151
FXUS63 KIWX 200935
AFDIWX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTHERN INDIANA
535 AM EDT TUE OCT 20 2026
KEY MESSAGES
- DRY AND PLEASANT WEATHER PERSISTS THROUGH THE ENTIRE WEEK WITH
HIGHS EITHER SIDE OF 70, LOWS IN THE 40S, AND NO RAIN UNTIL
NEXT WEEK AT THE EARLIEST.
DISCUSSION
ISSUED AT 126 AM EDT TUE OCT 20 2026
UPPER FLOW ACROSS AREA EAST OF THE ROCKIES IS RELATIVELY WEAK AS MID
LEVEL RIDGING AND A COUPLE SURFACE HIGH PRESSURE CENTERS PAIR TO
KEEP THE AREA DRY. AS THE FIRST HIGH PRESSURE CENTER MOVES INTO
SOUTHEAST CANADA FROM THE NORTHERN GREAT LAKES, A BACKDOOR COLD
FRONT SETS UP EAST OF MI AND NORTH OF OH, WHICH MAY BE ABLE TO
ADVECT MARINE AIR INTO OUR EAST POTENTIALLY SETTING THEM UP FOR
MORNING FOG WED AM. ANOTHER NORTHERN STREAM WAVE AND TRAILING
SURFACE HIGH PASS BY TO THE NORTH OF THE AREA WED THROUGH THU TIME
FRAME. BECAUSE THE FRONT WASHES OUT ACROSS THE AREA WED NIGHT,
MINIMAL LOWERING OF TEMPS OCCURS FOR FRIDAY (FROM MID 60S TO LOW 70S
THU TO LOW TO UPPER 60S FRI). WITH THE MID LEVEL RIDGING STILL
STAUNCHLY IN PLACE ACROSS THE PLAINS STATES AND MISSISSIPPI VALLEY,
TROUGHING IN THE WEST STRUGGLES TO ADVANCE EASTWARD AND SURFACE LOWS
TAKE A NORTH-NORTHEASTERLY TRACK INTO SOUTHCENTRAL CANADA. SO, IT
COULD BE UNTIL THE FIRST PART OF THE NEXT WORK WEEK BEFORE WE
GET OUR NEXT RAIN INTO THE AREA. THERE ARE HINTS THAT THE MID
LEVEL RIDGE FINALLY PUSHES EASTWARD AT THIS TIME AND THIS HELPS
SOME COMBINATION OF A DIVING WAVE WITHIN THE NORTHERN STREAM AND
SOME SOUTHERN STREAM MOISTURE TO MAKE IT UP THIS WAY TO PROVIDE
RAIN.
AVIATION /06Z TAFS THROUGH 06Z WEDNESDAY/
ISSUED AT 533 AM EDT TUE OCT 20 2026
SURFACE HIGH PRESSURE OVER THE NORTHERN GREAT LAKES PUSHING EAST
PAIRS WITH MID LEVEL RIDGING TO QUELL RAIN CHANCES DURING THE TAF
PERIOD. THIS PATTERN ALLOWS PREVAILING EAST WINDS THROUGH THE BULK
OF THIS PERIOD. A FEW HOURS OF PATCHY FOG WILL BE POSSIBLE THIS
MORNING, BUT APPEARS TO BE STAYING AWAY FROM THE TERMINALS. AS
A BACKDOOR FRONT SETTLES EAST OF MI AND NORTH OF OH, HI- RES
GUIDANCE IS PRODUCING ADVECTION FOG THAT COULD AFFECT FWA WED
AM. WILL PROJECT SBN STAYS OUT OF THE FOG IN THIS TAF ISSUANCE.
OTHERWISE, EXPECT VFR CONDITIONS PREVAIL THROUGH THE REST OF
THE TAF PERIOD.
IWX WATCHES/WARNINGS/ADVISORIES
IN...NONE.
OH...NONE.
MI...NONE.
MARINE...NONE.
DISCUSSION...ROLLER
AVIATION...ROLLER
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page