Alert archive / Virginia / Freeze Warnings in 2012

Freeze Warning 19, NWS Baltimore/Washington

November 2, 20128 counties in Virginia

NWS Baltimore/Washington issued this freeze warning at Nov 2, 2012, 4:36 PM EDT for 8 counties in Virginia. It took effect at Nov 3, 2012, 12:00 AM EDT. It was in force for 4 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: Nov 2, 2012, 4:36 PM EDT (20:36 UTC)
In effect from: Nov 3, 2012, 12:00 AM EDT
Expired: Nov 3, 2012, 4:26 AM EDT
In force: 4 hr
Issued by: NWS Baltimore/Washington

Counties City of Charlottesville, VA, City of Harrisonburg, VA, City of Staunton, VA, City of Waynesboro, VA, Greene County, VA, Nelson County, VA, Page County, VA, Rockingham County, VA

The radar

The Sterling radar (KLWX), 137 km from the middle of the area, began a volume at 20:36 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, 8.6 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: 1675 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 107 m²/s²
0-3 km storm-relative helicity: 240 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 Nov 2, 3:21 PM EDT, 1 hour 15 minutes earlier.

Area forecast discussion, Nov 2, 3:21 PM EDT, 1 hour 15 minutes before

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Hazardous weather outlook, Nov 2, 3:24 PM EDT, 1 hour 12 minutes before

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In the hours before

Local storm report, Nov 2, 12:20 PM EDT, 4 hours 16 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
Nov 2, 10:45 AM EDT	Small Craft Advisory	LWX		37 hr

Nearby

Freeze Warnings in Virginia, 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.