864
FXUS63 KIWX 251807
AFDIWX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTHERN INDIANA
207 PM EDT MON MAY 25 2026
KEY MESSAGES
- WARM WITH HIGHS GENERALLY IN THE LOW 80S THROUGH WEDNESDAY,
THEN IN THE MID TO UPPER 70S THURSDAY THROUGH THIS WEEKEND.
- OUTSIDE OF A LOW CHANCE FOR SHOWERS AND ISOLATED STORMS ON
WEDNESDAY (10-40%, MAINLY SOUTH OF US 30), DRY CONDITIONS ARE
FAVORED THROUGH THIS WEEKEND.
DISCUSSION
ISSUED AT 207 PM EDT MON MAY 25 2026
QUIET, PLEASANT WX WILL PERSIST INTO TONIGHT AND TUESDAY AS A NARROW
LOW LEVEL RIDGE AXIS HOLDS OVER THE REGION. LIGHT/VARIABLE WINDS AND
ONLY SOME PASSING HIGH CLOUDS MAY SUPPORT FOG DEVELOPMENT AGAIN
TOWARD DAYBREAK TOMORROW, THOUGH MIXOUT OF DRIER AIR AND RESULTING
LOWER CROSSOVER VALUES SHOULD LIMIT THIS TO LESS IMPACTFUL SHALLOW
GROUND FOG.
ON WEDNESDAY, A CUT-OFF LOW WILL LIFT SLOWLY INTO THE OH VALLEY WITH
LOW CHANCES (20-40%) FOR SHOWERS AND ISOLATED STORMS ON THE NORTHERN
FRINGE OF ITS DEEPER MOISTURE INTO AREAS MAINLY SOUTH OF THE US 30
CORRIDOR. MEANWHILE, AN UPPER LEVEL SHORTWAVE DROPPING SOUTHEAST
THROUGH ONTARIO AND THE EASTERN GREAT LAKES WILL DRIVE A BACKDOOR
COLD FRONT TO NEAR THE MI BORDER BY LATE WEDNESDAY
AFTERNOON/EVENING. THIS FEATURE MAY GENERATE A FEW LATE DAY/EVENING
SHOWERS HERE GIVEN THE CONVERGENCE AND WEAK BOUNDARY LAYER
DESTABILIZATION. OVERALL, THE BULK OF THE AREA LIKELY REMAINS RAIN-
FREE WITH AFTERNOON TEMPERATURES ONCE AGAIN MAKING A RUN AT THE LOW
80S.
AN EXPANSIVE LOW LEVEL ANTICYCLONE OVER THE GREAT LAKES REGION WILL
PROVIDE A STRETCH OF FAIR WX, LOW HUMIDITY AND SEASONABLE
TEMPERATURES THURSDAY THROUGH THIS WEEKEND. THIS WILL OCCUR IN
RESPONSE TO A DEVELOPING PSEUDO-OMEGA BLOCKING PATTERN, WITH THE
LOCAL AREA NESTLED BETWEEN NORTHEAST CONUS UPPER TROUGHING, AND
ANOMALOUS RIDGING OVER THE UPPER MIDWEST AND SOUTH-CENTRAL
CANADA.
AVIATION /18Z TAFS THROUGH 18Z TUESDAY/
ISSUED AT 1239 PM EDT MON MAY 25 2026
HIGH PRESSURE OVER THE EASTERN GREAT LAKES WILL CONTINUE TO
PROMOTE GENERALLY TRANQUIL CONDITIONS. HIGH CLOUD ARE STREAMING
IN FROM LOW PRESSURE OVER THE TENNESSEE VALLEY, WHILE A MID-
LEVEL DECK IS NOTED SEEPING FROM SOUTHERN WISCONSIN.
TONIGHT, FOG APPEARS PROBABLE AT KFWA WHERE DEW POINT
DEPRESSIONS AND SUBSEQUENT CROSSOVER TEMPERATURE IS LOWER THAN
KSBN. THEREFORE, HAVE CONTINUED THE INHERITED BR.
IWX WATCHES/WARNINGS/ADVISORIES
IN...NONE.
OH...NONE.
MI...NONE.
MARINE...NONE.
DISCUSSION...STEINWEDEL
AVIATION...BROWN
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