Area Forecast Discussion
Issued by NWS Indianapolis, IN

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000
FXUS63 KIND 032011
AFDIND

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
311 PM EST TUE MAR 3 2015

.UPDATE...
THE SYNOPSIS...NEAR TERM...SHORT TERM...AND LONG TERM SECTIONS HAVE
BEEN UPDATED BELOW.

&&

.SYNOPSIS...
ISSUED AT 311 PM EST TUE MAR 3 2015

COLDER AIR WILL RETURN TO CENTRAL INDIANA FOR THE SECOND HALF OF THE
WORK WEEK. AS IT DOES...RAIN WILL CHANGE TO SNOW TONIGHT. SNOW WILL
FALL ACROSS PORTIONS OF THE AREA WEDNESDAY INTO EARLY
THURSDAY...WITH SIGNIFICANT ACCUMULATIONS POSSIBLE ACROSS FAR
SOUTHERN AREAS. HIGH PRESSURE WILL THEN PROVIDE DRY CONDITIONS WITH
A WARMING TREND THIS WEEKEND INTO EARLY NEXT WEEK.

&&

.NEAR TERM.../REST OF THIS AFTERNOON AND TONIGHT/
ISSUED AT 311 PM EST TUE MAR 3 2015

WARMER AIR CONTINUES TO FLOW INTO CENTRAL INDIANA THIS AFTERNOON
AHEAD OF A COLD FRONT. RAIN AND DRIZZLE ALONG WITH AREAS OF FOG WILL
CONTINUE AT TIMES THIS AFTERNOON. AS THE FRONT MOVES INTO THE AREA
THIS EVENING...RAIN WILL BECOME MORE FOCUSED ACROSS THE SOUTHEAST
HALF OF THE AREA.

GOOD ISENTROPIC LIFT WILL OCCUR THIS EVENING INTO THE EARLY PART OF
THE OVERNIGHT ACROSS THE SOUTHEAST HALF OF THE AREA...SO WENT LIKELY
TO CATEGORICAL POPS THERE. ACROSS THE NORTHWEST...WENT CHANCE POPS.
POPS WILL DIMINISH OVERNIGHT WITH MOST PLACES IN THE CHANCE CATEGORY
OR DRY BY 12Z.

AS THE COLDER AIR MOVES INTO THE AREA BEHIND THE COLD FRONT
OVERNIGHT RAIN WILL MIX WITH OR CHANGE TO SNOW FROM NORTHWEST TO
SOUTHEAST. HOWEVER BY THE TIME THE CHANGEOVER OCCURS MOST OF THE
PRECIPITATION WILL BE OUT OF THE AREA...SO EXPECT LITTLE IF ANY SNOW
ACCUMULATION TONIGHT.

MAV MOS LOOKS TOO COLD WITH LOW TEMPERATURES TONIGHT GIVEN THE
EXPECTED TIMING OF THE FRONT ALONG WITH EXPECTED CLOUD COVER. WENT
CLOSER TO A BLEND.

&&

.SHORT TERM.../WEDNESDAY THROUGH FRIDAY/
ISSUED AT 311 PM EST TUE MAR 3 2015

FOCUS IS ON THREAT FOR HEAVY SNOW ACROSS THE SOUTHERN FORECAST AREA
WEDNESDAY AND WEDNESDAY NIGHT. OVERALL THE MODELS ARE NOT TOO FAR
APART FROM EACH OTHER. THERE ARE SOME DIFFERENCES IN SNOW AMOUNTS
BUT THIS IS DUE IN PART TO A TIGHT GRADIENT EXPECTED. GENERALLY WENT
WITH A BLEND.

COLDER AIR WILL CONTINUE TO FLOW INTO THE AREA ON WEDNESDAY. THERE
MAY BE A MIX TO THE PRECIPITATION TYPE IN THE FAR SOUTH ON WEDNESDAY
BUT IT WOULD QUICKLY CHANGEOVER TO SNOW IN THE MORNING. ELSEWHERE
PRECIPITATION TYPE WILL BE SNOW.

FORCING INCREASES AGAIN DURING THE DAY WEDNESDAY AS A WAVE RIDES
ALONG THE COLD FRONT TO OUR SOUTH. ISENTROPIC LIFT CONTINUES...AND
OUR AREA GETS INTO THE RIGHT REAR QUADRANT OF AN UPPER JET WHICH
WILL PROVIDE ADDITIONAL LIFT. FRONTOGENETICAL FORCING WILL ALSO
INCREASE.

THE FOCUS FOR THE FORCING WILL BE TO THE SOUTH OF CENTRAL INDIANA
CLOSER TO THE FRONT. HOWEVER ENOUGH FORCING WILL BE ACROSS THE
SOUTHERN THIRD OF THE AREA TO GO LIKELY TO CATEGORICAL POPS
WEDNESDAY.

SIMILAR CONDITIONS CONTINUE WEDNESDAY NIGHT WITH BETTER POPS
SNEAKING A LITTLE FARTHER NORTH /STILL LIKELY TO CATEGORICAL
SOUTHEAST 1/3 OF THE AREA/. HOWEVER WITH THE CIRCULATION PROVIDED BY
THE UPPER JET EXPECT THE PRECIPITATION GRADIENT TO TIGHTEN EVEN
MORE. THE FAR NORTHWEST FORECAST AREA LOOKS TO BE DRY WEDNESDAY
NIGHT...WITH CHANCE POPS IN BETWEEN THAT AND THE HIGH POPS TO THE
SOUTH.

