Alert archive / Virginia / Flash Flood Watches in 2011

Flash Flood Watch 8, NWS Baltimore/Washington

June 19, 201116 counties in Virginia; Allegany County, Maryland; 8 counties in West Virginia

NWS Baltimore/Washington issued this flash flood watch at Jun 19, 2011, 6:42 PM EDT for 16 counties in Virginia; Allegany County, Maryland; 8 counties in West Virginia. It took effect at Jun 19, 2011, 8:00 PM EDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Jun 19, 2011, 6:42 PM EDT (22:42 UTC)
In effect from: Jun 19, 2011, 8:00 PM EDT
Expired: Jun 20, 2011, 4:47 AM EDT
In force: 9 hr
Issued by: NWS Baltimore/Washington
Flood severity: None

All 25 counties

Allegany County, MD, City of Charlottesville, VA, City of Harrisonburg, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Frederick County, VA, Greene County, VA, Highland County, VA, Madison County, VA, Nelson County, VA, Page County, VA, Rappahannock County, VA, Rockingham County, VA, Shenandoah County, VA, Warren County, VA, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV, Pendleton County, WV

The radar

The Sterling radar (KLWX), 98 km from the middle of the area, began a volume at 22:45 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

Pittsburgh, PA (KPIT), launched 12:00Z, 10.7 hours before the alert went out and 220 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: 87 J/kg
Mixed-layer CIN: -31 J/kg
Mixed-layer LCL: 817 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: -57 m²/s²
0-3 km storm-relative helicity: -25 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 flash flood watch 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 watch went out at Jun 19, 2:46 PM EDT, 3 hours 56 minutes earlier.

Area forecast discussion, Jun 19, 2:46 PM EDT, 3 hours 56 minutes before

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Hazardous weather outlook, Jun 19, 5:39 AM EDT, 13 hours 3 minutes before

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In the hours before

Local storm report, Jun 19, 1:56 PM EDT, 4 hours 46 minutes before

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Local storm report, Jun 19, 2:29 PM EDT, 4 hours 13 minutes before

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Local storm report, Jun 19, 2:30 PM EDT, 4 hours 12 minutes before

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Local storm report, Jun 19, 2:31 PM EDT, 4 hours 11 minutes before

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Local storm report, Jun 19, 2:32 PM EDT, 4 hours 10 minutes before

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Local storm report, Jun 19, 2:33 PM EDT, 4 hours 9 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 19, 12:32 AM EDT	Special Weather Statement	LWX	Madison	58 min
Jun 19, 3:10 AM EDT	Special Weather Statement	LWX	Warren	50 min
Jun 19, 3:19 AM EDT	Flash Flood Warning	LWX	Rappahannock, Warren	3 hr
Jun 19, 4:28 AM EDT	Special Weather Statement	LWX	Spotsylvania	47 min
Jun 19, 4:56 AM EDT	Flash Flood Warning	LWX	Spotsylvania	110 min
Jun 19, 7:21 PM EDT	Small Craft Advisory	LWX		19 hr
Jun 18, 8:25 PM EDT	Flash Flood Warning	LWX	Hampshire, Mineral	3 hr

Nearby

Flash Flood Watches in Virginia, 2011 Flash Flood Watches in West Virginia, 2011 Flash Flood Watches in Maryland, 2011 Every flash flood watch 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.