Alert archive / Virginia / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 99, NWS Wakefield, VA

July 19, 2007Henrico County, City of Richmond, Virginia

NWS Wakefield, VA issued this severe thunderstorm warning at Jul 19, 2007, 8:40 PM EDT for Henrico County, City of Richmond, Virginia. It was in force for 35 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, 2007, 8:40 PM EDT (00:40 UTC)
Expired: Jul 19, 2007, 9:15 PM EDT
In force: 35 min
Issued by: NWS Wakefield, VA
Area: Counties, with a storm outline in the text

Counties City of Richmond, VA, Henrico County, VA

The radar

The Norfolk radar (KAKQ), 67 km from the middle of the area, began a volume at 00:40 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 19, 2:07 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Roanoke, VA (KRNK), launched 00:00Z, 0.7 hours before the alert went out and 191 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: 354 J/kg
Mixed-layer CIN: -21 J/kg
Mixed-layer LCL: 1616 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 50 m²/s²
0-3 km storm-relative helicity: 82 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 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, 6:46 PM EDT, 1 hour 54 minutes earlier.

Area forecast discussion, Jul 19, 6:46 PM EDT, 1 hour 54 minutes before

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Hazardous weather outlook, Jul 19, 6:49 PM EDT, 1 hour 51 minutes before

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In the hours before

Local storm report, Jul 19, 6:04 PM EDT, 2 hours 36 minutes before

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Special weather statement, Jul 19, 6:04 PM EDT, 2 hours 36 minutes before

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Local storm report, Jul 19, 6:06 PM EDT, 2 hours 34 minutes before

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Special weather statement, Jul 19, 6:57 PM EDT, 1 hour 43 minutes before

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Special weather statement, Jul 19, 7:07 PM EDT, 1 hour 33 minutes before

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Local storm report, Jul 19, 7:47 PM EDT, 53 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 19, 8:22 PM EDT	Severe Thunderstorm Warning	AKQ	Chesterfield	53 min
Jul 19, 11:46 PM EDT	Special Marine Warning	AKQ		59 min
Jul 20, 12:09 AM EDT	Severe Thunderstorm Warning	AKQ	Northampton	33 min
Jul 20, 12:16 AM EDT	Special Marine Warning	AKQ		59 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2007 Every severe thunderstorm warning in 2007

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.