Alert archive / Georgia / Mesoscale Discussions in 2011

Mesoscale Discussion 80

February 1, 2011Houston County, Alabama; 16 counties in Florida; 29 counties in Georgia

The Storm Prediction Center issued this mesoscale discussion at Feb 1, 2011, 10:47 PM CST for Houston County, Alabama; 16 counties in Florida; 29 counties in Georgia. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued: Feb 1, 2011, 10:47 PM CST (04:47 UTC)
Expired: Feb 2, 2011, 12:15 AM CST
In force: 88 min
Issued by: the Storm Prediction Center

All 46 counties

Houston County, AL, Bay County, FL, Calhoun County, FL, Franklin County, FL, Gadsden County, FL, Gulf County, FL, Hamilton County, FL, Jackson County, FL, Jefferson County, FL, Lafayette County, FL, Leon County, FL, Liberty County, FL, Madison County, FL, Suwannee County, FL, Taylor County, FL, Wakulla County, FL, Washington County, FL, Baker County, GA, Ben Hill County, GA, Berrien County, GA, Brooks County, GA, Calhoun County, GA, Clay County, GA, Colquitt County, GA, Cook County, GA, Crisp County, GA, Decatur County, GA, Dooly County, GA, Dougherty County, GA, Early County, GA, Echols County, GA, Grady County, GA, Irwin County, GA, Lanier County, GA, Lee County, GA, Lowndes County, GA, Miller County, GA, Mitchell County, GA, Randolph County, GA, Seminole County, GA, Terrell County, GA, Thomas County, GA, Tift County, GA, Turner County, GA, Wilcox County, GA, Worth County, GA

The radar

The Tallahassee radar (KTLH), 49 km from the middle of the area, began a volume at 04:48 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

Tallahassee Rgnl, FL (KTLH), launched 00:00Z, 4.8 hours before the alert went out and 51 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: 64 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 453 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: 326 m²/s²
0-3 km storm-relative helicity: 355 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

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

680 
ACUS11 KWNS 020448
SWOMCD
SPC MCD 020447
GAZ000-FLZ000-ALZ000-020615-

MESOSCALE DISCUSSION 0080
NWS STORM PREDICTION CENTER NORMAN OK
1047 PM CST TUE FEB 01 2011

AREAS AFFECTED...PORTIONS EXTREME SERN AL...SWRN/S-CENTRAL GA...FL
PANHANDLE...EXTREME NWRN FL.

CONCERNING...TORNADO WATCH 11...

VALID 020447Z - 020615Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 11 CONTINUES.

REMAINDER WW MAY BE ALLOWED TO EXPIRE AS SCHEDULED AT 05Z.

SFC MESOANALYSIS SHOWS WARM FRONT ABOUT 40 NM OFFSHORE SC COAST SWWD
ACROSS OKEFENOKEE SWAMP...THEN NWWD BETWEEN VLD-AMG AND JUST N
ABY...BECOMING DIFFUSE UNDER PRECIP SHIELD THAT DENOTES REMNANTS OF
NRN PORTION OF CONVECTIVE PLUME.  MODIFIED RUC SOUNDINGS SUGGEST
POCKETS OF RELATIVELY MINIMIZED MLCINH  -- I.E. AROUND 50 J/KG --
ARE POSSIBLE OVER SRN GA SURROUNDED BY MUCH STRONGER CINH N OF WARM
FRONT AND ASSOCIATED WITH NERN GULF MARINE LAYER.  VERTICAL SHEAR
WILL REMAIN FAVORABLE ACROSS THIS REGION...HOWEVER BUOYANCY
CONTINUES TO BECOME MORE LIMITED SPATIALLY AND IN MAGNITUDE...WITH
MLCAPE AROUND 250 J/KG IN NARROW CORRIDOR AHEAD OF LINE IN CENTRAL
PANHANDLE OF FL....AND DIMINISHING NWD.  WHILE SVR THREAT -- IN FORM
OF ISOLATED DAMAGING GUST OR TORNADO -- IS NON-ZERO OVER REMAINDER
WW AREA AND EWD ACROSS PORTIONS SRN GA S OF WARM FRONT...POTENTIAL
CONTINUES TO DECREASE GRADUALLY AS SRN PORTION OF PRIMARY SQUALL
LINE MOVES INTO PROGRESSIVELY HIGHER-MLCINH BOUNDARY-LAYER AIR MASS.

..EDWARDS.. 02/02/2011

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

ATTN...WFO...JAX...FFC...TAE...

LAT...LON   30378609 31008557 31428531 31838470 32218366 31878309
            30538266 29658342 30088400 29588498 29688516 29648538
            29918546 30058558 30248590 30378609

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 1, 6:19 PM CST	Tornado Watch	SPC	Coffee, Covington, Dale, Geneva, Henry, Houston	5 hr
Feb 1, 7:50 PM CST	Mesoscale Discussion	SPC	Barbour, Dale, Geneva, Henry, Houston, Lee and 1 more	115 min

Nearby

Mesoscale Discussions in Georgia, 2011 Mesoscale Discussions in Florida, 2011 Mesoscale Discussions in Alabama, 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.