

997 

WWUS20 KWNS 271659

SEL2

SPC WW 271659

ILZ000-MOZ000-280100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 962

NWS STORM PREDICTION CENTER NORMAN OK

1100 AM CST SAT DEC 27 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL ILLINOIS

       SOUTHERN INTO EASTERN MISSOURI



EFFECTIVE THIS SATURDAY MORNING AND EVENING FROM 1100 AM UNTIL

700 PM CST.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE

MILES EAST AND WEST OF A LINE FROM 20 MILES SOUTHWEST OF WEST

PLAINS MISSOURI TO 10 MILES NORTH NORTHEAST OF MARSEILLES

ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS.



OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 959. WATCH NUMBER 959 WILL NOT BE IN EFFECT AFTER

1100 AM CST. CONTINUE...WW 960...WW 961...



DISCUSSION...INTENSE...BROKEN SQUALL LINE WITH EMBEDDED

LEWP/SUPERCELLS AND THE POTENTIAL FOR ISOLATED/DISCRETE SUPERCELLS

AHEAD OF THE LINE WILL CONTINUE TO SPREAD ENEWD ACROSS WW THROUGH

THE LATE AFTERNOON/EARLY EVENING.  EXTREME LOW LEVEL SHEAR /50+ KT

JUST ABOVE THE SURFACE/ AND STRENGTHENING DEEP ASCENT/SURFACE

PRESSURE FALL MAXIMUM WILL ENHANCE THE RISK OF DAMAGING WINDS AND

POSSIBLE TORNADOES.  RISK MAY BE MITIGATED SOMEWHAT IN SRN PORTION

OF WW INTO THE EARLY AFTERNOON GIVEN PRECEDING SHALLOW MOIST

CONVECTION SPREADING ACROSS THE OZARKS.  HOWEVER...SUFFICIENT

RECOVERY WITH MODEST HEATING MAY STILL SUSTAIN A RISK AHEAD OF MAIN

SURFACE COLD FRONT THROUGH THE AFTERNOON ACROSS THIS REGION.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.

MEAN STORM MOTION VECTOR 23050.





...EVANS



997 

WWUS20 KWNS 271659

SEL2

SPC WW 271659

ILZ000-MOZ000-280100-



URGENT - IMMEDIATE BROADCAST REQUESTED

TORNADO WATCH NUMBER 962

NWS STORM PREDICTION CENTER NORMAN OK

1100 AM CST SAT DEC 27 2008



THE NWS STORM PREDICTION CENTER HAS ISSUED A

TORNADO WATCH FOR PORTIONS OF



       CENTRAL ILLINOIS

       SOUTHERN INTO EASTERN MISSOURI



EFFECTIVE THIS SATURDAY MORNING AND EVENING FROM 1100 AM UNTIL

700 PM CST.



TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS

TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.



THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 75 STATUTE

MILES EAST AND WEST OF A LINE FROM 20 MILES SOUTHWEST OF WEST

PLAINS MISSOURI TO 10 MILES NORTH NORTHEAST OF MARSEILLES

ILLINOIS.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE

ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU2).



REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR

TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH

AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR

THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS

AND POSSIBLE WARNINGS.



OTHER WATCH INFORMATION...THIS TORNADO WATCH REPLACES TORNADO

WATCH NUMBER 959. WATCH NUMBER 959 WILL NOT BE IN EFFECT AFTER

1100 AM CST. CONTINUE...WW 960...WW 961...



DISCUSSION...INTENSE...BROKEN SQUALL LINE WITH EMBEDDED

LEWP/SUPERCELLS AND THE POTENTIAL FOR ISOLATED/DISCRETE SUPERCELLS

AHEAD OF THE LINE WILL CONTINUE TO SPREAD ENEWD ACROSS WW THROUGH

THE LATE AFTERNOON/EARLY EVENING.  EXTREME LOW LEVEL SHEAR /50+ KT

JUST ABOVE THE SURFACE/ AND STRENGTHENING DEEP ASCENT/SURFACE

PRESSURE FALL MAXIMUM WILL ENHANCE THE RISK OF DAMAGING WINDS AND

POSSIBLE TORNADOES.  RISK MAY BE MITIGATED SOMEWHAT IN SRN PORTION

OF WW INTO THE EARLY AFTERNOON GIVEN PRECEDING SHALLOW MOIST

CONVECTION SPREADING ACROSS THE OZARKS.  HOWEVER...SUFFICIENT

RECOVERY WITH MODEST HEATING MAY STILL SUSTAIN A RISK AHEAD OF MAIN

SURFACE COLD FRONT THROUGH THE AFTERNOON ACROSS THIS REGION.



AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL

SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND

GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.

MEAN STORM MOTION VECTOR 23050.





...EVANS

