Alert archive / Alabama / Mesoscale Discussions in 2004
Mesoscale Discussion 2513
The Storm Prediction Center issued this mesoscale discussion at Dec 7, 2004, 4:56 AM CST for 19 counties in Alabama. It was in force for 94 min.
The area
The outline as issued.
The facts
- Issued
- Dec 7, 2004, 4:56 AM CST (10:56 UTC)
- Expired
- Dec 7, 2004, 6:30 AM CST
- In force
- 94 min
- Issued by
- the Storm Prediction Center
Counties Bibb County, AL, Blount County, AL, Cullman County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jackson County, AL, Jefferson County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Perry County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL
The radar
The Birmingham radar (KBMX), 73 km from the middle of the area, began a volume at 10:57 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 nearest sounding before it
Birmingham, AL (KBMX), launched 00:00Z, 10.9 hours before the alert went out and 72 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
- 415 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 485 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 447 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
929 ACUS11 KWNS 071057 SWOMCD SPC MCD 071056 ALZ000-MSZ000-071230- MESOSCALE DISCUSSION 2513 NWS STORM PREDICTION CENTER NORMAN OK 0456 AM CST TUE DEC 07 2004 AREAS AFFECTED...CNTRL/NRN AL CONCERNING...TORNADO WATCH 915... VALID 071056Z - 071230Z THE TORNADO/DAMAGING WIND THREATS CONTINUE ACROSS NRN/CNTRL AL. LINE OF TSTMS CONTINUES TO CONTAIN EMBEDDED SUPERCELL STRUCTURES AS IT ADVANCES ACROSS NRN/CNTRL AL. A COUPLE OF CELLS HAVE ALSO EXHIBITED LOW LEVEL ROTATION...PARTICULARLY VCNTY A WARM FRONT /MID TO UPPER 60S DEW POINTS/ NW OF TUSCALOOSA. THE BIRMINGHAM VWP SHOWS STRONG LOW-MID LEVEL FLOW AND USING A STORM MOTION OF 230/45...0-1KM SRH REMAINS AOA 225 M2/S2. THUS...RISKS FOR TORNADOES WILL CONTINUE ACROSS PARTS OF NRN/CNTRL AL...WITH THE HIGHEST PROBABILITIES IN A CORRIDOR FROM TUSCALOOSA-JASPER- BIRMINGHAM. AIR MASS HAS DESTABILIZED FARTHER NORTH ACROSS NERN AL...BUT IT APPEARS THE TORNADO THREAT MAY DECREASE AS THE TSTMS MOVE EWD TOWARD HUNTSVILLE...GUNTERSVILLE...GADSDEN AND ANNISTON OWING TO SLIGHTLY LOWER BOUNDARY LAYER DEW POINTS. BUT...DAMAGING WINDS WILL CONTINUE TO BE A THREAT. ..RACY.. 12/07/2004 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...BMX...HUN...JAN... 32438865 34978723 34968570 32418721
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 7, 1:25 AM CST | Mesoscale Discussion | SPC | Bibb, Blount, Choctaw, Clarke, Cullman, Fayette and 14 more | 95 min |
| Dec 7, 3:25 AM CST | Tornado Watch | SPC | Bibb, Blount, Cullman, Fayette, Franklin, Greene and 17 more | 5 hr |
| Dec 7, 6:03 AM CST | Mesoscale Discussion | SPC | Baldwin, Clarke, Mobile, Monroe, Washington | 57 min |
| Dec 7, 6:58 AM CST | Mesoscale Discussion | SPC | Bibb, Blount, Cullman, Hale, Jackson, Jefferson and 3 more | 62 min |
Nearby
Mesoscale Discussions in Alabama, 2004Every mesoscale discussion in 2004
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.