Alert archive / West Virginia / Freeze Warnings in 2012

Freeze Warning 14, NWS Baltimore/Washington

April 27, 20124 counties in Virginia; 4 counties in Maryland; 8 counties in West Virginia

NWS Baltimore/Washington issued this freeze warning at Apr 27, 2012, 1:55 PM EDT for 4 counties in Virginia; 4 counties in Maryland; 8 counties in West Virginia. It took effect at Apr 28, 2012, 1:00 AM EDT. It was in force for 8 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 27, 2012, 1:55 PM EDT (17:55 UTC)
In effect from: Apr 28, 2012, 1:00 AM EDT
Expired: Apr 28, 2012, 9:00 AM EDT
In force: 8 hr
Issued by: NWS Baltimore/Washington

Counties Allegany County, MD, Carroll County, MD, Frederick County, MD, Washington County, MD, City of Winchester, VA, Clarke County, VA, Frederick County, VA, Highland County, VA, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV, Pendleton County, WV

The radar

The Sterling radar (KLWX), 83 km from the middle of the area, began a volume at 17:58 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 5.9 hours before the alert went out and 197 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1400 m above ground
0-6 km bulk shear: 74 kt
0-1 km storm-relative helicity: -180 m²/s²
0-3 km storm-relative helicity: -112 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 27, 10:57 AM EDT, 2 hours 58 minutes earlier.

Area forecast discussion, Apr 27, 10:57 AM EDT, 2 hours 58 minutes before

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Hazardous weather outlook, Apr 27, 1:05 PM EDT, 50 minutes before

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The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 26, 10:13 PM EDT	Special Marine Warning	LWX		27 min
Apr 27, 12:09 AM EDT	Gale Warning	LWX		6 hr
Apr 27, 12:09 AM EDT	Small Craft Advisory	LWX		28 hr
Apr 27, 8:06 AM EDT	Gale Warning	LWX		5 hr
Apr 27, 8:06 AM EDT	Small Craft Advisory	LWX		20 hr
Apr 27, 10:03 AM EDT	Freeze Watch	LWX	Clarke, Frederick, City of Winchester	4 hr
Apr 27, 1:55 PM EDT	Frost Advisory	LWX	Fauquier, Page, Rappahannock, Rockingham, Shenandoah, Warren and 3 more	18 hr
Apr 26, 8:41 PM EDT	Special Weather Statement	LWX	Carroll	34 min

Nearby

Freeze Warnings in West Virginia, 2012 Freeze Warnings in Virginia, 2012 Freeze Warnings in Maryland, 2012 Every 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.