Alert archive / West Virginia / Frost Advisories in 2013

Frost Advisory 5, NWS Charleston, WV

May 13, 20139 counties in West Virginia; Morgan County, Washington County, Ohio

NWS Charleston, WV issued this frost advisory at May 13, 2013, 2:45 PM EDT for 9 counties in West Virginia; Morgan County, Washington County, Ohio. It took effect at May 14, 2013, 1:00 AM EDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued: May 13, 2013, 2:45 PM EDT (18:45 UTC)
In effect from: May 14, 2013, 1:00 AM EDT
Expired: May 14, 2013, 9:00 AM EDT
In force: 8 hr
Issued by: NWS Charleston, WV

Counties Morgan County, OH, Washington County, OH, Braxton County, WV, Calhoun County, WV, Clay County, WV, Gilmer County, WV, Pleasants County, WV, Ritchie County, WV, Roane County, WV, Wirt County, WV, Wood County, WV

The radar

The Charleston,WV radar (KRLX), 92 km from the middle of the area, began a volume at 18:48 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 12:00Z, 6.8 hours before the alert went out and 180 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1252 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: -1 m²/s²
0-3 km storm-relative helicity: -129 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 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 12, 7:23 PM EDT, 19 hours 22 minutes earlier.

Area forecast discussion, May 12, 7:23 PM EDT, 19 hours 22 minutes before

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Hazardous weather outlook, May 12, 3:38 PM EDT, 23 hours 7 minutes before

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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 13, 4:05 AM EDT	Freeze Watch	RLX	Barbour, Doddridge, Harrison, Lewis, Pleasants, Ritchie and 3 more	11 hr
May 13, 2:45 PM EDT	Freeze Warning	RLX	Barbour, Doddridge, Harrison, Lewis, Taylor, Tyler and 1 more	18 hr

Nearby

Frost Advisories in West Virginia, 2013 Frost Advisories in Ohio, 2013 Every frost advisory in 2013

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.