Freeze Warning 2, NWS Huntsville, AL

050 
WWUS74 KHUN 010303
NPWHUN

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1003 PM CDT WED OCT 31 2012

...FREEZE WARNING IN EFFECT FROM 1 AM TO 8 AM CDT THURSDAY...

.COLD HIGH PRESSURE SITUATED WEST OF THE REGION...ALONG WITH
CLEAR SKIES AND LIGHT WINDS...WILL BE CONDUSIVE FOR AIR
TEMPERATURES FALLING TO OR BELOW FREEZING ACROSS MUCH OF THE
TENNESSEE VALLEY LATE TONIGHT AND EARLY THURSDAY MORNING.

ALZ001>010-016-TNZ076-096-097-011300-
/O.CON.KHUN.FZ.W.0002.121101T0600Z-121101T1300Z/
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN-
MARSHALL-JACKSON-DEKALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN-
INCLUDING THE CITIES OF...FLORENCE...MUSCLE SHOALS...
RUSSELLVILLE...MOULTON...ATHENS...HUNTSVILLE...DECATUR...
GUNTERSVILLE...SCOTTSBORO...FORT PAYNE...CULLMAN...LYNCHBURG...
FAYETTEVILLE...WINCHESTER
1003 PM CDT WED OCT 31 2012

...FREEZE WARNING REMAINS IN EFFECT UNTIL 8 AM CDT THURSDAY...

* TIMING AND AREAS AFFECTED...THE TENNESSEE VALLEY...INCLUDING 
  NORTHERN ALABAMA AND PORTIONS OF SOUTHERN MIDDLE TENNESSEE. 

* TEMPERATURE...LOW TEMPERATURES WILL RANGE FROM 30 TO 32 
  DEGREES IN MOST LOCATIONS FOR AROUND 3 HOURS. SOME SPOTS...
  SUCH AS WIND SHELTERED VALLEYS COULD EXPERIENCE EVEN COLDER 
  TEMPERATURES. ONLY LOCATIONS NEAR LARGE BODIES OF WATER...AND 
  SOME OF THE HIGHER ELEVATED TERRAIN SHOULD REMAIN ABOVE 
  FREEZING. 

* IMPACTS...SENSITIVE VEGETATION LEFT OUTDOORS WILL LIKELY BE 
  DAMAGED OR KILLED. 

PRECAUTIONARY/PREPAREDNESS ACTIONS... A FREEZE WARNING MEANS SUB-
FREEZING TEMPERATURES ARE IMMINENT OR HIGHLY LIKELY. THESE
CONDITIONS WILL KILL CROPS AND OTHER SENSITIVE VEGETATION.

&&

$$

504 
WWUS74 KHUN 011257
NPWHUN

URGENT - WEATHER MESSAGE
NATIONAL WEATHER SERVICE HUNTSVILLE AL
757 AM CDT THU NOV 1 2012

ALZ001>010-016-TNZ076-096-097-011400-
/O.EXP.KHUN.FZ.W.0002.000000T0000Z-121101T1300Z/
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN-
MARSHALL-JACKSON-DEKALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN-
INCLUDING THE CITIES OF...FLORENCE...MUSCLE SHOALS...
RUSSELLVILLE...MOULTON...ATHENS...HUNTSVILLE...DECATUR...
GUNTERSVILLE...SCOTTSBORO...FORT PAYNE...CULLMAN...LYNCHBURG...
FAYETTEVILLE...WINCHESTER
757 AM CDT THU NOV 1 2012

...FREEZE WARNING WILL EXPIRE AT 8 AM CDT THIS MORNING...

