Alert archive / Florida / Mesoscale Discussions in 2018
Mesoscale Discussion 282
The Storm Prediction Center issued this mesoscale discussion at Apr 22, 2018, 1:58 PM CDT for 14 counties in Alabama; 15 counties in Florida; 9 counties in Georgia. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 22, 2018, 1:58 PM CDT (18:58 UTC)
- Expired
- Apr 22, 2018, 4:30 PM CDT
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
All 38 counties
Baldwin County, AL, Barbour County, AL, Butler County, AL, Coffee County, AL, Conecuh County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Escambia County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Monroe County, AL, Pike County, AL, Bay County, FL, Calhoun County, FL, Escambia County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Leon County, FL, Liberty County, FL, Okaloosa County, FL, Santa Rosa County, FL, Wakulla County, FL, Walton County, FL, Washington County, FL, Baker County, GA, Calhoun County, GA, Clay County, GA, Decatur County, GA, Early County, GA, Grady County, GA, Miller County, GA, Quitman County, GA, Seminole County, GA
The radar
The Eglin Afb radar (KEVX), 7 km from the middle of the area, began a volume at 18:59 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 7.0 hours before the alert went out and 163 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
- 640 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 265 m²/s²
- 0-3 km storm-relative helicity
- 347 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted.
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</html>SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 10:37 AM CDT | Mesoscale Discussion | SPC | Baldwin, Choctaw, Clarke, Mobile, Washington | 2 hr |
| Apr 22, 2:55 PM CDT | Tornado Watch | SPC | Barbour, Bullock, Coffee, Covington, Crenshaw, Dale and 8 more | 8 hr |
| Apr 22, 3:58 PM CDT | Mesoscale Discussion | SPC | Autauga, Bibb, Chilton, Dallas, Fayette, Greene and 11 more | 3 hr |
Nearby
Mesoscale Discussions in Florida, 2018Mesoscale Discussions in Alabama, 2018Mesoscale Discussions in Georgia, 2018Every mesoscale discussion 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.