727
FXUS63 KMKX 212212
AFDMKX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
512 PM CDT TUE APR 21 2026
KEY MESSAGES
- AREAS OF FOG POSSIBLE TONIGHT, PARTICULARLY ACROSS THE
SOUTHERN HALF OF THE AREA.
- 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.
UPDATE
ISSUED 515 PM CDT TUE APR 21 2026
CURRENTLY CENTERED NEAR INTERNATIONAL FALLS, MN, HIGH PRESSURE
WILL CONTINUE TO WORK EAST ACROSS LAKE SUPERIOR THIS EVENING AND
TONIGHT. THE PASSING HIGH WILL ENCOURAGE MOSTLY CLEAR SKIES AND
LIGHT/VARIABLE SURFACE WINDS THROUGH THE OVERNIGHT HOURS
TONIGHT, WITH SUFFICIENT LOW LEVEL MOISTURE IN PLACE TO SUPPORT
SOME AREAS OF FOG THROUGH THE PREDAWN HOURS. CURRENTLY
ANTICIPATING THE BEST FOG POTENTIAL TO RESIDE OVER THE SOUTHERN
HALF OF THE AREA, WHERE LOW LEVEL MOISTURE ADVECTION HAS
CONTINUED THROUGH THIS AFTERNOON & AN ENCROACHING SURFACE
BOUNDARY WILL PROMOTE LIGHT TO EVEN CALM WINDS. HAVE CONTINUED
MENTIONS IN THE WEATHER GRIDS OVER THIS PART OF THE AREA.
WHETHER OR NOT ANY FOG WILL BECOME DENSE REMAINS UNCERTAIN, WITH
TRENDS BEING MONITORED THROUGH THE OVERNIGHT PERIOD.
QUIGLEY
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 515 PM CDT TUE APR 21 2026
PRIMARILY VFR FLIGHT CATEGORIES PREVAIL THROUGH THE PERIOD AS HIGH
PRESSURE CURRENTLY CENTERED NEAR LAKE SUPERIOR MIGRATES EAST TOWARD
LAKE HURON. THE PASSING HIGH WILL LEAD TO MOSTLY CLEAR SKIES THROUGH
WEDNESDAY MORNING, WITH FEW-SCT UPPER LEVEL CLOUDS GRADUALLY MOVING
IN ON WEDNESDAY AFTERNOON. THE CLEAR SKIES WILL COMBINE WITH LIGHT &
VARIABLE WINDS TONIGHT TO SUPPORT AREAS OF FOG, PARTICULARLY ACROSS
THE SOUTHERN HALF OF THE REGION. HAVE INSERTED PREVAILING MENTIONS
IN THE 00Z UPDATE AT ALL TERMINALS ALONG AND SOUTH OF I-94, AND WILL
CONTINUE TO MONITOR TRENDS FURTHER NORTH. WHETHER OR NOT DENSE FOG
WILL OCCUR REMAINS UNCERTAIN, WITH TRENDS BEING MONITORED THROUGH
THE EVENING AND OVERNIGHT HOURS. ANY AREAS OF BR/FG SHOULD QUICKLY
DISSIPATE FOLLOWING SUNRISE WEDNESDAY MORNING. LIGHT AND VARIABLE
WINDS WILL TREND EAST-SOUTHEASTERLY DURING THE DAY WEDNESDAY.
QUIGLEY
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.
VISIT US AT WEATHER.GOV/MILWAUKEE
FOLLOW US ON FACEBOOK, X, AND YOUTUBE AT:
WWW.FACEBOOK.COM/NWSMILWAUKEE
WWW.X.COM/NWSMILWAUKEE
WWW.YOUTUBE.COM/NWSMILWAUKEE
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page