Alert archive / Virginia / Freeze Warnings in 2012

Freeze Warning 8, NWS Baltimore/Washington

April 10, 20127 counties in Virginia; Allegany County, Maryland; 5 counties in West Virginia

NWS Baltimore/Washington issued this freeze warning at Apr 10, 2012, 3:28 AM EDT for 7 counties in Virginia; Allegany County, Maryland; 5 counties in West Virginia. It took effect at Apr 11, 2012, 2:00 AM EDT. It was in force for 7 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 10, 2012, 3:28 AM EDT (07:28 UTC)
In effect from: Apr 11, 2012, 2:00 AM EDT
Expired: Apr 11, 2012, 8:57 AM EDT
In force: 7 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, Hampshire County, WV, Hardy County, WV, Mineral County, WV, Pendleton County, WV

The radar

The Sterling radar (KLWX), 126 km from the middle of the area, began a volume at 07:30 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 7.5 hours before the alert went out and 133 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: 2014 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: -45 m²/s²
0-3 km storm-relative helicity: 39 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 9, 10:48 PM EDT, 4 hours 40 minutes earlier.

Area forecast discussion, Apr 9, 10:48 PM EDT, 4 hours 40 minutes before

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Hazardous weather outlook, Apr 10, 1:26 AM EDT, 2 hours 2 minutes before

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In the hours before

Special weather statement, Apr 9, 9:39 PM EDT, 5 hours 49 minutes before

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Special weather statement, Apr 9, 9:49 PM EDT, 5 hours 39 minutes before

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Special weather statement, Apr 9, 10:04 PM EDT, 5 hours 24 minutes before

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Special weather statement, Apr 9, 10:23 PM EDT, 5 hours 5 minutes before

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Special weather statement, Apr 9, 10:50 PM EDT, 4 hours 38 minutes before

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Special weather statement, Apr 9, 11:15 PM EDT, 4 hours 13 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 9, 8:28 PM EDT	Gale Warning	LWX		5 hr
Apr 9, 8:39 PM EDT	Red Flag Warning	LWX	Albemarle, Arlington, Augusta, Clarke, Culpeper, Fairfax and 21 more	27 hr
Apr 9, 9:09 PM EDT	Special Weather Statement	LWX	Shenandoah	51 min
Apr 9, 9:23 PM EDT	Special Weather Statement	LWX	Loudoun	52 min
Apr 9, 9:39 PM EDT	Special Weather Statement	LWX	Warren	51 min
Apr 9, 9:49 PM EDT	Special Weather Statement	LWX	Loudoun	26 min
Apr 9, 10:04 PM EDT	Special Weather Statement	LWX	Page, Rappahannock, Shenandoah, Warren	41 min
Apr 9, 10:23 PM EDT	Special Weather Statement	LWX	Fairfax, Fauquier, Prince William, City of Fairfax, City of Manassas, City of Manassas Park	37 min
Apr 9, 10:50 PM EDT	Special Weather Statement	LWX	Rappahannock	25 min
Apr 9, 11:15 PM EDT	Special Weather Statement	LWX	Culpeper, Fauquier	30 min
Apr 10, 4:40 AM EDT	Small Craft Advisory	LWX		33 hr
Apr 10, 3:54 PM EDT	Freeze Watch	LWX	Clarke, Fauquier, Frederick, Greene, Highland, Madison and 11 more	22 hr
Apr 9, 9:17 PM EDT	Special Weather Statement	LWX	Grant	43 min

Nearby

Freeze Warnings in Virginia, 2012 Freeze Warnings in West 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.