735
FXUS63 KGRB 230413
AFDGRB
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
1113 PM CDT WED JUL 22 2026
UPDATED AVIATION PORTION FOR 06Z TAF ISSUANCE
KEY MESSAGES
- TRANQUIL AND COMFORTABLE WEATHER RETURNS TODAY THROUGH FRIDAY.
- WARMER TEMPERATURES AND HIGHER HUMIDITY RETURN OVER THE WEEKEND,
WITH HIGH TEMPERATURES CLIMBING INTO THE UPPER 80S TO NEAR 90
AND HEAT INDICES REACHING INTO THE 90S.
- PERIODIC CHANCES FOR THUNDERSTORMS RETURN SATURDAY THROUGH
EARLY NEXT WEEK, THOUGH TIMING, COVERAGE, AND SEVERE WEATHER
POTENTIAL REMAIN UNCERTAIN.
DISCUSSION
ISSUED AT 1200 PM CDT WED JUL 22 2026
TODAY THROUGH FRIDAY...
HIGH PRESSURE IN SOUTHERN MN WILL SLIDE SOUTHEAST TODAY AND
GRADUALLY SLIDE EAST ACROSS THE SOUTHERN GREAT LAKES REGION
TONIGHT THROUGH THURSDAY. THE CORE OF THE SURFACE HIGH WILL
SHIFT TO THE NE US BUT THE HIGH PRESSURE WILL EXTEND MUCH
FURTHER WEST ACROSS WI. IN THE UPPER LEVELS WE WILL REMAIN IN
BETWEEN THE RIDGE TO THE WEST AND TROUGH TO THE EAST. WHILE
THERE SHOULD BE SOME ACTIVITY ALOFT WITH VARIOUS SHORTWAVES THE
CONDITIONS WILL BE MUCH TOO DRY FOR ANYTHING TO COME OF THE
UPPER LEVEL FORCING.
THE HIGH PRESSURE WILL FINALLY START TO EXIT FRIDAY WITH LOWER
PRESSURE PUSHING IN FROM THE WEST AS THE RIDGE ALOFT NUDGES
TOWARD THE REGION. NO REAL WEATHER CONCERNS FOR THIS PERIOD AS
WE REMAIN DRY.
FRIDAY NIGHT THROUGH WEDNESDAY...
AS THE RIDGE SLIDES INTO THE REGION THIS WEEKEND EXPECT
TEMPERATURES TO WARM BACK UP WITH A RETURN OF HUMID CONDITIONS,
BUT ALSO A RETURN OF PRECIP/STORM CHANCES. SATURDAY WILL CARRY
MINOR CHANCES ACROSS NORTHERN WI LATE FRIDAY NIGHT INTO THE DAY
SATURDAY WITH A WEAK EMBEDDED SHORTWAVE SLIDING DOWN THE RIDGE.
THERE CURRENTLY LOOKS TO BE ENOUGH MOISTURE AND FORCING TO BRING
SOME PRECIP WITH SOME INSTABILITY IN THE REGION LIKELY ALLOWING
FOR SOME STORMS AS WELL. WHILE TIMING IS NOT EXACTLY GREAT FOR
STRONGER STORMS THERE IS ENOUGH SHEAR PRESENT TO PERHAPS BRING A
FEW STRONGER STORMS SO ITS WORTH MONITORING.
SUNDAY AND MONDAY WILL BE WARMER WITH HIGHS IN THE UPPER 80S TO
LOW 90S WITH MULTIPLE CHANCES FOR STORMS THOUGH THE BEST CHANCE
FOR STRONG TO SEVERE STORMS APPEARS TO BE SUNDAY
AFTERNOON/EVENING WHERE WAA AND A WARM FRONT AS THE PRIMARY
FORCING SHOULD ALLOW FOR HIGH INSTABILITY AND A DECENT LLJ WILL
BRING IN ENOUGH SHEAR TO BRING SOME SEVERE WEATHER CONCERNS.
