Alert archive / Georgia / Mesoscale Discussions in 2012
Mesoscale Discussion 2228
The Storm Prediction Center issued this mesoscale discussion at Dec 26, 2012, 2:55 AM CST for 4 counties in Florida; 20 counties in Georgia. It was in force for 65 min.
The area
The outline as issued.
The facts
- Issued
- Dec 26, 2012, 2:55 AM CST (08:55 UTC)
- Expired
- Dec 26, 2012, 4:00 AM CST
- In force
- 65 min
- Issued by
- the Storm Prediction Center
All 24 counties
Calhoun County, FL, Gadsden County, FL, Gulf County, FL, Liberty County, FL, Baker County, GA, Bibb County, GA, Calhoun County, GA, Crawford County, GA, Decatur County, GA, Dougherty County, GA, Early County, GA, Lee County, GA, Macon County, GA, Marion County, GA, Miller County, GA, Peach County, GA, Randolph County, GA, Schley County, GA, Seminole County, GA, Sumter County, GA, Taylor County, GA, Terrell County, GA, Upson County, GA, Webster County, GA
The nearest sounding before it
Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 8.9 hours before the alert went out and 141 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1109 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 232 m²/s²
- 0-3 km storm-relative helicity
- 410 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
543 ACUS11 KWNS 260856 SWOMCD SPC MCD 260855 GAZ000-FLZ000-ALZ000-261000- MESOSCALE DISCUSSION 2228 NWS STORM PREDICTION CENTER NORMAN OK 0255 AM CST WED DEC 26 2012 AREAS AFFECTED...PORTIONS OF SWRN GA AND CENTRAL FL PANHANDLE CONCERNING...TORNADO WATCH 698... VALID 260855Z - 261000Z THE SEVERE WEATHER THREAT FOR TORNADO WATCH 698 CONTINUES. SUMMARY...TSTMS WILL LIKELY CLEAR REMAINING PORTIONS OF WW 698 BY 09Z. A LOCAL WFO EXTENSION MAY BE NEEDED ACROSS FL PANHANDLE PORTION OF WW HOWEVER OVERALL TRENDS SUGGEST A NEW WW WILL NOT BE NEEDED. DISCUSSION...LINE OF TSTMS CONTINUES TO MOVE EWD AND WILL EXIT REMAINING VALID PORTIONS OF WW 698 BY AROUND 09Z. LATEST MESOANALYSIS DATA INDICATES A NARROW AXIS OF MUCAPE OF 500-1000 J/KG EXISTS ACROSS CENTRAL FL PANHANDLE AND INTO EXTREME SWRN GA. IN ADDITION...0-1 KM SRH VALUES OF 350 M2/S2 OR HIGHER IN THIS REGION SUGGESTS AT LEAST SOME POTENTIAL FOR LOW-LEVEL ROTATION FOR AN ADDITIONAL 1 TO 2 HOURS. IN ADDITION...RADAR DATA FROM KTLH HAS DETECTED BRIEF CIRCULATIONS WITHIN CONVECTIVE LINE. THUS...A LOCAL WFO EXTENSION OF WW 698 TO THE EAST OF THE CURRENT AREA MAY BE NEEDED. ELSEWHERE...TSTMS WILL BE MOVING EAST OF THE INSTABILITY AXIS AFTER 09Z AND INTO A LESS FAVORABLE ENVIRONMENT. THUS..A NEW WW IS NOT ANTICIPATED ATTM. ..BUNTING/MEAD.. 12/26/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...FFC...TAE... LAT...LON 32988432 32988357 29678485 29688555 32988432
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 25, 8:49 PM CST | Mesoscale Discussion | SPC | Bay, Calhoun, Escambia, Gulf, Holmes, Jackson and 5 more | 56 min |
| Dec 25, 9:23 PM CST | Tornado Watch | SPC | Bay, Calhoun, Escambia, Franklin, Gadsden, Gulf and 9 more | 6 hr |
| Dec 25, 11:10 PM CST | Mesoscale Discussion | SPC | Bay, Calhoun, Gadsden, Gulf, Holmes, Jackson and 3 more | 95 min |
Nearby
Mesoscale Discussions in Georgia, 2012Mesoscale 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.