Alert archive / Alabama / Mesoscale Discussions in 2004

Mesoscale Discussion 96

February 6, 200415 counties in Alabama; Jefferson Parish, Saint Bernard Parish, Louisiana; 6 counties in Mississippi

The Storm Prediction Center issued this mesoscale discussion at Feb 6, 2004, 2:24 AM CST for 15 counties in Alabama; Jefferson Parish, Saint Bernard Parish, Louisiana; 6 counties in Mississippi. It was in force for 96 min.

The area

The outline as issued.

The facts

Issued: Feb 6, 2004, 2:24 AM CST (08:24 UTC)
Expired: Feb 6, 2004, 4:00 AM CST
In force: 96 min
Issued by: the Storm Prediction Center

All 23 counties

Autauga County, AL, Calhoun County, AL, Chilton County, AL, Clarke County, AL, Clay County, AL, Cleburne County, AL, Coosa County, AL, Dallas County, AL, Marengo County, AL, Monroe County, AL, Perry County, AL, Shelby County, AL, Talladega County, AL, Washington County, AL, Wilcox County, AL, Jefferson Parish, LA, Saint Bernard Parish, LA, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Stone County, MS

The radar

The Mobile radar (KMOB), 72 km from the middle of the area, began a volume at 08:26 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

Slidell Radar S, LA (KSIL), launched 00:00Z, 8.4 hours before the alert went out and 189 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1068 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 490 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 215 m²/s²
0-3 km storm-relative helicity: 224 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 5.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

994 
ACUS11 KWNS 060824
SWOMCD
SPC MCD 060824 
GAZ000-ALZ000-MSZ000-LAZ000-061000-

MESOSCALE DISCUSSION 0096
NWS STORM PREDICTION CENTER NORMAN OK
0224 AM CST FRI FEB 06 2004

AREAS AFFECTED...CNTRL AND SWRN AL...FAR SRN MS...FAR SERN LA

CONCERNING...TORNADO WATCH 8...

VALID 060824Z - 061000Z

CONVECTIVE LINE CURRENTLY EXTENDS FROM NERN AL SWD THROUGH SWRN
AL...SRN MS AND FAR SRN LA. THE LINE WILL CONTINUE MOVING SLOWLY EWD
AND WILL HAVE AN ISOLATED TORNADO THREAT AND WIND DAMAGE THREAT AS
IT EVENTUALLY MOVES INTO SERN AL AND WRN GA LATE TONIGHT.

THE CONVECTIVE LINE IS CURRENTLY DEVELOPING AHEAD OF A COLD FRONT
WITH A MOIST AXIS EXTENDING NWD ACROSS THE FL PANHANDLE INTO CNTRL
AL WHERE MID 60 F SFC DEWPOINTS EXIST. THIS IS RESULTING IN ENOUGH
INSTABILITY WHICH SHOULD KEEP THE LINE GOING FOR THE NEXT SEVERAL
HOURS. WATER VAPOR IMAGERY CURRENTLY SHOWS A SHORTWAVE TROUGH MOVING
NEWD ACROSS NRN AL. AS THIS WAVE MOVES AWAY FROM THE
LINE...LARGE-SCALE ASCENT WILL DECREASE WHICH MAY RESULT IN THE LINE
WEAKENING SOMEWHAT OVER THE NEXT FEW HOURS. HOWEVER...70 KT OF DEEP
LAYER SHEAR...0-1 KM OF SR HELICITY AND SUFFICIENT LOW-LEVEL
MOISTURE SHOULD KEEP THE LINE STRONG ENOUGH TO PRESENT AN ISOLATED
TORNADO THREAT OR WIND DAMAGE THREAT WITH BOW ECHOS EMBEDDED IN THE
LINE. IF THE LINE CAN REMAIN SUSTAINED AT CURRENT LEVELS...A NEW
WATCH MAY BECOME NECESSARY EAST OF THE CURRENT WATCH ACROSS SWRN GA
AND SERN AL.

..BROYLES.. 02/06/2004

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...FFC...BMX...MOB...LIX...

29269059 31188885 33088698 33848596 33778508 32118683
30148883 29248974

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 5, 7:03 PM CST	Mesoscale Discussion	SPC	Bibb, Chilton, Choctaw, Greene, Hale, Jefferson and 8 more	87 min
Feb 5, 10:01 PM CST	Mesoscale Discussion	SPC	Bibb, Chilton, Choctaw, Clarke, Dallas, Greene and 10 more	59 min
Feb 5, 10:55 PM CST	Tornado Watch	SPC	Autauga, Bibb, Calhoun, Chilton, Choctaw, Clarke and 14 more	5 hr
Feb 6, 7:32 AM CST	Mesoscale Discussion	SPC	Barbour, Bullock, Chambers, Coffee, Covington, Crenshaw and 8 more	118 min

Nearby

Mesoscale Discussions in Alabama, 2004 Mesoscale Discussions in Mississippi, 2004 Mesoscale Discussions in Louisiana, 2004 Every 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.