407
FXUS63 KMKX 241102 AAA
AFDMKX
AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
602 AM CDT MON AUG 24 2026
KEY MESSAGES
- COMFORTABLE & PLEASANT AFTERNOON WEATHER CONDITIONS TODAY
THROUGH TUESDAY AND THURSDAY-FRIDAY.
- THERE IS A CHANCE FOR SHOWERS & THUNDERSTORMS TUESDAY NIGHT
THROUGH WEDNESDAY AND NEXT WEEKEND.
UPDATE
ISSUED 601 AM CDT MON AUG 24 2026
THERE IS PATCHY GROUND FOG AND RIVER VALLEY FOG IN A FEW
LOCATIONS ACROSS SOUTHERN WI EARLY THIS MORNING. WE CAN EXPECT
DIURNAL CUMULUS CLOUDS TO DEVELOP ONCE AGAIN TODAY, AND ALSO
SOME HIGH CLOUDS WILL START STREAMING IN FROM THE WEST. WINDS
WILL BE LIGHTER THAN YESTERDAY DUE TO HIGH PRESSURE OVERHEAD,
BUT STILL OUT OF THE NORTH- NORTHWEST, WITH THE EXCEPTION OF THE
LAKE BREEZE. LOOK FOR HIGH TEMPERATURES TO BE IN THE UPPER 70S
WHICH IS AROUND NORMAL FOR LATE AUGUST.
CRONCE
SHORT TERM
ISSUED 1232 AM CDT SUN AUG 23 2026
TONIGHT THROUGH MONDAY NIGHT:
WITH HIGH PRESSURE OVERHEAD, SKIES ARE CLEAR AND WINDS ARE
LIGHT. TEMPERATURES IN THE LOW 50S TO LOW 60S ACROSS SOUTHERN
WISCONSIN WILL CONTINUE TO FALL THROUGHOUT THE NIGHT WITH
OVERNIGHT LOWS EXPECTED TO FALL INTO THE UPPER 40S TO MID 50S.
GENERALLY WARMER TEMPERATURES WILL BE ALONG LAKE MICHIGAN. A
NICE CRISP NIGHT AND A TASTE OF FALL FOR THOSE OF US THAT ARE
LOOKING FOR IT. AS TEMPERATURES FALL THERE IS A POTENTIAL FOR
FOG TO DEVELOP TONIGHT BUT THERE IN SOME UNCERTAINTY IN HOW
MUCH FOG WILL DEVELOP. AVAILABLE MOISTURE WILL BE THE ONE
COMPETING FACTOR FOR WHETHER OR NOT FOG DEVELOPS. IF MOISTURE
IS LACKING THEN DEW IS MORE LIKELY TO FORM THAN FOG. STILL A
BIT TO EARLY TO TELL, BUT SHOULD BE SOMETHING THAT SHOWS ITSELF
IN THE NEXT COUPLE OF HOURS OR SO AS THE DEW POINT DEPRESSION
DROPS TO 1-2 DEGREES AT MULTIPLE SITES. ANY FOG THAT DEVELOPS IS
EXPECTED TO BURN OFF/MIX OUT SHORTLY AFTER SUNRISE.
HIGH PRESSURE WILL SLOWLY BEGIN TO SHIFT EAST OF THE STATE,
MONDAY. FAIR WEATHER CUMULUS CLOUDS ARE LIKELY TO DEVELOP AGAIN
THIS AFTERNOON. LIKEWISE UNDER THE LIGHT WINDS, A LAKE BREEZE IS
SHOULD DEVELOP AND A FEW MILES INLAND. QUIET CONDITIONS ARE
EXPECTED THROUGH MONDAY NIGHT. AS WINDS BECOME SOUTHWESTERLY
BEHIND THE DEPARTING HIGH, WAA SHOULD SLOWLY RETURN AHEAD OF THE
NEXT INCOMING SYSTEM FOR TUESDAY.
PATTERSON
LONG TERM
ISSUED 1232 AM CDT SUN AUG 23 2026
TUESDAY THROUGH SUNDAY:
HEADING INTO TUESDAY, HIGH PRESSURE WILL BE MOVING EAST INTO THE MID
ATLANTIC AND NEW ENGLAND STATES AS A LOW PRESSURE SYSTEM TRAVELS
ACROSS SOUTHERN CANADA INTO THE NORTHERN GREAT LAKES REGION. THE
UPPER LEVEL TROUGH IS EXPECTED TO FOLLOW THE EXACT SAME TRACK AS
THIS SYSTEM BECOMES STACKED. THE SURFACE LOW IS EXPECTED TO OCCLUDED
AS IT MOVES EAST BEFORE REACHING THE GREAT LAKES REGION. FOR
SOUTHERN WISCONSIN, THE BEST CHANCE FOR PRECIPITATION IS EXPECTED TO
BE WITH SOME WAA BEHIND THE WARM FRONT AND WITH THE PASSAGE OF A
COLD FRONT. THERE IS SOME UNCERTAINTY ON HOW MUCH IF ANY RAIN/STORMS
WE GET WITH THE PUSH OF WAA AND ANY WE DO GET WILL JUST EAT AWAY AT
ANY INSTABILITY WE WOULD HAVE GAINED IN THE AFTERNOON/EVENING. THE
MAIN CONCERN HERE IS THE LACK OF ANY LOW LEVEL FORCING. AS TEMPS AND
MOISTURE INCREASES DIURNALLY THERE WILL BE INSTABILITY, BUT NOTHING
TO FORCE CONVECTION. WHICH REFLECTS WHY THERE ARE ONLY A FEW MODEL
RUNS WITH ANY AFTER CONVECTION SO LOW CHANCE BUT NON ZERO.
