Tornado Warning 134, NWS Birmingham, AL

000 
WWUS54 KBMX 181818
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
118 PM CDT THU OCT 18 2007

ALC075-181845-
/O.CON.KBMX.TO.W.0134.000000T0000Z-071018T1845Z/
LAMAR AL-
118 PM CDT THU OCT 18 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 145 PM CDT FOR NORTHERN
LAMAR COUNTY...

AT 117 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A TORNADO.  THIS TORNADO WAS LOCATED NEAR SULLIGENT...OR
ABOUT 9 MILES SOUTH OF DETROIT...MOVING NORTHEAST AT 35 MPH.

THE TORNADO WILL BE NEAR...
  8 MILES SOUTHEAST OF DETROIT BY 125 PM CDT...
  BEAVERTON AND HENSON SPRINGS BY 130 PM CDT...

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

LAT...LON 3404 8820 3406 8804 3403 8797 3402 8796
      3389 8800 3382 8809 3385 8821
TIME...MOT...LOC 1818Z 228DEG 32KT 3390 8813

$$

KSL

000 
WWUS54 KBMX 181828
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
128 PM CDT THU OCT 18 2007

ALC075-181845-
/O.CON.KBMX.TO.W.0134.000000T0000Z-071018T1845Z/
LAMAR AL-
128 PM CDT THU OCT 18 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 145 PM CDT FOR NORTHERN
LAMAR COUNTY...

AT 125 PM CDT...A TORNADO WAS REPORTED.  THIS TORNADO WAS LOCATED
NEAR BEAVERTON...OR ABOUT 9 MILES SOUTHEAST OF DETROIT...MOVING
NORTHEAST AT 35 MPH.

THE TORNADO WILL BE NEAR...
  RURAL NORTHEASTERN LAMAR COUNTY AT 140 PM CDT

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

LAT...LON 3404 8814 3406 8804 3403 8797 3402 8796
      3397 8798 3390 8800 3385 8807 3386 8817
TIME...MOT...LOC 1828Z 228DEG 32KT 3396 8803

$$
KSL

000 
WWUS54 KBMX 181835
SVSBMX

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
135 PM CDT THU OCT 18 2007

ALC075-181845-
/O.CON.KBMX.TO.W.0134.000000T0000Z-071018T1845Z/
LAMAR AL-
135 PM CDT THU OCT 18 2007

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 145 PM CDT FOR
NORTHEASTERN LAMAR COUNTY...

AT 130 PM CDT...A TORNADO WAS REPORTED.  THIS TORNADO WAS LOCATED
NEAR BEAVERTON...OR ABOUT 10 MILES SOUTHEAST OF DETROIT...MOVING
NORTHEAST AT 35 MPH.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT. GET UNDER A
WORKBENCH OR OTHER PIECE OF STURDY FURNITURE. IF NO BASEMENT IS
AVAILABLE...SEEK SHELTER ON THE LOWEST FLOOR OF THE BUILDING IN AN
INTERIOR HALLWAY OR ROOM SUCH AS A CLOSET. USE BLANKETS OR PILLOWS TO
COVER YOUR BODY AND ALWAYS STAY AWAY FROM WINDOWS.

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
SUBSTANTIAL SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE
NEAREST DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 1100 PM CDT THURSDAY EVENING
FOR NORTHWESTERN ALABAMA.

LAT...LON 3404 8814 3406 8804 3402 8796 3394 8799
      3391 8799 3387 8807 3389 8816
TIME...MOT...LOC 1835Z 228DEG 32KT 3400 8797

$$

KSL

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1230 PM CDT THU OCT 18 2007

.UPDATE...AVIATION DISCUSSION

LOOKING UPSTREAM TEMPERATURES ARE NOW NEAR 80 DEGREES IN CENTRAL
MISSISSIPPI AND WE ARE STARTING TO SEE THE FIRST LIGHTNING STRIKES.
DRIER AIR WORKING IN ACROSS THE AREA IS LEADING TO LESS CLOUD COVER
ACROSS WESTERN ALABAMA.  THIS TREND WILL SHIFT EASTWARD AND ALLOW
TEMPERATURES TO APPROACH 80 DEGREES BY MIDDAY.  FEEL LIKE TRENDS IN
CENTRAL MISSISSIPPI WILL BE A GOOD INDICATION OF WHAT WEST CENTRAL
ALABAMA WILL EXPERIENCE A COUPLE OF HOURS LATER.  AFTERNOON
INSTABILITY WHERE THE MORE SIGNIFICANT WARMING OCCURS WILL TOP OUT
AROUND -4 LI AND CAPE IN THE 1000 TO 1300 RANGE.  ALSO WITH 0-3 KM
SRH NEAR 200 M/S STILL A BIT CONCERNED THAT ANY STORMS THAT DO
DEVELOP COULD BEGIN TO ROTATE.  SEVERE THREAT SHOULD BE A BIT LESS
IN EASTERN ALABAMA WHERE INSTABILITY WILL BE LIMITED BY CLOUD
COVER.    OVERNIGHT...ANY SEVERE STORMS SHOULD BE LARGELY CONFINED
TO NEAR OR ALONG THE FRONT.  MORE TO COME ON THE OVERNIGHT FORECAST.

