Time: 937 AM Mon May 23, 2022 Forecaster: Brad Simmons ------------------------- Heavy Precipitation Outlook Flash Flood Prediction Program ------------------------- CONTINUED COOL WITH ISOLATED SHOWERS AND THUNDERSTORMS POSSIBLE DAYTIME/ADDITIONAL RAIN SHOWERS LIKELY OVERNIGHT - Trough of low pressure continues to be draped across the state of Colorado keeping our weather pattern relatively active today and tomorrow. Temperatures will continue to run below seasonal averages with highs this afternoon reaching the low to mid 60's over the plains with 40's and 50's in the Front Range foothills. Normal high for Denver today is 74 degrees. - Light rain showers are currently impacting portions of Boulder County this morning and these showers are expected to weaken as they move southward but there will be a modest chance for a few rain showers through noon over the District. This afternoon a few additional rain showers and isolated thunderstorms are expected to develop but best chances will remain S and E of the District. Overall there will be a modest chance for precipitation District wide today but amounts look to remain minimal. - Overnight a low pressure system will pass to the S and rain shower activity is expected to push northward with best chances for meaningful rain remaining S of I-70. Lesser chances for rainfall overnight over the northern areas of the District. Foothill locations will be cold enough to support "wet" snow overnight, mainly above 8,000ft with minor accumulations of less than 1". STORM RAINFALL POTENTIAL AND DURATION: Rain showers will produce a trace to 0.10" in 10-30 minutes. Weak thunderstorms will have the potential to produce 0.1-0.3" in 10-30 minutes. WORST CASE SCENARIO: A moderate to strong thunderstorm is able to develop with potential to produce rainfall rates of 0.2-0.6" in 10-30 minutes. A LOOK AHEAD: Likely cloudy and cool with some light rain shower activity over parts of the District early Tuesday morning. Highs Tuesday afternoon will be cooler than today, possibly having trouble making it out of the 50's over the plains due to thicker cloud cover. Best chances for showers Tuesday afternoon and evening will favor southern areas of the District with conditions drying out Tuesday evening. LOCATION PRIME TIME 30-Minute Rainfall and % Probability Message Potential Plains       Adams Current TO 1159 PM MON Trace (80%) to 0.1" (60%) to 0.3" (20%) NONE Arapahoe Current TO 1159 PM MON Trace (80%) to 0.1" (60%) to 0.3" (20%) NONE Boulder Current TO 1159 PM MON Trace (85%) to 0.1" (65%) to 0.3" (20%) NONE Broomfield Current TO 1159 PM MON Trace (80%) to 0.1" (60%) to 0.3" (20%) NONE Denver Current TO 1159 PM MON Trace (80%) to 0.1" (60%) to 0.3" (20%) NONE Douglas Current TO 1159 PM MON Trace (85%) to 0.1" (65%) to 0.3" (20%) NONE Jefferson Current TO 1159 PM MON Trace (85%) to 0.1" (65%) to 0.3" (20%) NONE Foothills above 6500ft       Boulder Current TO 1159 PM MON Trace (90%) to 0.1" (65%) to 0.3" (20%) NONE Douglas Current TO 1159 PM MON Trace (85%) to 0.1" (65%) to 0.3" (20%) NONE Jefferson Current TO 1159 PM MON Trace (85%) to 0.1" (65%) 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]