Alert archive / Florida / Mesoscale Discussions in 2003
Mesoscale Discussion 340
The Storm Prediction Center issued this mesoscale discussion at Mar 27, 2003, 10:27 AM EST for 45 counties in Florida. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 27, 2003, 10:27 AM EST (15:27 UTC)
- Expired
- Mar 27, 2003, 12:30 PM EST
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 45 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Brevard County, FL, Broward County, FL, Charlotte County, FL, Citrus County, FL, Clay County, FL, Collier County, FL, Columbia County, FL, DeSoto County, FL, Dixie County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Glades County, FL, Hardee County, FL, Hendry County, FL, Hernando County, FL, Highlands County, FL, Hillsborough County, FL, Indian River County, FL, Lafayette County, FL, Lake County, FL, Lee County, FL, Levy County, FL, Manatee County, FL, Marion County, FL, Martin County, FL, Monroe County, FL, Okeechobee County, FL, Orange County, FL, Osceola County, FL, Palm Beach County, FL, Pasco County, FL, Polk County, FL, Putnam County, FL, Saint Johns County, FL, Saint Lucie County, FL, Sarasota County, FL, Seminole County, FL, Sumter County, FL, Suwannee County, FL, Union County, FL, Volusia County, FL
The radar
The Tampa radar (KTBW), 68 km from the middle of the area, began a volume at 15:27 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 12:00Z, 3.5 hours before the alert went out and 68 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
- 845 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 820 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 166 m²/s²
- 0-3 km storm-relative helicity
- 216 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.8
The text
As transmitted, in the capitals the NWS used until 2016.
157 ACUS11 KWNS 271528 SWOMCD SPC MCD 271527 FLZ000-GAZ000-271730- MESOSCALE DISCUSSION 0340 NWS STORM PREDICTION CENTER NORMAN OK 0927 AM CST THU MAR 27 2003 AREAS AFFECTED...FL CONCERNING...SEVERE THUNDERSTORM POTENTIAL VALID 271527Z - 271730Z SCATTERED CONVECTION WILL GRADUALLY DEVELOP ACROSS FL THROUGH 17Z. AS CELLS ORGANIZE...THE THREAT FOR HAIL..DAMAGING WIND OR AN ISOLATED TORNADO WILL INCREASE. A WEATHER WATCH MAY BE NECESSARY FOR PORTIONS OF CNTRL AND NRN FL LATER THIS MORNING. MOISTURE ADVECTION OVERNIGHT HAS TRANSPORTED DEWPOINTS INTO THE MID TO UPPER 60S ACROSS THE FL PENINSULA PRODUCING MLCAPES TO 1500 J/KG. CONVECTION HAS DEVELOPED ALONG THE AXIS OF INSTABILITY EXISTING ACROSS THE NERN GULF OF MEXICO AND NRN FL. AS SURFACE TEMPERATURES HEAT INTO THE LOW 80S...THE ATMOSPHERE WILL FURTHER DESTABILIZE CAUSING CONVECTIVE DEVELOPMENT OVER LAND. THE MID/UPR-LEVEL JET ACROSS SRN FL HAS INCREASED DEEP LAYER SHEAR ACROSS THE PENINSULA ENOUGH FOR ISOLATED SUPERCELL DEVELOPMENT. THE EXPECTED ACTIVITY WILL BE PRIMARILY HAIL WITH ISOLATED WIND DAMAGE/BRIEF TORNADO. MOST FAVORABLE AREAS WILL BE VICINITY SEA BREEZE/OUTFLOW BOUNDARIES. AREA IS BEING MONITORED AND A WW MAY BE REQUIRED BY 17Z . ..BROYLES.. 03/27/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MFL...MLB...TBW...JAX...TAE... 29498333 30208345 30568237 30308141 27788048 27368033 26068008 25208094 26388190 27068243 27778274 28998314 29498333
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 27, 11:00 AM EST | Severe Thunderstorm Watch | SPC | Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 34 more | 6 hr |
| Mar 27, 1:36 PM EST | Mesoscale Discussion | SPC | Alachua, Baker, Bradford, Brevard, Charlotte, Citrus and 38 more | 84 min |
| Mar 27, 2:15 PM EST | Tornado Watch | SPC | Broward, Collier, Hendry, Miami-Dade, Monroe, Palm Beach | 5 hr |
| Mar 27, 4:10 PM EST | Mesoscale Discussion | SPC | Broward, Collier, Hendry, Miami-Dade, Monroe, Palm Beach | 95 min |
Nearby
Mesoscale Discussions in Florida, 2003Every mesoscale discussion in 2003
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.