Alert archive / West Virginia / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 256, NWS Baltimore/Washington

October 15, 2014Rockingham County, Virginia; Grant County, Hardy County, Pendleton County, West Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Oct 15, 2014, 4:32 AM EDT for Rockingham County, Virginia; Grant County, Hardy County, Pendleton County, West Virginia. It was in force for 58 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: Oct 15, 2014, 4:32 AM EDT (08:32 UTC)
Expired: Oct 15, 2014, 5:30 AM EDT
In force: 58 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon

Counties Rockingham County, VA, Grant County, WV, Hardy County, WV, Pendleton County, WV

The radar

The Sterling radar (KLWX), 138 km from the middle of the area, began a volume at 08:32 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

Washington/Dulle, VA (KIAD), launched 00:00Z, 8.5 hours before the alert went out and 145 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: 24 J/kg
Mixed-layer CIN: -15 J/kg
Mixed-layer LCL: 813 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 263 m²/s²
0-3 km storm-relative helicity: 326 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

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 Baltimore/Washington wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 15, 4:00 AM EDT, 32 minutes earlier.

Area forecast discussion, Oct 15, 4:00 AM EDT, 32 minutes before

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Hazardous weather outlook, Oct 15, 4:28 AM EDT, 4 minutes before

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The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 15, 3:30 AM EDT	Flood Watch	LWX	Arlington, Culpeper, Fairfax, Fauquier, Greene, Madison and 8 more	14 hr
Oct 15, 5:13 AM EDT	Severe Thunderstorm Warning	LWX	Frederick	47 min
Oct 15, 6:16 AM EDT	Severe Thunderstorm Warning	LWX	Clarke, Fauquier, Frederick, Loudoun, Rappahannock, Shenandoah and 2 more	59 min
Oct 15, 6:21 AM EDT	Tornado Warning	LWX	Clarke, Frederick, Warren	24 min
Oct 15, 10:17 AM EDT	Areal Flood Warning	LWX	Albemarle, Greene, Nelson	6 hr
Oct 15, 11:34 AM EDT	Special Marine Warning	LWX		56 min
Oct 15, 12:05 PM EDT	Special Marine Warning	LWX		55 min
Oct 15, 12:25 PM EDT	Tornado Warning	LWX	Arlington, Fairfax, City of Alexandria	13 min
Oct 15, 1:46 PM EDT	Special Marine Warning	LWX		59 min
Oct 15, 2:04 PM EDT	Special Marine Warning	LWX		56 min
Oct 15, 3:12 PM EDT	Special Marine Warning	LWX		93 min
Oct 15, 3:48 PM EDT	Special Marine Warning	LWX		87 min
Oct 15, 7:30 AM EDT	Coastal Flood Advisory	LWX	Anne Arundel	4 hr
Oct 15, 1:04 PM EDT	Tornado Warning	LWX	Anne Arundel, Howard, Prince George's	26 min

Nearby

Severe Thunderstorm Warnings in West Virginia, 2014 Severe Thunderstorm Warnings in Virginia, 2014 Every severe thunderstorm warning in 2014

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.