Alert archive / West Virginia / Frost Advisories in 2020
Frost Advisory 10, NWS Charleston, WV
NWS Charleston, WV issued this frost advisory at Sep 20, 2020, 12:47 PM EDT for Pocahontas County, Randolph County, West Virginia. It took effect at Sep 21, 2020, 2:00 AM EDT. It was in force for 7 hr.
The area
The counties it named.
The facts
- Issued
- Sep 20, 2020, 12:47 PM EDT (16:47 UTC)
- In effect from
- Sep 21, 2020, 2:00 AM EDT
- Expired
- Sep 21, 2020, 8:58 AM EDT
- In force
- 7 hr
- Issued by
- NWS Charleston, WV
Counties Pocahontas County, WV, Randolph County, WV
The radar
The Charleston,WV radar (KRLX), 157 km from the middle of the area, began a volume at 16:49 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, 4.8 hours before the alert went out and 225 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1708 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- -75 m²/s²
- 0-3 km storm-relative helicity
- 16 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this frost advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Charleston, WV wrote its last area forecast discussion before this frost advisory went out at Sep 19, 6:52 PM EDT, 17 hours 55 minutes earlier.
Area forecast discussion, Sep 19, 6:52 PM EDT, 17 hours 55 minutes before
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</html>Hazardous weather outlook, Sep 19, 5:21 PM EDT, 19 hours 26 minutes before
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Frost Advisories in West Virginia, 2020Every frost 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.