Alert archive / Virginia / Flash Flood Warnings in 2014

Flash Flood Warning 12, NWS Baltimore/Washington

May 28, 2014Spotsylvania County, Virginia

NWS Baltimore/Washington issued this flash flood warning at May 28, 2014, 6:12 PM EDT for Spotsylvania County, Virginia. 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 28, 2014, 6:12 PM EDT (22:12 UTC)
Expired: May 28, 2014, 9:15 PM EDT
In force: 3 hr
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Flood severity: None

County Spotsylvania County, VA

The radar

The Sterling radar (KLWX), 89 km from the middle of the area, began a volume at 22:12 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, 10.2 hours before the alert went out and 88 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: 105 J/kg
Mixed-layer CIN: -125 J/kg
Mixed-layer LCL: 1083 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 158 m²/s²
0-3 km storm-relative helicity: 139 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 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 28, 3:07 PM EDT, 3 hours 5 minutes earlier.

Area forecast discussion, May 28, 3:07 PM EDT, 3 hours 5 minutes before

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Hazardous weather outlook, May 28, 4:37 PM EDT, 1 hour 35 minutes before

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In the hours before

Local storm report, May 28, 12:29 PM EDT, 5 hours 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1229 PM EDT WED MAY 28 2014

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

0615 PM     TSTM WND DMG     1 ESE GERMANTOWN        39.17N  77.24W
05/27/2014                   MONTGOMERY         MD   911 CALL CENTER

            TREE DOWN ACROSS SEVERAL POWER LINES ON RT 355 JUST
            SOUTH OF PLUMMER DR.

&&

EVENT NUMBER LWX1400349

KLW

Local storm report, May 28, 12:41 PM EDT, 5 hours 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1241 PM EDT WED MAY 28 2014

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

0718 PM     TSTM WND DMG     2 ENE THE PLAINS        38.87N  77.74W
05/27/2014                   FAUQUIER           VA   911 CALL CENTER

            TREE DOWN ALONG HOPEWELL RD

&&

EVENT NUMBER LWX1400350

KLW

Local storm report, May 28, 12:44 PM EDT, 5 hours 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
1244 PM EDT WED MAY 28 2014

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

0602 PM     TSTM WND DMG     2 SW WALKERSVILLE       39.47N  77.37W
05/27/2014                   FREDERICK          MD   911 CALL CENTER

            TREES AND LOTS OF DEBRIS ACROSS RETREAT RD NEAR
            FOUNTAIN ROCK RD

&&

EVENT NUMBER LWX1400351

KLW

Local storm report, May 28, 3:16 PM EDT, 2 hours 56 minutes before

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Local storm report, May 28, 4:09 PM EDT, 2 hours 3 minutes before

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Local storm report, May 28, 4:21 PM EDT, 1 hour 51 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 27, 8:48 PM EDT	Special Marine Warning	LWX		87 min
May 27, 9:09 PM EDT	Special Marine Warning	LWX		66 min
May 28, 2:22 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier, King George, Prince William, Stafford	38 min
May 28, 2:58 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier	32 min
May 28, 3:25 PM EDT	Severe Thunderstorm Warning	LWX	Fauquier, Prince William, Stafford	50 min
May 27, 8:58 PM EDT	Severe Thunderstorm Warning	LWX	Saint Mary's	47 min

Nearby

Flash Flood Warnings in Virginia, 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.