Flash Flood Prediction Program

Explosive storm development has persisted for areas east of I-25 and will continue over the next hour or so. These rapidly developing storms have contained lots of hail, heavy rain, and frequent cloud-to-ground lightning. Storm movement has been relatively fast, between 20-30mph, however a few storms have stalled out east and could continue to slow as they move out of the District. Storms should weaken as the sun sets as they continue to move eastward. The threat of heavy rainfall will likely diminish after 9pm with skies gradually clearing overnight.

STORM RAINFALL POTENTIAL AND DURATION: Typical showers will produce rainfall of a T-0.25” total in 10-30 minutes. Moderate to strong showers have the potential to produce rainfall of 0.25” to 0.50” total in 10-30 minutes.

WORST CASE SCENARIO: Strong stationary, or training of thunderstorms has the potential to produce 1.00” in under 60 minutes.

County	Message	Valid Times	Prime Time
Adams 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

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	Current TO 900 PM MON	0.25" (60%) to 0.5" (30%) to 1" (10%)	ISSUED
Arapahoe	Current TO 900 PM MON	0.25" (60%) to 0.5" (30%) to 1" (10%)	ISSUED
Denver	Current TO 900 PM MON	0.25" (60%) to 0.5" (30%) to 1" (10%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.