Alert archive / Florida / Mesoscale Discussions in 2012
Mesoscale Discussion 1173
The Storm Prediction Center issued this mesoscale discussion at Jun 15, 2012, 3:11 PM EDT for 13 counties in Florida. It was in force for 64 min.
The area
The outline as issued.
The facts
- Issued
- Jun 15, 2012, 3:11 PM EDT (19:11 UTC)
- Expired
- Jun 15, 2012, 4:15 PM EDT
- In force
- 64 min
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
Counties Broward County, FL, Charlotte County, FL, Collier County, FL, DeSoto County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Highlands County, FL, Lee County, FL, Manatee County, FL, Miami-Dade County, FL, Monroe County, FL, Palm Beach County, FL
The radar
The Miami radar (KAMX), 141 km from the middle of the area, began a volume at 19:13 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Miami, FL (KMFL), launched 12:00Z, 7.2 hours before the alert went out and 134 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
- 1194 J/kg
- Mixed-layer CIN
- -61 J/kg
- Mixed-layer LCL
- 805 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 26 m²/s²
- 0-3 km storm-relative helicity
- 48 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
841
ACUS11 KWNS 151911
SWOMCD
SPC MCD 151911
FLZ000-152015-
MESOSCALE DISCUSSION 1173
NWS STORM PREDICTION CENTER NORMAN OK
0211 PM CDT FRI JUN 15 2012
AREAS AFFECTED...SRN FL
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 151911Z - 152015Z
PROBABILITY OF WATCH ISSUANCE...20 PERCENT
SUMMARY...ISOLATED SEVERE WIND/HAIL WILL EXIST THROUGH THE AFTERNOON
AS THUNDERSTORMS DEVELOP ALONG THE SEA-BREEZE ACROSS SRN FL.
ISOLATED NATURE OF THE SEVERE THREAT IS EXPECTED TO PRECLUDE THE
NEED FOR A WW.
DISCUSSION...AMPLE INSTABILITY AND INCREASED CONVERGENCE ALONG
MULTIPLE MESOSCALE BOUNDARIES WILL LEAD TO AN ISOLATED SEVERE THREAT
THROUGH THE AFTERNOON ACROSS SRN FL. WWD/SWWD PROGRESSING CONFLUENCE
BAND /LOCATED ROUGHLY ALONG A LINE FROM VDF SEWD TO BCT/ WILL LIKELY
INTERSECT THE W COAST SEA-BREEZE THIS AFTERNOON...ENHANCING SURFACE
CONVERGENCE AND AIDING IN THUNDERSTORM DEVELOPMENT. 18Z MESOANALYSIS
DEPICTED MLCAPE AOA 1500 J/KG AND EFFECTIVE SHEAR VALUES NEAR 25 KTS
ACROSS MUCH OF SRN FL. THIS SUGGESTS BRIEFLY ORGANIZED MULTICELLS
WITH AN ISOLATED THREAT FOR SEVERE HAIL/WIND. ISOLATED NATURE OF THE
SEVERE THREAT IS EXPECTED TO PRECLUDE THE NEED FOR A WW.
..MOSIER/HART.. 06/15/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MFL...TBW...
LAT...LON 25288077 25648128 26158171 26908226 27498248 27718225
27748182 27608157 27028087 26458003 25488037 25288077SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 15, 3:56 PM EDT | Severe Thunderstorm Watch | SPC | Broward, Charlotte, Collier, DeSoto, Glades, Hardee and 8 more | 5 hr |
| Jun 15, 7:13 PM EDT | Mesoscale Discussion | SPC | Broward, Charlotte, Collier, DeSoto, Glades, Hardee and 7 more | 62 min |
Nearby
Mesoscale Discussions in Florida, 2012Every mesoscale discussion in 2012
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.