River Flood Warning 54, NWS Indianapolis, IN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
707 PM EDT THU APR 2 2009

.AVIATION...FOR 06Z TAFS

SFC LOW ACRS NCNTRL AR WL LIFT NE ALONG THE OH RVR VLY OVERNGT.
MEANWHILE...BROAD AREA OF HEAVY RAIN/TRWS IN ASSOCIATION WITH A
SCOUT WAVE AHEAD OF ERN OK/TX TROF HAS MOVED OVER HUF AND BMG .
LOOKING AT REGIONAL RADAR...THIS ACTIVITY SHOULD MAKE IT TO IND AND
LAF AROUND 01Z. ACTIVITY SHOULD LAST 3 HOURS OR MORE SOLID BASED ON
TRACKING. UPSTREAM OBS HAVE SHOWN IFR VBSYS AND MVFR CIGS IN TRWS
WHICH SHOULD CONT ACRS OUR TERMINALS. BASED ON INSTABILITY
PROGS...AND LIGHTNING STRIKE TRENDS...WL GO AHEAD WITH TRWS IN THE
MAIN GROUP UNTIL LATE EVE/EARLY OVERNGT WHEN INSTABILITY IS EXPECTED
TO WANE. RADAR TRENDS DONT SUPPORT MORE THAN VCSH AFTER THE INITIAL
AREA OF STORMS MOVES ACRS. HOWEVER...MODEL TIME SECS FAVOR IFR CIGS
OVERNGT THROUGH MID MRNG. THEN...CIGS TO LIFT AND SCATTER DURING THE
AFTERNOON. VERY STG SFC PRES GRADIENT AFT 12Z 03 APR AND SHOULD BE
AFTERNOON SS...SO NW WINDS ABV 20 KTS AND GUSTS TO 35 KTS PSBL.

&&

.PREV DISCUSSION...STRONG LOW RES WAS FOUND OVR WRN ARKANSAS EARLY
THIS AFTERNOON AND A WARM FRONT EXTENDED NORTHWARD ACRS MO TO
CENTRAL IL AN NW INDIANA. SE SFC FLOW WAS IN PLACE ACRS INDIANA AND
DEW POINTS WERE IN THE MIDDLE 30S. RADAR MOSAICS SHOW A LARGE AREA
OF SHOWERS AND EMBEDDED TSRA OVR NE ARKANSAS SLIDING NE.

MAIN FORECAST CHALLENGE TDY WL BE POPS.

MODELS ARE IN PRETTY GOOD AGREEMENT...WL USE A BLEND.

THE STRONG LOW PRES SYS IS EXPECTED TO PUSH TOWARD AND ALONG THE
OHIO RVR TONIGHT. 300K GFS ISENTROPIC SFC SHOW GOOD LIFT AFT 00Z
TONIGHT ALONG WITH SPECIFIC HUMIDITIES INCREASING TO 5 G/KG BY 06Z.
FORECAST SOUNDINGS ALSO SHOW A VERY MOIST COLUMN WITH PWATS OVER 1
INCH. TIME HEIGHT SECTIONS ALSO PLENTY OF MOISTURE ALONG WITH STRONG
VV. HENCE WITH ALL THIS GOOD FORCING WL USE 100 POPS...AGREEING
WITH THE MAVMOS. INSTABILITY SEEMS RATHER LIMITED AT THIS
POINT...ESPECIALLY WITH DEWPOINTS IN THE 30S. EXPECT DEW POINT TEMPS
TO SURGE AS MORE MOIST AIR GET PULLED NORTH RIGHT AHEAD OF THE LOW.
STILL WITH CAPES LESS ONLY REACHING THE 200-500 RANGE ACRS THE FA
AND CONVECTION MUCH FARTHER SOUTH ROBBING MOISTURE...WIDESPREAD
THUNDER IS APPEARING LESS LIKELY. WL KEEP A MENTION FOR SOME RUMBLES
THOUGH. GIVEN THE EXPECTED RAINFALL WL LOOK TOWARD WETBULBS FOR
LOWS.

WRAP AROUND MOISTURE LOOKS TO LINGER ON FRIDAY MORNING. A FEW SCT
SHRA CANNOT BE RULED OUT...PARTICULARLY ACRS THE EAST. MID LEVELS
DRY OUT CONSIDERABLY AFT 18Z...SIGNALING THE END OF THE PCPN AS THE
UPPER RIDGE BUILDS FROM THE WEST. EXPECT CLOUDS TO DECREASE ON FRI
AS THE DAY PROGRESSES AS THE LOW DEPARTS AND THE RIDGE ARRIVES. AS
H8 TEMPS FALL TO AROUND 0C BY 00Z SAT WL LEAN 1-2 DEGREES COOLER
THAN THE MAVMOS ON FRI HIGHS.

