Alert archive / Virginia / Severe Thunderstorm Warnings in 2010

Severe Thunderstorm Warning 73, NWS Wakefield, VA

July 19, 2010Northampton County, Virginia

NWS Wakefield, VA issued this severe thunderstorm warning at Jul 19, 2010, 6:19 PM EDT for Northampton County, Virginia. It was in force for 41 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 19, 2010, 6:19 PM EDT (22:19 UTC)
Expired: Jul 19, 2010, 7:00 PM EDT
In force: 41 min
Issued by: NWS Wakefield, VA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Northampton County, VA

The radar

The Norfolk radar (KAKQ), 102 km from the middle of the area, began a volume at 22:21 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 10.3 hours before the alert went out and 242 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: 775 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 883 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: -31 m²/s²
0-3 km storm-relative helicity: 75 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Jul 19, 4:20 PM EDT, 1 hour 59 minutes earlier.

Area forecast discussion, Jul 19, 4:20 PM EDT, 1 hour 59 minutes before

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Hazardous weather outlook, Jul 19, 4:36 PM EDT, 1 hour 43 minutes before

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In the hours before

Special weather statement, Jul 19, 12:42 PM EDT, 5 hours 37 minutes before

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Special weather statement, Jul 19, 1:22 PM EDT, 4 hours 57 minutes before

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Special weather statement, Jul 19, 2:11 PM EDT, 4 hours 8 minutes before

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Special weather statement, Jul 19, 2:15 PM EDT, 4 hours 4 minutes before

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Special weather statement, Jul 19, 5:53 PM EDT, 26 minutes before

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Special weather statement, Jul 19, 6:18 PM EDT, 1 minute 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 18, 8:05 PM EDT	Special Weather Statement	AKQ	Mathews	40 min
Jul 18, 8:09 PM EDT	Severe Thunderstorm Warning	AKQ	Gloucester, James City, King and Queen, New Kent	51 min
Jul 18, 8:31 PM EDT	Severe Thunderstorm Warning	AKQ	Gloucester, Mathews, Middlesex	44 min
Jul 18, 8:51 PM EDT	Special Marine Warning	AKQ		54 min
Jul 18, 9:01 PM EDT	Special Weather Statement	AKQ	Westmoreland	59 min
Jul 18, 9:07 PM EDT	Severe Thunderstorm Warning	AKQ	Gloucester, Mathews, Middlesex	53 min
Jul 18, 9:31 PM EDT	Severe Thunderstorm Warning	AKQ	Lancaster, Northumberland	44 min
Jul 18, 9:34 PM EDT	Special Marine Warning	AKQ		86 min
Jul 18, 9:38 PM EDT	Flash Flood Warning	AKQ	Gloucester, Mathews, Middlesex	2 hr
Jul 18, 10:03 PM EDT	Areal Flood Advisory	AKQ	King and Queen, New Kent	117 min
Jul 18, 10:07 PM EDT	Small Craft Advisory	AKQ		9 hr
Jul 19, 9:32 AM EDT	Small Craft Advisory	AKQ		9 hr
Jul 19, 11:37 AM EDT	Special Weather Statement	AKQ	Amelia, Powhatan	53 min
Jul 19, 12:42 PM EDT	Special Weather Statement	AKQ	City of Petersburg	33 min
Jul 19, 1:22 PM EDT	Special Weather Statement	AKQ	Charles City, Gloucester, James City, Prince George, Surry, City of Williamsburg	53 min
Jul 19, 1:27 PM EDT	Special Marine Warning	AKQ		93 min
Jul 19, 2:11 PM EDT	Special Weather Statement	AKQ	Gloucester, James City, King and Queen, Lancaster, Middlesex, Northumberland and 2 more	64 min
Jul 19, 3:04 PM EDT	Special Marine Warning	AKQ		86 min
Jul 19, 5:44 PM EDT	Special Marine Warning	AKQ		61 min
Jul 19, 5:53 PM EDT	Special Weather Statement	AKQ	Mathews, York	52 min
Jul 19, 6:18 PM EDT	Special Weather Statement	AKQ	Northampton	42 min
Jul 19, 6:41 PM EDT	Special Marine Warning	AKQ		64 min
Jul 19, 6:47 PM EDT	Special Marine Warning	AKQ		43 min
Jul 19, 6:54 PM EDT	Special Marine Warning	AKQ		66 min
Jul 19, 7:02 PM EDT	Special Weather Statement	AKQ	City of Chesapeake, City of Suffolk, City of Virginia Beach	58 min
Jul 19, 7:10 PM EDT	Special Marine Warning	AKQ		95 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2010 Every severe thunderstorm warning in 2010

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.