12/SIRMON

&&

.DISCUSSION...

PREVIOUS DISCUSSION

ACTIVE 24 HOURS OF WEATHER AHEAD OF US...WITH MAIN CONCERN BEING
POTENTIAL FOR STRONG TO SEVERE WEATHER.

MODELS IN GOOD AGREEMENT WITH MAIN FEATURES...BUT OF COURSE THE
DEVIL IS IN THE DETAILS. STRONG...MOIST...SOUTHERLY FLOW OUT AHEAD
OF THE APPROACHING COLD FRONT WILL HELP PROVIDE AN ABUNDANT SUPPLY
OF POTENTIALLY UNSTABLE AIR.  A SERIES OF WEAK UPPER LEVEL
DISTURBANCES WELL OUT AHEAD OF THE FRONT WILL BRING WHAT LOOKS TO BE
AT LEAST 2 EPISODES OF SHOWERS/THUNDERSTORMS AHEAD OF THE FRONT. THE
FIRST WAVE IS CURRENTLY IN SOUTHWESTERN ALABAMA MOVING NORTHEASTWARD
AT ABOUT 30 MPH...AND SHOULD AFFECT SOUTHERN PORTIONS OF THE
FORECAST AREA...MGM/SEM/TOI...DURING THE MORNING COMMUTE HOURS.
THESE STORMS HAVE SHOWN SOME ROTATION...AND WHILE HEAVY RAIN LOOKS
TO BE THE MAIN CONCERN...THERE IS THE OUTSIDE SHOT OF A TORNADO
POSSIBLY IF ANY OF THE CELLS CAN DEVELOP DEEP SUSTAINED CONVECTION.
THIS WAVE WILL CONTINUE TO TRACK ACROSS PORTIONS EAST CENTRAL
ALABAMA...MAINLY EAST OF I-65 AND SOUTH OF I-20. LATER THIS MORNING
AND INTO THE AFTERNOON...WITH A JUICY WEDGE OF HIGH THETA-E AIR
ACROSS THE AREA...THE COMBINATION OF HEATING OF THE DAY DECENT SHEAR
SHOULD RESULT IN THUNDERSTORM DEVELOPMENT...AND THE CONCERNS OF
ISOLATED TORNADOES.

TONIGHT...TWO AREAS TO FOCUS ON...AS WAVE 2 RACES NORTHEASTWARD
ACROSS THE SOUTHEASTERN THIRD OR SO OF THE FORECAST AREA...AND THE
FRONT APPROACHES FROM THE WEST.  WITH THE LOSS OF DAYTIME HEATING...
BELIEVE THE THREAT FOR SEVERE WEATHER IN THE SOUTHEAST WILL DIMINISH
A BIT...ALTHOUGH STORMS WILL STILL TEND TO ROTATE. AS THE FRONT
APPROACHES NORTHWESTERN ALABAMA LATE TONIGHT...SEVERAL SEVERE
WEATHER INGREDIENTS/PARAMETERS WILL COME TOGETHER AHEAD OF THE
FRONT...WITH AMPLE INSTABILITY...GOOD LOW LEVEL JET AND RIGHT REAR
QUADRANT OF THE UPPER LEVEL JET.  WHILE DIRECTIONAL SHEAR IS A BIT
LACKING...STILL ENOUGH SPEED SHEAR TO SUPPORT SUPERCELLS AND
ISOLATED TORNADOES. THAT SAID...SOME CONCERN THAT BEST DYNAMICS ARE
HEADED NORTH...WHICH WILL HAVE TO BE KEPT IN MIND AS THE DAY
DEVELOPS.

TEMPS AND POPS...IT WILL BE WARM AND MUGGY WITH RAIN JUST ABOUT
EVERYWHERE BY TOMORROW MORNING. STAYED CLOSE TO GUIDANCE ON
TEMPS...AT OR ABOVE GUIDANCE ON POPS.

JD/81

ON FRIDAY...GIVEN CURRENT COLD FRONTAL PASSAGE TIMING BY MODELS...
WOULD EXPECT TO HAVE A BIT OF LEFTOVER SHOWERS/STORMS IN THE EAST
AND SOUTH EARLY ON.  ALL RAIN SHOULD EXIT THE FORECAST AREA BY
FRIDAY AFTERNOON...LEAVING DRY CONDITIONS FOR THE REMAINDER OF THE
WEEKEND.

