Alert archive / Colorado / Winter Storm Warnings in 2023
Winter Storm Warning 11, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this winter storm warning at Apr 24, 2023, 1:45 PM MDT for 12 counties in Colorado. It took effect at Apr 25, 2023, 12:00 PM MDT. It was in force for 17 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 24, 2023, 1:45 PM MDT (19:45 UTC)
- In effect from
- Apr 25, 2023, 12:00 PM MDT
- Expired
- Apr 26, 2023, 4:53 AM MDT
- In force
- 17 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Arapahoe County, CO, Boulder County, CO, Clear Creek County, CO, Douglas County, CO, Elbert County, CO, Gilpin County, CO, Grand County, CO, Jackson County, CO, Jefferson County, CO, Larimer County, CO, Park County, CO, Summit County, CO
The radar
The Denver radar (KFTG), 74 km from the middle of the area, began a volume at 19:47 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Grand Junction, CO (KGJT), launched 12:00Z, 7.8 hours before the alert went out and 276 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1728 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 22 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter storm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Denver/Boulder, CO wrote its last area forecast discussion before this winter storm warning went out at Apr 24, 11:36 AM MDT, 2 hours 9 minutes earlier.
Area forecast discussion, Apr 24, 11:36 AM MDT, 2 hours 9 minutes before
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</html>Hazardous weather outlook, Apr 24, 11:07 AM MDT, 2 hours 38 minutes before
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</html>Nearby
Winter Storm Warnings in Colorado, 2023Every winter storm warning in 2023
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.