Alert archive / Alabama / Mesoscale Discussions in 2011

Mesoscale Discussion 3

January 1, 20114 states

The Storm Prediction Center issued this mesoscale discussion at Jan 1, 2011, 6:06 AM CST for 4 states. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Jan 1, 2011, 6:06 AM CST (12:06 UTC)
Expired: Jan 1, 2011, 8:00 AM CST
In force: 114 min
Issued by: the Storm Prediction Center

All 41 counties

Bibb County, AL, Calhoun County, AL, Cherokee County, AL, Chilton County, AL, Choctaw County, AL, Clarke County, AL, Dallas County, AL, Etowah County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Marengo County, AL, Perry County, AL, Shelby County, AL, St. Clair County, AL, Sumter County, AL, Talladega County, AL, Washington County, AL, Wilcox County, AL, Floyd County, GA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Washington Parish, LA, Clarke County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jasper County, MS, Jones County, MS, Lamar County, MS, Lauderdale County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Wayne County, MS

The radar

The Mobile radar (KMOB), 159 km from the middle of the area, began a volume at 12:10 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 12:00Z, 0.1 hours before the alert went out and 169 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 459 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 559 m²/s²
0-3 km storm-relative helicity: 694 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

815 
ACUS11 KWNS 011206
SWOMCD
SPC MCD 011206 
GAZ000-ALZ000-MSZ000-LAZ000-011400-

MESOSCALE DISCUSSION 0003
NWS STORM PREDICTION CENTER NORMAN OK
0606 AM CST SAT JAN 01 2011

AREAS AFFECTED...ERN LA/SERN MS/PARTS OF AL

CONCERNING...TORNADO WATCH 2...

VALID 011206Z - 011400Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 2 CONTINUES.

ISOLATED SEVERE/TORNADO POTENTIAL CONTINUES ACROSS WW 002.

LATEST SURFACE ANALYSIS SHOWS FRONT PROGRESSING EWD ACROSS NRN
AL...THOUGH MAKING MUCH SLOWER EWD PROGRESS ACROSS SRN MS AND LA. 
WIDESPREAD SHOWERS AND THUNDERSTORMS CONTINUE NEAR AND AHEAD OF THE
FRONT...WITH THE STRONGEST STORMS EXTENDING FROM W CENTRAL AND
CENTRAL AL SWWD INTO SERN MS.  WHILE CONVECTIVE INTENSITY HAS
DECREASED SLOWLY OVER THE PAST COUPLE OF HOURS AS STRONGER
LARGE-SCALE ASCENT SHIFTS BY TO THE NE...MOIST/MARGINALLY UNSTABLE
AIRMASS COUPLED WITH FAVORABLE KINEMATIC ENVIRONMENT SUGGESTS THAT
ISOLATED DAMAGING WINDS AND/OR AN ISOLATED TORNADO OR TWO WILL
CONTINUE OVER THE NEXT COUPLE OF HOURS.

..GOSS.. 01/01/2011

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

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

LAT...LON   30128905 29979111 32568890 33448705 34078632 34408485
            30128905

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 31, 10:46 PM CST	Tornado Watch	SPC	Fayette, Greene, Lamar, Marion, Pickens, Sumter and 3 more	5 hr
Jan 1, 1:14 AM CST	Mesoscale Discussion	SPC	Cullman, DeKalb, Jackson, Lawrence, Limestone, Madison and 2 more	61 min
Jan 1, 3:10 AM CST	Tornado Watch	SPC	Autauga, Baldwin, Bibb, Blount, Butler, Calhoun and 34 more	7 hr
Jan 1, 9:04 AM CST	Mesoscale Discussion	SPC	Baldwin, Butler, Clarke, Coffee, Conecuh, Covington and 9 more	56 min
Jan 1, 9:51 AM CST	Tornado Watch	SPC	Baldwin, Barbour, Bullock, Butler, Coffee, Conecuh and 10 more	4 hr
Jan 1, 12:32 PM CST	Mesoscale Discussion	SPC	Baldwin, Bullock, Butler, Coffee, Conecuh, Covington and 7 more	88 min

Nearby

Mesoscale Discussions in Alabama, 2011 Mesoscale Discussions in Mississippi, 2011 Mesoscale Discussions in Louisiana, 2011 Every mesoscale discussion in 2011

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.