EARLY MORNING LOW TEMPERATURES NEAR OR BELOW FREEZING WILL BEGIN TO
CLIMB OVER THE NEXT FEW HOURS WITH THE ONSET OF THE DAYTIME HOURS.
THEREFORE...THE FREEZE WARNING WILL BE ALLOWED TO EXPIRE.

$$

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1200 PM CDT WED OCT 31 2012

.UPDATE...
FOR 18Z TAFS

&&

.DISCUSSION...
/ISSUED 1015 AM CDT WED OCT 31 2012/
STRONG AREA OF HIGH PRESSURE OUT OF THE MID/SRN PLAINS CONTINUES TO
MOVE SEWD INTO THE LOWER MS/TN VALLEY AREAS...AS AREA TEMPS CLIMB
NEAR/JUST ABOVE THE 50 DEGREE MARK. SOME MID/HIGH CLOUDS EMBEDDED
WITHIN A STRONG NW FLOW PATTERN ALSO CONTINUE TO STREAM ACROSS THE
MID SOUTH REGION...AND MAY AFFECT SOME OF THE WRN ZONES THROUGH THE
REMAINDER OF THE MORNING PERIOD. OTHERWISE...ANOTHER QUIET WX DAY IS
XPCTED FOR THE CNTRL TN VALLEY...WITH AFTERNOON HIGHS AGAIN CLIMBING
INTO THE UPPER 50S TO LOWER 60S RANGE. OTHER THAN TO REFRESH SOME OF
THE HOURLY GRIDS...NO MAJOR UPDATES ARE NEEDED ATTM.

09

&&

.AVIATION...
FOR 18Z TAFS...WITH A STRONG AREA OF HIGH PRESSURE OUT OF THE PLAINS
STATES BUILDING INTO THE REGION...VFR CONDITIONS ARE XPCTED THROUGH
THE TAF PERIOD. SFC WINDS OUT OF THE WNW AOA 10KT WILL ALSO DIMINISH
WITH THE ONSET OF THE EVENING PERIOD.

09

&&

.PREV DISCUSSION...
/ISSUED 422 AM CDT WED OCT 31 2012/
TWO MAIN AREAS OF LOW PRESSURE ARE CURRENTLY IMPACTING THE
CONUS...WITH THE REMNANTS OF SANDY CONTINUING TO TRACK ACROSS THE
NORTHEAST WHILE ANOTHER LOW IS TRACKING TOWARD THE PACIFIC NORTHWEST.
WEAK HIGH PRESSURE IS SPREAD ACROSS MUCH OF THE REST OF THE
COUNTRY...PROVIDING MOSTLY CLEAR SKIES AND FAIRLY COOL TEMPERATURES.
THE TN VALLEY HAS FINALLY SEEN WIND SPEEDS SLACKEN AS THE REMNANTS
OF SANDY ARE BEGINNING TO SHIFT TO THE N. A FEW LOBES OF VORTICITY
SPINNING AROUND THE FRINGES OF THIS STORM HAVE BEEN PRODUCING AREAS
OF CLOUD COVER...ONE OF WHICH MOVED ACROSS CENTRAL/SW PORTIONS OF THE
CWA TONIGHT AND HELPED KEEP TEMPERATURES FROM FALLING OFF AS RAPIDLY
AS IN THE EAST (CULLMAN AND MSL WERE STILL READING IN THE LOW 40S
WHILE FT PAYNE AND FAYETTEVILLE WERE SITTING AT 30 DEGREES AS OF
3AM). THOSE SITES WITH WARMER TEMPERATURES HAVE ALSO NOT FULLY
DECOUPLED OVERNIGHT...WITH LIGHT WNW WINDS OBSERVED AS OPPOSED TO
FULLY CALM CONDITIONS.

