Alert archive / North Carolina / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 213, NWS Blacksburg, VA

July 27, 2009Yadkin County, North Carolina

NWS Blacksburg, VA issued this severe thunderstorm warning at Jul 27, 2009, 2:26 PM EDT for Yadkin County, North Carolina. It was in force for 34 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 27, 2009, 2:26 PM EDT (18:26 UTC)
Expired: Jul 27, 2009, 3:00 PM EDT
In force: 34 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon

County Yadkin County, NC

The radar

The Roanoke radar (KFCX), 102 km from the middle of the area, began a volume at 18:26 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

Charleston AFB, SC (KCHS), launched 12:00Z, 6.4 hours before the alert went out and 368 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: 1073 J/kg
Mixed-layer CIN: -49 J/kg
Mixed-layer LCL: 1130 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 48 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.9

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 Blacksburg, VA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 27, 1:24 PM EDT, 1 hour 2 minutes earlier.

Area forecast discussion, Jul 27, 1:24 PM EDT, 1 hour 2 minutes before

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Hazardous weather outlook, Jul 27, 10:03 AM EDT, 4 hours 23 minutes before

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In the hours before

Local storm report, Jul 27, 12:05 PM EDT, 2 hours 21 minutes before

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Special weather statement, Jul 27, 1:42 PM EDT, 44 minutes before

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Special weather statement, Jul 27, 2:09 PM EDT, 17 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 9:00 PM EDT	Special Weather Statement	RNK	Rockbridge, City of Buena Vista, City of Lexington	30 min
Jul 26, 10:40 PM EDT	Special Weather Statement	RNK	Smyth	65 min
Jul 26, 11:16 PM EDT	Special Weather Statement	RNK	Bedford	59 min
Jul 26, 11:43 PM EDT	Special Weather Statement	RNK	Pittsylvania	32 min
Jul 27, 12:07 AM EDT	Special Weather Statement	RNK	Smyth	38 min
Jul 27, 12:20 AM EDT	Special Weather Statement	RNK	Appomattox, Campbell	55 min
Jul 27, 12:34 AM EDT	Special Weather Statement	RNK	Montgomery, City of Radford	41 min
Jul 27, 12:54 AM EDT	Flash Flood Warning	RNK	Smyth	3 hr
Jul 27, 1:08 AM EDT	Special Weather Statement	RNK	Wythe	52 min
Jul 27, 1:51 AM EDT	Special Weather Statement	RNK	Montgomery, City of Radford	39 min
Jul 27, 2:23 AM EDT	Flash Flood Warning	RNK	Montgomery, Roanoke, City of Roanoke, City of Salem	2 hr
Jul 27, 3:22 AM EDT	Special Weather Statement	RNK	Grayson, City of Galax	53 min
Jul 27, 4:04 PM EDT	Special Weather Statement	RNK	City of Danville	56 min
Jul 27, 4:05 PM EDT	Special Weather Statement	RNK	Halifax	55 min
Jul 27, 4:13 PM EDT	Special Weather Statement	RNK	Bedford	62 min
Jul 26, 10:16 PM EDT	Special Weather Statement	RNK	Rockingham	44 min
Jul 27, 2:09 PM EDT	Special Weather Statement	RNK	Wilkes	66 min
Jul 27, 3:04 PM EDT	Special Weather Statement	RNK	Wilkes	41 min
Jul 27, 3:29 PM EDT	Special Weather Statement	RNK	Surry	46 min
Jul 27, 3:39 PM EDT	Special Weather Statement	RNK	Yadkin	66 min
Jul 27, 4:06 PM EDT	Special Weather Statement	RNK	Stokes	54 min
Jul 27, 4:33 PM EDT	Special Weather Statement	RNK	Caswell	57 min

Nearby

Severe Thunderstorm Warnings in North Carolina, 2009 Every severe thunderstorm warning in 2009

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.