526
FXUS63 KLOT 051122
AFDLOT
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHICAGO/ROMEOVILLE, IL
622 AM CDT SUN OCT 5 2025
KEY MESSAGES
- JULY-LIKE WARMTH CONTINUES THROUGH MONDAY.
- STRONGER WINDS AND CONTINUED DRY CONDITIONS WILL RESULT IN
HEIGHTENED FIRE DANGER AND AREAS OF BLOWING THIS AFTERNOON.
- COLD FRONT WILL BRING RAIN CHANCE MONDAY AND ESPECIALLY MONDAY
NIGHT, FOLLOWED BY MORE SEASONABLE TEMPERATURE FOR THE REST OF
THE UPCOMING WORK WEEK.
DISCUSSION
ISSUED AT 242 AM CDT SUN OCT 5 2025
OUR STRETCH OF UNSEASONABLY WARM AND DRY CONDITIONS WILL CONTINUE
THROUGH MONDAY BEFORE MORE SEASONABLE TEMPERATURES ARRIVE
FOLLOWING A COLD FRONTAL PASSAGE MONDAY NIGHT. A PERIOD OF
SHOWERS AND A FEW THUNDERSTORMS WILL ALSO ACCOMPANY THIS
FRONTAL ZONE MONDAY NIGHT.
FIRE WEATHER CONCERNS INCREASE IN OUR AREA ON SUNDAY AS THE
UNSEASONABLY WARM WEATHER COMBINES WITH INCREASINGLY WINDY AND
VERY DRY AFTERNOON CONDITIONS (REFERENCE THE FIRE WEATHER
SECTION BELOW FOR MORE ON THIS). A TIGHTENING PRESSURE GRADIENT
AND A DEEPLY MIXED BOUNDARY LAYER WILL FOSTER STRONGER GUSTY
SOUTHWEST WINDS FROM LATE MORNING THROUGH LATE THIS AFTERNOON.
CONDITIONS CONTINUE TO SUPPORT THE IDEA FOR AT LEAST A COUPLE
HOUR PERIOD IN THE AFTERNOON WITH PEAK GUSTS TO AROUND 30 MPH.
WITH THE VERY DRY CONDITIONS AND INCREASED FARMING ACTIVITY, THE
GUSTY WINDS COULD ALSO RESULT IN SOME AREAS OF BLOWING DUST IN
OPEN AREAS, BUT NOT CURRENTLY EXPECTING THIS TO CAUSE BIG ENOUGH
PROBLEMS TO REQUIRE A BLOWING DUST ADVISORY. NEVERTHELESS, WE
WILL MAINTAIN MENTION OF PATCHY BLOWING DUST THIS AFTERNOON.
THE WEATHER PATTERN WILL BEGIN TO TRANSITION ON MONDAY AS AN UPPER
TROUGH SLIDES EASTWARD INTO THE UPPER MISSISSIPPI VALLEY AND
WESTERN GREAT LAKES LATE MONDAY AND MONDAY NIGHT. AS IT DOES, AN
ASSOCIATED SURFACE COLD FRONT WILL MOVE SOUTHWARD INTO FAR
NORTHERN IL BY LATE MONDAY AFTERNOON. UNSEASONABLY WARM WEATHER
WILL PERSIST IN ADVANCE OF THE FRONT, SO EXPECT HIGH
TEMPERATURES FOR MONDAY TO ONCE AGAIN CLIMB INTO THE 80S.
A PERIOD OF SHOWERS (AND EVEN A FEW STORMS) ARE EXPECTED MONDAY
NIGHT INTO EARLY TUESDAY AS WE MAKE THIS TRANSITION TO A COOLER
AIRMASS. THE ANAFRONTAL NATURE OF THE COLD FRONT SHOULD RESULT IN
MOST OF THE PRECIPITATION OCCURRING BEHIND THE FRONT, THUS MAKING
THE MONDAY NIGHT THROUGH EARLY TUESDAY MORNING PERIOD THE MOST
FAVORED FOR RAIN. THE COMBINATION OF MESOSCALE FORCED ASCENT
ALONG THE BAROCLINIC ZONE WITH THE LARGER SCALE FORCING WITHIN
THE ENTRANCE REGION OF THE UPPER JET MAY SUPPORT SOME NARROWER
CORRIDORS OF HIGHER RAINFALL AMOUNTS INTO TUESDAY MORNING.
