Alert archive / Florida / Mesoscale Discussions in 2004
Mesoscale Discussion 2175
The Storm Prediction Center issued this mesoscale discussion at Sep 6, 2004, 7:48 AM EDT for 14 counties in Florida. It was in force for 87 min.
The area
The outline as issued.
The facts
- Issued
- Sep 6, 2004, 7:48 AM EDT (11:48 UTC)
- Expired
- Sep 6, 2004, 9:15 AM EDT
- In force
- 87 min
- Issued by
- the Storm Prediction Center
Counties Brevard County, FL, Charlotte County, FL, DeSoto County, FL, Hardee County, FL, Highlands County, FL, Lake County, FL, Lee County, FL, Manatee County, FL, Orange County, FL, Osceola County, FL, Polk County, FL, Sarasota County, FL, Seminole County, FL, Volusia County, FL
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, 11.8 hours before the alert went out and 51 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
- 44 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 2432 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 52 m²/s²
- 0-3 km storm-relative helicity
- 155 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
665 ACUS11 KWNS 061151 SWOMCD SPC MCD 061148 FLZ000-061315- MESOSCALE DISCUSSION 2175 NWS STORM PREDICTION CENTER NORMAN OK 0648 AM CDT MON SEP 06 2004 AREAS AFFECTED...CNTRL PENINSULA CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 061148Z - 061315Z POTENTIAL FOR TORNADOES WILL PERSIST ACROSS THE AREA THIS MORNING. WW IS BEING ISSUED. RADAR/IR SATELLITE IMAGERY INDICATE INTENSIFYING CONVECTIVE ELEMENTS WITHIN RAINBAND FROM JUST S OF CHARLOTTE HARBOR NEWD INTO POLK/OSCEOLA COUNTIES ON BACKSIDE OF FRANCES CIRCULATION. IT APPEARS THAT LOCALIZED BOUNDARY-LAYER CONVERGENCE IS OVERCOMING BROADER-SCALE PRESSURE RISES AND ENHANCING THIS CONVECTIVE BAND. CURRENT TAMPA AND MELBOURNE VWPS INDICATE STRONG LOW-LEVEL SHEAR THROUGH THIS SAME CORRIDOR WITH 0-1 KM SRH VALUES OF 300-400 J/KG. THOUGH INSTABILITY REMAINS MARGINAL WITH MLCAPES OF AROUND 500 J/KG...CURRENT VISIBLE IMAGERY DOES SUGGEST SOME POTENTIAL FOR DAYTIME HEATING AND RESULTANT DESTABILIZATION. GIVEN THE ANTICIPATED DECREASE IN STABILITY AND STRONG SHEAR PROFILES...ENVIRONMENT IS EXPECTED TO BECOME INCREASINGLY FAVORABLE FOR ISOLATED SUPERCELLS AND BRIEF TORNADOES. ..MEAD.. 09/06/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MFL...MLB...TBW...JAX... 26468306 28428201 29318149 29018089 28168049 26358174 25948274
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 5, 8:35 PM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 21 more | 9 hr |
| Sep 6, 12:12 AM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 21 more | 2 hr |
| Sep 6, 4:06 AM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 21 more | 84 min |
| Sep 6, 4:50 AM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Clay, Columbia, Dixie and 11 more | 9 hr |
| Sep 6, 7:55 AM EDT | Tornado Watch | SPC | Brevard, Charlotte, Citrus, DeSoto, Glades, Hardee and 21 more | 6 hr |
| Sep 6, 12:28 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 36 more | 92 min |
| Sep 6, 1:20 PM EDT | Tornado Watch | SPC | Alachua, Baker, Bradford, Brevard, Citrus, Clay and 38 more | 7 hr |
| Sep 6, 3:55 PM EDT | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Clay, Columbia, Duval and 10 more | 2 hr |
| Sep 6, 7:12 PM EDT | Mesoscale Discussion | SPC | Baker, Columbia, Duval, Nassau, Union | 2 hr |
| Sep 6, 7:45 PM EDT | Tornado Watch | SPC | Bradford, Clay, Duval, Flagler, Nassau, Putnam and 1 more | 9 hr |
Nearby
Mesoscale Discussions in Florida, 2004Every mesoscale discussion in 2004
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.