WITH PLENTY OF MOISTURE STILL AVAILABLE FOR THE SYSTEM...ESPECIALLY
ACROSS KENTUCKY...SIGNIFICANT SNOW AMOUNTS REMAIN POSSIBLE. THE
FACTORS MENTIONED ABOVE WILL PRODUCE A VERY TIGHT GRADIENT IN SNOW
AMOUNTS...GOING FROM LITTLE SNOW TO SIGNIFICANT SNOW IN A RELATIVELY
SMALL DISTANCE /ESPECIALLY CONSIDERING THE FRONTOGENETICAL FORCING/.

THE FAR SOUTHERN ROW OF COUNTIES IN CENTRAL INDIANA LOOK TO SEE THE
BEST CHANCE FOR SIGNIFICANT SNOW. HOWEVER WITH THE GRADIENT
MENTIONED ABOVE AM NOT CONFIDENT ENOUGH YET TO UPGRADE TO A WARNING.
AFTER COORDINATING WITH SURROUNDING OFFICES HAVE DECIDED TO LEAVE
THE CURRENT WINTER STORM WATCH AS IS AND LET ADDITIONAL DATA ARRIVE
BEFORE DECIDING TO GO TO WARNING. FOR NOW WENT NEAR 6 INCHES STORM
TOTAL IN THIS ROW WITH AMOUNTS QUICKLY TAPERING OFF TO THE NORTH.
WENT 2-3 INCHES IN BLOOMINGTON/COLUMBUS AREA AND AROUND 1 INCH IN
INDY.

AFTER THE SYSTEM MOVES OUT EARLY THURSDAY WENT DRY FOR THE REMAINDER
OF THE SHORT TERM WITH HIGH PRESSURE MOVING IN. THE ARCTIC AIR WILL
PROVIDE WELL BELOW AVERAGE TEMPERATURES...WITH BELOW ZERO READINGS
POSSIBLE THURSDAY NIGHT.

GENERALLY STAYED WITH A MODEL BLEND FOR TEMPERATURES DURING THE
PERIOD.

&&

.LONG TERM /FRIDAY NIGHT THROUGH NEXT TUESDAY/...
ISSUED AT 311 PM EST TUE MAR 3 2015

MUCH QUIETER WEATHER WILL BE THE RULE DURING THE LONG TERM AS MODEL
ENSEMBLES INDICATE A MORE ZONAL AND SLOWLY PROGRESSIVE UPPER
FLOW OVER MUCH OF THE U.S.  THE MEAN TROUGHINESS INITIALLY OVER THE
EASTERN PARTS OF THE COUNTRY WILL LIFT TO THE NORTHEAST BY EARLY
NEXT WEEK AS AN UPPER RIDGE BUILDS EAST INTO THE PLAINS.

A COUPLE OF SHORT WAVE TROUGHS MAY PASS THROUGH THE AREA DURING THIS
PERIOD...ONE AROUND SATURDAY AND ANOTHER AROUND SUNDAY NIGHT INTO
NEXT MONDAY. A FEW ENSEMBLE MEMBERS INDICATE VERY LIGHT QPF WITH
EACH OF THESE FEATURES...SUGGESTING MINOR CHANCES FOR SOME LIGHT
SNOW. HOWEVER...CHANCES FOR MEASURABLE NOT HIGH ENOUGH TO INCLUDE
IN THE FORECAST AT THIS TIME. WILL KEEP THE EXTENDED DRY.

TEMPERATURES WILL STILL BE COLD FRIDAY NIGHT...BUT MODERATE OVER
REST OF THE LONG TERM AS 850 MB TEMPERATURES SLOWLY RISE.  BY DAY 7
HIGHS WILL REACH THE LOWER ACROSS OUR SOUTHWEST.  ALL MODELS
INDICATE A TRANSITION TO MORE SPRING LIKE WEATHER BY THE MIDDLE TO
LATER PORTIONS OF NEXT WEEK.

&&

.AVIATION /DISCUSSION FOR THE 031800Z TAF ISSUANCE/...
ISSUED AT 1205 PM EST TUE MAR 3 2015

TEMPERATURES HAVE WARMED ABOVE FREEZING AND EXPECT ONLY RAIN REST OF
THIS AFTERNOON AND EARLY TONIGHT. WEATHER DEPICTION INDICATES
CEILINGS AVERAGING AROUND 5 HUNDRED FEET AND VISIBILITIES ONE AND
HALF TO TWO MILES.  EXPECT THESE CONDITIONS TO CONTINUE TO EARLY
TONIGHT FOLLOWED BY A SLIGHT IMPROVEMENT TONIGHT AS COLDER AND DRIER
AIR SPREADS SOUTHEAST ACROSS CENTRAL INDIANA.

PRECIPITATION WILL END OVER NORTHERN AND CENTRAL SECTIONS LATE
TONIGHT AND THERE SHOULD BE A SLOW IMPROVEMENT TO MVFR CEILINGS
AROUND 15 HUNDRED FEET.  A WEATHER DISTURBANCE MOVING INTO THE OHIO
VALLEY BY MIDDAY WEDNESDAY MAY BRING AN INCREASE IN SNOW OVER
CENTRAL SECTIONS AND SOUTHWARD.

MODEL SOUNDINGS INDICATE SOME LOW LEVEL WIND SHEAR REST OF THE
AFTERNOON. SOUTHERLY SURFACE WINDS OF 10 TO 12 KNOTS WILL VEER TO
THE WEST BY LATE AFTERNOON AND BECOME NORTHWEST 8 TO 10 KNOTS
OVERNIGHT TONIGHT AFTER COLD FRONT MOVES THROUGH.

&&

.IND WATCHES/WARNINGS/ADVISORIES...
WINTER STORM WATCH FROM WEDNESDAY AFTERNOON THROUGH THURSDAY MORNING
FOR INZ067>072.

&&

$$

SYNOPSIS...50
NEAR TERM...50
SHORT TERM...50
LONG TERM....JH
AVIATION...JH

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