Flash Flood Prediction Program

-	Very little change in the overall pattern from yesterday resulting in another chance for afternoon rain showers/isolated thunderstorms. High temperatures today will be in the low to mid 90's across the plains with low to mid 80's along the foothills with dew points dropping into the low to mid 40's across the plains.
-	The first round of storms will initiate over the higher terrain around midday and will move out onto the plains between 2-4pm. An additional weak round of rain showers/isolated thunderstorms will be possible through sunset. Rain showers/isolated thunderstorms should move relatively quickly today from the W/NW to E/SE between 10-20mph which will help limit point rainfall amounts. Although a slower moving storm formed off an outflow boundary cannot be completely ruled out leading to a better chance for isolated heavy rainfall. Strong thunderstorms may also produce hail, gusty straight-line winds and frequent lightning.
-	Shower and thunderstorm activity is expected to decrease by sunset although additional isolated rain showers and possibly a weak thunderstorm will remain possible until 9-10pm. Overnight lows will drop into the low to mid 60's on the plains with mid to upper 50's along the foothills.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak to moderate thunderstorms will produce a trace to 0.2". Moderate to strong thunderstorms will have the potential to produce 0.2-0.7" in 10-30 mintues. Supplemental QPF is available at https://qpf.udfcd.org

WORST CASE SCENARIO: A large slower moving thunderstorm formed off an outflow boundary may produce rainfall amounts of up to 1.4" in 45-60 minutes.

A LOOK AHEAD: A cold front moves in overnight dropping high temperatures back into the more seasonable 80's across the plains. An increase in moisture will move into the region Friday resulting in a good chance for widespread rain showers/thunderstorms during the afternoon and evening with lingering rain showers possible through the overnight and into Saturday. Similar conditions Saturday with a chance for rain/isolated thunderstorms during the day, with a better chance for rain/thunderstorms during the afternoon and evening.

Location	Prime Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	200 PM TO 800 PM	Trace (50%) to 0.2" (30%) to 0.7" (10%)	LOW
Arapahoe	200 PM TO 800 PM	Trace (50%) to 0.2" (30%) to 0.7" (10%)	LOW
Boulder	200 PM TO 800 PM	Trace (50%) to 0.2" (30%) to 0.7" (10%)	LOW
Broomfield	200 PM TO 800 PM	Trace (50%) to 0.2" (30%) to 0.7" (10%)	LOW
Denver	200 PM TO 800 PM	Trace (50%) to 0.2" (30%) to 0.7" (10%)	LOW
Douglas	200 PM TO 800 PM	Trace (50%) to 0.2" (30%) to 0.7" (10%)	LOW
Jefferson	200 PM TO 800 PM	Trace (50%) to 0.2" (30%) to 0.7" (10%)	LOW
Foothills above 6500ft
Boulder	200 PM TO 800 PM	Trace (50%) to 0.2" (30%) to 0.7" (10%)	LOW
Douglas	200 PM TO 800 PM	Trace (50%) to 0.2" (30%) to 0.7" (10%)	LOW
Jefferson	200 PM TO 800 PM	Trace (50%) to 0.2" (30%) to 0.7" (10%)	LOW

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.