Alert archive / West Virginia / Frost Advisories in 2014

Frost Advisory 4, NWS Baltimore/Washington

May 18, 2014Highland County, Virginia; Allegany County, Maryland; 5 counties in West Virginia

NWS Baltimore/Washington issued this frost advisory at May 18, 2014, 1:34 PM EDT for Highland County, Virginia; Allegany County, Maryland; 5 counties in West Virginia. It took effect at May 19, 2014, 4:00 AM EDT. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
May 18, 2014, 1:34 PM EDT (17:34 UTC)
In effect from
May 19, 2014, 4:00 AM EDT
Expired
May 19, 2014, 7:58 AM EDT
In force
4 hr
Issued by
NWS Baltimore/Washington

Counties Allegany County, MD, Highland County, VA, Grant County, WV, Hampshire County, WV, Hardy County, WV, Mineral County, WV, Pendleton County, WV

The radar

The Sterling radar (KLWX), 134 km from the middle of the area, began a volume at 17:35 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 (KAGC), launched 12:00Z, 5.6 hours before the alert went out and 174 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-pSkew-T log-p diagram, Pittsburgh, PA at 12:00Z on 2014-05-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Pittsburgh, PA at 12:00Z on 2014-05-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1112 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
58 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 18, 2:15 AM EDTSmall Craft AdvisoryLWX7 hr
May 18, 2:26 AM EDTCoastal Flood AdvisoryLWXArlington, City of Alexandria, City of Falls Church23 hr
May 18, 6:08 PM EDTAreal Flood WarningLWXLoudoun3 hr
May 18, 7:43 PM EDTFreeze WarningLWXHighland12 hr

Nearby

Frost Advisories in West Virginia, 2014Frost Advisories in Virginia, 2014Frost Advisories in Maryland, 2014Every frost advisory in 2014

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.