Alert archive / Virginia / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 89, NWS Baltimore/Washington

June 16, 20164 counties in Virginia; Charles County, Saint Mary's County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Jun 16, 2016, 9:12 PM EDT for 4 counties in Virginia; Charles County, Saint Mary's County, Maryland. It was in force for 48 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: Jun 16, 2016, 9:12 PM EDT (01:12 UTC)
Expired: Jun 16, 2016, 10:00 PM EDT
In force: 48 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Charles County, MD, Saint Mary's County, MD, City of Fredericksburg, VA, King George County, VA, Spotsylvania County, VA, Stafford County, VA

The radar

The Sterling radar (KLWX), 78 km from the middle of the area, began a volume at 01:14 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
Jun 16, 1:58 PM EDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 1.2 hours before the alert went out and 73 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: 876 J/kg
Mixed-layer CIN: -9 J/kg
Mixed-layer LCL: 797 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

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 Jun 16, 8:19 PM EDT, 53 minutes earlier.

Area forecast discussion, Jun 16, 8:19 PM EDT, 53 minutes before

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Hazardous weather outlook, Jun 16, 9:04 PM EDT, 8 minutes before

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In the hours before

Local storm report, Jun 16, 8:28 PM EDT, 44 minutes before

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Local storm report, Jun 16, 8:40 PM EDT, 32 minutes before

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Local storm report, Jun 16, 8:52 PM EDT, 20 minutes before

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Local storm report, Jun 16, 9:03 PM EDT, 9 minutes before

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Local storm report, Jun 16, 9:05 PM EDT, 7 minutes before

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Local storm report, Jun 16, 9:09 PM EDT, 3 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
Jun 16, 8:06 PM EDT	Flash Flood Warning	LWX	Orange	4 hr
Jun 16, 8:10 PM EDT	Special Marine Warning	LWX		2 hr
Jun 16, 8:20 PM EDT	Severe Thunderstorm Warning	LWX	Arlington, Fairfax, Fauquier, Loudoun, Prince William, Stafford and 5 more	40 min
Jun 16, 8:35 PM EDT	Severe Thunderstorm Warning	LWX	Culpeper, Fauquier, King George, Madison, Orange, Prince William and 3 more	40 min
Jun 16, 8:42 PM EDT	Severe Thunderstorm Warning	LWX	Nelson	33 min
Jun 16, 8:54 PM EDT	Special Marine Warning	LWX		96 min
Jun 16, 8:59 PM EDT	Special Marine Warning	LWX		2 hr
Jun 16, 9:17 PM EDT	Special Marine Warning	LWX		118 min
Jun 16, 10:10 PM EDT	Special Marine Warning	LWX		95 min
Jun 16, 11:32 PM EDT	Special Marine Warning	LWX		88 min
Jun 16, 8:51 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Calvert, Charles, Montgomery, Prince George's, Saint Mary's	71 min
Jun 17, 7:24 PM EDT	Coastal Flood Advisory	LWX	Anne Arundel, Saint Mary's	10 hr

Nearby

Severe Thunderstorm Warnings in Virginia, 2016 Severe Thunderstorm Warnings in Maryland, 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.