Alert archive / Virginia / Wind Chill Advisories in 2018

Wind Chill Advisory 2, NWS Baltimore/Washington

January 4, 201828 counties in Virginia; 14 counties in Maryland; 7 counties in West Virginia

NWS Baltimore/Washington issued this wind chill advisory at Jan 4, 2018, 3:36 AM EST for 28 counties in Virginia; 14 counties in Maryland; 7 counties in West Virginia. It took effect at Jan 4, 2018, 10:00 PM EST. It was in force for 14 hr.

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, 10:00 PM EST
Expired: Jan 5, 2018, 12:00 PM EST
In force: 14 hr
Issued by: NWS Baltimore/Washington

All 49 counties

Allegany County, MD, Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Carroll County, MD, Charles County, MD, City of Baltimore, MD, Frederick County, MD, Harford County, MD, Howard County, MD, Montgomery County, MD, Prince George's County, MD, Saint Mary's County, MD, Washington County, MD, Arlington County, VA, City of Alexandria, VA, City of Charlottesville, VA, City of Fairfax, VA, City of Falls Church, VA, City of Fredericksburg, VA, City of Harrisonburg, VA, City of Staunton, VA, City of Waynesboro, VA, City of Winchester, VA, Clarke County, VA, Culpeper County, VA, Fairfax County, VA, Fauquier County, VA, Frederick County, VA, Greene County, VA, King George County, VA, Loudoun County, VA, Madison County, VA, Nelson County, VA, Orange County, VA, Page County, VA, Rappahannock County, VA, Rockingham County, VA, Shenandoah County, VA, Spotsylvania County, VA, Stafford County, VA, Warren County, VA, Berkeley County, WV, Grant County, WV, Hampshire County, WV, Hardy County, WV, Jefferson County, WV, Mineral County, WV, Morgan County, WV

The radar

The Sterling radar (KLWX), 31 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

Wallops Is Stn, VA (KWAL), launched 00:00Z, 8.6 hours before the alert went out and 233 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: 766 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 187 m²/s²
0-3 km storm-relative helicity: 273 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 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 Warning	LWX	Albemarle, Amherst, Augusta, Greene, Highland, Madison and 6 more	56 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 Advisories in Virginia, 2018 Wind Chill Advisories in Maryland, 2018 Wind Chill Advisories in West Virginia, 2018 Every wind chill advisory 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.