Alert archive / Florida / Mesoscale Discussions in 2024
Mesoscale Discussion 2139
The Storm Prediction Center issued this mesoscale discussion at Oct 9, 2024, 12:35 PM EDT for Broward County, Hendry County, Palm Beach County, Florida. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Oct 9, 2024, 12:35 PM EDT (16:35 UTC)
- Expired
- Oct 9, 2024, 2:00 PM EDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
- Concerning
- Tornado watch 690
Counties Broward County, FL, Hendry County, FL, Palm Beach County, FL
The radar
The Miami radar (KAMX), 84 km from the middle of the area, began a volume at 16:34 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
Miami, FL (KMFL), launched 12:00Z, 4.6 hours before the alert went out and 67 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
- 1797 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 686 m above ground
- 0-6 km bulk shear
- 38 kt
- 0-1 km storm-relative helicity
- 192 m²/s²
- 0-3 km storm-relative helicity
- 255 m²/s²
- Significant tornado parameter
- 1.1
- Supercell composite
- 9.2
The text
As transmitted.
993
ACUS11 KWNS 091635
SWOMCD
SPC MCD 091635
FLZ000-091800-
Mesoscale Discussion 2139
NWS Storm Prediction Center Norman OK
1135 AM CDT Wed Oct 09 2024
Areas affected...Portions of South Florida
Concerning...Tornado Watch 690...
Valid 091635Z - 091800Z
The severe weather threat for Tornado Watch 690 continues.
SUMMARY...Tornadoes remain possible south of Lake Okeechobee with
developing/deepening updrafts.
DISCUSSION...Temperatures in South Florida have risen into the upper
80s to near 90 F. Several updrafts have began to develop and deepen
south of Lake Okeechobee per local radar ZDR data. Should these
updrafts sufficiently deepen, they will be capable of producing
tornadoes as the low-level flow is only expected to intensify
through the day as Hurricane Milton continues east and its wind
field expands. The greatest potential will be with storms closer to
the eastern coast as cloud cover has been less abundant. Further,
low-level winds are more backed with northward extent which will
increase tornado potential there as well.
..Wendt.. 10/09/2024
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...MFL...
LAT...LON 26538027 26248035 26008042 25588068 25618087 26398132
26788102 26938057 26878033 26538027SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 9, 12:31 AM EDT | Mesoscale Discussion | SPC | Monroe | 89 min |
| Oct 9, 5:45 AM EDT | Mesoscale Discussion | SPC | Broward, Charlotte, Collier, Glades, Hendry, Lee and 4 more | 4 hr |
| Oct 9, 8:20 AM EDT | Tornado Watch | SPC | Brevard, Broward, Charlotte, Collier, DeSoto, Glades and 24 more | 13 hr |
| Oct 9, 10:19 AM EDT | Mesoscale Discussion | SPC | Broward, Collier, Hendry, Palm Beach | 86 min |
| Oct 9, 11:12 AM EDT | Mesoscale Discussion | SPC | Charlotte, Lee | 93 min |
| Oct 9, 11:50 AM EDT | Mesoscale Discussion | SPC | Glades, Hendry, Highlands, Indian River, Martin, Okeechobee and 3 more | 115 min |
| Oct 9, 1:13 PM EDT | Mesoscale Discussion | SPC | Charlotte, Collier, DeSoto, Lee, Manatee, Sarasota | 92 min |
| Oct 9, 1:51 PM EDT | Mesoscale Discussion | SPC | Brevard, Indian River, Martin, Okeechobee, Orange, Osceola and 2 more | 84 min |
| Oct 9, 2:49 PM EDT | Mesoscale Discussion | SPC | Brevard, Broward, Indian River, Martin, Okeechobee, Osceola and 3 more | 86 min |
| Oct 9, 4:15 PM EDT | Mesoscale Discussion | SPC | Brevard, Broward, Indian River, Martin, Okeechobee, Osceola and 2 more | 90 min |
| Oct 9, 6:22 PM EDT | Mesoscale Discussion | SPC | Brevard, Glades, Hardee, Hendry, Hernando, Highlands and 14 more | 113 min |
Nearby
Mesoscale Discussions in Florida, 2024Every mesoscale discussion in 2024
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.