Alert archive / Maryland / Flash Flood Warnings in 2006

Flash Flood Warning 40, NWS Baltimore/Washington

June 25, 2006Montgomery County, Maryland

NWS Baltimore/Washington issued this flash flood warning at Jun 25, 2006, 10:51 PM EDT for Montgomery County, Maryland. It was in force for 4 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: Jun 25, 2006, 10:51 PM EDT (02:51 UTC)
Expired: Jun 26, 2006, 2:45 AM EDT
In force: 4 hr
Issued by: NWS Baltimore/Washington
Area: Whole counties

County Montgomery County, MD

The radar

The Sterling radar (KLWX), 30 km from the middle of the area, began a volume at 02:51 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 00:00Z, 2.9 hours before the alert went out and 27 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: 494 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 720 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 93 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Jun 25, 10:16 PM EDT, 35 minutes earlier.

Area forecast discussion, Jun 25, 10:16 PM EDT, 35 minutes before

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Hazardous weather outlook, Jun 25, 10:45 PM EDT, 6 minutes before

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In the hours before

Local storm report, Jun 25, 9:51 PM EDT, 1 hour before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
951 PM EDT SUN JUN 25 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0848 PM     FLASH FLOOD      STERLING                39.01N 77.43W
06/25/2006                   LOUDOUN            VA   OTHER FEDERAL

            DULLES AIRPORT REPORTED WATER RESCUES ON ACCESS ROADS AND
            COMMERICAL PARKING LOTS

0945 PM     FLASH FLOOD      WASHINGTON              38.91N 77.02W
06/25/2006                   DISTRICT OF COLUMB DC   FIRE DEPT/RESCUE

            WASHINGTON FIRE REPORTED SEVERAL ROADS CLOSED DUE TO
            FLASH FLOODING IN NORTHEAST

&&

ROGOWSKI

Local storm report, Jun 25, 10:24 PM EDT, 27 minutes before

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Local storm report, Jun 25, 10:37 PM EDT, 14 minutes before

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Local storm report, Jun 25, 10:49 PM EDT, 2 minutes before

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Local storm report, Jun 25, 10:50 PM EDT, 1 minute before

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Local storm report, Jun 25, 10:51 PM EDT, 0 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
Jun 25, 8:51 PM EDT	Flash Flood Warning	LWX	Arlington, City of Alexandria, City of Falls Church	4 hr
Jun 25, 11:43 PM EDT	Flash Flood Warning	LWX	Highland	4 hr
Jun 26, 12:26 AM EDT	Flash Flood Warning	LWX	Arlington, City of Alexandria, City of Falls Church	3 hr
Jun 26, 3:44 AM EDT	Flash Flood Warning	LWX	Highland	3 hr
Jun 26, 6:41 AM EDT	Coastal Flood Statement	LWX	Arlington, Fairfax, King George, Stafford, City of Alexandria, City of Fairfax and 1 more	109 min
Jun 26, 8:30 AM EDT	Coastal Flood Warning	LWX	Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church	4 hr
Jun 26, 9:34 AM EDT	Flash Flood Warning	LWX	Augusta, Highland, City of Staunton, City of Waynesboro	6 hr
Jun 26, 10:49 AM EDT	Flash Flood Warning	LWX	Rockingham, City of Harrisonburg	4 hr
Jun 26, 11:09 AM EDT	Flash Flood Warning	LWX	Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church	6 hr
Jun 26, 12:13 PM EDT	Flash Flood Warning	LWX	Fauquier, Prince William, City of Manassas, City of Manassas Park	6 hr
Jun 26, 1:06 PM EDT	Flash Flood Warning	LWX	Culpeper, Orange, Spotsylvania, Stafford, City of Fredericksburg	6 hr
Jun 26, 1:17 PM EDT	Flash Flood Warning	LWX	Loudoun	3 hr
Jun 26, 2:22 PM EDT	Flash Flood Warning	LWX	Nelson	6 hr
Jun 26, 4:56 PM EDT	Flash Flood Warning	LWX	Arlington, Fairfax, City of Alexandria, City of Fairfax, City of Falls Church	6 hr
Jun 26, 5:39 PM EDT	Special Marine Warning	LWX		96 min
Jun 26, 6:08 PM EDT	Flash Flood Warning	LWX	Prince William, City of Manassas, City of Manassas Park	6 hr
Jun 25, 8:16 PM EDT	Flash Flood Warning	LWX	Baltimore, City of Baltimore	4 hr
Jun 25, 10:13 PM EDT	Flash Flood Warning	LWX	Harford	3 hr
Jun 25, 10:14 PM EDT	Flash Flood Warning	LWX	Prince George's	3 hr
Jun 25, 11:04 PM EDT	Flash Flood Warning	LWX	Howard	4 hr
Jun 26, 1:01 AM EDT	Flash Flood Warning	LWX	Harford	119 min
Jun 26, 2:32 AM EDT	Flash Flood Warning	LWX	Allegany	4 hr
Jun 26, 4:37 AM EDT	Flash Flood Warning	LWX	Washington	3 hr
Jun 26, 11:15 AM EDT	Flash Flood Warning	LWX	Anne Arundel	4 hr
Jun 26, 11:31 AM EDT	Flash Flood Warning	LWX	Baltimore, Harford, City of Baltimore	6 hr
Jun 26, 1:16 PM EDT	Flash Flood Warning	LWX	Howard	6 hr
Jun 26, 3:34 PM EDT	Flash Flood Warning	LWX	Carroll	6 hr
Jun 26, 7:09 PM EDT	Flash Flood Warning	LWX	Howard	6 hr

Nearby

Flash Flood Warnings in Maryland, 2006 Every flash flood warning in 2006

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.