Alert archive / Virginia / Freeze Warnings in 2012
Freeze Warning 12, NWS Baltimore/Washington
NWS Baltimore/Washington issued this freeze warning at Apr 24, 2012, 2:09 PM EDT for 7 counties in Virginia; Allegany County, Maryland; 4 counties in West Virginia. It took effect at Apr 25, 2012, 2:00 AM EDT. It was in force for 6 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, 2012, 2:09 PM EDT (18:09 UTC)
- In effect from
- Apr 25, 2012, 2:00 AM EDT
- Expired
- Apr 25, 2012, 7:43 AM EDT
- In force
- 6 hr
- Issued by
- NWS Baltimore/Washington
Counties Allegany County, MD, City of Harrisonburg, VA, City of Staunton, VA, City of Waynesboro, VA, Highland County, VA, Page County, VA, Rockingham County, VA, Shenandoah County, VA, Grant County, WV, Hardy County, WV, Mineral County, WV, Pendleton County, WV
The radar
The Sterling radar (KLWX), 129 km from the middle of the area, began a volume at 18:13 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
Roanoke, VA (KRNK), launched 12:00Z, 6.2 hours before the alert went out and 178 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
- 1882 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 169 m²/s²
- 0-3 km storm-relative helicity
- 241 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this freeze warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Baltimore/Washington wrote its last area forecast discussion before this freeze warning went out at Apr 23, 7:37 PM EDT, 18 hours 32 minutes earlier.
Area forecast discussion, Apr 23, 7:37 PM EDT, 18 hours 32 minutes before
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</html>Hazardous weather outlook, Apr 23, 7:34 PM EDT, 18 hours 35 minutes before
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</html>The office that day
Everything else NWS Baltimore/Washington issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 23, 9:29 PM EDT | Freeze Warning | LWX | Highland | 11 hr |
| Apr 24, 2:10 PM EDT | Small Craft Advisory | LWX | 29 hr |
Nearby
Freeze Warnings in Virginia, 2012Freeze Warnings in West Virginia, 2012Freeze Warnings in Maryland, 2012Every freeze warning 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.