Alert archive / Virginia / Wind Advisories in 2018

Wind Advisory 16, NWS Baltimore/Washington

December 21, 201815 counties in Virginia; Pendleton County, West Virginia

NWS Baltimore/Washington issued this wind advisory at Dec 21, 2018, 4:07 AM EST for 15 counties in Virginia; Pendleton County, West Virginia. It took effect at Dec 21, 2018, 7:00 PM EST. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Dec 21, 2018, 4:07 AM EST (09:07 UTC)
In effect from: Dec 21, 2018, 7:00 PM EST
Expired: Dec 22, 2018, 9:37 AM EST
In force: 15 hr
Issued by: NWS Baltimore/Washington

Counties Albemarle County, VA, Amherst County, VA, Augusta County, VA, City of Harrisonburg, VA, City of Staunton, VA, City of Waynesboro, 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, Pendleton County, WV

The radar

The Sterling radar (KLWX), 140 km from the middle of the area, began a volume at 09:07 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, 9.1 hours before the alert went out and 134 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: 529 m above ground
0-6 km bulk shear: 82 kt
0-1 km storm-relative helicity: 703 m²/s²
0-3 km storm-relative helicity: 740 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 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 advisory went out at Dec 21, 4:00 AM EST, 7 minutes earlier.

Area forecast discussion, Dec 21, 4:00 AM EST, 7 minutes before

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Hazardous weather outlook, Dec 21, 12:31 AM EST, 3 hours 36 minutes before

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In the hours before

Local storm report, Dec 20, 11:11 PM EST, 4 hours 56 minutes before

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Local storm report, Dec 20, 11:50 PM EST, 4 hours 17 minutes before

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Local storm report, Dec 21, 12:03 AM EST, 4 hours 4 minutes before

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Local storm report, Dec 21, 12:59 AM EST, 3 hours 8 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 20, 8:27 PM EST	Areal Flood Warning	LWX	Albemarle, Augusta, Nelson, City of Charlottesville, City of Staunton, City of Waynesboro	13 hr
Dec 20, 11:58 PM EST	Areal Flood Warning	LWX	Culpeper, Greene, Madison, Orange, Page, Rappahannock and 2 more	12 hr
Dec 21, 4:09 AM EST	Winter Weather Advisory	LWX	Highland	29 hr
Dec 21, 4:32 AM EST	River Flood Watch	LWX	Warren	13 hr
Dec 21, 4:35 AM EST	River Flood Watch	LWX	Page	6 hr
Dec 21, 4:37 AM EST	River Flood Watch	LWX	Rockingham	6 hr
Dec 21, 11:33 AM EST	Areal Flood Warning	LWX	Augusta, Rockingham	7 hr
Dec 21, 2:38 PM EST	Gale Warning	LWX		19 hr
Dec 21, 3:16 PM EST	Special Marine Warning	LWX		119 min
Dec 21, 4:00 PM EST	Severe Thunderstorm Warning	LWX	Fairfax, Loudoun, Prince William, City of Fairfax, City of Manassas, City of Manassas Park	45 min
Dec 21, 2:17 AM EST	Coastal Flood Warning	LWX	Anne Arundel, Saint Mary's	25 hr
Dec 21, 3:37 AM EST	Areal Flood Warning	LWX	Baltimore, Harford	5 hr
Dec 21, 1:48 PM EST	Coastal Flood Advisory	LWX	Anne Arundel, Saint Mary's	13 hr
Dec 21, 3:51 PM EST	Severe Thunderstorm Warning	LWX	Howard, Montgomery	24 min
Dec 21, 4:29 PM EST	Severe Thunderstorm Warning	LWX	Montgomery	46 min
Dec 21, 4:45 PM EST	Severe Thunderstorm Warning	LWX	Baltimore, Carroll, Harford	45 min
Dec 21, 5:01 PM EST	Severe Thunderstorm Warning	LWX	Carroll, Frederick, Howard	29 min

Nearby

Wind Advisories in Virginia, 2018 Wind Advisories in West Virginia, 2018 Every wind 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.