Alert archive / Virginia / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 262, NWS Blacksburg, VA

September 11, 2019Henry County, City of Martinsville, Virginia

NWS Blacksburg, VA issued this severe thunderstorm warning at Sep 11, 2019, 10:59 PM EDT for Henry County, City of Martinsville, Virginia. It was in force for 61 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: Sep 11, 2019, 10:59 PM EDT (02:59 UTC)
Expired: Sep 12, 2019, 12:00 AM EDT
In force: 61 min
Issued by: NWS Blacksburg, VA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties City of Martinsville, VA, Henry County, VA

The radar

The Roanoke radar (KFCX), 48 km from the middle of the area, began a volume at 03:02 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 00:00Z, 3.0 hours before the alert went out and 68 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: 527 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 1908 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 27 m²/s²
0-3 km storm-relative helicity: 53 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 Blacksburg, VA wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 11, 9:28 PM EDT, 1 hour 31 minutes earlier.

Area forecast discussion, Sep 11, 9:28 PM EDT, 1 hour 31 minutes before

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Hazardous weather outlook, Sep 11, 10:36 PM EDT, 23 minutes before

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In the hours before

Local storm report, Sep 11, 9:20 PM EDT, 1 hour 39 minutes before

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Local storm report, Sep 11, 9:21 PM EDT, 1 hour 38 minutes before

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Local storm report, Sep 11, 9:29 PM EDT, 1 hour 30 minutes before

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Local storm report, Sep 11, 9:43 PM EDT, 1 hour 16 minutes before

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Local storm report, Sep 11, 10:30 PM EDT, 29 minutes before

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Special weather statement, Sep 11, 10:53 PM EDT, 6 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
Sep 11, 8:21 PM EDT	Special Weather Statement	RNK	Pittsylvania	39 min
Sep 11, 8:43 PM EDT	Severe Thunderstorm Warning	RNK	Pittsylvania	45 min
Sep 11, 8:52 PM EDT	Special Weather Statement	RNK	Halifax	53 min
Sep 11, 9:19 PM EDT	Special Weather Statement	RNK	City of Danville	56 min
Sep 11, 10:53 PM EDT	Special Weather Statement	RNK	Henry, City of Martinsville	52 min
Sep 12, 3:10 PM EDT	Special Weather Statement	RNK	Franklin	50 min
Sep 12, 3:59 PM EDT	Special Weather Statement	RNK	Bedford	46 min
Sep 12, 4:23 PM EDT	Special Weather Statement	RNK	Campbell	37 min
Sep 12, 4:53 PM EDT	Special Weather Statement	RNK	Franklin	52 min
Sep 12, 5:06 PM EDT	Special Weather Statement	RNK	Halifax	54 min
Sep 12, 12:27 AM EDT	Special Weather Statement	RNK	Rockingham	48 min
Sep 12, 3:21 PM EDT	Special Weather Statement	RNK	Surry	39 min
Sep 12, 4:25 PM EDT	Special Weather Statement	RNK	Stokes	50 min
Sep 12, 6:13 PM EDT	Special Weather Statement	RNK	Alleghany	47 min
Sep 12, 6:14 PM EDT	Special Weather Statement	RNK	Rockingham	61 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2019 Every severe thunderstorm warning in 2019

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.