Alert archive / West Virginia / Frost Advisories in 2011

Frost Advisory 1, NWS Baltimore/Washington

May 4, 2011Allegany County, Maryland; Grant County, Mineral County, West Virginia

NWS Baltimore/Washington issued this frost advisory at May 4, 2011, 12:50 PM EDT for Allegany County, Maryland; Grant County, Mineral County, West Virginia. It took effect at May 5, 2011, 2:00 AM EDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
May 4, 2011, 12:50 PM EDT (16:50 UTC)
In effect from
May 5, 2011, 2:00 AM EDT
Expired
May 5, 2011, 8:00 AM EDT
In force
6 hr
Issued by
NWS Baltimore/Washington

Counties Allegany County, MD, Grant County, WV, Mineral County, WV

The radar

The Sterling radar (KLWX), 134 km from the middle of the area, began a volume at 16:50 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

Phillips Aaf/Abe, MD (KAPG), launched 12:00Z, 4.8 hours before the alert went out and 245 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, Phillips Aaf/Abe, MD at 12:00Z on 2011-05-04Temperature 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 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Phillips Aaf/Abe, MD at 12:00Z on 2011-05-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -92 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
551 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
-92 m²/s²
0-3 km storm-relative helicity
148 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 3, 8:37 PM EDTSpecial Weather StatementLWXGreene23 min
May 3, 8:41 PM EDTSpecial Weather StatementLWXAlbemarle, City of Charlottesville34 min
May 3, 9:08 PM EDTSpecial Weather StatementLWXAlbemarle37 min
May 3, 9:59 PM EDTSpecial Marine WarningLWX91 min
May 3, 10:12 PM EDTSpecial Marine WarningLWX93 min
May 4, 4:03 AM EDTSmall Craft AdvisoryLWX39 hr
May 4, 5:48 AM EDTSpecial Marine WarningLWX57 min
May 4, 8:38 AM EDTSpecial Marine WarningLWX39 min
May 4, 12:50 PM EDTFreeze WarningLWXHighland19 hr
May 4, 5:24 PM EDTSpecial Weather StatementLWX36 min
May 4, 5:35 PM EDTSpecial Weather StatementLWXLoudoun25 min
May 4, 5:13 PM EDTSpecial Weather StatementLWXMontgomery32 min
May 4, 5:09 PM EDTSpecial Weather StatementLWXBerkeley, Jefferson36 min

Nearby

Frost Advisories in West Virginia, 2011Frost Advisories in Maryland, 2011Every frost advisory in 2011

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.