Alert archive / Florida / Mesoscale Discussions in 2012
Mesoscale Discussion 1265
The Storm Prediction Center issued this mesoscale discussion at Jun 25, 2012, 12:46 AM EDT for 20 counties in Florida. It was in force for 89 min.
The area
The outline as issued.
The facts
- Issued
- Jun 25, 2012, 12:46 AM EDT (04:46 UTC)
- Expired
- Jun 25, 2012, 2:15 AM EDT
- In force
- 89 min
- Issued by
- the Storm Prediction Center
Counties Alachua County, FL, Charlotte County, FL, Citrus County, FL, DeSoto County, FL, Dixie County, FL, Gilchrist County, FL, Hardee County, FL, Hernando County, FL, Highlands County, FL, Hillsborough County, FL, Lafayette County, FL, Lake County, FL, Marion County, FL, Orange County, FL, Osceola County, FL, Pasco County, FL, Polk County, FL, Seminole County, FL, Sumter County, FL, Taylor County, FL
The radar
The Tampa radar (KTBW), 92 km from the middle of the area, began a volume at 04:47 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
Tampa Bay, FL (KTBW), launched 00:00Z, 4.8 hours before the alert went out and 92 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
- 2192 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 526 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 287 m²/s²
- 0-3 km storm-relative helicity
- 322 m²/s²
- Significant tornado parameter
- 2.4
- Supercell composite
- 15.2
The text
As transmitted, in the capitals the NWS used until 2016.
234
ACUS11 KWNS 250447
SWOMCD
SPC MCD 250446
FLZ000-250615-
MESOSCALE DISCUSSION 1265
NWS STORM PREDICTION CENTER NORMAN OK
1146 PM CDT SUN JUN 24 2012
AREAS AFFECTED...CNTRL AND NRN FL PENINSULA
CONCERNING...TORNADO WATCH 423...
VALID 250446Z - 250615Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 423 CONTINUES.
SUMMARY...THREAT FOR ISOLATED TORNADOES WILL PERSIST NEXT COUPLE
HOURS MAINLY OVER THE WRN HALF OF THE FL PENINSULA.
DISCUSSION...TS DEBBY REMAINS NEARLY STATIONARY AND IS FORECAST BY
NHC TO DRIFT ONLY VERY SLOWLY NWD TONIGHT. THIS WILL LEAVE THE FL
PENINSULA IN A FAVORABLE ZONE EAST OF THE TS CENTER FOR A CONTINUED
THREAT FOR ISOLATED TORNADOES. EXTENSIVE SQUALL LINE THAT MOVED
THROUGH THE FL PENINSULA EARLIER THIS EVENING IS EXITING THE EAST
COAST. BOUNDARY LAYER OVER MUCH OF THE CNTRL FL PENINSULA HAS BEEN
TEMPORARILY STABILIZED IN WAKE OF THIS FEATURE. THE STABILIZING
EFFECTS OF EARLIER CONVECTION AND TIME OF DAY MAY SERVE AS LIMITING
FACTORS FOR A MORE ROBUST THREAT. HOWEVER...RECENT TRENDS HAVE BEEN
FOR SHOWERS TO INCREASE WITHIN CONVERGENCE BANDS OVER THE ERN GULF
AND ALONG THE WRN FL COAST. HODOGRAPHS REMAIN LARGE IN THE PRESENCE
OF RICH LOW LEVEL MOISTURE...AND AT LEAST A MODEST POTENTIAL REMAINS
FOR ISOLATED CELLS WITHIN THE BANDS TO EVOLVE INTO LOW TOPPED
SUPERCELLS WITH AN ATTENDANT TORNADO THREAT.
..DIAL.. 06/25/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MFL...MLB...TBW...JAX...TAE...
LAT...LON 26678214 27758247 29308282 29978430 30238420 30078302
29288132 28398077 26978147 26678214SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 10:16 PM EDT | Mesoscale Discussion | SPC | Brevard, Charlotte, Citrus, Collier, DeSoto, Dixie and 20 more | 59 min |
| Jun 25, 4:07 AM EDT | Mesoscale Discussion | SPC | Bradford, Charlotte, Clay, Collier, DeSoto, Duval and 21 more | 83 min |
| Jun 25, 4:37 AM EDT | Tornado Watch | SPC | Alachua, Brevard, Charlotte, Citrus, Collier, DeSoto and 35 more | 9 hr |
| Jun 25, 12:06 PM EDT | Mesoscale Discussion | SPC | Alachua, Bradford, Brevard, Citrus, Clay, Dixie and 25 more | 54 min |
| Jun 25, 1:48 PM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 45 more | 9 hr |
| Jun 25, 6:27 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 45 more | 63 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.