Time: 239 PM Thu May 14, 2020 Forecaster: Brad Simmons

Flash Flood Prediction Program


We have determined that street and small stream flooding is possible in the following counties: Boulder (City of Boulder affected, Four Mile Burn Area affected), Jefferson, Broomfield, Douglas, Adams, Denver, Arapahoe
including: DIA, the City of Aurora, Arvada, Wheat Ridge, Lakewood
from: Current to 900 PM.
Prime time for flooding: 300 PM to 800 PM.
Forecast rainfall: Moderate and strong thunderstorms will produce rainfall of 0.3-0.7" in 10-30 minutes. A slower moving strong thunderstorm or training of thunderstorm cells may result in up to 1.4" of rainfall in 30-60 minutes.
The most likely areas to be impacted by flooding are:

X Urban streams/gulches; road crossings; recreational trails; adjacent open space areas/campgrounds/parks; floodplain properties; utilities

X Urban streets, intersections, low lying areas, known trouble spots

Additional Information: Strong thunderstorms may also produce frequent cloud-to-ground lightning, gusty straight-line winds and large hail.

This message is not intended for public dissemination. Please pass this information along to affected emergency response organizations (police, fire, public works, etc.) within your area.

Also, please take appropriate actions to prepare for possible flooding.

Further information will be provided to you as it becomes available.