Alert archive / Virginia / Heat Advisories in 2012

Heat Advisory 7, NWS Wakefield, VA

July 17, 201236 counties in Virginia; 9 counties in North Carolina; 4 counties in Maryland

NWS Wakefield, VA issued this heat advisory at Jul 17, 2012, 3:07 PM EDT for 36 counties in Virginia; 9 counties in North Carolina; 4 counties in Maryland. It took effect at Jul 18, 2012, 11:00 AM EDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Jul 17, 2012, 3:07 PM EDT (19:07 UTC)
In effect from: Jul 18, 2012, 11:00 AM EDT
Expired: Jul 18, 2012, 8:00 PM EDT
In force: 9 hr
Issued by: NWS Wakefield, VA

All 49 counties

Dorchester County, MD, Somerset County, MD, Wicomico County, MD, Worcester County, MD, 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, Accomack County, VA, 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 Virginia Beach, 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, Northampton 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), 23 km from the middle of the area, began a volume at 19:10 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, 7.1 hours before the alert went out and 225 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: 528 J/kg
Mixed-layer CIN: -52 J/kg
Mixed-layer LCL: 963 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: -1 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 heat advisory 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 heat advisory went out at Jul 17, 1:24 PM EDT, 1 hour 43 minutes earlier.

Area forecast discussion, Jul 17, 1:24 PM EDT, 1 hour 43 minutes before

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Hazardous weather outlook, Jul 17, 5:07 AM EDT, 10 hours before

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In the hours before

Special weather statement, Jul 17, 2:54 PM EDT, 13 minutes before

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Special weather statement, Jul 17, 3:07 PM EDT, 0 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
Jul 17, 2:54 PM EDT	Special Weather Statement	AKQ	City of Virginia Beach	36 min
Jul 17, 3:07 PM EDT	Special Weather Statement	AKQ	City of Virginia Beach	23 min
Jul 17, 5:38 PM EDT	Special Weather Statement	AKQ	City of Portsmouth	37 min

Nearby

Heat Advisories in Virginia, 2012 Heat Advisories in North Carolina, 2012 Heat Advisories in Maryland, 2012 Every heat advisory 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.