Area Forecast Discussion
Issued by NWS Indianapolis, IN

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000
FXUS63 KIND 270718
AFDIND

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE INDIANAPOLIS IN
315 AM EDT FRI MAR 27 2015

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

&&

.SYNOPSIS...
ISSUED AT 308 PM EDT THU MAR 26 2015

VERY COOL WEATHER PATTERN TO START THE WEEKEND AS A DEEP UPPER
TROUGH MOVES. RIDGING IN ITS WAKE PORTENDS A RETURN TO NEAR
NORMAL TEMPERATURES NEXT WEEK. COUPLE OF WEAK WEATHER SYSTEMS
TRACKING ACROSS SOUTHERN CANADA SUNDAY THROUGH THURSDAY HELP TO
BRING MILDER AIR BUT ALSO LOW THREAT FOR LIGHT RAIN WITH EACH.

&&

.NEAR TERM /REST OF TONIGHT/...

ISSUED AT 955 PM EDT THU MAR 26 2015

CLOUDS HAVE BROKEN UP ACROSS MUCH OF CENTRAL INDIANA AT THE
MOMENT...WITH THE EXCEPTION OF FAR NORTHERN SECTIONS. ADDITIONAL
CLOUD COVER LOOKS TO BE DEVELOPING ACROSS NORTHERN ILLINOIS...WITH
ADDITIONAL CLOUDS UPSTREAM ACROSS WISCONSIN.

AN APPROACHING UPPER TROUGH WILL HELP GUIDE THESE CLOUDS BACK INTO
CENTRAL INDIANA OVERNIGHT...SO BUMPED UP SKY COVER LATER TONIGHT.
THE CLOUDS SHOULD HELP TEMPERATURES FROM BOTTOMING OUT...AND
FORECAST ALREADY HAD THIS WELL REPRESENTED. THUS MADE NO CHANGES TO
TEMPERATURES.

PREVIOUS DISCUSSION FOLLOWS...
QUESTION OF HOW MUCH IF ANY OF BREAK IN CLOUD COVER DEVELOPS FOR
TONIGHT AND ITS IMPACT ON COOLING. FOR THE MOMENT THE UPPER TROUGH
APPROACHING FROM THE WEST HAS BEEN THICKENING AND RETURNING HIGHER
CLOUD DECK WHILE COLD ADVECTION ACTING IN THE SUNNIER AREAS NORTH
AND WEST OF HERE HAVE DEVELOPED STRATOCUMULUS DECKS. MODEL
SOUNDINGS INDICATE ENOUGH RESIDUAL LOW LEVEL MOISTURE UNDER
INFLUENCE OF APPROACHING TROUGH AND COLD ADVECTION SHOULD RESULT
IN A MOSTLY CLOUDY SKY. WILL BUMP MIN TEMPS UP A DEGREE OR TWO
BASED ON THIS BUT STILL EXPECTING MINS FROM 25 TO 30.


&&

.SHORT TERM /FRIDAY THROUGH SUNDAY/...

ISSUED AT 308 PM EDT THU MAR 26 2015

FORECAST CHALLENGE IS WHETHER ANY FLURRIES MAY OCCUR FRIDAY AND
TIMING OF SUNDAY SYSTEM.

UPPER TROUGH SWINGS ACROSS STATE DURING DAY FRIDAY. UPPER LEVELS
VERY DRY BUT LOW LEVELS REMAIN SOMEWHAT MOIST. FEEL LOW LEVEL
ANTICYCLONIC FLOW IN CLOUD BEARING LEVELS SHOULD OFFSET UPPER TROUGH
LIFT AND KEEP FLURRIES FROM OCCURRING.

WITH COLD ADVECTION AND ABUNDANT STRATOCUMULUS CLOUD MEANS
TEMPERATURES FRIDAY WILL CLIMB NO HIGHER THAN 35 TO 40 OR SIMILAR
TO CURRENT FORECAST. HAVE INCREASED CLOUD COVER FRIDAY RELATIVE TO
CURRENT FORECAST TO REFLECT THIS.

CLEARING SETS IN FRIDAY NIGHT AS SURFACE HIGH BUILDS DOWN AND
UPPER TROUGH SHIFTS A BIT FURTHER EAST. WITH DEWPOINTS FALLING TO
LOWER TEENS...NEAR RECORD LOWS WILL OCCUR SATURDAY.

SUNDAY...HAVE ADDED AFTERNOON RAIN CHANCES THOUGH A LOT OF VIRGA MAY
PRECEDE ANY RAIN AS MOISTURE IN COLUMN TAKES SOME TIME TO RECOVER.
MIGHT BE UNDER DOING WARM-UP OF TEMPS ON SUNDAY AS PRETTY DECENT
WARM ADVECTION SETS UP AHEAD OF NEXT SURFACE TROUGH. MAIN NEGATING
FEATURE WITH WARM-UP WILL BE ARRIVAL OF CLOUDS WITH THE TROUGH.
MODELS STILL DISAGREE WITH TIMING OF THESE CLOUDS AND RAIN BUT
HAVE BEEN FASTER THAN RECENT RUNS. WILL KEEP WITH MID 40S
NORTHEAST AND LOWER 50S SOUTHWEST.

&&

.LONG TERM /MONDAY THROUGH THURSDAY/...

ISSUED AT 315 AM EDT FRI MAR 27 2015

EXTENDED MODELS SUGGESTING THE WESTERN RIDGE AND EASTERN TROUGH
PATTERN WILL CHANGE NEXT WEEK WITH ZONAL PACIFIC FLOW TAKING OVER.
THIS WILL BRING WARMER TEMPERATURES CENTRAL INDIANA WITH 60S
POSSIBLE BY NEXT TUESDAY PER THE REGIONAL BLEND. ZONAL FLOW IN THE
EXTENDED TYPICALLY CAUSES TIMING ISSUES REGARDING ANY SYNOPTIC
SYSTEM...AND THIS WILL BE NO EXCEPTION. HOWEVER...THE MAIN SYSTEM TO
LOOK OUT FOR WILL BE A LOW PRESSURE SYSTEM THAT IS EXPECTED TO BRING
RAIN SHOWERS AND PERHAPS THUNDERSTORMS TO THE AREA MIDWEEK PER THE
REGIONAL BLEND. WE COULD ALSO SEE A FEW SHOWERS MONDAY NIGHT NORTH
ASSOCIATED WITH A WEAKER SYSTEM.

&&

.AVIATION /DISCUSSION FOR THE 270600Z TAFS/...
ISSUED AT 1208 AM EDT FRI MAR 27 2015

SOME SCATTERED CLOUDS BASED AROUND 040 OVERNIGHT EXPECTED TO
INCREASE TOWARDS/AFTER SUNRISE FRIDAY AS 850MB THERMAL TROUGH MOVES
OVERHEAD...RESULTING IN VFR CEILINGS NEAR THAT LEVEL AT THE TAF
SITES. THERE WILL ALSO BE SOME LAYERED CLOUD ABOVE.

NO VISIBILITY RESTRICTIONS EXPECTED THROUGH 271800Z.

SURFACE WINDS GENERALLY 320-350 DEGREES AT 5-8 KTS OVERNIGHT
EXPECTED TO INCREASE TO 12-15 KTS WITH OCCASIONAL GUSTS AROUND 20
KTS BY MIDDAY FRIDAY.

&&

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

$$

SYNOPSIS...TUCEK
NEAR TERM...TUCEK/50
SHORT TERM...TUCEK
LONG TERM....MK
AVIATION...JAS

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