Alert archive / Virginia / Wind Advisories in 2020

Wind Advisory 1, NWS Baltimore/Washington

January 4, 202011 counties in Virginia

NWS Baltimore/Washington issued this wind advisory at Jan 4, 2020, 5:12 PM EST for 11 counties in Virginia. It took effect at Jan 4, 2020, 11:00 PM EST. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued
Jan 4, 2020, 5:12 PM EST (22:12 UTC)
In effect from
Jan 4, 2020, 11:00 PM EST
Expired
Jan 5, 2020, 9:17 AM EST
In force
10 hr
Issued by
NWS Baltimore/Washington

Counties 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), 132 km from the middle of the area, began a volume at 22:12 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, 10.2 hours before the alert went out and 137 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-pSkew-T log-p diagram, Roanoke, VA at 12:00Z on 2020-01-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Roanoke, VA at 12:00Z on 2020-01-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -119 square meters per square second.1939587897117136156Sfc1 km3 km6 km9 kmRMLM
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
620 m above ground
0-6 km bulk shear
96 kt
0-1 km storm-relative helicity
-119 m²/s²
0-3 km storm-relative helicity
-48 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Baltimore/Washington issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 4, 4:14 AM ESTDense Fog AdvisoryLWXArlington, Clarke, Fairfax, Fauquier, Frederick, Loudoun and 4 more7 hr
Jan 4, 2:11 PM ESTWinter Weather AdvisoryLWXHighland16 hr
Jan 4, 2:22 PM ESTGale WarningLWX19 hr
Jan 4, 4:43 PM ESTSpecial Marine WarningLWX62 min
Jan 4, 5:30 PM ESTSpecial Marine WarningLWX90 min

Nearby

Wind Advisories in Virginia, 2020Every 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.