Alert archive / Alabama / Frost Advisories in 2020
Frost Advisory 1, NWS Birmingham, AL
NWS Birmingham, AL issued this frost advisory at Apr 10, 2020, 3:21 PM CDT for 7 counties in Alabama. It took effect at Apr 11, 2020, 3:00 AM CDT. It was in force for 5 hr.
The area
The counties it named.
The facts
- Issued
- Apr 10, 2020, 3:21 PM CDT (20:21 UTC)
- In effect from
- Apr 11, 2020, 3:00 AM CDT
- Expired
- Apr 11, 2020, 8:00 AM CDT
- In force
- 5 hr
- Issued by
- NWS Birmingham, AL
Counties Blount County, AL, Calhoun County, AL, Cherokee County, AL, Cleburne County, AL, Etowah County, AL, St. Clair County, AL, Winston County, AL
The radar
The Birmingham radar (KBMX), 101 km from the middle of the area, began a volume at 20:25 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
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.4 hours before the alert went out and 167 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
- 1958 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- -73 m²/s²
- 0-3 km storm-relative helicity
- -42 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 Birmingham, AL wrote its last area forecast discussion before this frost advisory went out at Apr 10, 1:50 PM CDT, 1 hour 31 minutes earlier.
Area forecast discussion, Apr 10, 1:50 PM CDT, 1 hour 31 minutes before
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</html>Hazardous weather outlook, Apr 10, 2:56 AM CDT, 12 hours 25 minutes before
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</html>Nearby
Frost Advisories in Alabama, 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.