PLEASE REFRESH PERIODICALLY FOR THE MOST CURRENT INFORMATION.
The Boulder Office of Emergency Management in collaboration with the City of Boulder Police & Fire Dispatch Center and the Boulder County Sheriff’s Communications Center are testing the outdoor warning siren system today at 10 a.m. and again at 7 p.m. The test is held on the first Monday of each month from April to August. The sirens are used to warn residents of a flood, tornado or wildfire. Today there is light rain and overcast skies in the Boulder area and no risk of flooding. The National Weather Service does not have an active weather advisory, watch or warning in place for Boulder County at this time.
The severe weather threat for Boulder County has passed and only very light rain showers are in the forecast for the rest of the night. Boulder OEM is no longer monitoring weather.
Light Storm development has increased over Eastern Boulder County delivering 4/10 ths of rain per hour. No risk at this time and the storm action appears to be moving to the south and building to the East. The storm could be over Lafayette and Louisville within 45-60 minutes. Boulder OEM will continue to monitor storm development. The severe weather impacts remain south of the Boulder County with flash flood warnings just issued for Evergreen in Jefferson County and also Elbert County.
The storm activity currently is isolated to the northern foothills around Lyons and producing .04/10 of an inch which is very light. Storm development to the west and south of Boulder County is light to non-existent at this time. Light storm development is still north of the county but it appears that the high threat period for storm activity has passed but light rain is expected throughout the County over night. Boulder OEM will continue to monitor over the next four hours to make sure that any developing threats are monitored. If storm activity remains light in nature severe weather monitoring will stop at 2 a.m.
Currently the heaviest rainfall is occurring on the plains over west Longmont, Hygiene and in the foothills around Lefthand Canyon at a rate of around 1/2 inch per hour. All creeks and rivers are holding with in acceptable flows. No reports of flooding due to river or creeks flowing out of their banks. The storm is slow moving building back towards the foothills and into the Fourmile area and should not exceed 1/2 per hour in these areas. It is expected to rain lightly throughout the night after midnight and the strongest storm activity is over the eastern part of the state. Rain should increase over North Boulder, Niwot and Louisville over the next hour. Boulder Emergency Management will continue to monitor the situation and update as needed.