Alert archive / Maryland / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 209, NWS Baltimore/Washington

July 29, 2007Harford County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at Jul 29, 2007, 5:44 AM EDT for Harford County, Maryland. It was in force for 46 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 29, 2007, 5:44 AM EDT (09:44 UTC)
Expired: Jul 29, 2007, 6:30 AM EDT
In force: 46 min
Issued by: NWS Baltimore/Washington
Area: Counties, with a storm outline in the text

County Harford County, MD

The nearest sounding before it

Washington/Dulle, VA (KIAD), launched 00:00Z, 9.7 hours before the alert went out and 115 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: 1434 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1642 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 33 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 29, 4:02 AM EDT, 1 hour 42 minutes earlier.

Area forecast discussion, Jul 29, 4:02 AM EDT, 1 hour 42 minutes before

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Hazardous weather outlook, Jul 29, 4:58 AM EDT, 46 minutes before

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In the hours before

Special weather statement, Jul 28, 11:47 PM EDT, 5 hours 57 minutes before

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Local storm report, Jul 29, 1:50 AM EDT, 3 hours 54 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 28, 10:11 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	79 min
Jul 29, 5:49 AM EDT	Special Marine Warning	LWX		86 min
Jul 29, 1:36 PM EDT	Special Marine Warning	LWX		54 min
Jul 29, 2:09 PM EDT	Special Marine Warning	LWX		2 hr
Jul 29, 2:25 PM EDT	Special Marine Warning	LWX		2 hr
Jul 29, 3:29 PM EDT	Special Marine Warning	LWX		54 min
Jul 29, 3:35 PM EDT	Severe Thunderstorm Warning	LWX	Stafford	40 min
Jul 29, 4:09 PM EDT	Special Marine Warning	LWX		2 hr
Jul 29, 4:26 PM EDT	Severe Thunderstorm Warning	LWX	Loudoun	64 min
Jul 29, 4:44 PM EDT	Severe Thunderstorm Warning	LWX	King George	46 min
Jul 29, 4:47 PM EDT	Severe Thunderstorm Warning	LWX	Spotsylvania, City of Fredericksburg	58 min
Jul 29, 5:29 PM EDT	Severe Thunderstorm Warning	LWX	Clarke, Frederick, Loudoun, City of Winchester	48 min
Jul 29, 5:32 PM EDT	Severe Thunderstorm Warning	LWX	King George	43 min
Jul 29, 5:34 PM EDT	Flash Flood Warning	LWX	Spotsylvania, Stafford, City of Fredericksburg	3 hr
Jul 29, 5:44 PM EDT	Severe Thunderstorm Warning	LWX	Orange	46 min
Jul 29, 6:20 PM EDT	Severe Thunderstorm Warning	LWX	Augusta	26 min
Jul 29, 6:32 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, City of Charlottesville	43 min
Jul 28, 9:29 PM EDT	Severe Thunderstorm Warning	LWX	Washington	46 min
Jul 29, 1:21 PM EDT	Severe Thunderstorm Warning	LWX	Prince George's	54 min
Jul 29, 2:33 PM EDT	Severe Thunderstorm Warning	LWX	Charles	57 min
Jul 29, 3:01 PM EDT	Severe Thunderstorm Warning	LWX	Prince George's	44 min
Jul 29, 3:10 PM EDT	Flash Flood Warning	LWX	Charles	3 hr
Jul 29, 4:29 PM EDT	Severe Thunderstorm Warning	LWX	Montgomery	76 min
Jul 29, 5:21 PM EDT	Severe Thunderstorm Warning	LWX	Frederick	54 min
Jul 29, 6:29 PM EDT	Severe Thunderstorm Warning	LWX	Carroll	76 min
Jul 29, 6:41 PM EDT	Severe Thunderstorm Warning	LWX	Washington	37 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2007 Every severe thunderstorm warning in 2007

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.