NEVERTHELESS, IT APPEARS UNLIKELY THAT THIS PERIOD OF RAIN WILL
SIGNIFICANTLY CUT INTO OUR LARGE PRECIPITATION DEFICITS OVER THE
PAST COUPLE MONTHS. ACCORDINGLY, LARGE SCALE MAJOR DROUGHT
IMPROVEMENT APPEARS UNLIKELY AT THIS TIME.
COOLER, MORE SEASONABLE TEMPERATURES ARE EXPECTED TUESDAY THOUGH
MUCH OF THE UPCOMING WORK WEEK. AFTER RAIN ENDS TUESDAY, DRY
WEATHER SHOULD RESUME FOR MUCH OF THE REMAINDER OF THE WEEK.
THE ONLY EXCEPTION BEING A SMALL CHANCE FOR A FEW SHOWERS WITH
ANOTHER WEAK IMPULSE THURSDAY NIGHT/FRIDAY. OTHERWISE, THE
GENERAL IDEA OF A TROUGH-RIDGE-TROUGH UPPER-LEVEL LONGWAVE
PATTERN ACROSS THE NORTH AMERICAN CONTINENT LATE NEXT WEEK INTO
NEXT WEEKEND CONTINUES TO BE SUPPORTED AMONGST THE VARIOUS
MEDIUM RANGE ENSEMBLE SUITES. WHILE THERE DOES CONTINUE TO BE
DIFFERENCES IN THE LONGITUDE OF WHERE THESE LONG WAVES WILL SET
UP, THERE IS A GENERAL CONSENSUS THAT CONDITIONS WILL BE
TURNING WARMER AGAIN (ABOVE AVERAGE HIGHS IN THE 70S) INTO NEXT
WEEKEND.
- KJB/IZZI
AVIATION /06Z TAFS THROUGH 12Z MONDAY/
ISSUED AT 621 AM CDT SAT OCT 4 2025
VFR CONDITIONS EXPECTED THROUGH THE 24-30 HOUR TAF PERIOD.
SOUTH-SOUTHWEST WILL INCREASE THIS MORNING AND BECOME GUSTY
BY MID-LATE MORNING THROUGH THE AFTERNOON. PEAK GUSTS SHOULD
TOP OUT BETWEEN 25-30KT. GUSTINESS SHOULD ABATE AS SUNSET
APPROACHES.
- IZZI
FIRE WEATHER
ISSUED AT 242 AM CDT SUN OCT 5 2025
NO CHANGE IN THINKING REGARDING POTENTIAL FIRE WEATHER CONCERNS
THIS AFTERNOON. STRONGER WINDS TODAY WILL COMBINE WITH THE VERY
WARM AND DRY CONDITIONS TO RESULT IN AN ELEVATED FIRE WEATHER
DANGER, PARTICULARLY OVER ILLINOIS. IN ADDITION TO THE STRONGER
WINDS, IT CONTINUES TO LOOK FAVORABLE FOR DEWPOINTS TO MIX OUT
THIS AFTERNOON, RESULTING IN MIN AFTERNOON RH VALUES BETWEEN 20
AND 30 PERCENT.
THE FORECAST STILL LARGELY KEEPS CONDITIONS BELOW RED FLAG
WARNING CRITERIA. HOWEVER, WITH CONDITIONS PROBABLY NEARING
RED FLAG CRITERIA FOR A COUPLE/FEW HOURS THIS AFTERNOON, WILL
REISSUE THE SPS TO ADVERTISE THE HEIGHTENED RISK OF FIELD,
BRUSH, AND GRASS FIRES GETTING OUT OF CONTROL.
- IZZI/KJB
CLIMATE
ISSUED AT 242 AM CDT SUN OCT 5 2025
HIGH TEMPERATURES MAY APPROACH RECORD HIGHS THIS AFTERNOON.
HERE ARE THE CURRENT RECORDS FOR OCTOBER 5TH:
SUNDAY
CHICAGO 88 (1997)
ROCKFORD 90 (1922)
LOT WATCHES/WARNINGS/ADVISORIES
IL...NONE.
IN...NONE.
LM...SMALL CRAFT ADVISORY FROM 11 AM THIS MORNING TO 10 PM CDT THIS
EVENING FOR THE IL NEARSHORE WATERS.
VISIT US AT WEATHER.GOV/CHICAGO
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