Alert archive / Florida / Mesoscale Discussions in 2021
Mesoscale Discussion 2051
The Storm Prediction Center issued this mesoscale discussion at Dec 21, 2021, 8:01 AM EST for 8 counties in Florida. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- Dec 21, 2021, 8:01 AM EST (13:01 UTC)
- Expired
- Dec 21, 2021, 9:30 AM EST
- In force
- 89 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 568
Counties Charlotte County, FL, Collier County, FL, DeSoto County, FL, Hardee County, FL, Hendry County, FL, Lee County, FL, Manatee County, FL, Sarasota County, FL
The radar
The Tampa radar (KTBW), 99 km from the middle of the area, began a volume at 13:04 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
Tampa Bay, FL (KTBW), launched 12:00Z, 1.0 hours before the alert went out and 99 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
- 123 J/kg
- Mixed-layer CIN
- -150 J/kg
- Mixed-layer LCL
- 533 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 260 m²/s²
- 0-3 km storm-relative helicity
- 340 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted.
675
ACUS11 KWNS 211302
SWOMCD
SPC MCD 211301
FLZ000-211430-
Mesoscale Discussion 2051
NWS Storm Prediction Center Norman OK
0701 AM CST Tue Dec 21 2021
Areas affected...South FL
Concerning...Tornado Watch 568...
Valid 211301Z - 211430Z
The severe weather threat for Tornado Watch 568 continues.
SUMMARY...Damaging wind gusts are possible with the stronger storm
moving into the SRQ vicinity.
DISCUSSION...Recent surface analysis places the warm front from VNC
eastward across the FL Peninsula to PBI. Am earlier supercell
dissipated at is moved onshore near Fort Myers, with showers now
covering much of the watch area south of the warm front. A stronger
thunderstorm is moving eastward towards SRQ, just north of the warm
front. Primary severe threat with this storm is damaging wind gusts.
Position of this storm north of the warm front suggest the tornado
potential is low, although the veering low-level wind profile
(sampled well by the TBW VAD) suggests the threat is non zero.
..Mosier.. 12/21/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...MFL...TBW...
LAT...LON 27358278 27608259 27578188 27388151 26858120 26178108
25778161 25968202 26918245 27358278SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 21, 4:33 AM EST | Mesoscale Discussion | SPC | Charlotte, Collier, DeSoto, Glades, Hardee, Hendry and 3 more | 2 hr |
| Dec 21, 5:22 AM EST | Tornado Watch | SPC | Charlotte, Collier, DeSoto, Glades, Hardee, Hendry and 4 more | 5 hr |
| Dec 21, 9:34 AM EST | Mesoscale Discussion | SPC | Charlotte, Collier, DeSoto, Glades, Hardee, Hendry and 4 more | 26 min |
Nearby
Mesoscale Discussions in Florida, 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.