THE MAIN CONCERN FOR THE SHORT TERM FORECAST HAS BEEN OVERNIGHT
TEMPERATURES ACROSS THE CWA...AND THE CONCERN FOR A FREEZE. FTP AND
BGF HAVE ALREADY SEEN A COUPLE HOURS OF SUBFREEZING TEMPS TONIGHT.
WITHOUT A STRONG WARMING THIS AFTERNOON...THE FREEZE COULD BECOME
MORE WIDESPREAD TOMORROW. ATTM AM EXPECTING SOMETHING OF A REPEAT
OF TONIGHT WITH PATCHY AREAS OF HIGH CLOUDS MOVING ACROSS THE REGION
AROUND THE FRINGES OF THE NE LOW PRESSURE SYSTEM. THE TRANSIENT
CLOUDS AND LIGHT WINDS ARE EXPECTED TO PRIMARILY HELP NW AL FROM
HITTING FREEZING...WITH THE MAIN QUESTION BEING THE EASTWARD EXTENT
OF THE CLOUDS. WILL ALLOW THE DAY CREW TO FINE TUNE THE FREEZE
POTENTIAL FOR TONIGHT AND ISSUE A WARNING IF THEY DETERMINED THAT
THE CURRENT TRENDS FOR CLOUD COVER/WINDS WILL HOLD.

HEADING INTO THE EXTENDED...A RIDGE STILL LOOKS TO BUILD TOWARD THE
SOUTHEAST AND BRING A WARMING TREND THROUGH SATURDAY. HAVE SLIGHTLY
UPPED SAT TEMPS INTO THE MID 70S AS WE GET SOME NIGHT RETURN FLOW
AHEAD OF ANOTHER APPROACHING COLD FRONT. TIMING OF THIS FRONT REMAINS
THE MAIN QUESTION FOR THE EXTENDED FORECAST PERIOD...WHICH WOULD HAVE
A BIG IMPACT ON TEMPS FOR SUNDAY. HAVE GONE WITH A SLIGHTLY COOLER
FCST HIGH FOR SUNDAY SINCE WE ARE GETTING BETTER AGREEMENT AMONG
MODEL OUTPUT THAT FROPA SHOULD OCCUR DURING THE DAY SUNDAY. WITH
INCREASED CLOUD COVER AND LINGERING PRECIP ACROSS THE BACK EDGE OF
THE SLOW MOVING AND WEAK FRONT...AM ANTICIPATING THAT DIURNAL HEATING
WILL BE DAMPED. COOLER CONDITIONS SHOULD THEN FUNNEL INTO THE TN
VALLEY FOR THE FIRST HALF OF THE NEXT WORK WEEK. COLD ADVECTION
SHOULD BE WEAKER THAN SEEN THIS LAST WEEK...ALTHOUGH THE GFS IS
BRINGING A SHORTWAVE AROUND THE BACK EDGE OF THE MAIN DRIVING TROF
FOR THIS LOW/FRONTAL SYSTEM WHICH COULD MAKE THE MID LEVEL FLOW MORE
MERIDIONAL AS THE TROF AXIS PASSES US BY.

CCC

&&

.HUN WATCHES/WARNINGS/ADVISORIES...
AL...NONE.
TN...NONE.
&&

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE
AT WEATHER.GOV/HUNTSVILLE.

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1255 PM CDT WED OCT 31 2012

ALZ001>010-016-TNZ076-096-097-011000-
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN-
MARSHALL-JACKSON-DEKALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN-
1255 PM CDT WED OCT 31 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH ALABAMA AND PORTIONS
OF SOUTHERN MIDDLE TENNESSEE.

.DAY ONE...TONIGHT...

A WIDESPREAD FREEZE IS POSSIBLE LATE TONIGHT...WITH LOW TEMPERATURES
AROUND 30 TO 32 DEGREES FOR AT LEAST 2 TO 3 HOURS DURING THE EARLY
MORNING HOURS. SENSITIVE VEGETATION MAY NEED TO BE COVERED OR
BROUGHT INDOORS TONIGHT.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

AN APPROACHING COLD FRONT WILL BRING A SLIGHT CHANCE OF
THUNDERSTORMS TO THE AREA ON SUNDAY.

.SPOTTER CALL TO ACTION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL
IS NOT ANTICIPATED AT THIS TIME.