Alert archive / Florida / Mesoscale Discussions in 2003
Mesoscale Discussion 577
The Storm Prediction Center issued this mesoscale discussion at Apr 25, 2003, 1:01 PM EDT for 21 counties in Florida; 12 counties in Georgia; Beaufort County, South Carolina. It was in force for 119 min.
The area
The outline as issued.
The facts
- Issued
- Apr 25, 2003, 1:01 PM EDT (17:01 UTC)
- Expired
- Apr 25, 2003, 3:00 PM EDT
- In force
- 119 min
- Issued by
- the Storm Prediction Center
All 34 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Citrus County, FL, Clay County, FL, Columbia County, FL, Dixie County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hernando County, FL, Lake County, FL, Levy County, FL, Marion County, FL, Nassau County, FL, Pasco County, FL, Putnam County, FL, Saint Johns County, FL, Sumter County, FL, Union County, FL, Volusia County, FL, Brantley County, GA, Bryan County, GA, Camden County, GA, Charlton County, GA, Chatham County, GA, Glynn County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA, Beaufort County, SC
The radar
The Jacksonville radar (KJAX), 49 km from the middle of the area, began a volume at 17:00 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
Jacksonville, FL (KJAX), launched 12:00Z, 5.0 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
- 109 J/kg
- Mixed-layer CIN
- -260 J/kg
- Mixed-layer LCL
- 1059 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 174 m²/s²
- 0-3 km storm-relative helicity
- 283 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
878 ACUS11 KWNS 251702 SWOMCD SPC MCD 251701 FLZ000-SCZ000-GAZ000-251900- MESOSCALE DISCUSSION 0577 NWS STORM PREDICTION CENTER NORMAN OK 1201 PM CDT FRI APR 25 2003 AREAS AFFECTED...SE GA...NRN FL...PARTS OF CNTRL FL PEN CONCERNING...SEVERE THUNDERSTORM WATCH 164... VALID 251701Z - 251900Z NEW WW MAY BE NEEDED SOUTH OF WW 164 WITHIN NEXT COUPLE OF HOURS. MORNING SOUNDINGS AND LATEST MODEL PROGS HAVE SUGGESTED SUFFICIENTLY LOW RELATIVE HUMIDITIES IN LOWER/MID-LEVELS TO ENHANCE EVAPORATIVE COOLING IN DOWNDRAFTS ACROSS SOUTHERN GEORGIA/NORTHERN FLORIDA. EVOLVING SURFACE COLD POOL APPEARS TO BE STRENGTHENING... PARTICULARLY WITH SURFACE TEMPERATURES HEATING INTO THE 80S AHEAD OF SQUALL LINE ACROSS NORTHERN FLORIDA AND NORTHERN PORTIONS OF THE PENINSULA. MODELS SUGGEST 30 KT SOUTHERLY LOW-LEVEL JET EXTENDS AS FAR SOUTH AS THE TAMPA/MELBOURNE AREAS BY LATE AFTERNOON...WITH DOWNWARD TRANSFER OF THIS MOMENTUM ENHANCING POTENTIAL FOR DAMAGING WIND GUSTS. ..KERR.. 04/25/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...MLB...TBW...CHS...JAX...TAE... 29028099 28388173 28268250 28538268 29538341 30048300 30568284 31268251 31998162 32388101 32388053
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 25, 4:05 AM EDT | Mesoscale Discussion | SPC | Escambia | 85 min |
| Apr 25, 6:40 AM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Holmes, Jackson, Okaloosa and 3 more | 65 min |
| Apr 25, 7:05 AM EDT | Tornado Watch | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 7 more | 6 hr |
| Apr 25, 8:41 AM EDT | Mesoscale Discussion | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Holmes and 6 more | 94 min |
| Apr 25, 10:22 AM EDT | Mesoscale Discussion | SPC | Gadsden, Hamilton, Jefferson, Leon, Liberty, Madison and 1 more | 113 min |
| Apr 25, 11:45 AM EDT | Severe Thunderstorm Watch | SPC | Baker, Columbia, Hamilton, Jefferson, Lafayette, Madison and 3 more | 5 hr |
| Apr 25, 2:15 PM EDT | Severe Thunderstorm Watch | SPC | Alachua, Bradford, Citrus, Clay, Duval, Flagler and 10 more | 5 hr |
| Apr 25, 3:17 PM EDT | Mesoscale Discussion | SPC | Alachua, Bradford, Citrus, Clay, Duval, Flagler and 10 more | 118 min |
| Apr 25, 6:35 PM EDT | Mesoscale Discussion | SPC | Citrus, Hernando, Lake, Orange, Pasco, Seminole and 2 more | 55 min |
| Apr 25, 1:45 PM EDT | Tornado Watch | SPC | Catoosa, Chattooga, Dade, Floyd, Walker | 5 hr |
| Apr 25, 4:08 PM EDT | Mesoscale Discussion | SPC | Carroll, Chattahoochee, Clayton, Cobb, Coweta, Douglas and 17 more | 2 hr |
| Apr 25, 6:00 PM EDT | Tornado Watch | SPC | Barrow, Bartow, Bibb, Butts, Carroll, Catoosa and 51 more | 5 hr |
Nearby
Mesoscale Discussions in Florida, 2003Mesoscale Discussions in Georgia, 2003Mesoscale Discussions in South Carolina, 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.