Alert archive / Virginia / Freeze Warnings in 2020

Freeze Warning 2, NWS Wakefield, VA

April 16, 202010 counties in Virginia; 4 counties in Maryland

NWS Wakefield, VA issued this freeze warning at Apr 16, 2020, 3:12 PM EDT for 10 counties in Virginia; 4 counties in Maryland. It took effect at Apr 17, 2020, 12:00 AM EDT. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 16, 2020, 3:12 PM EDT (19:12 UTC)
In effect from
Apr 17, 2020, 12:00 AM EDT
Expired
Apr 17, 2020, 9:00 AM EDT
In force
9 hr
Issued by
NWS Wakefield, VA

Counties Dorchester County, MD, Somerset County, MD, Wicomico County, MD, Worcester County, MD, Caroline County, VA, Essex County, VA, Fluvanna County, VA, Goochland County, VA, Hanover County, VA, King and Queen County, VA, King William County, VA, Louisa County, VA, Richmond County, VA, Westmoreland County, VA

The radar

The Norfolk radar (KAKQ), 112 km from the middle of the area, began a volume at 19:10 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

Washington/Dulle, VA (KIAD), launched 12:00Z, 7.2 hours before the alert went out and 116 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, Washington/Dulle, VA at 12:00Z on 2020-04-16Temperature 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, Washington/Dulle, VA at 12:00Z on 2020-04-16The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -49 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
1627 m above ground
0-6 km bulk shear
80 kt
0-1 km storm-relative helicity
-49 m²/s²
0-3 km storm-relative helicity
42 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Wakefield, VA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 16, 3:00 AM EDTFreeze WatchAKQCaroline, Fluvanna, Goochland, Hanover, Louisa12 hr
Apr 16, 3:12 PM EDTFrost AdvisoryAKQAccomack, Amelia, Brunswick, Charles City, Chesterfield, Cumberland and 33 more18 hr

Nearby

Freeze Warnings in Virginia, 2020Freeze Warnings in Maryland, 2020Every freeze warning 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.