Alert archive / Virginia / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 40, NWS Baltimore/Washington

May 27, 2014Augusta County, Rockingham County, City of Staunton, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at May 27, 2014, 1:45 PM EDT for Augusta County, Rockingham County, City of Staunton, Virginia. It was in force for 45 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: May 27, 2014, 1:45 PM EDT (17:45 UTC)
Expired: May 27, 2014, 2:30 PM EDT
In force: 45 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon

Counties Augusta County, VA, City of Staunton, VA, Rockingham County, VA

The radar

The Sterling radar (KLWX), 155 km from the middle of the area, began a volume at 17:46 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 12:00Z, 5.8 hours before the alert went out and 127 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: 195 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 731 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 56 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 Baltimore/Washington wrote its last area forecast discussion before this severe thunderstorm warning went out at May 27, 10:42 AM EDT, 3 hours 3 minutes earlier.

Area forecast discussion, May 27, 10:42 AM EDT, 3 hours 3 minutes before

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Hazardous weather outlook, May 27, 11:26 AM EDT, 2 hours 19 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
May 27, 1:34 PM EDT	Small Craft Advisory	LWX		46 hr
May 27, 5:25 PM EDT	Special Marine Warning	LWX		35 min
May 27, 5:39 PM EDT	Special Marine Warning	LWX		66 min
May 27, 5:44 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax, Loudoun	46 min
May 27, 5:56 PM EDT	Special Marine Warning	LWX		34 min
May 27, 6:26 PM EDT	Special Marine Warning	LWX		94 min
May 27, 6:33 PM EDT	Special Marine Warning	LWX		42 min
May 27, 7:10 PM EDT	Severe Thunderstorm Warning	LWX	Arlington, City of Alexandria	35 min
May 27, 7:14 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax, Fauquier, Loudoun, Prince William, City of Manassas, City of Manassas Park	46 min
May 27, 7:18 PM EDT	Special Marine Warning	LWX		87 min
May 27, 7:46 PM EDT	Special Marine Warning	LWX		89 min
May 27, 4:20 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	25 min
May 27, 4:40 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll, Frederick, Howard, Montgomery	50 min
May 27, 6:18 PM EDT	Severe Thunderstorm Warning	LWX	Howard, Montgomery, Prince George's	42 min
May 27, 7:37 PM EDT	Severe Thunderstorm Warning	LWX	Calvert, Prince George's	53 min

Nearby

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.