Alert archive / West Virginia / Severe Thunderstorm Warnings in 2016

Severe Thunderstorm Warning 133, NWS Baltimore/Washington

June 21, 2016Frederick County, Washington County, Maryland; Berkeley County, Jefferson County, Morgan County, West Virginia

NWS Baltimore/Washington issued this severe thunderstorm warning at Jun 21, 2016, 8:19 PM EDT for Frederick County, Washington County, Maryland; Berkeley County, Jefferson County, Morgan County, West Virginia. It was in force for 41 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 21, 2016, 8:19 PM EDT (00:19 UTC)
Expired: Jun 21, 2016, 9:00 PM EDT
In force: 41 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Frederick County, MD, Washington County, MD, Berkeley County, WV, Jefferson County, WV, Morgan County, WV

The radar

The Sterling radar (KLWX), 65 km from the middle of the area, began a volume at 00:19 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 21, 1:06 PM EDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.3 hours before the alert went out and 72 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: 677 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 1204 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 21, 8:16 PM EDT, 3 minutes earlier.

Area forecast discussion, Jun 21, 8:16 PM EDT, 3 minutes before

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Hazardous weather outlook, Jun 21, 6:42 PM EDT, 1 hour 37 minutes before

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In the hours before

Local storm report, Jun 21, 7:03 PM EDT, 1 hour 16 minutes before

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Local storm report, Jun 21, 7:08 PM EDT, 1 hour 11 minutes before

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Local storm report, Jun 21, 7:49 PM EDT, 30 minutes before

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Local storm report, Jun 21, 7:50 PM EDT, 29 minutes before

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Local storm report, Jun 21, 7:51 PM EDT, 28 minutes before

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Local storm report, Jun 21, 8:01 PM EDT, 18 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 21, 8:23 PM EDT	Special Marine Warning	LWX		2 hr
Jun 21, 8:38 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	37 min
Jun 22, 1:18 AM EDT	Small Craft Advisory	LWX		17 hr
Jun 22, 3:57 AM EDT	Flash Flood Watch	LWX	Albemarle, Amherst, Augusta, Clarke, Frederick, Greene and 11 more	42 hr
Jun 22, 1:28 PM EDT	Small Craft Advisory	LWX		27 hr
Jun 21, 8:22 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Howard, Montgomery, Prince George's	9 min

Nearby

Severe Thunderstorm Warnings in West 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.