Alert archive / Virginia / Wind Chill Warnings in 2018

Wind Chill Warning 1, NWS Baltimore/Washington

January 4, 201812 counties in Virginia; Allegany County, Maryland; Grant County, Mineral County, Pendleton County, West Virginia

NWS Baltimore/Washington issued this wind chill warning at Jan 4, 2018, 3:36 AM EST for 12 counties in Virginia; Allegany County, Maryland; Grant County, Mineral County, Pendleton County, West Virginia. It took effect at Jan 4, 2018, 6:00 PM EST. It was in force for 42 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jan 4, 2018, 3:36 AM EST (08:36 UTC)
In effect from: Jan 4, 2018, 6:00 PM EST
Expired: Jan 6, 2018, 12:00 PM EST
In force: 42 hr
Issued by: NWS Baltimore/Washington

Counties Allegany County, MD, Albemarle County, VA, Amherst County, VA, Augusta County, VA, Greene County, VA, Highland County, VA, Madison County, VA, Nelson County, VA, Page County, VA, Rappahannock County, VA, Rockbridge County, VA, Rockingham County, VA, Warren County, VA, Grant County, WV, Mineral County, WV, Pendleton County, WV

The radar

The Sterling radar (KLWX), 128 km from the middle of the area, began a volume at 08:38 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

Roanoke, VA (KRNK), launched 00:00Z, 8.6 hours before the alert went out and 156 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: 2254 m above ground
0-6 km bulk shear: 87 kt
0-1 km storm-relative helicity: -106 m²/s²
0-3 km storm-relative helicity: 24 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 wind chill warning 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 wind chill warning went out at Jan 4, 3:36 AM EST, 0 minutes earlier.

Area forecast discussion, Jan 4, 3:36 AM EST, 0 minutes before

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Hazardous weather outlook, Jan 4, 12:05 AM EST, 3 hours 31 minutes before

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In the hours before

Local storm report, Jan 4, 12:23 AM EST, 3 hours 13 minutes before

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Local storm report, Jan 4, 12:34 AM EST, 3 hours 2 minutes before

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Local storm report, Jan 4, 1:12 AM EST, 2 hours 24 minutes before

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Local storm report, Jan 4, 1:14 AM EST, 2 hours 22 minutes before

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Local storm report, Jan 4, 1:22 AM EST, 2 hours 14 minutes before

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Local storm report, Jan 4, 1:58 AM EST, 1 hour 38 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
Jan 4, 3:36 AM EST	Wind Chill Watch	LWX	Albemarle, Amherst, Augusta, Greene, Highland, Madison and 6 more	24 hr
Jan 4, 3:36 AM EST	Wind Chill Advisory	LWX	Arlington, Clarke, Culpeper, Fairfax, Fauquier, Frederick and 22 more	32 hr
Jan 4, 12:47 PM EST	Wind Advisory	LWX	Arlington, Clarke, Fairfax, Fauquier, Frederick, Loudoun and 4 more	5 hr
Jan 4, 12:07 AM EST	Winter Storm Warning	LWX	Calvert, Saint Mary's	14 hr

Nearby

Wind Chill Warnings in Virginia, 2018 Wind Chill Warnings in West Virginia, 2018 Wind Chill Warnings in Maryland, 2018 Every wind chill warning in 2018

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.