272
FXUS63 KIWX 121009
AFDIWX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTHERN INDIANA
609 AM EDT FRI SEP 12 2025
KEY MESSAGES
- WARM TODAY WITH HIGH IN THE LOW TO MID 80S WITH LIGHT WINDS.
- BECOMING HOT EARLY NEXT WEEK WITH HIGHS IN THE LOWER 90S.
- LOW CHANCES FOR SHOWERS AND THUNDERSTORMS SATURDAY AND
SATURDAY NIGHT.
DISCUSSION
ISSUED AT 241 AM EDT FRI SEP 12 2025
A LARGE SURFACE HIGH PRESSURE AREA WAS OVER QUEBEC PROVINCE.
THIS SYSTEM WAS HELPING TO KEEP A LIGHT EAST FLOW OVER THE
FORECAST AREA. PATCHY GROUND FOG IS LIKELY TO DEVELOP BEFORE
DAYBREAK AS STRONG RADIATIONAL COOLING CONTINUES EARLY THIS
MORNING. THE FOG MAY BECOME LOCALLY DENSE, BUT IS NOT EXPECTED
TO BECOME WIDESPREAD. ANY LOWER VISIBILITIES WILL IMPROVE BY MID
TO LATE MORNING. DROUGHT/DRY GROUND CONDITIONS WILL PLAY A ROLE
IN ALLOWING TEMPERATURES TO RISE ABOVE NORMAL THIS AFTERNOON.
HIGHS SHOULD REACH THE MID 80S THIS AFTERNOON SOUTH OF HIGHWAY
30.
AN UPPER LEVEL RIDGE WILL BUILD EAST AND BECOME PROMINENT OVER
THE REGION EARLY NEXT WEEK. UPPER LEVEL HEIGHTS WILL EXCEED 5900
METERS ACROSS THE UPPER GREAT LAKES REGION. AS A RESULT,
TEMPERATURES WILL REMAIN WELL ABOVE NORMAL WITH HIGHS MAINLY IN
THE 80S. HOWEVER, HIGHS IN THE LOWER TO THE MID 90S, ESPECIALLY
SOUTH OF HIGHWAY 30 ARE BECOMING MORE LIKELY GIVEN THE
ANTECEDENTLY DRY CONDITION. THESE INITIAL DROUGHT CONDITIONS
WILL EXACERBATE THE DEVELOPING DROUGHT. THE UPDATED DROUGHT
MONITOR SHOWS D0 AND D1 HAD EXPANDED OVER THE FORECAST AREA.
THESE "ABNORMALLY DRY" TO "MODERATE DROUGHT" CONDITIONS ARE VERY
LIKELY TO EXPAND THROUGH THE FIRST HALF OF NEXT WEEK.
AVIATION /12Z TAFS THROUGH 12Z SATURDAY/
ISSUED AT 605 AM EDT FRI SEP 12 2025
NO SIGNIFICANT CHANGES TO THE TAFS WITH THIS UPDATE. A FEW MID-
LEVEL CLOUDS ARE NOTED UPSTREAM OVER ILLINOIS, TRACKING
SOUTHEAST. CLOUD BASES HAVE BEEN UPDATED ACCORDINGLY. HIGH
PRESSURE WILL CONTINUE TO PROVIDE TRANQUIL WEATHER CONDITIONS.
IWX WATCHES/WARNINGS/ADVISORIES
IN...NONE.
OH...NONE.
MI...NONE.
MARINE...NONE.
DISCUSSION...SKIPPER
AVIATION...BROWN
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