Special Weather Statement, NWS Indianapolis, IN

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
907 PM EDT SUN APR 1 2012

.UPDATE...
THE NEAR TERM SECTION HAS BEEN UPDATED BELOW

&&

.SYNOPSIS...
A FRONTAL SYSTEM IS EXPECTED TO MEANDER ACROSS THE LOCAL AREA
THROUGH TUESDAY NIGHT. THE FRONT WILL GET A SHOVE FARTHER SOUTH
TOWARDS THE MIDDLE OF THE WEEK AS A LOW PRESSURE ZONE MOVES THROUGH
THE TENNESSEE VALLEY. IN THE WAKE OF THIS LOW...HIGH PRESSURE IS
EXPECTED TO MOVE INTO THE AREA THROUGH THE END OF THE WEEK. ANOTHER
FRONTAL SYSTEM MAY APPROACH THE AREA FROM THE WEST LATE NEXT WEEKEND.

&&

.NEAR TERM /OVERNIGHT/...

ISOLATED CONVECTION HAS FINALLY FIRED ALONG THE FRONTAL BOUNDARY
AND IN THE VICINITY OF A WEAK UPPER LEVEL VORT ACROSS THE NORTHERN
FORECAST AREA. IN ABSENCE OF MORE SIGNIFICANT BL SHEAR...STORMS
ARE PULSING IN INTENSITY BUT REMAINING BELOW SEVERE LEVELS. THE
REMNANTS OF THE CAPPING INVERSION AND AVAILABLE CONVECTIVE
INHIBITION ARE LIKELY HELPING TO LIMIT CONVECTIVE INTENSITY AND
COVERAGE.

HAVE READJUSTED POPS FOR THE REMAINDER OF THE EVENING TO FOCUS 30
POPS ACROSS EASTERN SECTIONS OF THE FORECAST AREA WHERE CURRENT
CONVECTION LIKELY TO IMPACT. THESE STORMS WILL MOVE SOUTHEAST AT
20-25KTS AND SHOULD BE OUT OF THE EASTERN COUNTIES AROUND OR
SHORTLY AFTER MIDNIGHT. WHILE STORMS WILL BE CAPABLE OF SMALL HAIL
AND HEAVY RAINFALL...OVERALL SEVERE THREAT LOOKS GREATLY
DIMINISHED FOR THE EVENING WITH PRESENCE OF THE REMNANT CAP STILL
IN PLACE. HAVE REMOVED POPS FROM WESTERN COUNTIES WHERE ATMOSPHERE
IS LESS FAVORABLE FOR CONVECTIVE DEVELOPMENT. FRONTAL BOUNDARY
WILL CONTINUE TO DROP SOUTH OVERNIGHT OT NEAR THE OHIO RIVER BY
DAYBREAK. ONCE THE UPPER LEVEL VORT MOVES AWAY TO THE EAST AFTER
MIDNIGHT HOWEVER...NOT EXPECTING ANY ADDITIONAL CONVECTIVE
DEVELOPMENT WITH LITTLE APPRECIABLE FORCING LEFT. TWEAKED TEMPS UP
A DEGREE AND BUMPED UP CLOUD COVERAGE JUST A BIT OVERNIGHT AS
WELL. MAY SEE LOCALIZED PATCHY FOG DEVELOP TOWARDS DAYBREAK WITH
LEFTOVER LOW LEVEL MOISTURE PRESENT.

ZONE AND GRID UPDATES OUT.

&&

.SHORT TERM /MONDAY THROUGH WEDNESDAY/...
MODEL DATA SUGGEST UPPER RIDGING SHOULD HOLD ACROSS THE OHIO VALLEY
INTO THE MIDDLE OF THE WEEK...ALTHOUGH THE RIDGE MAY TEMPORARY
FLATTEN AT TIMES BY DISTURBANCES COMING OUT OF THE NORTHWEST AND BY
AN UPPER LOW THAT IS EXPECTED TO SLOWLY MOVE INTO THE PLAINS BY THE
MIDDLE OF NEXT WEEK.

