River Flood Advisory 11, NWS Indianapolis, IN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
1033 PM EST TUE DEC 11 2007

.UPDATE...

TWEAKED TEMPERATURES DUE TO TIGHT TEMPERATURE GRADIENT STILL ACROSS
THE FA. ALSO...TEMPS RUNNING A BIT COOLER THAN EXPECTED ACROSS PARTS
OF THE NWRN FA AS COOLER AIR ARRIVED QUICKLY. LOOKS LIKE LAF AREA
MAY STILL HIT FREEZING BY LATE TONIGHT...SO CURRENT FORECAST OF
CHANCE OF MIXED PRECIP LATE LOOKS GOOD. MOST OF PRECIP SHOULD BE SE
OF THERE BY THE TIME THE TEMP REACHES 32...SO NOT EXPECTING ANY
MAJOR PROBLEMS. OTHERWISE RAIN LOOKS TO CONTINUE ACROSS FA DURING
THE NIGHT WITH GOOD FRONTOGENTICAL FORCING CONTINUING.

&&

.AVIATION...

DISCUSSION FOR 00Z TAFS.

COLD FRONT HAS PASSED LAF AND HUF AND WILL CROSS IND AND BMG
BEFORE 03Z. WIND SHIFT EXPECTED AT IND AROUND 00-01Z FROM
SOUTHWEST TO NORTHWEST. CIGS SHOULD REMAIN IN THE IFR CATEGORY AND
OCCASIONALLY EVEN LIFR. RAIN WILL MOVE BACK INTO THE AREA AND SO
LOW VSBY AND CIGS WILL CONTINUE ALL NIGHT. A GRADUAL IMPROVEMENT
AFTER 15Z WITH A RETURN TO MVFR AT THAT TIME.

&&

.PREV DISCUSSION... /ISSUED 335 PM EST TUE DEC 11 2007/

SHORT TERM.../TNGT AND WEDNESDAY/
MAIN CHALLENGE TO THE SHORT TERM WL BE THE FOG EARLY ON AND THEN THE
RN TNGT. NATIONAL RADAR LOOP WAS SHOWING A MOSTLY SOLID AREA OF
PRECIP ALL THE WAY FM NCNTRL TX NE THROUGH OK...WRN MO AND INTO THE
GT LKS COINCIDENT WITH MOISTURE PLUME SEEN IN THE H20 VAPOR IMAGERY.
AREA WAS ALSO OCCURING NEAR AND APRCHG CD FNT AND AHEAD OF THE SW
UPR LOW THAT WAS FINALLY STARTING TO GET KICKED OUT. IMPULSES
EJECTING NE OF THE UPR LOW WERE HARD TO PICK OUT ON THE MODEL DATA.
BASED ON RADAR TRENDS AND THE GFS...BULK OF THE RN WL DROP SE ACRS
THE FA AFT 00Z AND EXIT THE SRN CWA BY NOON WED. EXPECT TEMPS TO
STAY JUST ABV FRZG IN THE NW TO KEEP PRECIP TYPE ALL RN. MODEL TIME
SECS FAVOR KEEPING LOW CLOUDS AROUND WHICH SHOULD LIMIT AFTERNOON
TEMPS TOMORROW TO NO WARMER THAN THE GFS. WITH WINDS PICKING UP AND
HEAVIER RN COMING IN TNGT...DONT THINK WELL NEED ISSUE A NEW FOG
ADVISORY AT THIS TIME.

LONG TERM.../WED NT THRU TUE/
MODELS IN GOOD AGREEMENT SO WL USE A BLEND. FOR TEMPS A BLEND
GUIDANCE BLEND WORKED WELL UNLESS OTHERWISE NOTED. FORECAST FOCUS IS
ON POPS/PRECIP TYPE WED NT AND THU.

WED NT...UPR TROF MVS UPSTREAM OF THE FA ON WED NT. FORCING IS
DECENT AS SFC LOW IS OVR KY AND UPR TROF HAS GOOD PVA WITH IT.
BROUGHT IN LIKELY POPS SW TAPERING OFF TO CHC IN THE NE THRU
6Z...THEN LIKELY EVERYWHERE 6-12Z. BEST FORCING/MOISTURE APPEARS TO
BE IN SRN FA. LOOKING AT SNDINGS DOES NOT SHOW A LOT OF POTENTIAL
FOR ICE...BUT DO SEE SNOW IN THE NW. SE SHUD STAY ALL RAIN WITH A
MIX IN THE CENTRAL. LOWS IN THE UPR 20S TO MID 30S.

