Alert archive / Florida / Mesoscale Discussions in 2018
Mesoscale Discussion 263
The Storm Prediction Center issued this mesoscale discussion at Apr 15, 2018, 1:45 AM CDT for 5 counties in Alabama; 7 counties in Florida; 7 counties in Georgia. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 2018, 1:45 AM CDT (06:45 UTC)
- Expired
- Apr 15, 2018, 3:45 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
Counties Coffee County, AL, Dale County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Bay County, FL, Calhoun County, FL, Gulf County, FL, Holmes County, FL, Jackson County, FL, Walton County, FL, Washington County, FL, Calhoun County, GA, Clay County, GA, Early County, GA, Miller County, GA, Quitman County, GA, Randolph County, GA, Seminole County, GA
The radar
The Eglin Afb radar (KEVX), 60 km from the middle of the area, began a volume at 06:48 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
Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 6.8 hours before the alert went out and 122 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
- 1537 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 79 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 14, 9:27 PM CDT | Mesoscale Discussion | SPC | Baldwin, Butler, Clarke, Conecuh, Covington, Crenshaw and 10 more | 93 min |
| Apr 14, 10:58 PM CDT | Tornado Watch | SPC | Coffee, Dale, Geneva, Henry, Houston | 8 hr |
| Apr 15, 5:42 AM CDT | Mesoscale Discussion | SPC | Bay, Calhoun, Gulf, Jackson | 93 min |
| Apr 15, 8:34 AM CDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Columbia, Gilchrist, Hamilton and 4 more | 86 min |
| Apr 15, 9:12 AM CDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Citrus, Clay, Columbia and 22 more | 8 hr |
| Apr 15, 11:18 AM CDT | Mesoscale Discussion | SPC | Hardee, Hillsborough, Manatee, Polk | 57 min |
| Apr 15, 1:30 PM CDT | Mesoscale Discussion | SPC | Clay, Duval, Lake, Manatee, Polk, Putnam and 1 more | 90 min |
| Apr 15, 3:42 PM CDT | Mesoscale Discussion | SPC | Broward, Collier, DeSoto, Glades, Hardee, Hendry and 4 more | 63 min |
| Apr 15, 11:13 AM CDT | Tornado Watch | SPC | Burke, Columbia, Lincoln, McDuffie, Richmond | 9 hr |
Nearby
Mesoscale Discussions in Florida, 2018Mesoscale Discussions in Georgia, 2018Mesoscale Discussions in Alabama, 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.