162
FXUS63 KMKX 140030
AFDMKX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
730 PM CDT THU AUG 13 2026
KEY MESSAGES
- SHOWER AND STORM ACTIVITY SHOULD REMAIN JUST SOUTH OF THE
STATE BORDER TONIGHT INTO FRIDAY, WITH 20-50% CHANCES FOR A
STRAY CELL TO PUSH INTO FAR SOUTHERN OR SOUTHWEST WI.
- POTENTIAL FOR STORMS TO LIFT INTO SOUTHERN WI FRIDAY NIGHT
INTO SATURDAY MORNING (65-85% CHANCES). STRONG TO SEVERE
STORMS ARE NOT EXPECTED AT THIS TIME.
- DRIER & MORE COMFORTABLE INTO EARLY NEXT WEEK, WITH STORM
CHANCES RETURNING BY MID-WEEK.
UPDATE
ISSUED 730 PM CDT THU AUG 13 2026
CURRENTLY MONITORING THE EAST-WEST LINE OF SHOWERS AND STORMS
DEVELOPING FROM EAST-CENTRAL IA INTO NORTHERN IL. GENERALLY
EXPECTING IT TO HOLD POSITION, AND POTENTIALLY SAG EVEN FURTHER
SOUTHWARD INTO TONIGHT, LEAVING SOUTHERN WI PREDOMINANTLY DRY.
THAT SAID, WE DO HAVE SOME 10-40% CHANCES IN THE FARTHEST SOUTH
TIER OF WI COUNTIES IN CASE IT WERE TO CLIP THE CWA LATER TODAY
INTO TONIGHT.
MULTIPLE LEVELS OF CLOUD COVER ARE CURRENTLY TRACKING ACROSS THE
STATE, SOME AROUND 1,000 FT DRIFTING WESTWARD OFF LAKE MI, SOME
ALTOCUMULUS / ALTOSTRATUS DRIFTING EASTWARD ACROSS THE STATE,
AND PERHAPS FAR SOUTHERN WI WILL OBSERVE SOME ANVIL CLOUDS FROM
THE AFOREMENTIONED STORMS. AS SUCH, DESPITE THE LINGERING
HUMIDITY, FOG DEVELOPMENT IS EXPECTED TO BE LESS WIDESPREAD AND
LESS INTENSE THAN LAST NIGHT. INCLUDING "PATCHY FOG" IN THE
FORECAST FOR MUCH OF THE REGION TONIGHT INTO EARLY FRIDAY
MORNING.
SHEPPARD
SHORT TERM
ISSUED 140 PM CDT THU AUG 13 2026
TONIGHT AND FRIDAY:
RAIN ASSOCIATED WITH THE NORTHERN PORTION OF A LARGE MCS MOVING
THROUGH SOUTHERN WISCONSIN WILL END FROM WEST TO EAST THIS
AFTERNOON INTO THE EARLY EVENING HOURS. THERE'S SOME BRIEF
POTENTIAL FOR LONG FLASH LIGHTNING STRIKES FOR A PERIOD AS AN
AREA OF 30DBZ+ REFLECTIVITY COMES THROUGH AT 0C. ONCE THAT MOVES
THROUGH, THE LIGHTNING AND THUNDERSTORM POTENTIAL SHOULD END.
PAST FEW RUNS OF THE HRRR/RRFS HAVE BEEN HOLDING ONTO SOME
SHOWER DEVELOPMENT BUT ANY DECENT INSTABILITY WILL BE SHUNTED
WELL TO THE SOUTH DUE TO THIS COMPLEX MOVING THROUGH.
GOING LATE TONIGHT INTO FRIDAY, SOME WEAK RIDGING PUSHES IN ON
THE BACK SIDE OF THE MCS AND SHOULD KEEP THINGS DRY FOR MUCH OF
THIS PERIOD. AM EXPECTING SURFACE DEW POINTS TO DROP A BIT IN
THE WAKE OF THE MCS AS WELL, SO WITH UPPER LEVEL CLOUD COVER AND
THE LOWER TDS, AM NOT EXPECTING WIDESPREAD DENSE FOG TO FORM
AGAIN TONIGHT.
