287
FXUS63 KIWX 071809
AFDIWX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTHERN INDIANA
209 PM EDT WED OCT 7 2026
KEY MESSAGES
- DRY WEATHER IS EXPECTED TO CONTINUE INTO THE START OF THE
WEEKEND. VERY WARM ON SATURDAY WITH HIGHS IN THE 80S.
- THERE IS A 40-70% CHANCE OF RAIN SATURDAY NIGHT THROUGH SUNDAY.
DISCUSSION
ISSUED AT 208 PM EDT WED OCT 7 2026
A PLEASANT FALL AFTERNOON ONCE AGAIN, THROUGH A TOUCH BREEZY WITH
SOUTHWESTERLY WIND GUSTS OF 20-25 MPH. THE PRESSURE GRADIENT HAS
INCREASED IN RESPONSE TO LOW PRESSURE OVER THE HUDSON BAY AND
PERSISTENT HIGH PRESSURE OVER THE CAROLINAS. THIS LOW HAS A TRAILING
COLD FRONT NOSING INTO NORTHERN ILLINOIS THIS AFTERNOON. ABUNDANT
DRY AIR PRECLUDES ANY RAIN CHANCES WITH THIS FRONT. COOLER TOMORROW,
ESPECIALLY DOWNWIND OF LAKE MICHIGAN, YET SOUTHERN AREAS WILL REMAIN
PLEASANT IN THE MID-70S.
TURNING TO FRIDAY AND THE WEEKEND, INCREASING OPPORTUNITIES FOR RAIN
AS THE JET STREAM BUCKLES IN RESPONSE TO A PACIFIC NORTHWEST TROUGH.
THE DOWNSTREAM RIDGE AMPLIFIES OVER THE EASTERN SEABOARD SENDING A
SURGE OF WARMTH POLEWARD FOR THE WEEKEND. AMID THIS PATTERN CHANGE,
A MODEST WARM FRONT MAY SERVE AS THE FOCUS FOR ISOLATED SHOWERS OVER
ILLINOIS AS EARLY AS FRIDAY. WE RETAIN A DRY FORECAST AT THIS TIME
WITH THE BEST FOCUS FOR LIFT A MOISTURE COLOCATED TO OUR WEST, YET
THIS WILL BE A MODEST FEATURE TO KEEP AN EYE ON.
OF GREATER INTEREST IS TROPICAL STORM ISAIAS, WHICH IS FORECAST TO BE
SWEPT NORTHWARD IN THE COMING DAYS. THIS WEEKEND, THE PRIMARY
STEERING MECHANISM FOR THIS SYSTEM WILL BE THE INCOMING PACIFIC
NORTHWEST TROUGH AND A SUBTROPICAL RIDGE OVER THE MID-ATLANTIC
COAST. THERE CONTINUES TO BE SOME DISAGREEMENT IN THE EAST-WEST
NATURE OF THE TRACK OF ISAIAS, AND SO OUR FORECAST CONTINUES TO
CARRY A 40-70% CHANCE OF RAIN AS EARLY AS SATURDAY NIGHT
LINGERING INTO SUNDAY, WITH THE GREATEST RAIN CHANCES WELL AWAY
FROM LAKE MICHIGAN. SIGNIFICANT IMPACTS ARE NOT EXPECTED.
ANOTHER AREA OF LOW PRESSURE TRACKS THROUGH THE MIDWEST LATER MONDAY
AND TUESDAY, REPRESENTING OUR NEXT CHANCE FOR RAIN, WITH CONTINUED
FLUXUATIONS IN DAILY HIGH TEMPERATURES.
AVIATION /18Z TAFS THROUGH 18Z THURSDAY/
ISSUED AT 1237 PM EDT WED OCT 7 2026
HIGH PRESSURE CONTINUES TO PROVIDE TRANQUIL AND DRY CONDITIONS.
EXPECT VFR CEILINGS THROUGH THE TAF PERIOD (WITH VERY FEW
CLOUDS AT ALL) WITH WEST WINDS BETWEEN 5-10 KNOTS. THERE COULD
STILL BE A FEW GUSTS THIS AFTERNOON TO 20 KTS ALONG AND EAST OF
I-69, BUT OTHERWISE, WINDS WILL BE RELAXING THIS EVENING AND
OVERNIGHT.
IWX WATCHES/WARNINGS/ADVISORIES
IN...NONE.
OH...NONE.
MI...NONE.
MARINE...NONE.
DISCUSSION...BROWN
AVIATION...JOHNSON
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