Alert archive / Virginia / Wind Chill Advisories in 2017

Wind Chill Advisory 7, NWS Baltimore/Washington

December 27, 201712 counties in Virginia; Allegany County, Maryland; Grant County, Mineral County, Pendleton County, West Virginia

NWS Baltimore/Washington issued this wind chill advisory at Dec 27, 2017, 1:36 PM EST for 12 counties in Virginia; Allegany County, Maryland; Grant County, Mineral County, Pendleton County, West Virginia. It took effect at Dec 27, 2017, 7:00 PM EST. It was in force for 13 hr.

The area

The counties it named.

The facts

Issued: Dec 27, 2017, 1:36 PM EST (18:36 UTC)
In effect from: Dec 27, 2017, 7:00 PM EST
Expired: Dec 28, 2017, 8:00 AM EST
In force: 13 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 18:38 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 12:00Z, 6.6 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: 1199 m above ground
0-6 km bulk shear: 102 kt
0-1 km storm-relative helicity: 22 m²/s²
0-3 km storm-relative helicity: 108 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 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 wind chill advisory went out at Dec 27, 10:05 AM EST, 3 hours 31 minutes earlier.

Area forecast discussion, Dec 27, 10:05 AM EST, 3 hours 31 minutes before

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Hazardous weather outlook, Dec 27, 8:29 AM EST, 5 hours 7 minutes before

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In the hours before

Special weather statement, Dec 27, 7:50 AM EST, 5 hours 46 minutes before

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Local storm report, Dec 27, 9:45 AM EST, 3 hours 51 minutes before

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Local storm report, Dec 27, 9:47 AM EST, 3 hours 49 minutes before

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Local storm report, Dec 27, 10:18 AM EST, 3 hours 18 minutes before

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Local storm report, Dec 27, 10:41 AM EST, 2 hours 55 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
Dec 26, 9:30 PM EST	Winter Weather Advisory	LWX	Loudoun	10 hr

Nearby

Wind Chill Advisories in Virginia, 2017 Wind Chill Advisories in West Virginia, 2017 Wind Chill Advisories in Maryland, 2017 Every wind chill advisory in 2017

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.