Alert archive / Virginia / Heat Advisories in 2012

Heat Advisory 9, NWS Wakefield, VA

July 24, 20129 counties in Virginia; 9 counties in North Carolina

NWS Wakefield, VA issued this heat advisory at Jul 24, 2012, 3:55 AM EDT for 9 counties in Virginia; 9 counties in North Carolina. It took effect at Jul 24, 2012, 11:00 AM EDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Jul 24, 2012, 3:55 AM EDT (07:55 UTC)
In effect from: Jul 24, 2012, 11:00 AM EDT
Expired: Jul 24, 2012, 5:47 PM EDT
In force: 7 hr
Issued by: NWS Wakefield, VA

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, City of Chesapeake, VA, City of Emporia, VA, City of Franklin, VA, City of Williamsburg, VA, Greensville County, VA, James City County, VA, Southampton County, VA, Surry County, VA, Sussex County, VA

The radar

The Norfolk radar (KAKQ), 47 km from the middle of the area, began a volume at 07:56 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

Newport, NC (KMHX), launched 00:00Z, 7.9 hours before the alert went out and 201 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: 1760 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 1040 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 136 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.8

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 23, 10:26 PM EDT, 5 hours 29 minutes earlier.

Area forecast discussion, Jul 23, 10:26 PM EDT, 5 hours 29 minutes before

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Hazardous weather outlook, Jul 23, 10:29 PM EDT, 5 hours 26 minutes before

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In the hours before

Special weather statement, Jul 23, 10:39 PM EDT, 5 hours 16 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 24, 3:43 AM EDT	Small Craft Advisory	AKQ		35 hr
Jul 24, 2:59 PM EDT	Special Weather Statement	AKQ	Caroline, Fluvanna, Goochland, Louisa	61 min
Jul 24, 3:21 PM EDT	Special Weather Statement	AKQ	Henrico, City of Colonial Heights, City of Hopewell	39 min
Jul 24, 3:59 PM EDT	Special Weather Statement	AKQ	Charles City, Prince George, Surry, City of Williamsburg	61 min
Jul 24, 4:00 PM EDT	Special Marine Warning	AKQ		45 min
Jul 24, 4:00 PM EDT	Special Weather Statement	AKQ	Caroline, Hanover	30 min
Jul 24, 4:29 PM EDT	Special Marine Warning	AKQ		61 min
Jul 24, 4:31 PM EDT	Special Weather Statement	AKQ	Gloucester, James City, Surry, York, City of Hampton, City of Newport News and 2 more	59 min
Jul 24, 4:33 PM EDT	Special Weather Statement	AKQ	King and Queen, King William	27 min
Jul 24, 4:44 PM EDT	Severe Thunderstorm Warning	AKQ	Gloucester, James City, Mathews, Surry, York, City of Hampton and 3 more	46 min
Jul 24, 4:52 PM EDT	Special Marine Warning	AKQ		38 min
Jul 24, 5:14 PM EDT	Special Marine Warning	AKQ		106 min
Jul 24, 5:14 PM EDT	Severe Thunderstorm Warning	AKQ	Isle of Wight, City of Hampton, City of Newport News, City of Norfolk	31 min
Jul 24, 5:35 PM EDT	Special Weather Statement	AKQ	James City, York, City of Williamsburg	55 min
Jul 24, 6:30 PM EDT	Special Weather Statement	AKQ	City of Virginia Beach	25 min
Jul 24, 6:31 PM EDT	Special Marine Warning	AKQ		104 min
Jul 23, 10:39 PM EDT	Special Weather Statement	AKQ	Camden, Currituck, Pasquotank	81 min
Jul 24, 3:47 PM EDT	Special Weather Statement	AKQ	Northampton	58 min
Jul 24, 4:47 PM EDT	Special Weather Statement	AKQ	Bertie, Hertford	43 min
Jul 24, 5:20 PM EDT	Severe Thunderstorm Warning	AKQ	Bertie, Chowan	40 min
Jul 24, 5:53 PM EDT	Severe Thunderstorm Warning	AKQ	Chowan, Pasquotank, Perquimans	52 min
Jul 24, 6:57 PM EDT	Special Weather Statement	AKQ	Currituck	33 min
Jul 24, 6:25 PM EDT	Special Weather Statement	AKQ	Worcester	50 min

Nearby

Heat Advisories in Virginia, 2012 Heat Advisories in North Carolina, 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.