ESPECIALLY IF ONE SHOWER GOES, ITS OUTFLOW COULD TRIGGER MANY
MORE. NOW WITH THE PASSAGE OF THE COLD FRONT THERE IS EXPECTED
TO BE BETTER UPPER LEVEL LIT FROM THE TROUGH, BUT THE TIMING OF
THIS LOOKS TO OCCUR DURING THE OVERNIGHT HOURS INTO WEDNESDAY
LATE MORNING. THIS SEPARATES THE BEST INSTABILITY WITH THE BEST
LIFT AND FORCING. SO WHILE RAIN AND STORMS ARE EXPECTED DUE TO
THIS CONFIDENCE ON ANY STRONG TO SEVERE STORMS ARE LOW. ITS A
LOW BUT NON ZERO CHANCE SITUATION. SHEAR LOOKS TO BE THE ONE
CATEGORY THAT IS PERSISTENT FROM THE WAA TO THE PASSAGE OF THE
COLD FRONT IN SUPPORT OF STRONGER STORMS. IT WILL JUST COME DOWN
TO TIMING AND WHEN OUR BEST FORCING AND INSTABILITY RESIDES.
THE LOW PRESSURE SYSTEM AND FRONT ARE EXPECTED TO CLEAR SOUTHERN
WISCONSIN BY WEDNESDAY AFTERNOON. HIGH PRESSURE IS THEN
EXPECTED TO RETURN TO SOUTHERN WISCONSIN FROM MANITOBA ON
THURSDAY AND FRIDAY. THIS AREA OF HIGH PRESSURE WILL BE EXCITING
TO THE EAST FRIDAY NIGHT AS ANOTHER LOW PRESSURE SYSTEM
APPROACHES FROM THE PLAINS. THIS WILL BRING RAIN CHANCES BACK
FOR THE WEEKEND. AN UPPER LEVEL TROUGH IS EXPECTED TO MOVE
THROUGH CANADA WITH A FEW SHORT WAVE TROUGHS MOVING THROUGH THE
LARGER FLOW ACROSS THE GREAT LAKES REGION. THESE STORMS CHANCES
SEEM TO LARGELY BE DRIVEN BY THE SHORTWAVE ALOFT AND THE LLJ.
WHICH WHEN ALIGNED CAN LEAD TO RAIN AND STORMS, BUT THERE ARE
SOME MESO SCALE FEATURES THAT CAN THROW THAT OFF OR TAKE A DAY
OF STORM POTENTIAL AND TURN IT INTO MOSTLY WITH LITTLE
LIGHTNING. A LOT OF IT WILL COME DOWN TO WHERE THE BEST SHEAR
AND INSTABILITY RESIDE WHICH GLOBAL MODELS SEEM TO BE WASHING
OUT AND SPREADING OUT OVER A GENEROUS PORTION OF THE STATE. THIS
IS THEN REFLECTED IN THE LOW CHANCES AROUND 10-30%. MORE
DETAILS WILL SHAKE OUT AS WE GET CLOSER TO THE WEEKEND.
PATTERSON
AVIATION
ISSUED 601 AM CDT MON AUG 24 2026
THERE IS PATCHY GROUND FOG AND RIVER VALLEY FOG IN A FEW
LOCATIONS ACROSS SOUTHERN WI EARLY THIS MORNING. WE CAN EXPECT
DIURNAL CUMULUS CLOUDS WITH BASES AROUND 6000 FT TO DEVELOP
ONCE AGAIN TODAY, AND ALSO SOME HIGH CLOUDS WILL START STREAMING
IN FROM THE WEST. WINDS WILL BE LIGHTER THAN YESTERDAY DUE TO
HIGH PRESSURE OVERHEAD, BUT STILL OUT OF THE NORTH- NORTHWEST,
WITH THE EXCEPTION OF THE LAKE BREEZE.
CRONCE
MARINE
ISSUED 601 AM CDT SUN AUG 23 2026
LOW PRESSURE IN EASTERN ONTARIO WILL LINGER THROUGH THIS
EVENING, RESULTING IN BREEZY NORTHWEST WINDS ACROSS THE NORTHERN
THIRD OF LAKE MICHIGAN. HIGH PRESSURE WILL DRIFT ACROSS
WISCONSIN AND LAKE MICHIGAN THROUGH TUESDAY AFTERNOON AND WINDS
WILL DIMINISH AND BECOME LIGHT AND VARIABLE. LOOK FOR SOUTH TO
SOUTHWEST WINDS TO DEVELOP OVER THE LAKE TUESDAY AFTERNOON AS
THE HIGH SHIFTS INTO ONTARIO AND LOW PRESSURE APPROACHES FROM
THE NORTHERN GREAT PLAINS TUESDAY NIGHT INTO WEDNESDAY.
THE LOW WILL CROSS LAKE MICHIGAN WEDNESDAY AFTERNOON, BRINGING A
BREEZY NORTHWEST WIND SHIFT, BUT GALES ARE NOT EXPECTED AS THIS
OCCURS. SHOWERS AND THUNDERSTORMS WILL ACCOMPANY THE
APPROACHING/PASSING SURFACE LOW TUESDAY NIGHT INTO WEDNESDAY
AFTERNOON, BUT THEY ARE NOT EXPECTED TO BE SEVERE. THE NEXT AREA
OF HIGH PRESSURE WILL GRADUALLY BUILD TOWARD LAKE MICHIGAN FROM
THE NORTHERN GREAT PLAINS WEDNESDAY NIGHT THROUGH FRIDAY.
CRONCE
MKX WATCHES/WARNINGS/ADVISORIES
WI...NONE.
LM...NONE.
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