Alert archive / Colorado / Winter Storm Warnings in 2011
Winter Storm Warning 29, NWS Grand Junction, CO
NWS Grand Junction, CO issued this winter storm warning at Dec 12, 2011, 2:10 AM MST for 7 counties in Colorado; Grand County, San Juan County, Utah. It took effect at Dec 12, 2011, 12:00 PM MST. It was in force for 48 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
- Dec 12, 2011, 2:10 AM MST (09:10 UTC)
- In effect from
- Dec 12, 2011, 12:00 PM MST
- Expired
- Dec 14, 2011, 12:00 PM MST
- In force
- 48 hr
- Issued by
- NWS Grand Junction, CO
Counties Archuleta County, CO, Dolores County, CO, Hinsdale County, CO, La Plata County, CO, Montezuma County, CO, San Juan County, CO, San Miguel County, CO, Grand County, UT, San Juan County, UT
The radar
The Grand Junction radar (KGJX), 146 km from the middle of the area, began a volume at 09:09 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
Flgstf/Belemont, AZ (KFGZ), launched 00:00Z, 9.2 hours before the alert went out and 420 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
- 1852 m above ground
- 0-6 km bulk shear
- 83 kt
- 0-1 km storm-relative helicity
- 76 m²/s²
- 0-3 km storm-relative helicity
- 181 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 Grand Junction, CO wrote its last area forecast discussion before this winter storm warning went out at Dec 11, 8:39 PM MST, 5 hours 31 minutes earlier.
Area forecast discussion, Dec 11, 8:39 PM MST, 5 hours 31 minutes before
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</html>The office that day
Everything else NWS Grand Junction, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 12, 2:10 AM MST | Winter Weather Advisory | GJT | Delta, Dolores, Eagle, Garfield, Gunnison, Hinsdale and 9 more | 60 hr |
Nearby
Winter Storm Warnings in Colorado, 2011Winter Storm Warnings in Utah, 2011Every winter storm warning 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.