Alert archive / Maryland / Severe Thunderstorm Warnings in 2005

Severe Thunderstorm Warning 152, NWS Baltimore/Washington

November 29, 2005Frederick County, Montgomery County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Nov 29, 2005, 7:31 PM EST for Frederick County, Montgomery County, Maryland. It was in force for 89 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: Nov 29, 2005, 7:31 PM EST (00:31 UTC)
Expired: Nov 29, 2005, 9:00 PM EST
In force: 89 min
Issued by: NWS Baltimore/Washington
Area: Counties, with a storm outline in the text

Counties Frederick County, MD, Montgomery County, MD

The radar

The Sterling radar (KLWX), 40 km from the middle of the area, began a volume at 00:34 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
Nov 29, 6:04 PM EST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 0.5 hours before the alert went out and 40 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: 144 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 682 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 430 m²/s²
0-3 km storm-relative helicity: 513 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

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 Nov 29, 2:51 PM EST, 4 hours 40 minutes earlier.

Area forecast discussion, Nov 29, 2:51 PM EST, 4 hours 40 minutes before

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Hazardous weather outlook, Nov 29, 6:25 PM EST, 1 hour 6 minutes before

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In the hours before

Local storm report, Nov 29, 2:40 PM EST, 4 hours 51 minutes before

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Local storm report, Nov 29, 3:07 PM EST, 4 hours 24 minutes before

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Local storm report, Nov 29, 5:43 PM EST, 1 hour 48 minutes before

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Local storm report, Nov 29, 6:00 PM EST, 1 hour 31 minutes before

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Local storm report, Nov 29, 6:57 PM EST, 34 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
Nov 29, 7:05 PM EST	Special Marine Warning	LWX		115 min
Nov 29, 7:51 PM EST	Flash Flood Warning	LWX	Frederick	4 hr

Nearby

Severe Thunderstorm Warnings in Maryland, 2005 Every severe thunderstorm warning in 2005

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.