Alert archive / Colorado / Winter Storm Watches in 2011
Winter Storm Watch 4, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this winter storm watch at Feb 23, 2011, 2:05 PM MST for 4 counties in Colorado. It took effect at Feb 24, 2011, 6:00 PM MST. It was in force for .
The area
The counties it named.
The facts
- Issued
- Feb 23, 2011, 2:05 PM MST (21:05 UTC)
- In effect from
- Feb 24, 2011, 6:00 PM MST
- Expired
- Feb 24, 2011, 12:15 PM MST
- In force
- Issued by
- NWS Denver/Boulder, CO
Counties Boulder County, CO, Grand County, CO, Jackson County, CO, Larimer County, CO
The radar
The Cheyenne radar (KCYS), 121 km from the middle of the area, began a volume at 21:11 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, 9.1 hours before the alert went out and 268 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
- 1604 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 56 m²/s²
- 0-3 km storm-relative helicity
- 168 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 watch 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 watch went out at Feb 23, 4:45 AM MST, 9 hours 20 minutes earlier.
Area forecast discussion, Feb 23, 4:45 AM MST, 9 hours 20 minutes before
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</html>Hazardous weather outlook, Feb 23, 11:43 AM MST, 2 hours 22 minutes before
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Winter Storm Watches in Colorado, 2011Every winter storm watch in 2011
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.