641
FXUS63 KARX 291728
AFDARX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LA CROSSE WI
1228 PM CDT WED JUL 29 2026
KEY MESSAGES
- POTENTIAL IMPACTS FROM WILDFIRE SMOKE PRIMARILY WEST OF THE
MISSISSIPPI RIVER INITIALLY THIS EVENING AND OVERNIGHT.
- PRECIPITATION CHANCES INCREASE THROUGH FRIDAY FROM WEST TO
EAST WITH LOCAL CONFIDENCE DECREASING IN HIGHER RAINFALL
AMOUNTS (1"+) AND STRONG STORMS (<5%).
DISCUSSION
ISSUED AT 1231 AM CDT WED JUL 29 2026
POTENTIAL NEAR SURFACE SMOKE IMPACTS INTO THURSDAY:
A STOUT AREA OF ANTICYCLONIC FLOW OVER THE UPPER MISSISSIPPI
RIVER VALLEY WILL CAUSE A MOSTLY PERSISTENT FORECAST UNTIL
FRIDAY WHEN PRECIPITATION CHANCES INCREASE FROM WEST TO EAST.
MAIN IMPACT CONCERN THROUGH MIDWEEK WILL BE POTENTIAL NEAR
SURFACE SMOKE CAUSING POOR AIR QUALITY. TUESDAY SATELLITE
IMAGERY EXHIBITED THE OFF- SURFACE INCREASED VERTICALLY
INTEGRATED SMOKE OVER AND UPSTREAM OF THE FORECAST AREA WITH THE
ANTICYCLONIC FLOW EXPECTED TO SINK PARTICULATES TO THE SURFACE
WEDNESDAY EVENING INTO THE NIGHTTIME HOURS (HRRR 28.18Z).
LOCATION OF HIGH PRESSURE IN RELATION TO THE LOCAL FORECAST AREA
WILL DETERMINE EXTENT OF LOCAL IMPACTS WITH CURRENT CONFIDENCE
FOR HIGHEST IMPACTS PRIMARILY WEST OF THE MISSISSIPPI RIVER
VALLEY.
PRECIPITATION CHANCES FRIDAY INTO SATURDAY:
A DEEPENING EXTRATROPICAL CYCLONE WILL SLIDE EAST-SOUTHEAST
THROUGH THE NORTHERN TO CENTRAL PLAINS THURSDAY NIGHT THROUGH
FRIDAY, BRINGING PRECIPITATION CHANCES ACROSS THE UPPER MIDWEST
AS IT PASSES. CURRENT CONFIDENCE IN THE LOW'S PROGRESSION
JOGGING SOUTH AS IT APPROACHES THE UPPER MISSISSIPPI RIVER
VALLEY ABATES HIGHER CONFIDENCE FOR HIGHER PRECIPITATION
PROBABILITIES AND UNSTABLE AIR WEST AND SOUTH OF THE LOCAL
FORECAST AREA. ALTHOUGH, WITHOUT THIS SOUTHERN SHUNT, LOCALLY
INCREASED RAINFALL AMOUNTS AND INSTABILITY IS POSSIBLE. WHILE
OUTLYING, SELECT EPS MEMBERS SUGGESTS 3"+ QPF IN SELECT LOCAL
AREAS WITH A MORE NORTHERN, MOIST SOLUTION.
CURRENT LONG TERM GLOBAL ENSEMBLE CONFIDENCE KEEPS THE NEAR
NORMAL LOW LEVEL TEMPERATURES OVER THE FORECAST AREA UNTIL EARLY
NEXT WEEK WHEN LOW LEVEL THETA E ADVECTION RAMPS UP.
AVIATION /18Z TAFS THROUGH 18Z THURSDAY/
ISSUED AT 1229 PM CDT WED JUL 29 2026
HIGH CLOUDS FROM CONVECTION OVER THE HIGH PLAINS WILL MOVE INTO
THE AREA OVERNIGHT AND LINGER ACROSS THE AREA ON THURSDAY
MORNING. WITH LIGHT WINDS OVERNIGHT AND CLIMATOLOGY, WOULD
EXPECT SOME DENSE VALLEY FOG DEVELOP IN IN THE WISCONSIN AND
LOWER KICKAPOO RIVER VALLEYS.
ARX WATCHES/WARNINGS/ADVISORIES
WI...NONE.
MN...NONE.
IA...NONE.
DISCUSSION...JAR
AVIATION...BOYNE
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