Alert archive / Florida / Mesoscale Discussions in 2012
Mesoscale Discussion 231
The Storm Prediction Center issued this mesoscale discussion at Mar 3, 2012, 12:45 PM EST for 21 counties in Florida; 9 counties in Georgia. It was in force for 60 min.
The area
The outline as issued.
The facts
- Issued
- Mar 3, 2012, 12:45 PM EST (17:45 UTC)
- Expired
- Mar 3, 2012, 1:45 PM EST
- In force
- 60 min
- Issued by
- the Storm Prediction Center
All 30 counties
Alachua County, FL, Baker County, FL, Bradford County, FL, Clay County, FL, Columbia County, FL, Duval County, FL, Flagler County, FL, Gilchrist County, FL, Hamilton County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Nassau County, FL, Putnam County, FL, Saint Johns County, FL, Suwannee County, FL, Taylor County, FL, Union County, FL, Wakulla County, FL, Brantley County, GA, Brooks County, GA, Camden County, GA, Charlton County, GA, Clinch County, GA, Echols County, GA, Lanier County, GA, Lowndes County, GA, Ware County, GA
The watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 5.8 hours before the alert went out and 116 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
- 499 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 472 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 257 m²/s²
- 0-3 km storm-relative helicity
- 283 m²/s²
- Significant tornado parameter
- 0.9
- Supercell composite
- 4.1
The text
As transmitted, in the capitals the NWS used until 2016.
635
ACUS11 KWNS 031746
SWOMCD
SPC MCD 031745
FLZ000-GAZ000-031845-
MESOSCALE DISCUSSION 0231
NWS STORM PREDICTION CENTER NORMAN OK
1145 AM CST SAT MAR 03 2012
AREAS AFFECTED...NRN FL...SE GA
CONCERNING...TORNADO WATCH 68...
VALID 031745Z - 031845Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 68 CONTINUES.
A NEW WW REPLACING WW 68 LIKELY WILL BE ISSUED SOON.
WITH A SIGNIFICANT SHORT WAVE IMPULSE STILL DIGGING UPSTREAM...
TOWARD THE WESTERN/CENTRAL GULF COAST REGION...THE COMPOSITE
NORTHEAST-SOUTHWEST ORIENTED SURFACE FRONT/OUTFLOW BOUNDARY IS
EXPECTED TO ONLY SLOWLY ADVANCE SOUTHWARD THROUGH NORTHERN FLORIDA
THIS AFTERNOON. THE BULK OF THE VIGOROUS CONVECTIVE DEVELOPMENT
LIKELY WILL REMAIN ALONG AND TO THE IMMEDIATE NORTH OF THIS
BOUNDARY...WHERE PERSISTENT/TRAINING ACTIVITY COULD YIELD LOCALLY
EXCESSIVE RAIN TOTALS. HOWEVER...INHIBITION IS GRADUALLY WEAKENING
TO THE IMMEDIATE SOUTH OF THE FRONT...DUE TO CONTINUED SURFACE
HEATING AND WEAK COOLING ALOFT. COUPLED WITH LIFT ASSOCIATED WITH
WARM ADVECTION...DISCRETE STORM DEVELOPMENT APPEARS IMMINENT AROUND
THE JACKSONVILLE AREA. DEEP LAYER AND LOW-LEVEL SHEAR REMAINS
FAVORABLE FOR SUPERCELLS CAPABLE OF PRODUCING AN ISOLATED TORNADO OR
TWO...ALONG WITH LOCALLY DAMAGING WIND GUSTS...PERHAPS SOME HAIL.
..KERR.. 03/03/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...MLB...TBW...JAX...TAE...
LAT...LON 30348527 30698411 31058329 31398192 31248156 30648145
29428118 29138164 29278221 29458252 29978349 29648457
29938522 30348527SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 2, 11:56 PM EST | Tornado Watch | SPC | Escambia | 6 hr |
| Mar 3, 5:47 AM EST | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 10 more | 58 min |
| Mar 3, 7:35 AM EST | Tornado Watch | SPC | Bay, Calhoun, Franklin, Gadsden, Gulf, Hamilton and 9 more | 6 hr |
| Mar 3, 10:12 AM EST | Mesoscale Discussion | SPC | Bay, Calhoun, Gadsden, Hamilton, Jefferson, Leon and 3 more | 93 min |
| Mar 3, 1:04 PM EST | Tornado Watch | SPC | Alachua, Baker, Bradford, Calhoun, Clay, Columbia and 17 more | 5 hr |
| Mar 3, 4:30 PM EST | Mesoscale Discussion | SPC | Baker, Columbia, Hamilton, Lafayette, Nassau, Suwannee and 2 more | 90 min |
| Mar 2, 8:15 PM EST | Mesoscale Discussion | SPC | Catoosa, Dade, Fannin, Gilmer, Murray, Rabun and 4 more | 90 min |
| Mar 2, 8:18 PM EST | Mesoscale Discussion | SPC | Dade | 57 min |
| Mar 2, 9:36 PM EST | Mesoscale Discussion | SPC | Baker, Calhoun, Colquitt, Cook, Decatur, Dougherty and 6 more | 54 min |
| Mar 2, 10:54 PM EST | Tornado Watch | SPC | Banks, Barrow, Bartow, Butts, Carroll, Catoosa and 61 more | 6 hr |
| Mar 2, 11:07 PM EST | Mesoscale Discussion | SPC | Carroll, Clayton, Cobb, Coweta, DeKalb, Douglas and 13 more | 113 min |
| Mar 3, 12:40 AM EST | Mesoscale Discussion | SPC | Banks, Barrow, Bartow, Carroll, Cherokee, Clarke and 30 more | 95 min |
| Mar 3, 3:58 AM EST | Mesoscale Discussion | SPC | Burke, Columbia, Glascock, Jefferson, Jenkins, Lincoln and 6 more | 92 min |
| Mar 3, 4:39 AM EST | Severe Thunderstorm Watch | SPC | Burke, Columbia, Lincoln, McDuffie, Richmond | 4 hr |
Nearby
Mesoscale Discussions in Florida, 2012Mesoscale Discussions in Georgia, 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.