Alert archive / Virginia / Flash Flood Warnings in 2015

Flash Flood Warning 65, NWS Baltimore/Washington

July 28, 2015Augusta County, City of Staunton, Virginia

NWS Baltimore/Washington issued this flash flood warning at Jul 28, 2015, 10:30 PM EDT for Augusta County, City of Staunton, 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 28, 2015, 10:30 PM EDT (02:30 UTC)
Expired: Jul 29, 2015, 1:30 AM EDT
In force: 3 hr
Issued by: NWS Baltimore/Washington
Area: Storm-based polygon
Flood severity: None

Counties Augusta County, VA, City of Staunton, VA

The radar

The Roanoke radar (KFCX), 163 km from the middle of the area, began a volume at 02:32 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, 2.5 hours before the alert went out and 112 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: 248 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1232 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 47 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 Jul 28, 9:21 PM EDT, 1 hour 9 minutes earlier.

Area forecast discussion, Jul 28, 9:21 PM EDT, 1 hour 9 minutes before

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Hazardous weather outlook, Jul 28, 8:56 PM EDT, 1 hour 34 minutes before

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In the hours before

Local storm report, Jul 28, 7:33 PM EDT, 2 hours 57 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 28, 8:56 PM EDT	Flash Flood Warning	LWX	Nelson	3 hr
Jul 29, 4:13 AM EDT	Small Craft Advisory	LWX		39 hr
Jul 29, 4:56 AM EDT	Dense Fog Advisory	LWX	Culpeper, Fauquier, Orange, Page, Rockingham, Shenandoah and 5 more	3 hr
Jul 29, 2:57 PM EDT	Flash Flood Warning	LWX	Baltimore, City of Baltimore	3 hr

Nearby

Flash Flood Warnings in Virginia, 2015 Every flash flood warning in 2015

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.