Alert archive / Colorado / Winter Weather Advisories in 2011
Winter Weather Advisory 49, NWS Denver/Boulder, CO
NWS Denver/Boulder, CO issued this winter weather advisory at Dec 19, 2011, 4:58 AM MST for 5 counties in Colorado. It took effect at Dec 19, 2011, 11:00 AM MST. It was in force for 17 hr.
The area
The counties it named.
The facts
- Issued
- Dec 19, 2011, 4:58 AM MST (11:58 UTC)
- In effect from
- Dec 19, 2011, 11:00 AM MST
- Expired
- Dec 20, 2011, 4:23 AM MST
- In force
- 17 hr
- Issued by
- NWS Denver/Boulder, CO
Counties Elbert County, CO, Lincoln County, CO, Logan County, CO, Phillips County, CO, Washington County, CO
The radar
The Denver radar (KFTG), 110 km from the middle of the area, began a volume at 12:04 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
Dodge City, (KDDC), launched 00:00Z, 12.0 hours before the alert went out and 376 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
- 1765 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 132 m²/s²
- 0-3 km storm-relative helicity
- 154 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 weather advisory 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 weather advisory went out at Dec 19, 4:15 AM MST, 43 minutes earlier.
Area forecast discussion, Dec 19, 4:15 AM MST, 43 minutes before
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Everything else NWS Denver/Boulder, CO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 19, 11:07 AM MST | Winter Storm Warning | BOU | Elbert, Lincoln | 17 hr |
Nearby
Winter Weather Advisories in Colorado, 2011Every winter weather advisory 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.