HALBACH
LONG TERM
ISSUED 140 PM CDT THU AUG 13 2026
FRIDAY NIGHT THROUGH THURSDAY:
THE NEXT BEST CHANCES FOR STORMS IN A VERY UNCERTAIN PATTERN
COMES ON FRIDAY NIGHT INTO SATURDAY MORNING. 13.12Z GUIDANCE
SHOWS A 500MB TROUGH EJECTING NORTHEASTWARD OUT OF COLORADO AND
PROPAGATING NORTHEAST TO EASTWARD INTO SATURDAY MORNING WITH THE
VORT MAX GOING RIGHT THROUGH SOUTHERN WI. IN THE LOWER LEVELS, A
SURFACE LOW CURRENTLY OVER KANSAS IS EXPECTED TO FOLLOW A
SIMILAR TRACK INTO SOUTHERN WISCONSIN WITH A STRONG PUSH OF
925-850MB MOISTURE TRANSPORT OUT AHEAD OF IT. GUIDANCE SUGGESTS
RAIN MOVING INTO SOUTHWEST WISCONSIN AFTER 7PM FRIDAY NIGHT WITH
THE MOST WIDESPREAD RAIN COMING IN AFTER MIDNIGHT THROUGH
DAYBREAK SATURDAY. FORECAST SOUNDINGS SHOW FAIRLY WARM AIR ALOFT
WITH MINIMAL INSTABILITY TO WORK ON. THEREFORE, AM THINKING THE
SEVERE POTENTIAL IS FAIRLY LOW ON THIS ROUND OF STORMS AND WILL
MORESO BE ANOTHER BENEFICIAL RAINFALL. CAN'T RULE OUT SOME
LIGHTNING FOR THE LATE EVENING FRIDAY AND SATURDAY MORNING FOR
ANY EVENTS AND FARMERS MARKETS OCCURING OVER THIS TIMEFRAME.
SUNDAY IS RATHER QUESTIONABLE AT THE MOMENT FOR WHETHER THERE
WILL BE ANY RAIN AS THE 13.12Z NAM/GFS BOTH PUSH THE BOUNDARY
OUT OF SOUTHERN WISCONSIN IN THE WAKE OF THE SATURDAY LOW WHILE
THE ECMWF IS SLOWER TO BRING IT THROUGH. HAVE SOME SMALL CHANCE
POPS IN THERE TO COVER THE ECMWF SOLUTION.
BEYOND THAT, THE EARLY PORTION OF NEXT WEEK FEATURES A BROAD
RIDGE OF HIGH PRESSURE BEFORE RETURN SOUTHERLY FLOW KICKS BACK
IN. ANOTHER TROUGH LOOKS TO SWING DOWN FROM CANADA AROUND MID-
WEEK WHICH COULD LEAD TO THE NEXT CHANCES FOR RAIN/STORMS.
HALBACH
AVIATION
ISSUED 710 PM CDT THU AUG 13 2026
SHOWER AND STORM ACTIVITY SHOULD REMAIN CONFINED SOUTH OF THE
WI/IL BORDER TONIGHT INTO FRIDAY, WITH ONLY SLIGHT CHANCES FOR
STRAY ACTIVITY TO PUSH INTO SOUTHERN WI TERMINALS (GENERALLY AT
OR BELOW PROB30 LEVELS). SOME POTENTIAL FOR PATCHY FOG TO
REDEVELOP TONIGHT, THOUGH SCT TO BKN CLOUD COVER AT MULTIPLE
LEVELS ALOFT SHOULD MAKE THE FOG LESS PREVALENT THAN LAST NIGHT.
LIGHT AND VARIABLE WINDS THIS EVENING WILL TRANSITION TO A
STEADY EAST TO NORTHEAST BREEZE INTO FRIDAY.
CHANCES FOR SHOWERS AND STORMS GRADUALLY INCREASE FRIDAY NIGHT
INTO SATURDAY, WITH CLOUD CEILINGS DECREASING.
SHEPPARD
MARINE
ISSUED 140 PM CDT THU AUG 13 2026
THE MAIN PERIOD OF WINDY CONDITIONS APPEARS TO BE ON SATURDAY AS
A LOW PRESSURE SYSTEM MOVES IN TOWARD THE SOUTHERN END OF LAKE
MICHIGAN. THE 13.12Z GFS IS THE STRONGEST WITH THESE WINDS WHILE
THE 13.12Z ECMWF SHOWS WEAKER WINDS. AFTER THAT SYSTEM MOVES
THROUGH, WINDS SHOULD BECOME WEAKER AGAIN UNTIL ANOTHER FRONT
DROPS DOWN INTO THE REGION TOWARD THE MIDDLE OF NEXT WEEK.
HALBACH
MKX WATCHES/WARNINGS/ADVISORIES
WI...NONE.
LM...NONE.
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