Alert archive / Virginia / Excessive Heat Warnings in 2012

Excessive Heat Warning 1, NWS Wakefield, VA

June 29, 201233 counties in Virginia; 9 counties in North Carolina

NWS Wakefield, VA issued this excessive heat warning at Jun 29, 2012, 1:18 PM EDT for 33 counties in Virginia; 9 counties in North Carolina. It was in force for 26 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: Jun 29, 2012, 1:18 PM EDT (17:18 UTC)
Expired: Jun 30, 2012, 3:34 PM EDT
In force: 26 hr
Issued by: NWS Wakefield, VA

All 42 counties

Bertie County, NC, Camden County, NC, Chowan County, NC, Currituck County, NC, Gates County, NC, Hertford County, NC, Northampton County, NC, Pasquotank County, NC, Perquimans County, NC, Amelia County, VA, Brunswick County, VA, Caroline County, VA, Charles City County, VA, City of Chesapeake, VA, City of Emporia, VA, City of Franklin, VA, City of Hopewell, VA, City of Petersburg, VA, City of Williamsburg, VA, Cumberland County, VA, Dinwiddie County, VA, Fluvanna County, VA, Gloucester County, VA, Goochland County, VA, Greensville County, VA, James City County, VA, Lancaster County, VA, Lunenburg County, VA, Mathews County, VA, Mecklenburg County, VA, Middlesex County, VA, New Kent County, VA, Northumberland County, VA, Nottoway County, VA, Powhatan County, VA, Prince Edward County, VA, Prince George County, VA, Richmond County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA, Westmoreland County, VA

The radar

The Norfolk radar (KAKQ), 16 km from the middle of the area, began a volume at 17:17 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, 5.3 hours before the alert went out and 208 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: 238 J/kg
Mixed-layer CIN: -630 J/kg
Mixed-layer LCL: 1902 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 113 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 excessive heat warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Wakefield, VA wrote its last area forecast discussion before this excessive heat warning went out at Jun 29, 10:24 AM EDT, 2 hours 54 minutes earlier.

Area forecast discussion, Jun 29, 10:24 AM EDT, 2 hours 54 minutes before

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Hazardous weather outlook, Jun 29, 10:47 AM EDT, 2 hours 31 minutes before

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The office that day

Everything else NWS Wakefield, VA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 29, 3:51 AM EDT	Heat Advisory	AKQ	Amelia, Brunswick, Caroline, Charles City, Cumberland, Dinwiddie and 27 more	13 hr

Nearby

Excessive Heat Warnings in Virginia, 2012 Excessive Heat Warnings in North Carolina, 2012 Every excessive heat 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.