hotter
today as highs are expected to reach the low to mid 90's on the plains
this afternoon with upper 80's to around 90 degrees for the foothills.
-
Hazy skies will persist today with mostly sunny skies in the morning
as clouds increase into the afternoon. A few rain showers/isolated
thunderstorms are possible well out on the eastern plains with hazy
and dry conditions expected to continue for the District throughout
the day and into this evening.
-
Overnight will be mild as lows drop into the 60's for the plains
with mid to upper 50's along the foothills.
STORM RAINFALL POTENTIAL AND DURATION: No precipitation is expected
today or this evening.
A LOOK AHEAD: Similar conditions persist through the week as
temperatures remain in the low to mid 90's with hazy and dry
conditions through Thursday. A change in the weather pattern in
expected Friday which could both bring some rain to the region and
usher out some haze with brief SW flow aloft throughout the day.
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
MHFD Flood Prediction Center: 303-458-0789 Â Â Â F2P2 Website
[http://udfcd.org/Flash+Flood+Prediction+Program]
3 years, 4 months
Flash Flood Prediction Program
by f2p2@udfcd.org
Time: 851 AM Sun August 8, 2021
Forecaster: Justin Brooks
-------------------------
Heavy Precipitation Outlook
Flash Flood Prediction Program
-------------------------
ANOTHER HOT, HAZY AND DRY DAY TODAY
-
Wildfire smoke continues to push into the region from the west today
resulting in continued hazy skies throughout the day and into this
evening.
-
High-pressure starts to build over the region bringing high
temperatures back into the upper 80's to low 90's on the plains with
mid to upper 80's along the foothills. Mild conditions are expected
today and this evening with mostly sunny skies throughout the day.
-
Overnight lows drop into the low to mid 60's for the plains with mid
to upper 50's along the foothills.
STORM RAINFALL POTENTIAL AND DURATION: No precipitation is expected
today or this evening.
A LOOK AHEAD: Hot and dry conditions continue through the week. A
little break from hazy skies possible tomorrow, however, another plume
of smoke is already heading towards us from the Nevada region and will
likely effect us Tuesday and Wednesday increasing hazy conditions once
again. Temperatures this week will remain in the 90's on the plains
for the most part with mid to upper 80's along the foothills.
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
MHFD Flood Prediction Center: 303-458-0789 Â Â Â F2P2 Website
[http://udfcd.org/Flash+Flood+Prediction+Program]
3 years, 4 months
Flash Flood Prediction Program
by f2p2@udfcd.org
Time: 802 AM Sat August 7, 2021
Forecaster: Justin Brooks
-------------------------
Heavy Precipitation Outlook
Flash Flood Prediction Program
-------------------------
SLIGHTY COOLER, HAZY AND DRY TODAY
-
Cooler today as high temperatures only reach the low to mid 80's on
the plains with mid to upper 70's along the foothills.
-
Dry conditions are expected throughout the day today and this
evening. Wildfire smoke from the western states will be on the
increase today leading to elevated hazy conditions for all of Colorado
through the entire weekend and well into next week.
-
Overnight will be mild with continued hazy and dry conditions as
temperatures dip into the low to mid 60's for the plains with mid to
upper 50's along the foothills just before daybreak Sunday.
STORM RAINFALL POTENTIAL AND DURATION: No precipitation is expected
today or this evening.
A LOOK AHEAD: High-pressure starts to build Sunday leading to warmer
daytime highs into the 90's for the plains with mid to upper 80's for
the foothills with continued hazy skies. Similar conditions into the
beginning of next week with highs in the 90's with hazy skies and dry
conditions Monday and Tuesday.
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
MHFD Flood Prediction Center: 303-458-0789 Â Â Â F2P2 Website
[http://udfcd.org/Flash+Flood+Prediction+Program]
3 years, 4 months
Flash Flood Prediction Program
by f2p2@udfcd.org
Time: 825 AM Fri August 6, 2021
Forecaster: Justin Brooks
-------------------------
Heavy Precipitation Outlook
Flash Flood Prediction Program
-------------------------
HOT AND HAZY WITH A SLIGHT CHANCE FOR ISOLATED AFTERNOON/EVE
HIGH-BASED RAIN SHOWERS/THUNDERSTORMS
-
Not much change in the overall pattern today will lead to continued
hazy skies along with high temperatures in the low to mid 90's on the
plains with upper 80's to around 90 for the foothills.
-
A slight chance this afternoon for scattered high-based rain
showers/isolated thunderstorms. Storms will initiate along the higher
terrain around midday with the best chance for storms in the District
between 2-8pm with a few lingering rain showers possible into the
later evening. Dew points should mix out through the morning leading
to drier surface conditions into this afternoon. this will likely
result in high-based rain showers/isolated thunderstorms with minimal
rainfall expected, however, there is a very slight chance dew points
remain in place leading to a better chance for stronger storms this
afternoon and evening.
-
Through the overnight, skies will gradually clear with mild
conditions into Saturday. Overnight lows will drop into the low to mid
60's for the plains with mid to upper 50's along the foothills.
STORM RAINFALL POTENTIAL AND DURATION: Typical rain showers/isolated
thunderstorms will produce a TR-0.2" of rainfall in 10-30 minutes. a
moderate thunderstorm could produce 0.2-0.4" in 10-30 minutes.
WORST CASE SCENARIO: A strong, nearly stationary storm formed along an
outflow boundary has the potential to produce 0.4-1.2" in 60 minutes.
A LOOK AHEAD: Hot and hazy conditions continue into the weekend with
dry conditions expected both Saturday and Sunday. This pattern hold
into next week with dry conditions expected both Monday and Tuesday
along with continued hazy skies.
LOCATION
PRIME TIME
30-Minute Rainfall
and % Probability Message
Potential
Plains
Â
Â
Â
Adams
200 PM TO 800 PM
Trace (40%) to 0.2" (20%) to 0.4" (10%)
NONE
Arapahoe
200 PM TO 800 PM
Trace (40%) to 0.2" (20%) to 0.4" (10%)
NONE
Boulder
200 PM TO 800 PM
Trace (40%) to 0.2" (20%) to 0.4" (10%)
NONE
Broomfield
200 PM TO 800 PM
Trace (40%) to 0.2" (20%) to 0.4" (10%)
NONE
Denver
200 PM TO 800 PM
Trace (40%) to 0.2" (20%) to 0.4" (10%)
NONE
Douglas
200 PM TO 800 PM
Trace (40%) to 0.2" (20%) to 0.4" (10%)
NONE
Jefferson
200 PM TO 800 PM
Trace (40%) to 0.2" (20%) to 0.4" (10%)
NONE
Foothills above 6500ft
Â
Â
Â
Boulder
200 PM TO 800 PM
Trace (50%) to 0.2" (25%) to 0.4" (10%)
NONE
Douglas
200 PM TO 800 PM
Trace (50%) to 0.2" (25%) to 0.4" (10%)
NONE
Jefferson
200 PM TO 800 PM
Trace (50%) to 0.2" (25%) to 0.4" (10%)
NONE
MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.
MHFD Flood Prediction Center: 303-458-0789 Â Â Â F2P2 Website
[http://udfcd.org/Flash+Flood+Prediction+Program]
3 years, 4 months