COLD FRONT THAT WILL BE DROPPING SOUTH THROUGH THE AREA TONIGHT IS
EXPECTED TO STALL OUT OVER OR NEAR THE SOUTHWEST ZONES ON MONDAY.
DON/T REALLY SEE MUCH IN THE WAY OF UPPER SUPPORT FOR PRECIPITATION
ON MONDAY...HOWEVER THE MODELS DO SUGGEST AN INSTABILITY AXIS NEAR
THE FRONTAL ZONE. WILL GO WITH SMALL CHANCE POPS OVER THE SOUTHWEST
ZONES FOR MONDAY AFTERNOON.

WARM ADVECTION EXPECTED TO DEVELOP MONDAY NIGHT AHEAD OF AN
APPROACHING SURFACE LOW PRESSURE ZONE. LIFT FROM THE WARM ADVECTION
COUPLED WITH STEEP MID LEVEL LAPSE RATE MAY RESULT IN SOME
CONVECTION. WILL GO WITH CHANCE POPS ALL AREAS MONDAY NIGHT. WILL
CONTINUE WITH CHANCE POPS ON TUESDAY AND TUESDAY NIGHT AS SURFACE
LOW AND TRAILING COLD FRONT MOVE THROUGH.

THERE ARE SOME DIFFERENCES IN THE MODELS WITH RESPECT TO HOW FAR
FRONT GETS SHOVED TO THE SOUTH BY WEDNESDAY...BUT THE MAJORITY OF
THE ENSEMBLE DATA SUGGEST PRECIPITATION CHANCES BY WEDNESDAY ARE
DIMINISHING...ESPECIALLY IN THE NORTH. WILL BEGIN TAKING THE POPS
OUT OF THE FORECAST IN THE NORTH FOR NOW...AND LEAVE THEM GOING IN
THE SOUTH.

PROGGED LOW LEVEL THICKNESSES GENERALLY SUPPORT THE GFS MOS GUIDANCE
UNTIL TUESDAY...WHERE THE GUIDANCE LOOKS TOO WARM. WILL NUDGE DOWN
THE HIGHS TUESDAY AND THE LOWS TUESDAY NIGHT SEVERAL DEGREES.

&&

.LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/...
WEDNESDAY NIGHT AND THURSDAY A FRONTAL SYSTEM ASSOCIATED WITH AN
UPPER LEVEL CUTOFF LOW WILL MOVE EAST FROM THE PLAINS AND BRING
CHANCES FOR THUNDERSTORMS TO THE AREA. IT LOOKS LIKE THE FRONT WILL
REMAIN SOUTH OF THE AREA SO WILL KEEP HIGHEST CHANCES IN THE SOUTH
AND TAPER LOWER TO THE NORTH. SOME DISAGREEMENT BETWEEN THE ECMWF
AND GFS ON THE HANDLING OF THE UPPER LOW WITH THE GFS BRINGING IT
FURTHER NORTH AND ACROSS THE AREA AND THE ECM MOVING IT THROUGH THE
SOUTHEASTERN US. ECM HAS THE BACKING OF THE ENSEMBLES AND THUS
PREFER TO LEAN TOWARD IT/S SOLUTION FOR THURSDAY NIGHT AND FRIDAY
AND THUS WILL GO DRY THOSE DAYS. RIDGING BUILDS IN AND DRY WEATHER
UNTIL ANOTHER FRONTAL SYSTEM HEADS THROUGH THE NORTHERN GREAT LAKES
AT THE END OF THE WEEKEND. TEMPERATURES IN THE 60S FOR HIGHS AND
UPPER 30S TO 40S FOR LOWS FROM THE INITIALIZATION LOOK GOOD.

&&

.AVIATION /DISCUSSION FOR 020000Z TAFS/...

SCATTERED TSRA EARLY MAY PROVIDE BRIEF MVFR OR BELOW DURING THE
EVENING...THEN MVFR CONDITIONS EXPECTED AT MOST SITES OVERNIGHT. VFR
WILL RETURN FOR MUCH OF THE DAY MONDAY.

