Alert archive / Florida / Mesoscale Discussions in 2021
Mesoscale Discussion 1176
The Storm Prediction Center issued this mesoscale discussion at Jul 7, 2021, 7:06 AM EDT for 16 counties in Florida. It was in force for 54 min.
The area
The outline as issued.
The facts
- Issued
- Jul 7, 2021, 7:06 AM EDT (11:06 UTC)
- Expired
- Jul 7, 2021, 8:00 AM EDT
- In force
- 54 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 340
Counties Charlotte County, FL, Citrus County, FL, DeSoto County, FL, Hardee County, FL, Hernando County, FL, Highlands County, FL, Hillsborough County, FL, Lake County, FL, Lee County, FL, Levy County, FL, Manatee County, FL, Pasco County, FL, Pinellas County, FL, Polk County, FL, Sarasota County, FL, Sumter County, FL
The radar
The Tampa radar (KTBW), 27 km from the middle of the area, began a volume at 11:09 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 00:00Z, 11.1 hours before the alert went out and 27 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
- 46 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 1020 m above ground
- 0-6 km bulk shear
- 3 kt
- 0-1 km storm-relative helicity
- 60 m²/s²
- 0-3 km storm-relative helicity
- 266 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
691
ACUS11 KWNS 071106
SWOMCD
SPC MCD 071106
FLZ000-071200-
Mesoscale Discussion 1176
NWS Storm Prediction Center Norman OK
0606 AM CDT Wed Jul 07 2021
Areas affected...western and central Florida
Concerning...Tornado Watch 340...
Valid 071106Z - 071200Z
The severe weather threat for Tornado Watch 340 continues.
SUMMARY...Tornado risk has diminished a bit over the past 1 to 2
hours. With WW 340 set to expire at 07/12Z, a replacement WW may
not be required.
DISCUSSION...As Tropical Storm Elsa continues shifting slowly
northward, weakening of the primary convective band east of the
center has occurred, over the Peninsula. Accordingly, low-level
circulations have become less numerous and weaker over the past hour
or so.
While tornado risk will remain non-zero, particularly near and north
of the Tampa area with a secondary band of convection east/southeast
of the center of circulation where low-level flow remains more
backed, at this time it appears that a replacement WW -- south of
newly issued Tornado Watch 341 over northern Florida -- may not be
required.
..Goss.. 07/07/2021
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...MFL...MLB...TBW...JAX...
LAT...LON 29278319 29408267 29058170 27938136 26798131 25788166
25738230 27708293 28468294 29278319SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 6, 10:37 PM EDT | Tornado Watch | SPC | Alachua, Charlotte, Citrus, Collier, DeSoto, Gilchrist and 22 more | 9 hr |
| Jul 6, 11:59 PM EDT | Mesoscale Discussion | SPC | Charlotte, DeSoto, Hardee, Hillsborough | 2 hr |
| Jul 7, 3:03 AM EDT | Mesoscale Discussion | SPC | Charlotte, Citrus, DeSoto, Hardee, Hernando, Hillsborough and 5 more | 117 min |
| Jul 7, 5:42 AM EDT | Mesoscale Discussion | SPC | Alachua, Bradford, Charlotte, Citrus, Columbia, DeSoto and 19 more | 2 hr |
| Jul 7, 6:46 AM EDT | Tornado Watch | SPC | Baker, Bradford, Clay, Columbia, Duval, Hamilton and 4 more | 6 hr |
| Jul 7, 10:30 AM EDT | Mesoscale Discussion | SPC | Baker, Bradford, Clay, Columbia, Duval, Hamilton and 3 more | 2 hr |
| Jul 7, 12:28 PM EDT | Mesoscale Discussion | SPC | Baker, Bradford, Clay, Columbia, Duval, Nassau and 1 more | 2 hr |
| Jul 7, 1:04 PM EDT | Tornado Watch | SPC | Baker, Bradford, Clay, Columbia, Duval, Hamilton and 3 more | 7 hr |
| Jul 7, 4:47 PM EDT | Mesoscale Discussion | SPC | Baker, Clay, Columbia, Duval, Nassau, Saint Johns and 1 more | 118 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.