Alert archive / West Virginia / Frost Advisories in 2009

Frost Advisory 4, NWS Charleston, WV

May 17, 200926 counties in West Virginia; 9 counties in Ohio; 4 counties in Kentucky

NWS Charleston, WV issued this frost advisory at May 17, 2009, 3:54 AM EDT for 26 counties in West Virginia; 9 counties in Ohio; 4 counties in Kentucky. It took effect at May 18, 2009, 4:00 AM EDT. It was in force for 5 hr.

The area

The counties it named.

The facts

Issued: May 17, 2009, 3:54 AM EDT (07:54 UTC)
In effect from: May 18, 2009, 4:00 AM EDT
Expired: May 18, 2009, 9:00 AM EDT
In force: 5 hr
Issued by: NWS Charleston, WV

All 39 counties

Boyd County, KY, Carter County, KY, Greenup County, KY, Lawrence County, KY, Athens County, OH, Gallia County, OH, Jackson County, OH, Lawrence County, OH, Meigs County, OH, Morgan County, OH, Perry County, OH, Vinton County, OH, Washington County, OH, Barbour County, WV, Boone County, WV, Braxton County, WV, Cabell County, WV, Calhoun County, WV, Clay County, WV, Doddridge County, WV, Gilmer County, WV, Harrison County, WV, Jackson County, WV, Kanawha County, WV, Lewis County, WV, Lincoln County, WV, Logan County, WV, Mason County, WV, Pleasants County, WV, Putnam County, WV, Ritchie County, WV, Roane County, WV, Taylor County, WV, Tyler County, WV, Upshur County, WV, Wayne County, WV, Wirt County, WV, Wood County, WV, Wyoming County, WV

The radar

The Charleston,WV radar (KRLX), 56 km from the middle of the area, began a volume at 07:57 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 00:00Z, 7.9 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: 287 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 593 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 61 m²/s²
0-3 km storm-relative helicity: 49 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.8

Open this sounding in Storm Lab

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 Charleston, WV wrote its last area forecast discussion before this frost advisory went out at May 16, 6:14 PM EDT, 9 hours 40 minutes earlier.

Area forecast discussion, May 16, 6:14 PM EDT, 9 hours 40 minutes before

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Hazardous weather outlook, May 16, 4:34 PM EDT, 11 hours 20 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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The office that day

Everything else NWS Charleston, WV issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 17, 3:54 AM EDT	Freeze Warning	RLX	Barbour, Braxton, Harrison, Lewis, Taylor, Upshur	29 hr

Nearby

Frost Advisories in West Virginia, 2009 Frost Advisories in Ohio, 2009 Frost Advisories in Kentucky, 2009 Every frost advisory in 2009

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.