Alert archive / Alabama / Mesoscale Discussions in 2012
Mesoscale Discussion 467
The Storm Prediction Center issued this mesoscale discussion at Apr 5, 2012, 7:54 PM CDT for 28 counties in Alabama; Holmes County, Florida; 11 counties in Georgia. It was in force for 96 min.
The area
The outline as issued.
The facts
- Issued
- Apr 5, 2012, 7:54 PM CDT (00:54 UTC)
- Expired
- Apr 5, 2012, 9:30 PM CDT
- In force
- 96 min
- Issued by
- the Storm Prediction Center
All 40 counties
Autauga County, AL, Barbour County, AL, Bullock County, AL, Butler County, AL, Calhoun County, AL, Chambers County, AL, Cherokee County, AL, Clay County, AL, Cleburne County, AL, Coffee County, AL, Coosa County, AL, Covington County, AL, Crenshaw County, AL, Dale County, AL, Elmore County, AL, Geneva County, AL, Henry County, AL, Houston County, AL, Lee County, AL, Lowndes County, AL, Macon County, AL, Montgomery County, AL, Pike County, AL, Randolph County, AL, Russell County, AL, St. Clair County, AL, Talladega County, AL, Tallapoosa County, AL, Holmes County, FL, Chattahoochee County, GA, Clay County, GA, Early County, GA, Haralson County, GA, Harris County, GA, Heard County, GA, Muscogee County, GA, Quitman County, GA, Randolph County, GA, Stewart County, GA, Troup County, GA
The nearest sounding before it
Birmingham, AL (KBMX), launched 00:00Z, 0.9 hours before the alert went out and 113 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
- 242 J/kg
- Mixed-layer CIN
- -32 J/kg
- Mixed-layer LCL
- 1349 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- 88 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.3
The text
As transmitted, in the capitals the NWS used until 2016.
750
ACUS11 KWNS 060055
SWOMCD
SPC MCD 060054
GAZ000-FLZ000-ALZ000-060230-
MESOSCALE DISCUSSION 0467
NWS STORM PREDICTION CENTER NORMAN OK
0754 PM CDT THU APR 05 2012
AREAS AFFECTED...ERN AL...FAR WRN GA...WRN FL PANHANDLE
CONCERNING...SEVERE THUNDERSTORM WATCH 149...
VALID 060054Z - 060230Z
THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 149
CONTINUES.
THE SEVERE THREAT SHOULD CONTINUE ACROSS WW 149 THIS EVENING WHERE
LARGE HAIL AND WIND DAMAGE WILL BE POSSIBLE. THE THREAT SHOULD
DEVELOP SEWD WITH TIME AND MAY AFFECT SE AL AND SW GA LATER THIS
EVENING.
A BROKEN LINE OF STRONG TO SEVERE THUNDERSTORMS IS ONGOING IN ECNTRL
AL LOCATED JUST AHEAD OF A COLD FRONT. SFC DEWPOINTS AHEAD OF THE
FRONT ARE IN THE UPPER 50S F AND LOWER 60S F WITH MLCAPE ESTIMATED
IN THE 500 TO 1000 J/KG RANGE. IN ADDITION...MESOANALYSIS SHOWS A
WELL-DEFINED 55 TO 70 KT MID-LEVEL JET NOSING INTO THE REGION FROM
THE WEST. THIS IS CREATING A STRONGLY SHEARED ENVIRONMENT WITH THE
BIRMINGHAM 00Z SOUNDING SHOWING 60 KT OF 0-6 KM SHEAR. THIS
ENVIRONMENT SHOULD BE SUFFICIENT FOR SUPERCELLS WITH LARGE HAIL. THE
WIND DAMAGE THREAT MAY INCREASE ESPECIALLY IF CURRENT RADAR TRENDS
PERSIST WHICH SHOW A LINE COULD BE DEVELOPING IN CNTRL AL. AS THE
STORMS APPROACH THE AL-GA STATE-LINE...SOME WEAKENING MAY OCCUR DUE
TO A SHARP DROP OFF IN INSTABILITY.
..BROYLES.. 04/06/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FFC...TAE...BMX...MOB...
LAT...LON 33818515 34128559 34048606 33768640 33338663 32838672
32458676 31298680 30858661 30688587 30898507 31208477
32098468 33818515SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 6, 7:44 AM CDT | Mesoscale Discussion | SPC | Broward, Collier, Hendry, Miami-Dade, Monroe, Palm Beach | 91 min |
Nearby
Mesoscale Discussions in Alabama, 2012Mesoscale 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.