597
FXUS63 KILX 102300
AFDILX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LINCOLN IL
600 PM CDT SUN MAY 10 2026
KEY MESSAGES
- CONDITIONS ARE EXPECTED TO BE DRIER THAN NORMAL FOR MID-MAY,
WITH WEEKLY RAINFALL TOTALS LIKELY SUPPRESSED TO
APPROXIMATELY HALF AN INCH.
- A WARMING TREND WILL BRING TEMPERATURES ABOVE SEASONAL
AVERAGES THROUGHOUT THE WEEK, FEATURING DAYTIME HIGHS IN THE
VICINITY OF 80 DEGREES AND OVERNIGHT LOWS NEAR THE UPPER 50S.
- BLOWING DUST CONCERNS ARE INCREASING FOR TUESDAY AND
WEDNESDAY, PARTICULARLY NORTH OF I-70 AND EAST OF THE ILLINOIS
RIVER. WIND GUSTS EXCEEDING 30 MPH ARE LIKELY (50-80%) DURING
THIS TIME. GIVEN RELATIVELY DRY SOILS AND PEAK FARMING
ACTIVITY, VISIBILITY ALONG MAJOR ROADWAYS MAY BECOME NOTABLY
IMPACTED DUE TO BLOWING DUST.
DISCUSSION
ISSUED AT 555 PM CDT SUN MAY 10 2026
(THROUGH NEXT SUNDAY)
ISSUED AT 1217 PM CDT SUN MAY 10 2026
SURFACE HIGH PRESSURE IS CURRENTLY BUILDING TOWARD THE GREAT
LAKES, SITUATED DOWNSTREAM OF AN UPPER-LEVEL RIDGE. THIS SETUP
WILL MAINTAIN COOL AND DRY CONDITIONS ACROSS THE REGION THROUGH
TONIGHT. BASED ON NBM DETERMINISTIC GUIDANCE, OVERNIGHT LOW
TEMPERATURES ARE EXPECTED TO DROP INTO THE LOW 40S.
A NOTABLE PUSH OF LOW-LEVEL WARM ADVECTION FROM THE PLAINS IS
EXPECTED TO MOVE INTO THE MIDWEST ON MONDAY AND TUESDAY, RAISING
TEMPERATURES AND DEWPOINTS AHEAD OF AN APPROACHING FRONTAL
BOUNDARY. ACCORDING TO THE LATEST ENSEMBLE AND MULTI-MODEL DATA,
THERE IS A HIGH PROBABILITY (60-80%) OF RAIN ACROSS THE AREA BY
TUESDAY EVENING. MEAN QPF FROM THE NBM AND GRAND ENSEMBLE
CURRENTLY SUGGESTS LIGHT TOTALS, GENERALLY RANGING FROM A FEW
HUNDREDTHS TO 0.25 INCHES. WHILE THE RISK FOR SEVERE WEATHER IS
LOW, LOCALLY HIGHER RAINFALL AMOUNTS COULD OCCUR IF THE FRONT
INTERACTS WITH ELEVATED INSTABILITY.
THE PRIMARY CONCERN FOR MID-WEEK CENTERS ON THE POTENTIAL FOR
BLOWING DUST. ANALYSIS OF MODEL SOUNDINGS REVEALS DEEP BOUNDARY
LAYER MIXING THAT COULD GENERATE GUSTS EXCEEDING 30 MPH ON BOTH
TUESDAY AND WEDNESDAY. THIS ASSESSMENT IS REINFORCED BY
PROBABILISTIC GUIDANCE FROM THE GEFS, EPS, AND NBM, WHICH
INDICATES A GREATER THAN 50% PROBABILITY OF SUCH GUSTS OCCURRING
EAST OF THE ILLINOIS RIVER AND NORTH OF I-70. THESE STRONG
WINDS ARE EXPECTED TO COINCIDE WITH PEAK FARMING OPERATIONS AND
RELATIVELY DRY SOIL CONDITIONS. GIVEN THAT ANTICIPATED RAINFALL
ON TUESDAY EVENING MAY BE INSUFFICIENT TO SETTLE THE DUST,
SIGNIFICANT VISIBILITY REDUCTIONS ARE POSSIBLE ON REGIONAL
HIGHWAYS. FORECASTERS WILL CONTINUE TO MONITOR THE SITUATION FOR
THE POTENTIAL ISSUANCE OF BLOWING DUST HEADLINES.
DRY WEATHER WILL PERSIST FROM WEDNESDAY INTO EARLY FRIDAY AS
SURFACE HIGH PRESSURE AND AN UPPER-LEVEL RIDGE BECOME
ESTABLISHED OVER THE AREA. AS THIS PATTERN TAKES HOLD, A
TRANSITION TO MUCH WARMER CONDITIONS IS EXPECTED STARTING
THURSDAY, WITH AFTERNOON HIGHS TRENDING TOWARD THE UPPER 80S BY
THE END OF THE WEEK.
MEDIUM-RANGE GUIDANCE SUGGESTS A ROBUST SURGE OF GULF MOISTURE
WILL USHER IN A WARMER, MORE HUMID AIRMASS ACROSS THE MIDWEST
FROM LATE FRIDAY THROUGH SUNDAY. THIS PATTERN SHIFT IS LIKELY TO
INITIATE A PERIOD OF HEIGHTENED CONVECTIVE ACTIVITY, AS
THERMODYNAMIC AND KINEMATIC ENVIRONMENTS POTENTIALLY EVOLVE TO
SUPPORT SEVERE WEATHER. ALONGSIDE THE NOTABLE WARMING TREND,
BREEZY SOUTHERLY WINDS MAY REINTRODUCE BLOWING DUST CONCERNS TO
PORTIONS OF CENTRAL ILLINOIS TOWARD THE END OF THE WEEK.
HOWEVER, THE MAGNITUDE OF THESE VISIBILITY IMPACTS WILL LARGELY
DEPEND ON THE PRECEDING RAINFALL TOTALS OBSERVED DURING THE
LATE-WEEK PERIOD.
AVIATION /00Z TAFS THROUGH 00Z TUESDAY/
ISSUED AT 600 PM CDT SUN MAY 10 2026
HIGH PRESSURE WILL DOMINATE THE WEATHER PATTERN FOR THE UPCOMING
24 HOURS PROMOTING VFR CONDITIONS ACROSS THE CENTRAL IL
TERMINALS. WINDS NNW UP TO 11 KTS AT 00Z WILL RAPIDLY DIMINISH
THIS EVENING, BECOMING LIGHT AND VARIABLE THROUGH THE NIGHT.
WINDS WILL INCREASE FROM THE W-NW MONDAY MORNING, BECOMING NW
8-12 KTS BY 18Z.
ILX WATCHES/WARNINGS/ADVISORIES
NONE.
KEY MESSAGES...MJA
DISCUSSION...MJA
AVIATION...37
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