OTHERWISE INCREASED UNCERTAINTY INTO EARLY NEXT WEEK BUT
EVENTUALLY WE WILL SEE A FRONT PUSH THROUGH AND COOL THE REGION
OFF A TAD BUT SINCE THE RIDGE REMAINS IN PLACE WE SHOULD
CONTINUE TO EXPECT WARM CONDITIONS. LATER NEXT WEEK THE RIDGE
MAY REVERT BACK WEST A BIT AND ALLOW .
IT IS WORTH MENTIONING THAT BEACH HAZARDS STATEMENT MAY BE
NEEDED FOR FRIDAY AS BREEZY ONSHORE WINDS MAY YIELD NEARSHORE
WAVE HEIGHTS FROM 3-5 FEET.
AVIATION
FOR 06Z TAF ISSUANCE
ISSUED AT 1042 PM CDT WED JUL 22 2026
KOSH...CLEAR SKIES AND LIGHT AND VARIABLE WINDS WILL PREVAIL
OVERNIGHT INTO THURSDAY MORNING. FAIR WEATHER CUMULUS CLOUDS
BETWEEN FIVE AND SIX THOUSAND FEET WILL DEVELOP BETWEEN 16-17Z
AND CONTINUE THROUGH THE AFTERNOON. A PREVAILING SOUTHWEST WIND
OF 5 TO 10 KNOTS IS EXPECTED THROUGHOUT MOST OF THE DAY. WINDS
SHOULD BACK TO THE SOUTH LATE IN THE DAY INTO THE EVENING WITH
CLEARING SKIES.
REST OF NORTH-CENTRAL AND NORTHEAST WI, CLEAR SKIES AND LIGHT
AND VARIABLE WINDS WILL CONTINUE INTO THURSDAY MORNING. FAIR
WEATHER CUMULUS CLOUDS BETWEEN FOUR AND SIX THOUSAND FEET IS
EXPECTED TO DEVELOP BETWEEN 15-17Z AND CONTINUE THROUGHOUT THE
AFTERNOON. SOUTHWEST WINDS OF 5 TO 10 KNOTS ARE FORECASTED WITH
WINDS BACKING TO THE SOUTH DURING THE LATE AFTERNOON AND
EVENING. THE ONLY EXCEPTION WILL BE ALONG THE LAKE MICHIGAN
SHORELINE WHERE WINDS SHOULD BACK SOUTH/SOUTHEAST BY OR AROUND
18Z. SKIES WILL CLEAR DURING THE EVENING.
MARINE
ISSUED AT 1200 PM CDT WED JUL 22 2026
LIGHTER WINDS AND LOWER WAVES HAVE RETURNED TO OUR MARINE ZONES
AS HIGHER PRESSURE HAS NUDGED INTO THE REGION BEHIND THE
DEPARTED LOW PRESSURE SYSTEM. WINDS WILL REMAIN LIGHT IN THE
WATERS FOR MUCH OF THE NEXT COUPLE DAYS THOUGH THERE WILL BE A
BRIEF PERIOD OF HIGHER WINDS ON THE NORTHEAST SIDE OF LAKE
MICHIGAN WHICH MAY ALLOW FOR A COUPLE HOURS OF SMALL CRAFT
THRESHOLDS OVER THE AREA. HOWEVER, THERE IS A BETTER CHANCE INTO
FRIDAY AFTERNOON AS LOWER PRESSURE BEGINS TO IMPINGE ON THE HIGH
PRESSURE THAT WILL INCREASE THE PRESSURE GRADIENT OVER THE NORTH
LAKE AND THUS A LONGER PERIOD (6-12HRS) OF SMALL CRAFT
CONDITIONS ARE EXPECTED AT THIS.
GRB WATCHES/WARNINGS/ADVISORIES
NONE.
DISCUSSION.....AK
AVIATION.......ECKBERG
MARINE.........AK
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