Alert archive / Virginia / Frost Advisories in 2007
Frost Advisory 3, NWS Baltimore/Washington
NWS Baltimore/Washington issued this frost advisory at May 7, 2007, 3:44 AM EDT for 10 counties in Virginia; 4 counties in West Virginia. It took effect at May 7, 2007, 2:32 PM EDT. It was in force for 17 hr.
The area
The counties it named.
The facts
- Issued
- May 7, 2007, 3:44 AM EDT (07:44 UTC)
- In effect from
- May 7, 2007, 2:32 PM EDT
- Expired
- May 8, 2007, 8:00 AM EDT
- In force
- 17 hr
- Issued by
- NWS Baltimore/Washington
Counties City of Harrisonburg, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Frederick County, VA, Page County, VA, Rockingham County, VA, Shenandoah County, VA, Warren County, VA, Grant County, WV, Hampshire County, WV, Hardy County, WV, Mineral County, WV
The radar
The Sterling radar (KLWX), 101 km from the middle of the area, began a volume at 07:49 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, 7.7 hours before the alert went out and 198 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3157 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 18 m²/s²
- 0-3 km storm-relative helicity
- 105 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this frost advisory 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 frost advisory went out at May 6, 3:02 PM EDT, 12 hours 42 minutes earlier.
Area forecast discussion, May 6, 3:02 PM EDT, 12 hours 42 minutes before
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</html>Hazardous weather outlook, May 6, 4:25 PM EDT, 11 hours 19 minutes before
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</html>Nearby
Frost Advisories in Virginia, 2007Frost Advisories in West Virginia, 2007Every frost advisory in 2007
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.