FROM MONDAY THROUGH THE REMAINDER OF NEXT WEEK...FORECAST CONFIDENCE
REMAINS JUST ABOUT AS LOW AS IT CAN GET. 00Z OPERATIONAL GFS
MAINTAINS A FAIRLY PROGRESSIVE LARGE AMPLITUDE TROUGH THAT SWEEPS
THROUGH HERE IN THE MONDAY/TUESDAY TIME FRAME. THE ECMWF INSISTS
THAT A CUTOFF LOW WILL FORM SOMEWHERE IN THE VICINITY OF NEW
MEXICO...AND REMAIN THERE UNTIL IT IS KICKED OUT BY THE NEXT WEST
COAST SHORTWAVE THE END OF NEXT WEEK. THE GEM AND THE NOGAPS LEND
THEIR SUPPORT TO THE WESTERN CUTOFF LOW SOLUTION...AS DO AT LEAST
TWO 00Z GFS ENSEMBLE MEMBERS. SENSIBLE WEATHER IMPACTS ARE HUGE...AS
THE GFS SHOWS HIGHS AROUND 70 DEGREES ON TUESDAY...WHILE THE PATTERN
THE ECMWF DEPICTS SUGGESTS TEMPS AROUND 90 DEGREES NOT TO MENTION
THE DIFFERENCE IN RAIN CHANCES BETWEEN THE TWO SOLUTIONS.

WHAT TO DO...WHAT TO DO?  MY GUT TELLS ME THAT THE CUTOFF SOLUTION
IS THE ONE MORE LIKELY TO HAPPEN...AND IS ONE I HAVE SEEN HAPPEN
MORE OFTEN IN THE PAST.  BUT THE OPERATIONAL GFS CANT BE COMPLETELY
DISCOUNTED EITHER...AS IT SHOWS WHAT WOULD BE ANOTHER SIGNIFICANT
RAIN EVENT FOR THE AREA. ULTIMATELY...I TRENDED THE FORECAST TOWARD
THE CUTOFF SOLUTION...GOING WITH CHANCE POPS (A COMPROMISE BETWEEN
THE LIKELY POPS OF THE GFS AND THE NIL POPS OF THE ECMWF). FOR
HIGHS...I ENDED UP WITH A BLEND OF THE GFS ENSEMBLE MEAN AND THE
HIGHEST ENSEMBLE MEMBER (WHICH BASICALLY SPLIT THE DIFFERENCE
BETWEEN THE TWO PREVIOUSLY MENTIONED EXTREME POSSIBILITIES).

GENERAL FORECAST UNCERTAINTY CARRIES OVER INTO THE MORE SPECIFIC
CONCERN OF SEVERE WEATHER ON MONDAY. OBVIOUSLY...THE SEVERE WEATHER
THREAT HINGES ENTIRELY ON THE EVENTUAL EVOLUTION OF THIS SYSTEM. THE
ECMWF (AND ITS SUPPORTERS) WOULD BASICALLY FAVOR A NON-EVENT. EVEN
THE CURRENT OPERATIONAL GFS SUGGESTS A RATHER MINIMAL SEVERE WEATHER
THREAT...WITH VERY LIMITED INSTABILITIES AND NOT OVERLY IMPRESSIVE
KINEMATIC FIELDS.  HOWEVER...THERE IS STILL THE CHANCE (OR
LIKELIHOOD?) THAT THE VERIFYING SOLUTION WILL BE SOMEWHERE IN
BETWEEN...OR SOMETHING COMPLETELY DIFFERENT. SO WHILE THE THREAT
OF A SEVERE WEATHER EPISODE IS RATHER LOW BASED ON CURRENT MODEL
OUTPUT...IT IS NON-ZERO. MEANING...LATER MODEL RUNS STILL NEED TO
BE WATCHED CLOSELY.

/61/

&&

.AVIATION...18Z DISCUSSION.

RATHER CHAOTIC CONDITIONS EXPECTED AT ALL TAF SITES NEXT 24 HRS.
EXPECT SHRA/TSTMS TO AFFECT MGM/TOI/ANB THIS MORNING...WITH OCNL
TSTMS DEVLPG IN HEAT OF THE DAY THIS AFTN. OUTSIDE OF SHRA/TSTMS...
EXPECT MVFR CIGS AT THE WORST. FOR TCL/BHM/EET...EXPECT SCT
SHRA/TSTMS THROUGH THE DAY. TNGT...EXPCT LN OF TSTMS ALONG AND OUT
AHEAD OF APCHG COLD FNT...BEGINNING TO AFFECT TCL AT ABOUT 03Z...
BHM/EET AT 05Z...ANB AT 06Z...AND MGM/TOI 10Z. SHRA/TSTMS SHOULD
LINGER THRU MOST OF THE REMNDR OF THE NGT. LCLY HVY RNFL...GUSTY
WINDS... SGNFCNTLY REDUCED CIGS/VIS PSBL WITH THIS LINE OF STRMS...
OTHRWS EXPECT MVFR CIGS.  ABRUPT CLEARING AND CHANGE IN WIND
DIRECTION CAN BE EXPECTED WITH THE PASSAGE OF THE FRONT.  WINDS WILL
SHIFT NORTHWESTERLY AT AROUND 8 TO 10 KNOTS.  CB UTILIZED AT MGM TO
SIGNIFY DEVELOPING THUNDERSTORMS IN THE REGION.

