Alert archive / West Virginia / Frost Advisories in 2020

Frost Advisory 2, NWS Baltimore/Washington

May 6, 2020Allegany County, Maryland; Grant County, Mineral County, West Virginia

NWS Baltimore/Washington issued this frost advisory at May 6, 2020, 2:13 PM EDT for Allegany County, Maryland; Grant County, Mineral County, West Virginia. It took effect at May 7, 2020, 2:00 AM EDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: May 6, 2020, 2:13 PM EDT (18:13 UTC)
In effect from: May 7, 2020, 2:00 AM EDT
Expired: May 7, 2020, 9:00 AM EDT
In force: 7 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 18:13 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, 6.2 hours before the alert went out and 151 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: 643 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: -80 m²/s²
0-3 km storm-relative helicity: 62 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 Baltimore/Washington wrote its last area forecast discussion before this frost advisory went out at May 6, 10:34 AM EDT, 3 hours 39 minutes earlier.

Area forecast discussion, May 6, 10:34 AM EDT, 3 hours 39 minutes before

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Hazardous weather outlook, May 6, 5:30 AM EDT, 8 hours 43 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 6, 4:10 AM EDT	Small Craft Advisory	LWX		38 hr
May 6, 4:30 AM EDT	Freeze Warning	LWX	Highland	29 hr
May 6, 3:14 PM EDT	Special Marine Warning	LWX		85 min
May 6, 3:38 PM EDT	Special Marine Warning	LWX		2 hr

Nearby

Frost Advisories in West Virginia, 2020 Frost Advisories in Maryland, 2020 Every frost advisory in 2020

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.