CURRENT CONVECTIVE PARAMETERS AND MODEL FORECASTS INDICATE ONLY
SCATTERED CONVECTION POSSIBLE ACROSS CENTRAL INDIANA THROUGH 04-06Z
OR SO. WILL WATCH RADAR TRENDS...BUT FOR NOW ONLY PLAN TO INCLUDE A
CB MENTION. OF COURSE ANY SITE THAT DOES ENCOUNTER A TSRA COULD SEE
MVFR OR BELOW FOR A BRIEF PERIOD.

AS A COLD FRONT SETTLES SOUTH ACROSS THE SITES TONIGHT...COOLER AIR
WILL MOVE IN ON NORTHEAST WINDS. THIS SHOULD SET THE STAGE FOR SOME
MVFR FOG AT MOST SITES. WITH A NORTHEAST WIND KIND MAY MISS OUT ON
THE FOG. MODELS SHOW THE WORST FOG ACROSS KHUF/KBMG...WHERE SOME
STRATUS MAY ALSO FORM.

HEATING/MIXING ON MONDAY SHOULD BREAK UP ANY CEILINGS AND FOG
LEAVING BEHIND VFR CONDITIONS.

&&

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

&&

SYNOPSIS...JAS
NEAR TERM...RYAN
SHORT TERM...JAS
LONG TERM....CP
AVIATION...50

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
849 PM EDT SUN APR 1 2012

INZ021-030-031-037>042-047>049-055>057-064-065-072-021000-
CARROLL-CLINTON-HOWARD-BOONE-TIPTON-HAMILTON-MADISON-DELAWARE-
RANDOLPH-MARION-HANCOCK-HENRY-JOHNSON-SHELBY-RUSH-BARTHOLOMEW-
DECATUR-JENNINGS-
849 PM EDT SUN APR 1 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL INDIANA.

.DAY ONE...TONIGHT.

OUTLOOK: SCATTERED THUNDERSTORMS THIS EVENING.

HAZARDS: MAIN THREATS WILL BE HAIL AND LIGHTNING. ADDITIONAL
THREATS INCLUDE GUSTY WINDS AND BRIEF HEAVY RAINFALL. AN ISOLATED
SEVERE THUNDERSTORM IS POSSIBLE THIS EVENING...MAINLY NORTHEAST OF
INDIANAPOLIS.

TIMING: THROUGH 1 AM.

DISCUSSION: SCATTERED THUNDERSTORMS WILL BE POSSIBLE THIS EVENING AS
A FRONTAL BOUNDARY SAGS SOUTH ACROSS THE REGION. THUNDERSTORMS
WILL DIMINISH AFTER MIDNIGHT AS THE FRONT DROPS TO NEAR THE OHIO
RIVER.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

OUTLOOK: THUNDERSTORMS WILL BE POSSIBLE AT TIMES MONDAY NIGHT
THROUGH THURSDAY. WHILE WIDESPREAD SEVERE STORMS ARE NOT
EXPECTED...AN ISOLATED STRONG STORM CANNOT BE RULED OUT. BRIEF
HEAVY RAINFALL AND DANGEROUS LIGHTNING CAN BE EXPECTED FROM ANY
THUNDERSTORM THAT DEVELOPS.

DISCUSSION: A PERSISTENT FRONTAL BOUNDARY IN THE REGION MAY SPARK
THUNDERSTORMS AT TIMES THROUGH MID WEEK.

.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)

INZ028-029-035-036-043>046-051>054-060>063-067>071-021000-
WARREN-TIPPECANOE-FOUNTAIN-MONTGOMERY-VERMILLION-PARKE-PUTNAM-
HENDRICKS-VIGO-CLAY-OWEN-MORGAN-SULLIVAN-GREENE-MONROE-BROWN-KNOX-
DAVIESS-MARTIN-LAWRENCE-JACKSON-
849 PM EDT SUN APR 1 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL INDIANA.

.DAY ONE...TONIGHT.

OUTLOOK: NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

HAZARDS: NONE.

