Alert archive / Maryland / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 114, NWS Baltimore/Washington

May 19, 2011Baltimore County, Harford County, Maryland

NWS Baltimore/Washington issued this severe thunderstorm warning at May 19, 2011, 4:34 PM EDT for Baltimore County, Harford County, Maryland. 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: May 19, 2011, 4:34 PM EDT (20:34 UTC)
Expired: May 19, 2011, 5:15 PM EDT
In force: 41 min
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon

Counties Baltimore County, MD, Harford County, MD

The radar

The Sterling radar (KLWX), 105 km from the middle of the area, began a volume at 20:34 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 nearest sounding before it

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 8.6 hours before the alert went out and 31 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: 143 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 819 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: -13 m²/s²
0-3 km storm-relative helicity: 53 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.1

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 May 19, 3:31 PM EDT, 1 hour 3 minutes earlier.

Area forecast discussion, May 19, 3:31 PM EDT, 1 hour 3 minutes before

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Hazardous weather outlook, May 19, 3:43 PM EDT, 51 minutes before

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In the hours before

Special weather statement, May 19, 3:42 PM EDT, 52 minutes before

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Local storm report, May 19, 3:49 PM EDT, 45 minutes before

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Special weather statement, May 19, 4:02 PM EDT, 32 minutes before

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Special weather statement, May 19, 4:02 PM EDT, 32 minutes before

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Special weather statement, May 19, 4:15 PM EDT, 19 minutes before

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Local storm report, May 19, 4:28 PM EDT, 6 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
May 18, 9:05 PM EDT	Special Weather Statement	LWX	Rappahannock, Warren	25 min
May 18, 10:38 PM EDT	Special Marine Warning	LWX		82 min
May 19, 4:36 AM EDT	Flash Flood Watch	LWX	Arlington, Clarke, Culpeper, Fairfax, Fauquier, Frederick and 22 more	14 hr
May 19, 12:49 PM EDT	Special Marine Warning	LWX		56 min
May 19, 1:13 PM EDT	Special Marine Warning	LWX		92 min
May 19, 3:04 PM EDT	Special Marine Warning	LWX		56 min
May 19, 3:25 PM EDT	Special Marine Warning	LWX		95 min
May 19, 3:56 PM EDT	Special Marine Warning	LWX		94 min
May 19, 4:57 PM EDT	Special Weather Statement	LWX	King George	33 min
May 19, 5:16 PM EDT	Special Marine Warning	LWX		68 min
May 19, 6:46 PM EDT	Special Marine Warning	LWX		57 min
May 19, 6:49 PM EDT	Special Marine Warning	LWX		74 min
May 18, 8:47 PM EDT	Special Weather Statement	LWX	Allegany	28 min
May 18, 10:42 PM EDT	Special Weather Statement	LWX	Frederick	18 min
May 19, 1:56 AM EDT	Special Weather Statement	LWX	Harford	34 min
May 19, 12:22 PM EDT	Flash Flood Warning	LWX	Baltimore	3 hr
May 19, 1:27 PM EDT	Special Weather Statement	LWX	City of Baltimore	33 min
May 19, 3:07 PM EDT	Special Weather Statement	LWX	Anne Arundel	38 min
May 19, 3:42 PM EDT	Special Weather Statement	LWX	Anne Arundel	33 min
May 19, 4:02 PM EDT	Special Weather Statement	LWX	City of Baltimore	28 min
May 19, 4:15 PM EDT	Special Weather Statement	LWX	Baltimore, Harford, City of Baltimore	30 min
May 19, 5:15 PM EDT	Special Weather Statement	LWX	Harford	30 min
May 19, 6:17 PM EDT	Special Weather Statement	LWX	City of Baltimore	28 min
May 19, 6:41 PM EDT	Special Weather Statement	LWX	City of Baltimore	34 min
May 19, 6:55 PM EDT	Special Weather Statement	LWX	Frederick	35 min
May 19, 7:15 PM EDT	Special Weather Statement	LWX	Montgomery	30 min
May 19, 7:22 PM EDT	Severe Thunderstorm Warning	LWX	Frederick, Howard, Montgomery	38 min
May 18, 8:17 PM EDT	Special Weather Statement	LWX	Morgan	28 min
May 18, 8:49 PM EDT	Special Weather Statement	LWX	Grant	26 min

Nearby

Severe Thunderstorm Warnings in Maryland, 2011 Every severe thunderstorm warning in 2011

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.