FXUS63 KIWX 201740

AFDIWX



Area Forecast Discussion

National Weather Service Northern Indiana

140 PM EDT Fri Mar 20 2026



.KEY MESSAGES...



- While overall temperatures will average out above normal,

  several large temperatures swings will be in store with highs

  ranging from the 40s to the 70s.



- Overall dry pattern through next week with just a low chance

  of rain on Sunday.



&&



.DISCUSSION...

Issued at 204 AM EDT Fri Mar 20 2026



Main weather challenge into Saturday lie with sorting out afternoon 

highs as the area remains just to the south of the track of yet 

another weak sfc low and upper level wave. A "cool" front is set to 

drop in from the N and NW later today into tonight, setting up a 

large spread in temps with low to mid 50s far NW and low to mid 70s 

south. Forecasted highs are in the 75th to 90th percentile, which 

could suggest they are overdone. However, dry airmass, strong mixing 

and increasing sun angle point towards a decent shot of 

overachieving. Thermal profiles begin to rebound Saturday, but still 

be several degrees cooler than today resulting in highs in the upper 

50s to upper 60s. 



WAA will peak Sat night/early Sun prior to the arrival of a northern 

stream trough and stronger cold front. Upper level ridging in the SW 

states as well as the lack of deep troughing will limit moisture 

influx ahead of the cold front with mid to maybe upper 50 dewpoints 

not arriving till later Sunday afternoon. This will all likely 

result in minimal chances for showers (isolated storm?) confined 

mainly to E/SE areas. Afternoon highs will be problematic as well 

with some areas seeing highs early in the day (NW) then steady or 

falling from N to S as the colder air settles in through the day. 

Areas south of US-30 and especially US-24 could pop well into the 

70s briefly before the colder air arrives. 



More pronounced, yet brief, shot of colder air arrives behind the 

front with more seasonable highs in store for Monday (40s) before 

the upper level ridge across the SW starts to edge east across the 

southern states to allow some moderation in temps through mid week 

as more of a west to east temp gradient sets up. A much stronger 

cold front and upper level trough arrives after Thursday to send 

back to near (possible below) normal levels.



&&



.AVIATION /18Z TAFS THROUGH 18Z SATURDAY/...

Issued at 134 PM EDT Fri Mar 20 2026



A mainly dry cold frontal passage will bring gusty 

northwesterly winds this afternoon through about 02z Sat before

winds slacken to more light and variable. Cigs will lower and

slight reductions in vsbys expected overnight between 08z

through 14z especially for KSBN however VFR conditions expected

through the remainder of the TAF period.



&&



.IWX WATCHES/WARNINGS/ADVISORIES...

IN...None.

OH...None.

MI...None.

MARINE...None.



&&



$$



DISCUSSION...Fisher

AVIATION...Andersen