RIDGE OF HIGH PRES SETTLES OVR INDIANA ON FRI NIGHT AND SAT. WITH A
DRY COLUMN AND SUBSIDENCE EXPECT MOCLR SKIES. WL LEAN A LITTLE
COOLER ON LOWS AND BUT STICK CLOSE ON HIGHS AS MAVMOS SEEMS TO
HANDLE THAT PRETTY WELL.

EXPECT CLOUDS TO INCREASE ON SAT NIGHT AHEAD OF THE APPROACHING LOW
ON SUNDAY AND WL USE AN INCREASING CLOUDINESS TREND ALONG WITH LOW
TEMPS WARMER THAN MAVMOS.

AS FOR THE EXTENDED...ANOTHER COUPLE OF LOW PRESSURE SYSTEMS WILL
PUSH ACRS THE RGN ALONG WITH A RIDGE IN BETWEEN. THE FIRST SYSTEM
WILL PUSH ACRS ON SUNDAY...SPREADING SHRA AND TSRA ACRS CENTRAL
INDIANA. IN THE WAKE OF THIS LOW BROAD LOW PRES WL REMAIN ACRS THE
RGN WITH A COLD NRNLY AND CYCLONIC FLOW ACRS INDIANA. THUS SHUD
ALLOW FOR PLENTY OF CLOUDS ON MONDAY ALONG WITH CONVECTIVE SHRA OR
SHSN. ACCUMULATIONS WL BE QUITE MINIMAL...BUT CLOUDS AND COLD WL
KEEP TEMPS BELOW NORMAL AND HAVE CUT MEXMOS TEMPS.

UPPER RIDGE BUILDS IN FOR TUESDAY AND WEDNESDAY AND A MODERATING
TURN IN TEMPERATURES ARE EXPECTED. ANOTHER LOW APPROACHES ON
THURSDAY...BUT WILL HOLD OFF ON POPS RIGHT NOW AS THE PROGRESSION OF
THIS STORM COULD BE DELAYED BY THE RIDGE THAT WL BE IN PLACE. WL
STILL CONTINUE THE SLOW WARMING TREND IN TEMPS HOWEVER.

&&

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

&&

AVIATION...MK
PUBLIC...PUMA

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
1020 PM EDT THU APR 2 2009

INZ021-028>031-035>049-051>057-060>065-067>072-040230-
CARROLL-WARREN-TIPPECANOE-CLINTON-HOWARD-FOUNTAIN-MONTGOMERY-
BOONE-TIPTON-HAMILTON-MADISON-DELAWARE-RANDOLPH-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-
1020 PM EDT THU APR 2 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL INDIANA.

.DAY ONE...TONIGHT.

A STRONG LOW PRESSURE SYSTEM WILL MOVE INTO OHIO OVERNIGHT. THIS
WILL KEEP OCCASIONAL SHOWERS AND SCATTERED THUNDERSTORMS ACROSS
THE AREA. AN ISOLATED SEVERE STORM WITH DAMAGING WINDS IS
POSSIBLE. ALSO...ANY STORM WILL BE CAPABLE OF PRODUCING GUSTY
WINDS...SMALL HAIL...AND HEAVY RAIN.

LATER IN THE NIGHT WINDS OUTSIDE WILL BEGIN TO INCREASE WITH GUSTS
INTO THE 30 TO 40 MPH RANGE POSSIBLE.

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

WINDS MAY GUST INTO THE 35 TO 40 MPH RANGE ON FRIDAY.

THERE IS A CHANCE FOR THUNDERSTORMS ON SUNDAY. REMEMBER THAT
LIGHTNING IS A HAZARD WITH ANY STORM THAT FORMS.

.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)

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
659 PM EDT THU APR 2 2009

INZ064-065-071-072-022330-
BARTHOLOMEW-DECATUR-JACKSON-JENNINGS-
659 PM EDT THU APR 2 2009

...STRONG THUNDERSTORM ADVISORY FOR JENNINGS...NORTHEASTERN
JACKSON...SOUTHEASTERN BARTHOLOMEW AND SOUTHWESTERN DECATUR COUNTIES
UNTIL 730 PM EDT...

AT 657 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM 9 MILES EAST OF SEYMOUR TO 8 MILES EAST OF
SEYMOUR...AND MOVING NORTH AT 35 MPH.

SMALL HAIL...AND WINDS AROUND 40 MPH ARE EXPECTED WITH THESE STORMS.

* THESE STORMS WILL BE NEAR...
  HAYDEN AROUND 705 PM EDT...
  BUTLERVILLE AROUND 710 PM EDT...
  SCIPIO AROUND 715 PM EDT...
  AZALIA AROUND 720 PM EDT...

BE PREPARED TO TAKE SHELTER IN THE EVENT THESE STORMS INTENSIFY AND
BECOME SEVERE...OR A WARNING IS ISSUED BY THE NATIONAL WEATHER
SERVICE.

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