TIMING: NONE.

DISCUSSION: A FRONTAL BOUNDARY WILL SAG ACROSS THE REGION
TONIGHT...WITH SCATTERED THUNDERSTORMS THIS EVENING TO THE NORTH
AND EAST OF INDIANAPOLIS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY.

OUTLOOK: THUNDERSTORMS WILL BE POSSIBLE AT TIMES MONDAY NIGHT
THROUGH THURSDAY. WHILE WIDESPREAD SEVERE STORMS ARE NOT
EXPECTED...AN ISOLATED STRONG STORM CANNOT BE RULED OUT. BRIEF
HEAVY RAINFALL AND DANGEROUS LIGHTNING CAN BE EXPECTED FROM ANY
THUNDERSTORM THAT DEVELOPS.

DISCUSSION: A PERSISTENT FRONTAL BOUNDARY IN THE REGION MAY SPARK
THUNDERSTORMS AT TIMES THROUGH MID WEEK.

.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)

RYAN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
928 PM EDT SUN APR 01 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0922 PM     HAIL             MUNCIE                  40.20N  85.39W
04/01/2012  E0.75 INCH       DELAWARE           IN   PUBLIC

&&

EVENT NUMBER IND1200139

MDR

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
928 PM EDT SUN APR 1 2012

INZ041-042-049-020215-
DELAWARE-HENRY-RANDOLPH-
928 PM EDT SUN APR 1 2012

...STRONG THUNDERSTORM ADVISORY FOR SOUTHERN DELAWARE...NORTHEASTERN
HENRY AND SOUTHWESTERN RANDOLPH COUNTIES UNTIL 1015 PM EDT...

AT 925 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 5 MILES SOUTHEAST OF MUNCIE...MOVING SOUTHEAST AT
25 MPH.

HAIL UP TO THE SIZE OF PENNIES IS EXPECTED WITH THIS STORM.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  PRAIRIE CREEK RESERVOIR...
  PARKER CITY...
  MOUNT SUMMIT...
  SUMMIT LAKE STATE PARK...
  BLOUNTSVILLE...
  MOORELAND...
  LOSANTVILLE...
  MODOC...

&&

LAT...LON 4000 8490 4000 8519 3988 8520 3987 8521
      3985 8521 3984 8522 4017 8558 4017 8557
      4026 8533 4001 8488
TIME...MOT...LOC 0128Z 310DEG 22KT 4013 8531

AB/RYAN

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
931 PM EDT SUN APR 01 2012

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0928 PM     HAIL             2 ESE ARCADIA           40.16N  85.99W
04/01/2012  M0.70 INCH       HAMILTON           IN   TRAINED SPOTTER

&&

EVENT NUMBER IND1200140

MDR

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
932 PM EDT SUN APR 1 2012

INZ039-040-048-049-020215-
HAMILTON-HANCOCK-HENRY-MADISON-
932 PM EDT SUN APR 1 2012

...STRONG THUNDERSTORM ADVISORY FOR NORTHEASTERN HAMILTON...
NORTHEASTERN HANCOCK...WESTERN HENRY AND SOUTHERN MADISON COUNTIES
UNTIL 1015 PM EDT...

AT 929 PM EDT...STORM SPOTTERS REPORTED A STRONG THUNDERSTORM WITH
DIME SIZE HAIL AT 7 MILES NORTHEAST OF NOBLESVILLE...OR 15 MILES
WEST OF ANDERSON...MOVING SOUTHEAST AT 25 MPH.

HAIL UP TO THE SIZE OF PENNIES IS EXPECTED WITH THIS STORM.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
  ANDERSON...
  LAPEL...
  EDGEWOOD...
  RIVER FOREST...
  FORTVILLE...
  INGALLS...
  PENDLETON...
  MARKLEVILLE...
  WILKINSON...
  SHIRLEY...

&&

LAT...LON 3979 8567 4013 8613 4022 8604 4022 8589
      3998 8546
TIME...MOT...LOC 0131Z 310DEG 22KT 4014 8596

AB/RYAN