Alert archive / Virginia / Flash Flood Warnings in 2004

Flash Flood Warning 31, NWS Baltimore/Washington

July 4, 2004Augusta County, Nelson County, Virginia

NWS Baltimore/Washington issued this flash flood warning at Jul 4, 2004, 1:34 AM EDT for Augusta County, Nelson 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: Jul 4, 2004, 1:34 AM EDT (05:34 UTC)
Expired: Jul 4, 2004, 4:30 AM EDT
In force: 3 hr
Issued by: NWS Baltimore/Washington
Area: Counties, with a storm outline in the text

Counties Augusta County, VA, Nelson County, VA

The radar

The Roanoke radar (KFCX), 154 km from the middle of the area, began a volume at 05:35 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

Roanoke, VA (KRNK), launched 00:00Z, 5.6 hours before the alert went out and 96 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: 818 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 813 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 57 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 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 Jul 3, 10:44 PM EDT, 2 hours 50 minutes earlier.

Area forecast discussion, Jul 3, 10:44 PM EDT, 2 hours 50 minutes before

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Hazardous weather outlook, Jul 3, 11:00 AM EDT, 14 hours 34 minutes before

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In the hours before

Special weather statement, Jul 4, 12:54 AM EDT, 40 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
Jul 4, 7:08 PM EDT	Severe Thunderstorm Warning	LWX	Albemarle, City of Charlottesville	52 min

Nearby

Flash Flood Warnings in Virginia, 2004 Every flash flood warning in 2004

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.