THU...LIKELY POPS CONTINUE IN THE E FOR THE MORNING HOURS...AGAIN
WITH RAIN S AND SNOW N WITH A MIX IN BETWEEN. TOTAL SNOWFALL AMOUNTS
IN THE N LOOK TO BE AROUND 2 INCHES FOR STORM TOTAL WITH LESS S.
MODELS SHOW SYSTEM MVING OUT QUICKLY AND HAVE GONE WITH DRY FCST
AFTER 18Z. HIGHS IN THE MID 30S TO LOW 40S.

THU NT...DRY POPS AS HIGH PRES BLDS IN. MINS WL BE COLDER AS CLD CVR
HAS DECREASED. WENT WITH A BLEND IN THE MID 20S.

FOR THE EXTENDED...STUCK NR HPC GUIDANCE. ANOTHER SYSTEM APPROACHES
FRI NT. LOOKS LIKE THE MAIN SHOT OF PRECIP WL BE SAT. STILL QUITE A
BIT OF VARIABILITY IN THE MODELS ON THE TRACK OF THE LOW...BUT ANY
OF THE CURRENT OPTIONS STILL LOOKS LIKE LIKELY PRECIP IN THE SE WITH
CHC IN THE NW. TRACK DIFFERENCES MAKE A BIG DIFFERENCE IN TERMS OF
PRECIP TYPE. IN THE SE ECMWF LOOKS LIKE RAIN BY AFTERNOON AND MAYBE
SOME ICE BEFORE THEN...WHILE GFS LOOKS LIKE ALL SNOW. ELSEWHERE IN
THE FA LOOKS LIKE ALL SNOW IN BOTH. GIVEN THE UNCERTAINTY WL GO WITH
SNOW EVERYWHERE CHANGING OVER TO A RAIN/SNOW MIX IN THE SE ON SAT
AFTERNOON...BUT THIS WILL NEED TO MONITORED IN UPCOMING FCSTS. THE
BACK EDGE OF THE UPR TROF WL KEEP TEMPS COLD ON SUN AND SUN NT. THE
UPR TROF SWINGS COMPLETELY THRU BY MON AND AN UPR RDG MVS INTO THE
CENTRAL US BRINGING HIGH PRES IN AT THE SFC INTO TUE NT.

&&

.IND WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
1025 PM EST TUE DEC 11 2007

INZ043>049-051>057-060>065-067>072-130330-
VERMILLION-PARKE-PUTNAM-HENDRICKS-MARION-HANCOCK-HENRY-VIGO-CLAY-
OWEN-MORGAN-JOHNSON-SHELBY-RUSH-SULLIVAN-GREENE-MONROE-BROWN-
BARTHOLOMEW-DECATUR-KNOX-DAVIESS-MARTIN-LAWRENCE-JACKSON-JENNINGS-
1025 PM EST TUE DEC 11 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MUCH OF CENTRAL INDIANA.

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

ACCUMULATING SNOWFALL IS POSSIBLE ON FRIDAY NIGHT INTO SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

&&

MORE INFORMATION...ALONG WITH OTHER WEATHER...HYDROLOGICAL AND
CLIMATE INFORMATION CAN BE FOUND...AT HTTP://WEATHER.GOV/IND (ALL
LOWERCASE)

INZ021-028-029-031-035-130330-
CARROLL-WARREN-TIPPECANOE-HOWARD-FOUNTAIN-
1025 PM EST TUE DEC 11 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR FAR NORTHERN SECTIONS OF CENTRAL
INDIANA.

.DAY ONE...TONIGHT.

THERE IS A CHANCE FOR FREEZING RAIN AND SLEET LATE TONIGHT. WITH
TEMPERATURES FALLING TO AROUND FREEZING BY SUNRISE...SLICK SPOTS
MAY DEVELOP ON ROADS LATE.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

ACCUMULATING SNOWFALL IS POSSIBLE ON WEDNESDAY NIGHT INTO THURSDAY
AND AGAIN FRIDAY NIGHT INTO SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

&&

MORE INFORMATION...ALONG WITH OTHER WEATHER...HYDROLOGICAL AND
CLIMATE INFORMATION CAN BE FOUND...AT HTTP://WEATHER.GOV/IND (ALL
LOWERCASE)

INZ030-036>042-130330-
CLINTON-MONTGOMERY-BOONE-TIPTON-HAMILTON-MADISON-DELAWARE-
RANDOLPH-
1025 PM EST TUE DEC 11 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN CENTRAL
INDIANA.

.DAY ONE...TONIGHT.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.

ACCUMULATING SNOWFALL IS POSSIBLE ON WEDNESDAY NIGHT INTO THURSDAY
AND AGAIN FRIDAY NIGHT INTO SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED.

&&

MORE INFORMATION...ALONG WITH OTHER WEATHER...HYDROLOGICAL AND
CLIMATE INFORMATION CAN BE FOUND...AT HTTP://WEATHER.GOV/IND (ALL
LOWERCASE)