Alert archive / Colorado / Winter Weather Advisories in 2012
Winter Weather Advisory 7, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this winter weather advisory at Feb 21, 2012, 4:22 AM MST for Grand County, Jackson County, Colorado. It was in force for 17 hr.
The area
The counties it named.
The facts
- Issued
- Feb 21, 2012, 4:22 AM MST (11:22 UTC)
- Expired
- Feb 21, 2012, 8:56 PM MST
- In force
- 17 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Grand County, CO, Jackson County, CO
The radar
The Cheyenne radar (KCYS), 147 km from the middle of the area, began a volume at 11:19 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 00:00Z, 11.4 hours before the alert went out and 239 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
- 1237 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 94 m²/s²
- 0-3 km storm-relative helicity
- 156 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The office that day
Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 21, 4:17 AM MST | High Wind Warning | BOU | Boulder, Broomfield, Clear Creek, Douglas, Gilpin, Grand and 7 more | 48 hr |
Nearby
Winter Weather Advisories in Colorado, 2012Every winter weather advisory in 2012
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.