Alert archive / Maryland / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 243, NWS Baltimore/Washington

September 2, 20144 counties in Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Sep 2, 2014, 7:39 PM EDT for 4 counties in Maryland. It was in force for 51 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: Sep 2, 2014, 7:39 PM EDT (23:39 UTC)
Expired: Sep 2, 2014, 8:30 PM EDT
In force: 51 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon

Counties Anne Arundel County, MD, Baltimore County, MD, City of Baltimore, MD, Howard County, MD

The radar

The Sterling radar (KLWX), 76 km from the middle of the area, began a volume at 23:41 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
Sep 2, 4:39 PM EDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 11.7 hours before the alert went out and 56 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: 580 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 1226 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 116 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 Sep 2, 6:38 PM EDT, 1 hour 1 minute earlier.

Area forecast discussion, Sep 2, 6:38 PM EDT, 1 hour 1 minute before

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Hazardous weather outlook, Sep 2, 4:52 PM EDT, 2 hours 47 minutes before

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In the hours before

Local storm report, Sep 2, 4:10 PM EDT, 3 hours 29 minutes before

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Local storm report, Sep 2, 4:11 PM EDT, 3 hours 28 minutes before

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Local storm report, Sep 2, 5:08 PM EDT, 2 hours 31 minutes before

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Local storm report, Sep 2, 5:10 PM EDT, 2 hours 29 minutes before

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Local storm report, Sep 2, 6:06 PM EDT, 1 hour 33 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
Sep 2, 12:33 AM EDT	Special Marine Warning	LWX		57 min
Sep 2, 3:08 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Loudoun	52 min
Sep 2, 3:30 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	45 min
Sep 2, 3:52 PM EDT	Severe Thunderstorm Warning	LWX	Fairfax, Loudoun	38 min
Sep 2, 4:04 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	41 min
Sep 2, 4:49 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Loudoun	41 min
Sep 2, 5:11 PM EDT	Special Marine Warning	LWX		64 min
Sep 2, 6:20 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Loudoun	40 min
Sep 2, 6:29 PM EDT	Special Marine Warning	LWX		46 min
Sep 2, 6:46 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	44 min
Sep 2, 7:08 PM EDT	Special Marine Warning	LWX		52 min
Sep 2, 7:32 PM EDT	Special Marine Warning	LWX		58 min
Sep 2, 7:54 PM EDT	Special Marine Warning	LWX		51 min
Sep 2, 2:50 PM EDT	Severe Thunderstorm Warning	LWX	Allegany	40 min
Sep 2, 4:11 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery	49 min
Sep 2, 4:31 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Washington	44 min
Sep 2, 4:39 PM EDT	Severe Thunderstorm Warning	LWX	Howard, Montgomery, Prince George's	36 min
Sep 2, 5:15 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll, Frederick, Howard, Montgomery	45 min
Sep 2, 6:55 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Howard, Montgomery	35 min
Sep 2, 7:51 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Harford, City of Baltimore	39 min

Nearby

Severe Thunderstorm Warnings in Maryland, 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.