938
FXUS63 KMKX 212008
AFDMKX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
308 PM CDT TUE APR 21 2026
KEY MESSAGES
- WELL ABOVE NORMAL TEMPS WILL CONTINUE THROUGH FRIDAY WITH THE
EXCEPTION OF NEAR THE LAKE ON WEDNESDAY.
- NEXT CHANCES (60-80%) FOR SHOWERS AND THUNDERSTORMS LATE
THURSDAY NIGHT AND FRIDAY, THEN AGAIN EARLY NEXT WEEK.
SHORT TERM
ISSUED 307 PM CDT TUE APR 21 2026
TONIGHT THROUGH THURSDAY:
THE SHOWERS AND STORMS HAVE SHIFTED TO THE SOUTH AND EAST AS
THE LOW TO MID LEVEL THERMAL RIDGE AND MOISTURE RIDGE MOVES
AWAY. A WEAK AND DECAYING, DRY COLD FRONT WILL THEN PASS FROM
NORTH TO SOUTH ACROSS THE REGION FROM LATE THIS AFTERNOON INTO
THE EVENING. MUCH LATER AT NIGHT, AREAS OF FOG MAY FORM OVER FAR
SRN WI AS THE FRONT STALLS OVER NRN IL.
HIGH PRESSURE OVER ONTARIO AND THE NRN GREAT LAKES WED AM WILL
SHIFT TOWARD THE LOWER GREAT LAKES, WHILE UPPER RIDGING MOVES
INTO THE UPPER MS RIVER VALLEY. ELY WINDS WILL BECOME SSELY WITH
WARM ADVECTION BEGINNING ONCE AGAIN. HIGH TEMPS WILL RANGE FROM
50S AT THE LAKE MI BEACHES TO MIDDLE TO UPPER 70S OVER SOUTH
CENTRAL WI. THE SLY WINDS WILL CONTINUE TO BRING WARM TEMPS INTO
THU AS A N-S SFC TROUGH AND COLD FRONT MOVES EWD ACROSS THE
GREAT PLAINS. HIGH TEMPS WILL BE NEAR 80F.
GEHRING
LONG TERM
ISSUED 307 PM CDT TUE APR 21 2026
THURSDAY NIGHT THROUGH TUESDAY:
FOR LATE THU NT AND FRI A SHORTWAVE TROUGH WILL LIFT FROM THE
CENTRAL GREAT PLAINS INTO WI, WHILE THE COLD FRONT SLOWLY
PASSES. THUS 60-80 PERCENT CHANCES FOR SHOWERS AND SCATTERED
STORMS ARE FORECAST. A WEAK HIGH PRESSURE AREA WILL THEN PASS ON
SAT FOLLOWED BY INCREASING SELY WINDS AND WARM ADVECTION FOR
SUNDAY AHEAD OF CYCLOGENESIS OVER THE CENTRAL GREAT PLAINS.
THE LOW PRESSURE AREA AND ASSOCIATED SHORTWAVE TROUGH IS THEN
EXPECTED TO LIFT NEWD INTO WI ON MON, WITH ANOTHER ROUND (50-60
PERCENT) OF SHOWERS AND STORMS.
GEHRING
AVIATION
ISSUED 307 PM CDT TUE APR 21 2026
VFR CONDITIONS THIS AFTERNOON AND EVENING. AREAS OF BR AND FOG
(VSBYS OF 1SM TO 5SM, LOCALLY LESS POSSIBLE) MAY THEN FORM OVER
FAR SRN WI AS A FRONT STALLS OVER NRN IL EARLY WED AM. THE FOG
AND ANY LOW STRATUS SHOULD THEN BURN OFF BY LATE MORNING WITH
VFR CONDITIONS RETURNING.
GEHRING
MARINE
ISSUED 307 PM CDT TUE APR 21 2026
LIGHT TO MODEST SOUTH WINDS WILL SHIFT TO LIGHT NORTH TO
NORTHEASTERLY TONIGHT, AS A WEAK COLD FRONT PASSES AND HIGH
PRESSURE MOVES ACROSS ONTARIO AND THE NORTHERN GREAT LAKES.
SCATTERED STRONG THUNDERSTORMS WILL AFFECT FAR SOUTHERN LAKE
MICHIGAN THIS AFTERNOON.
THE HIGH OVER THE NORTHERN GREAT LAKES WILL THEN SHIFT TO THE
LOWER GREAT LAKES ON WEDNESDAY. LIGHT NORTHEAST TO EAST WINDS ON
WEDNESDAY WILL THEN BECOME SOUTHEAST WEDNESDAY NIGHT AND INCREASE
THURSDAY INTO FRIDAY, AS STRONG LOW PRESSURE AROUND 29.2 INCHES
DEVELOPS IN THE NORTHERN PLAINS.
A SMALL CRAFT ADVISORY MAY BE NEEDED NORTH OF NORTH POINT
LIGHTHOUSE FROM LATE THURSDAY AFTERNOON INTO FRIDAY MORNING.
GEHRING
MKX WATCHES/WARNINGS/ADVISORIES
WI...NONE.
LM...NONE.
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