Alert archive / Virginia / Flash Flood Watches in 2012
Flash Flood Watch 1, NWS Baltimore/Washington
NWS Baltimore/Washington issued this flash flood watch at Mar 24, 2012, 3:19 PM EDT for 7 counties in Virginia; Pendleton County, West Virginia. It took effect at Mar 24, 2012, 5:00 PM EDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Mar 24, 2012, 3:19 PM EDT (19:19 UTC)
- In effect from
- Mar 24, 2012, 5:00 PM EDT
- Expired
- Mar 25, 2012, 1:42 AM EDT
- In force
- 9 hr
- Issued by
- NWS Baltimore/Washington
- Flood severity
- None
Counties City of Charlottesville, VA, City of Harrisonburg, VA, City of Staunton, VA, City of Waynesboro, VA, Highland County, VA, Nelson County, VA, Rockingham County, VA, Pendleton County, WV
The radar
The Sterling radar (KLWX), 154 km from the middle of the area, began a volume at 19:20 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 12:00Z, 7.3 hours before the alert went out and 125 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.
- Mixed-layer CAPE
- 250 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 519 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- -13 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Mar 24, 10:06 AM EDT, 5 hours 13 minutes earlier.
Area forecast discussion, Mar 24, 10:06 AM EDT, 5 hours 13 minutes before
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</html>Hazardous weather outlook, Mar 24, 8:59 AM EDT, 6 hours 20 minutes before
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Flash Flood Watches in Virginia, 2012Flash Flood Watches in West Virginia, 2012Every flash flood watch in 2012
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.