Alert archive / Florida / Mesoscale Discussions in 2020
Mesoscale Discussion 458
The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2020, 12:05 PM CDT for 6 counties in Florida. It was in force for 55 min.
The area
The outline as issued.
The facts
- Issued
- Apr 23, 2020, 12:05 PM CDT (17:05 UTC)
- Expired
- Apr 23, 2020, 1:00 PM CDT
- In force
- 55 min
- Issued by
- the Storm Prediction Center
Counties Bay County, FL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL, Washington County, FL
The radar
The Eglin Afb radar (KEVX), 43 km from the middle of the area, began a volume at 17:05 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, 5.1 hours before the alert went out and 199 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
- 1318 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- 455 m²/s²
- 0-3 km storm-relative helicity
- 663 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 23, 2:28 AM CDT | Mesoscale Discussion | SPC | Escambia, Santa Rosa | 92 min |
| Apr 23, 4:05 AM CDT | Tornado Watch | SPC | Bay, Calhoun, Escambia, Holmes, Jackson, Okaloosa and 3 more | 11 hr |
| Apr 23, 7:43 AM CDT | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 10 more | 92 min |
| Apr 23, 9:29 AM CDT | Mesoscale Discussion | SPC | Baker, Columbia, Gadsden, Hamilton, Jackson, Jefferson and 5 more | 61 min |
| Apr 23, 9:52 AM CDT | Tornado Watch | SPC | Franklin, Gadsden, Gulf, Hamilton, Jefferson, Leon and 4 more | 6 hr |
| Apr 23, 2:28 PM CDT | Mesoscale Discussion | SPC | Bay, Calhoun, Franklin, Gulf, Jefferson, Leon and 6 more | 62 min |
| Apr 23, 2:47 PM CDT | Tornado Watch | SPC | Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 11 more | 6 hr |
| Apr 23, 5:09 PM CDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Calhoun, Clay, Columbia and 17 more | 96 min |
| Apr 23, 5:52 PM CDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 7 more | 5 hr |
Nearby
Mesoscale Discussions in Florida, 2020Every mesoscale discussion 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.