Alert archive / Virginia / Flash Flood Warnings in 2014

Flash Flood Warning 11, NWS Baltimore/Washington

May 16, 20145 counties in Virginia; Montgomery County, Maryland

NWS Baltimore/Washington issued this flash flood warning at May 16, 2014, 7:11 AM EDT for 5 counties in Virginia; Montgomery County, Maryland. It was in force for 3 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: May 16, 2014, 7:11 AM EDT (11:11 UTC)
Expired: May 16, 2014, 10:15 AM EDT
In force: 3 hr
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Flood severity: None

Counties Montgomery County, MD, Arlington County, VA, City of Alexandria, VA, City of Fairfax, VA, City of Falls Church, VA, Fairfax County, VA

The radar

The Sterling radar (KLWX), 28 km from the middle of the area, began a volume at 11:14 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, 11.2 hours before the alert went out and 20 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: 128 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 735 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 183 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

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 May 16, 7:01 AM EDT, 10 minutes earlier.

Area forecast discussion, May 16, 7:01 AM EDT, 10 minutes before

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Hazardous weather outlook, May 16, 7:04 AM EDT, 7 minutes before

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In the hours before

Local storm report, May 16, 4:47 AM EDT, 2 hours 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
447 AM EDT FRI MAY 16 2014

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

0425 AM     FLOOD            EMMITSBURG              39.70N  77.33W
05/16/2014                   FREDERICK          MD   FIRE DEPT/RESCUE

            THE INTERSECTION OF ANNANDALE AND HAMPTON VALLEY ROAD
            WAS CLOSED DUE TO HIGH WATER.

&&

EVENT NUMBER LWX1400223

BJL

Local storm report, May 16, 6:38 AM EDT, 33 minutes before

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Local storm report, May 16, 6:48 AM EDT, 23 minutes before

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Local storm report, May 16, 6:58 AM EDT, 13 minutes before

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Local storm report, May 16, 7:03 AM EDT, 8 minutes before

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Local storm report, May 16, 7:06 AM EDT, 5 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 15, 8:23 PM EDT	Special Marine Warning	LWX		112 min
May 15, 10:08 PM EDT	Areal Flood Warning	LWX	Arlington, Fairfax, Prince William, Stafford, City of Fairfax, City of Falls Church	20 hr
May 15, 10:42 PM EDT	Areal Flood Warning	LWX	Albemarle, Augusta, Greene, Nelson, Orange, Rockingham and 2 more	16 hr
May 16, 12:01 AM EDT	Areal Flood Warning	LWX	Culpeper, Greene, Madison, Orange, Page, Rappahannock and 2 more	29 hr
May 16, 12:06 AM EDT	Areal Flood Warning	LWX	Frederick, Page, Rockingham, Shenandoah, Warren	28 hr
May 16, 12:46 AM EDT	Areal Flood Warning	LWX	Fairfax, Loudoun, Prince William, City of Manassas, City of Manassas Park	36 hr
May 16, 1:17 AM EDT	Areal Flood Warning	LWX	Frederick, Shenandoah, City of Winchester	36 hr
May 16, 2:04 AM EDT	Areal Flood Warning	LWX	Clarke, Loudoun, Warren	18 hr
May 16, 2:54 AM EDT	Flash Flood Warning	LWX	Clarke, Fauquier, Loudoun, Rappahannock, Warren	3 hr
May 16, 3:16 AM EDT	Areal Flood Warning	LWX	Culpeper, Fauquier, Loudoun, Orange, Prince William	12 hr
May 16, 3:34 AM EDT	Tornado Warning	LWX	Fauquier, Loudoun	26 min
May 16, 4:20 AM EDT	Small Craft Advisory	LWX		13 hr
May 16, 4:52 AM EDT	River Flood Warning	LWX	Culpeper, Orange, Spotsylvania	28 hr
May 16, 5:00 AM EDT	Areal Flood Warning	LWX	Arlington, Fairfax, City of Alexandria, City of Falls Church	17 hr
May 16, 6:28 AM EDT	River Flood Warning	LWX	Spotsylvania, Stafford, City of Fredericksburg	34 hr
May 16, 6:28 AM EDT	River Flood Warning	LWX	Stafford, City of Fredericksburg	34 hr
May 16, 6:51 AM EDT	River Flood Warning	LWX	Loudoun	23 hr
May 16, 6:59 AM EDT	Coastal Flood Warning	LWX	Arlington, City of Alexandria, City of Falls Church	5 hr
May 16, 7:54 AM EDT	River Flood Warning	LWX	Warren	33 hr
May 16, 8:00 AM EDT	River Flood Warning	LWX	Page	34 hr
May 16, 8:37 AM EDT	Special Marine Warning	LWX		38 min
May 16, 9:48 AM EDT	River Flood Warning	LWX	Clarke, Warren	68 hr
May 16, 9:54 AM EDT	River Flood Warning	LWX	Loudoun	68 hr
May 16, 9:54 AM EDT	River Flood Warning	LWX	Fairfax, Loudoun	65 hr
May 16, 11:56 AM EDT	Coastal Flood Watch	LWX	Arlington, City of Alexandria, City of Falls Church	7 hr
May 16, 3:22 PM EDT	Areal Flood Warning	LWX	Culpeper, Fauquier, Loudoun, Orange, Prince William	6 hr
May 16, 3:59 PM EDT	River Flood Warning	LWX	Shenandoah, Warren	16 hr
May 16, 6:27 PM EDT	Coastal Flood Warning	LWX	Arlington, City of Alexandria, City of Falls Church	46 hr
May 15, 11:26 PM EDT	River Flood Warning	LWX	Montgomery	34 hr
May 15, 11:31 PM EDT	River Flood Watch	LWX	Frederick	6 hr
May 16, 4:17 AM EDT	River Flood Warning	LWX	Frederick	42 hr
May 16, 4:48 AM EDT	River Flood Warning	LWX	Washington	33 hr
May 16, 6:23 AM EDT	Areal Flood Warning	LWX	Anne Arundel, Baltimore, Harford, Howard, Prince George's, City of Baltimore	12 hr
May 16, 8:20 AM EDT	River Flood Watch	LWX	Washington	115 min
May 16, 9:35 AM EDT	River Flood Warning	LWX	Washington	36 hr
May 16, 9:50 AM EDT	River Flood Warning	LWX	Allegany	31 hr
May 16, 9:51 AM EDT	River Flood Warning	LWX	Washington	43 hr
May 16, 9:53 AM EDT	River Flood Warning	LWX	Washington	40 hr
May 15, 11:05 PM EDT	Areal Flood Warning	LWX	Grant, Hardy, Pendleton	14 hr
May 15, 11:47 PM EDT	River Flood Watch	LWX	Grant, Hardy	7 hr
May 16, 2:17 AM EDT	River Flood Warning	LWX	Pendleton	23 hr
May 16, 4:06 AM EDT	River Flood Warning	LWX	Grant, Hardy	18 hr
May 16, 4:14 AM EDT	River Flood Warning	LWX	Berkeley, Jefferson	34 hr
May 16, 9:34 AM EDT	River Flood Warning	LWX	Hardy	11 hr

Nearby

Flash Flood Warnings in Virginia, 2014 Flash Flood Warnings in Maryland, 2014 Every flash flood warning in 2014

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.