Alert archive / Virginia / Wind Advisories in 2020

Wind Advisory 16, NWS Baltimore/Washington

December 23, 202011 counties in Virginia; 7 counties in Maryland

NWS Baltimore/Washington issued this wind advisory at Dec 23, 2020, 9:07 PM EST for 11 counties in Virginia; 7 counties in Maryland. It took effect at Dec 24, 2020, 10:00 AM EST. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued: Dec 23, 2020, 9:07 PM EST (02:07 UTC)
In effect from: Dec 24, 2020, 10:00 AM EST
Expired: Dec 25, 2020, 2:00 AM EST
In force: 16 hr
Issued by: NWS Baltimore/Washington

Counties Anne Arundel County, MD, Baltimore County, MD, Calvert County, MD, Cecil County, MD, City of Baltimore, MD, Harford County, MD, Saint Mary's County, MD, Albemarle County, VA, Amherst County, VA, Augusta County, VA, Greene County, VA, Madison County, VA, Nelson County, VA, Page County, VA, Rappahannock County, VA, Rockbridge County, VA, Rockingham County, VA, Warren County, VA

The radar

The Sterling radar (KLWX), 53 km from the middle of the area, began a volume at 02:06 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, 2.1 hours before the alert went out and 213 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: 1650 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: 284 m²/s²
0-3 km storm-relative helicity: 299 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 23, 3:30 PM EST, 5 hours 37 minutes earlier.

Area forecast discussion, Dec 23, 3:30 PM EST, 5 hours 37 minutes before

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Hazardous weather outlook, Dec 23, 4:49 PM EST, 4 hours 18 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 23, 9:07 PM EST	River Flood Watch	LWX	Culpeper, Fauquier	56 hr
Dec 24, 3:37 AM EST	Winter Weather Advisory	LWX	Highland	30 hr
Dec 24, 4:41 AM EST	River Flood Watch	LWX	Loudoun	30 hr
Dec 24, 4:41 AM EST	River Flood Watch	LWX	Spotsylvania, Stafford, City of Fredericksburg	54 hr
Dec 24, 11:47 AM EST	River Flood Watch	LWX	Fairfax, City of Fairfax	31 hr
Dec 24, 11:47 AM EST	River Flood Watch	LWX	Clarke, Warren	61 hr
Dec 24, 11:47 AM EST	River Flood Watch	LWX	Loudoun	37 hr
Dec 24, 11:47 AM EST	River Flood Watch	LWX	Loudoun	31 hr
Dec 24, 12:25 PM EST	Areal Flood Warning	LWX	Greene	6 hr
Dec 24, 3:11 PM EST	Areal Flood Warning	LWX	Albemarle, Greene, City of Charlottesville	10 hr
Dec 24, 3:36 PM EST	Severe Thunderstorm Warning	LWX	Culpeper, Fairfax, Fauquier, Prince William, Spotsylvania, Stafford and 3 more	39 min
Dec 24, 3:46 PM EST	Areal Flood Warning	LWX	Greene, Madison, Orange, Page, Rappahannock, Rockingham	9 hr
Dec 24, 3:56 PM EST	Special Marine Warning	LWX		34 min
Dec 24, 4:33 PM EST	Areal Flood Warning	LWX	Clarke, Fauquier, Rappahannock, Warren	9 hr
Dec 24, 5:09 PM EST	Areal Flood Warning	LWX	Fairfax, City of Fairfax	17 hr
Dec 24, 5:54 PM EST	Coastal Flood Advisory	LWX	Arlington, King George, City of Alexandria, City of Falls Church	24 hr
Dec 24, 6:06 PM EST	Areal Flood Warning	LWX	Albemarle, Culpeper, Madison, Orange	16 hr
Dec 23, 9:07 PM EST	River Flood Watch	LWX	Frederick	56 hr
Dec 23, 9:07 PM EST	River Flood Watch	LWX	Montgomery	43 hr
Dec 23, 9:07 PM EST	River Flood Watch	LWX	Washington	60 hr
Dec 24, 3:37 AM EST	Winter Storm Warning	LWX		30 hr
Dec 24, 4:41 AM EST	River Flood Watch	LWX	Washington	38 hr
Dec 24, 5:54 PM EST	Coastal Flood Warning	LWX	Anne Arundel, Baltimore, City of Baltimore	13 hr
Dec 23, 9:07 PM EST	River Flood Watch	LWX	Pendleton	25 hr
Dec 23, 9:07 PM EST	River Flood Watch	LWX	Berkeley, Jefferson	17 hr
Dec 24, 4:41 AM EST	River Flood Watch	LWX	Morgan	21 days
Dec 24, 1:58 PM EST	River Flood Warning	LWX	Berkeley, Jefferson	31 hr

Nearby

Wind Advisories in Virginia, 2020 Wind Advisories in Maryland, 2020 Every wind 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.