Alert archive / Florida / Mesoscale Discussions in 2021
Mesoscale Discussion 1166
The Storm Prediction Center issued this mesoscale discussion at Jul 6, 2021, 4:55 PM EDT for 15 counties in Florida. It was in force for 95 min.
The area
The outline as issued.
The facts
- Issued
- Jul 6, 2021, 4:55 PM EDT (20:55 UTC)
- Expired
- Jul 6, 2021, 6:30 PM EDT
- In force
- 95 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 337
Counties Charlotte County, FL, Collier County, FL, DeSoto County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Highlands County, FL, Hillsborough County, FL, Lee County, FL, Manatee County, FL, Monroe County, FL, Okeechobee County, FL, Pinellas County, FL, Polk County, FL, Sarasota County, FL
The radar
The Tampa radar (KTBW), 155 km from the middle of the area, began a volume at 20:56 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, 8.9 hours before the alert went out and 155 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
- 815 J/kg
- Mixed-layer CIN
- -46 J/kg
- Mixed-layer LCL
- 773 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 29 m²/s²
- 0-3 km storm-relative helicity
- 25 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
004
ACUS11 KWNS 062056
SWOMCD
SPC MCD 062055
FLZ000-062230-
Mesoscale Discussion 1166
NWS Storm Prediction Center Norman OK
0355 PM CDT Tue Jul 06 2021
Areas affected...Southern/central Florida and the FL Keys
Concerning...Tornado Watch 337...
Valid 062055Z - 062230Z
The severe weather threat for Tornado Watch 337 continues.
SUMMARY...The threat for a few tornadoes continues across the watch
area through this evening.
DISCUSSION...Tropical Storm Elsa continues to move north at 10 mph
west of the Florida west coast, and was located 155 miles south
southwest of Tampa at 2045z (see the latest NHC advisory for
complete details). Low-level wind fields will strengthen slightly
over the next several hours as the system continues to slowly
intensify, and this will result in an increase in effective SRH
across portions of southern/central FL. Latest hi-res guidance
suggests an uptick in the intensity of outer bands across mainly
western portions of the watch area this evening, with a
corresponding increase in the risk for a few tornadoes.
..Bunting.. 07/06/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...MFL...MLB...KEY...TBW...
LAT...LON 28158323 28258139 27298069 25788056 24908072 24608149
24538191 26358246 28158323SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 10:34 AM EDT | Mesoscale Discussion | SPC | Charlotte, Collier, DeSoto, Glades, Hardee, Hendry and 12 more | 2 hr |
| Jul 6, 1:47 PM EDT | Tornado Watch | SPC | Broward, Charlotte, Collier, DeSoto, Glades, Hardee and 15 more | 9 hr |
| Jul 6, 7:17 PM EDT | Mesoscale Discussion | SPC | Charlotte, Collier, Lee | 3 hr |
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.