Alert archive / Kentucky / Frost Advisories in 2018

Frost Advisory 1, NWS Charleston, WV

April 20, 2018Wayne County, West Virginia; Lawrence County, Ohio; 4 counties in Kentucky

NWS Charleston, WV issued this frost advisory at Apr 20, 2018, 2:13 PM EDT for Wayne County, West Virginia; Lawrence County, Ohio; 4 counties in Kentucky. It took effect at Apr 21, 2018, 12:00 AM EDT. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued
Apr 20, 2018, 2:13 PM EDT (18:13 UTC)
In effect from
Apr 21, 2018, 12:00 AM EDT
Expired
Apr 21, 2018, 10:00 AM EDT
In force
10 hr
Issued by
NWS Charleston, WV

Counties Boyd County, KY, Carter County, KY, Greenup County, KY, Lawrence County, KY, Lawrence County, OH, Wayne County, WV

The radar

The Charleston,WV radar (KRLX), 88 km from the middle of the area, began a volume at 18:19 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

Cncnati-Daytn, OH (KILN), launched 12:00Z, 6.2 hours before the alert went out and 153 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, Cncnati-Daytn, OH at 12:00Z on 2018-04-20Temperature 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, Cncnati-Daytn, OH at 12:00Z on 2018-04-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -89 square meters per square second.1939587897Sfc1 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
1925 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
-89 m²/s²
0-3 km storm-relative helicity
-79 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Charleston, WV issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 20, 2:13 PM EDTFreeze WarningRLXBoone, Braxton, Cabell, Calhoun, Clay, Doddridge and 18 more20 hr

Nearby

Frost Advisories in Kentucky, 2018Frost Advisories in West Virginia, 2018Frost Advisories in Ohio, 2018Every frost 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.