12/SIRMON

&&

.BMX WATCHES/WARNINGS/ADVISORIES...
AL...LAKE WIND ADVISORY NORTH HALF FROM 10AM TO 7 PM TODAY.

&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BIRMINGHAM AL
101 PM CDT THU OCT 18 2007

ALZ011>015-017>050-191802-
AUTAUGA-BARBOUR-BIBB-BLOUNT-BULLOCK-CALHOUN-CHAMBERS-CHEROKEE-
CHILTON-CLAY-CLEBURNE-COOSA-DALLAS-ELMORE-ETOWAH-FAYETTE-GREENE-HALE-
JEFFERSON-LAMAR-LEE-LOWNDES-MACON-MARENGO-MARION-MONTGOMERY-PERRY-
PICKENS-PIKE-RANDOLPH-RUSSELL-SHELBY-ST CLAIR-SUMTER-TALLADEGA-
TALLAPOOSA-TUSCALOOSA-WALKER-WINSTON-
101 PM CDT THU OCT 18 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE COUNTIES SERVED BY
THE NATIONAL WEATHER SERVICE OFFICE IN BIRMINGHAM.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS...WITH ISOLATED
TORNADOES POSSIBLE...ACROSS CENTRAL ALABAMA THIS AFTERNOON AND
TONIGHT.

THE PRIMARY THREAT FROM 1 PM THROUGH 8 PM WILL MAINLY BE AREAS
ALONG AND WEST OF INTERSTATE 65 IN THE VICINITY OF THE BEST
INSTABILITY.  AS WE MOVE THROUGH THE PEAK HEATING HOURS OF THE
AFTERNOON...SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP. THIS
INCREASED HEATING WILL RESULT IN THE POTENTIAL FOR SUPERCELL
THUNDERSTORMS...WITH ISOLATED TORNADOES AND LOCALLY HEAVY RAINFALL
POSSIBLE.

THE THUNDERSTORM ACTIVITY WILL LIKELY DIMINISH FROM 8 PM TO
MIDNIGHT..THEN INCREASE AFTER MIDNIGHT AS A COLD FRONT MOVES INTO
THE WESTERN SECTIONS.  THERE WILL BE A SLIGHT RISK OF SEVERE
THUNDERSTORMS...WITH THE POTENTIAL OF ISOLATED TORNADOES ACROSS THE
ENTIRE AREA AFTER MIDNIGHT ALONG AND NEAR THIS COLD FRONT AS IT MOVES
FROM WEST TO EAST ACROSS THE AREA.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY.

A FEW LINGERING STRONG STORMS ARE ALSO POSSIBLE FRIDAY MORNING
AS THE COLD FRONT EXITS SOUTHEASTERN PORTIONS OF THE STATE...MOST
LIKELY SOUTHEAST OF INTERSTATE 85 BEFORE 10 AM.  LOCALIZED HEAVY
RAINFALL AND GUSTY WINDS WILL BE THE MAIN THREATS.

STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE ALONG AND AHEAD OF
ANOTHER COLD FRONT NEXT MONDAY. THERE IS A GREAT DEAL OF UNCERTAINTY
WITH THE FORECAST OF THIS SYSTEM...AND ADJUSTMENTS TO TIMING AND
MAGNITUDE OF THIS THREAT ARE LIKELY.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL
MAY BE NEEDED THIS AFTERNOON AND TONIGHT...AND PERHAPS NEXT
MONDAY.

KSL

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BIRMINGHAM AL
1243 PM CDT THU OCT 18 2007

ALZ012-181830-
LAMAR-
1243 PM CDT THU OCT 18 2007

...SIGNIFICANT WEATHER ALERT FOR LAMAR COUNTY UNTIL 130 PM CDT...

AT 1238 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM NEAR LAMAR COUNTY AIRPORT...OR 6 MILES NORTH OF
VERNON...MOVING NORTHEAST AT 25 MPH.

WINDS UP TO 35 MPH AND FREQUENT CLOUD TO GROUND LIGHTNING ARE
EXPECTED WITH THIS STORM.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL
TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS
CONCERNING THIS WEATHER SITUATION.

KSL