Alert archive / Maryland / Special Weather Statements in 2011

Special Weather Statement, NWS Baltimore/Washington

May 4, 2011Montgomery County, Maryland

NWS Baltimore/Washington issued this special weather statement at May 4, 2011, 5:13 PM EDT for Montgomery County, Maryland. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 4, 2011, 5:13 PM EDT (21:13 UTC)
Expired: May 4, 2011, 5:45 PM EDT
In force: 32 min
Issued by: NWS Baltimore/Washington

County Montgomery County, MD

The radar

The Sterling radar (KLWX), 23 km from the middle of the area, began a volume at 21:15 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, 9.2 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 551 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: -92 m²/s²
0-3 km storm-relative helicity: 148 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 3, 8:37 PM EDT	Special Weather Statement	LWX	Greene	23 min
May 3, 8:41 PM EDT	Special Weather Statement	LWX	Albemarle, City of Charlottesville	34 min
May 3, 9:08 PM EDT	Special Weather Statement	LWX	Albemarle	37 min
May 3, 9:59 PM EDT	Special Marine Warning	LWX		91 min
May 3, 10:12 PM EDT	Special Marine Warning	LWX		93 min
May 4, 4:03 AM EDT	Small Craft Advisory	LWX		39 hr
May 4, 5:48 AM EDT	Special Marine Warning	LWX		57 min
May 4, 8:38 AM EDT	Special Marine Warning	LWX		39 min
May 4, 12:50 PM EDT	Freeze Warning	LWX	Highland	19 hr
May 4, 5:24 PM EDT	Special Weather Statement	LWX		36 min
May 4, 5:35 PM EDT	Special Weather Statement	LWX	Loudoun	25 min
May 4, 12:50 PM EDT	Frost Advisory	LWX	Allegany	19 hr
May 4, 5:09 PM EDT	Special Weather Statement	LWX	Berkeley, Jefferson	36 min

Nearby

Special Weather Statements in Maryland, 2011 Every special weather statement 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.