Alert archive / Maryland / Red Flag Warnings in 2010

Red Flag Warning 3, NWS Baltimore/Washington

April 16, 20104 counties in Virginia; 8 counties in Maryland

NWS Baltimore/Washington issued this red flag warning at Apr 16, 2010, 1:32 PM EDT for 4 counties in Virginia; 8 counties in Maryland. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Apr 16, 2010, 1:32 PM EDT (17:32 UTC)
Expired: Apr 16, 2010, 8:00 PM EDT
In force: 6 hr
Issued by: NWS Baltimore/Washington

Counties Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Carroll County, MD, City of Baltimore, MD, Frederick County, MD, Saint Mary's County, MD, Washington County, MD, Augusta County, VA, City of Harrisonburg, VA, City of Staunton, VA, Rockingham County, VA

The radar

The Sterling radar (KLWX), 15 km from the middle of the area, began a volume at 17:31 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 5.5 hours before the alert went out and 19 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: 5 J/kg
Mixed-layer CIN: -200 J/kg
Mixed-layer LCL: 2381 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 168 m²/s²
0-3 km storm-relative helicity: 162 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 red flag 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 red flag warning went out at Apr 16, 10:26 AM EDT, 3 hours 6 minutes earlier.

Area forecast discussion, Apr 16, 10:26 AM EDT, 3 hours 6 minutes before

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Hazardous weather outlook, Apr 16, 10:34 AM EDT, 2 hours 58 minutes before

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In the hours before

Special weather statement, Apr 16, 8:47 AM EDT, 4 hours 45 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
Apr 16, 3:21 AM EDT	Small Craft Advisory	LWX		69 hr
Apr 16, 4:26 PM EDT	Special Marine Warning	LWX		2 hr
Apr 16, 5:27 PM EDT	Special Weather Statement	LWX	Frederick	93 min
Apr 16, 6:16 PM EDT	Special Weather Statement	LWX	Arlington, Clarke, Culpeper, Fairfax, Fauquier, Loudoun and 9 more	74 min
Apr 16, 6:20 PM EDT	Special Weather Statement	LWX	Arlington, Clarke, Culpeper, Fairfax, Fauquier, Loudoun and 9 more	70 min
Apr 16, 6:24 PM EDT	Special Marine Warning	LWX		111 min
Apr 16, 6:49 PM EDT	Special Marine Warning	LWX		86 min
Apr 16, 7:14 PM EDT	Special Marine Warning	LWX		108 min
Apr 16, 7:21 PM EDT	Special Weather Statement	LWX	King George, Stafford	84 min
Apr 16, 3:44 PM EDT	Special Weather Statement	LWX	Frederick, Washington	61 min
Apr 16, 4:17 PM EDT	Special Weather Statement	LWX	Baltimore, Carroll, Frederick, Howard	58 min
Apr 16, 4:28 PM EDT	Severe Thunderstorm Warning	LWX	Carroll, Frederick, Howard, Montgomery	32 min
Apr 16, 4:51 PM EDT	Special Weather Statement	LWX	Baltimore, Harford	54 min
Apr 16, 4:55 PM EDT	Severe Thunderstorm Warning	LWX	Anne Arundel, Baltimore, Carroll, Harford, Howard, Montgomery and 1 more	50 min
Apr 16, 6:30 PM EDT	Severe Thunderstorm Warning	LWX	Baltimore, Carroll, Frederick	30 min
Apr 16, 6:56 PM EDT	Special Weather Statement	LWX	Baltimore, Harford, City of Baltimore	64 min
Apr 16, 7:01 PM EDT	Special Weather Statement	LWX	Allegany, Washington	74 min

Nearby

Red Flag Warnings in Maryland, 2010 Red Flag Warnings in Virginia, 2010 Red Flag Warnings in West Virginia, 2010 Every red flag warning in 2010

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.