Alert archive / Florida / Mesoscale Discussions in 2021
Mesoscale Discussion 361
The Storm Prediction Center issued this mesoscale discussion at Apr 10, 2021, 11:49 AM EDT for 6 counties in Florida; 5 counties in Georgia. It was in force for 116 min.
The area
The outline as issued.
The facts
- Issued
- Apr 10, 2021, 11:49 AM EDT (15:49 UTC)
- Expired
- Apr 10, 2021, 1:45 PM EDT
- In force
- 116 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 90
Counties Jefferson County, FL, Lafayette County, FL, Leon County, FL, Madison County, FL, Taylor County, FL, Wakulla County, FL, Brooks County, GA, Colquitt County, GA, Cook County, GA, Grady County, GA, Thomas County, GA
The radar
The Tallahassee radar (KTLH), 31 km from the middle of the area, began a volume at 15:51 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 12:00Z, 3.8 hours before the alert went out and 31 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
- 13 J/kg
- Mixed-layer CIN
- -541 J/kg
- Mixed-layer LCL
- 1046 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 276 m²/s²
- 0-3 km storm-relative helicity
- 231 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
214
ACUS11 KWNS 101549
SWOMCD
SPC MCD 101549
FLZ000-GAZ000-101745-
Mesoscale Discussion 0361
NWS Storm Prediction Center Norman OK
1049 AM CDT Sat Apr 10 2021
Areas affected...eastern portions of the Florida Panhandle and
adjacent southwestern Georgia
Concerning...Tornado Watch 90...
Valid 101549Z - 101745Z
The severe weather threat for Tornado Watch 90 continues.
SUMMARY...Local severe risk -- mainly in the form of damaging wind
gusts -- continues within WW 90.
DISCUSSION...Latest radar loop shows a gradual decrease in overall
intensity along the entire convective band. However, some
organization persists within the onshore portion of the line from
Grady County GA southward to Wakulla County FL. With a small
corridor of 500 to 1000 J/kg mixed-layer CAPE persisting just ahead
of the storms over eastern portions of the Panhandle, limited severe
risk remains apparent over the next 1 to 2 hours.
..Goss.. 04/10/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...JAX...TAE...
LAT...LON 30988442 31198432 31328347 30068312 29298345 28798477
28898552 29508468 30268448 30988442SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 2:52 AM EDT | Mesoscale Discussion | SPC | Escambia, Holmes, Okaloosa, Santa Rosa, Walton, Washington | 113 min |
| Apr 10, 3:30 AM EDT | Tornado Watch | SPC | Bay, Calhoun, Escambia, Gulf, Holmes, Jackson and 4 more | 8 hr |
| Apr 10, 5:06 AM EDT | Mesoscale Discussion | SPC | Escambia, Holmes, Okaloosa, Santa Rosa, Walton, Washington | 114 min |
| Apr 10, 8:10 AM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 8 more | 2 hr |
| Apr 10, 9:58 AM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Dixie, Franklin, Gadsden, Gulf and 9 more | 92 min |
| Apr 10, 10:20 AM EDT | Tornado Watch | SPC | Dixie, Franklin, Gadsden, Jefferson, Lafayette, Leon and 4 more | 4 hr |
| Apr 10, 3:13 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Citrus, Clay, Columbia and 8 more | 2 hr |
Nearby
Mesoscale Discussions in Florida, 2021Mesoscale Discussions in Georgia, 2021Every mesoscale discussion in 2021
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.