Alert archive / Virginia / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 192, NWS Baltimore/Washington

July 18, 2016Orange County, Spotsylvania County, Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Jul 18, 2016, 5:28 PM EDT for Orange County, Spotsylvania County, Virginia. It was in force for 47 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 18, 2016, 5:28 PM EDT (21:28 UTC)
Expired: Jul 18, 2016, 6:15 PM EDT
In force: 47 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Orange County, VA, Spotsylvania County, VA

The radar

The Sterling radar (KLWX), 90 km from the middle of the area, began a volume at 21:32 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jul 18, 1:42 PM EDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 12:00Z, 9.5 hours before the alert went out and 90 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: 200 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1480 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 4 m²/s²
0-3 km storm-relative helicity: 18 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 Jul 18, 2:55 PM EDT, 2 hours 33 minutes earlier.

Area forecast discussion, Jul 18, 2:55 PM EDT, 2 hours 33 minutes before

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Hazardous weather outlook, Jul 18, 5:07 PM EDT, 21 minutes before

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In the hours before

Local storm report, Jul 18, 5:19 PM EDT, 9 minutes before

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Local storm report, Jul 18, 5:22 PM EDT, 6 minutes before

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Local storm report, Jul 18, 5:24 PM EDT, 4 minutes before

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Local storm report, Jul 18, 5:26 PM EDT, 2 minutes before

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Local storm report, Jul 18, 5:27 PM EDT, 1 minute before

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Local storm report, Jul 18, 5:28 PM EDT, 0 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
Jul 18, 1:24 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	36 min
Jul 18, 1:53 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	37 min
Jul 18, 2:23 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Frederick, Loudoun, Shenandoah, Warren, City of Winchester	52 min
Jul 18, 2:31 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier, Madison, Page, Rappahannock, Rockingham, Shenandoah and 1 more	44 min
Jul 18, 3:01 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Fauquier, Loudoun, Prince William, Warren	27 min
Jul 18, 3:07 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Fauquier, Madison, Rappahannock	38 min
Jul 18, 3:27 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	18 min
Jul 18, 3:30 PM EDT	Special Marine Warning	LWX		90 min
Jul 18, 3:30 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Fauquier, Orange, Prince William, Spotsylvania, Stafford	45 min
Jul 18, 3:41 PM EDT	Special Marine Warning	LWX		94 min
Jul 18, 3:45 PM EDT	Severe Thunderstorm Warning	LWX	Arlington, Fairfax, Fauquier, Loudoun, Prince William, City of Fairfax and 3 more	45 min
Jul 18, 4:05 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax, King George, Prince William, Stafford	40 min
Jul 18, 4:08 PM EDT	Severe Thunderstorm Warning	LWX	Arlington, Fairfax, City of Alexandria, City of Falls Church	82 min
Jul 18, 4:10 PM EDT	Special Marine Warning	LWX		2 hr
Jul 18, 4:30 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Greene, Madison, Orange	45 min
Jul 18, 4:46 PM EDT	Special Marine Warning	LWX		89 min
Jul 18, 4:56 PM EDT	Special Marine Warning	LWX		2 hr
Jul 18, 5:09 PM EDT	Special Marine Warning	LWX		36 min
Jul 18, 3:37 PM EDT	Areal Flood Warning	LWX	Baltimore, Harford	6 hr
Jul 18, 3:38 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll, Harford	52 min
Jul 18, 5:49 PM EDT	Severe Thunderstorm Warning	LWX	Saint Mary's	15 min

Nearby

Severe Thunderstorm Warnings in Virginia, 2016 Every severe thunderstorm warning in 2016

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.