285
FXUS63 KAPX 241736
AFDAPX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GAYLORD MI
136 PM EDT THU JUL 24 2025
KEY MESSAGES
- HOT AND HUMID TODAY OVER NE LOWER, ESPECIALLY IN GLADWIN, ARENAC,
AND IOSCO COUNTIES
- CHANCES FOR AFTERNOON SHOWERS AND STORMS. THE MAIN HAZARDS WITH
STORMS WILL BE HEAVY RAIN, LIGHTNING, AN DAMAGING WIND GUSTS.
- A BRIEF COOL DOWN BACK INTO THE HIGH 70S AND 80S FRIDAY AND
SATURDAY, THEN HEAT RETURNS SUN AND MON
- ON AND OFF SHOWERS AND STORM CHANCES THROUGH END OF THE MONTH
UPDATE
ISSUED AT 928 AM EDT THU JUL 24 2025
INHERITED FORECAST THEMES REMAIN ON TRACK... A GROTESQUELY HUMID
DAY ACROSS MUCH OF THE NORTHWOODS. CURRENT PEEK AT RADAR AND
SATELLITE SHOWS LOW CLOUD BEGINNING TO WASH OUT ACROSS THE AREA,
WITH AN AREA OF SEMI-ORGANIZED CONVECTION ROCKETING OFF THE DOOR
PENINSULA, MOVING INTO THE OPEN WATERS OF NORTHERN LAKE
MICHIGAN. 12Z SOUNDINGS BETWEEN GRB AND APX SHOWCASES THAT
MOISTURE PROBABLY ONLY GETS DEEPER FOR US... AMPLE SATURATION TO
OUR WEST AT THE GRB SITE HAS YIELDED A 2.06 PWAT, WHILE A LITTLE
BIT OF DRIER AIR ALOFT HAS A LESSER 1.54 PWAT. AS THIS AREA OF
DEEPER MOISTURE ADVECTS EASTWARD, AND DIURNAL HEATING COMMENCES,
WILL EASILY SEE ENOUGH INSTABILITY TO GENERATE THUNDERSTORMS. AT
THIS JUNCTURE, THE BIGGER ISSUE LOOKS TO BE THOSE TORRENTIAL
RAINS... THOUGH WITH ENOUGH SHEAR (0-6KM BULK SHEAR GENERALLY
~40KTS), COULD CERTAINLY SEE A DAMAGING WIND THREAT MATERIALIZE
IN THE MOST ROBUST OF UPDRAFTS. AS IT STANDS NOW, THE MOST
FAVORABLE WINDOW FOR STORMS ACROSS NORTHERN MICHIGAN IS
GENERALLY SOMEWHERE BETWEEN 10 AM AND 5 PM, PERHAPS LINGERING A
LITTLE LATER CLOSER TO LAKE HURON / SAGINAW BAY. IN THESE
SCENARIOS WITH SUCH LOW CLOUD BASES, WILL HAVE TO WATCH HOW
OUTFLOW BOUNDARY GENERATION MATERIALIZES THIS AFTERNOON, AS ANY
HYPER- LOCALIZED SHEAR ENVIRONMENTS COULD THROW A FUNNEL CLOUD
OR TWO IF THESE COLLISIONS ARE ABSOLUTELY PERFECT. VERY LOW
CONFIDENCE IN ANYTHING TORNADIC, BUT CANNOT BE RULED OUT.
IN ADDITION, COMBINATION OF HIGHS IN THE 90S AND SURFACE
DEWPOINTS WELL INTO THE 70S IN THE SAGINAW BAY AREA (WHERE A
HEAT ADVISORY IS IN EFFECT THRU 8 PM THIS EVENING), HEAT INDICES
ARE EXPECTED TO CLIMB IN EXCESS OF 100... WITH 95 TO 100 HEAT
INDICES ACROSS PORTIONS OF OGEMAW AND ALCONA AS WELL.
SHORT TERM /THROUGH TONIGHT/
ISSUED AT 244 AM EDT THU JUL 24 2025
CURRENT SURFACE OBSERVATIONS SHOW MOST WINDS HAVE RETURNS TO
SOUTHERLY OVER NORTHERN MI THIS MORNING AS AN MCS DISSIPATES WITH
THE REMNANTS EXITING TO THE NORTH AND EAST. DEW POINTS IN THE MID TO
HIGH 60S WILL KEEP CLIMBING THIS MORNING INTO THE LOW TO MID 70S AS
THE AXIS OF DEEPEST MOISTURE MOVES OVER MI TODAY. THIS MOISTURE
SURGE HAS BEEN ROTATING AROUND A LARGE DOME OF HIGH PRESSURE WHICH
IS HAS BEEN MEANDERING OVER THE CENTRAL AND EASTERN U.S.
CYCLOGENESIS OVER SOUTH CENTRAL ONTARIO CAN HAS HELPED BETTER DEFINE
A COLD FRONT THAT STRETCHES ACROSS LK SUPERIOR TOWARDS NORTHERN WI
AND SOUTHERN MN. SURFACE HIGH PRESSURE BUILDING INTO MN AND LK
SUPERIOR WILL CONTINUE TO PUSH THE BOUNDARY TO THE SE ACROSS MI
TODAY. HOT AND HUMID CONDITIONS IN THE LOWER LEVELS, PAIRED WITH A
TREND OF DECREASING HEIGHTS ALOFT LEADS TO AN UNSTABLE ENVIRONMENT
(ESPECIALLY FOR LOCATIONS THAT WARM WELL INTO THE 90S) LATER THIS
MORNING AND EARLY AFTERNOON. SHEAR IN THE MID AND LOWER LEVELS IS
MODEST, HOWEVER SLIGHTLY BETTER SHEAR IN THE MID LEVELS EXISTS TODAY
COMPARED TO YESTERDAY - WHICH MEANS DISCRETE STORMS COULD BECOME
ORGANIZED. THE MAIN WINDOW WILL BE THE MID MORNING HOURS TO THE LATE
EVENING HOURS FOR THE BEST CHANCES WITH SEVERE STORMS. THE MAIN
HAZARDS WILL BE HEAVY RAIN, LIGHTNING, AND DAMAGING WIND GUSTS. AS
THE BOUNDARY SLOWLY MOVES ACROSS THE AREA, REPEATED ROUNDS OF HEAVY
RAIN COULD BE SEEN OVER SOME AREAS. IF SEEN, THIS COULD LEAD TO
LOCALIZED FLOODING IN LOW SPOTS AND HILLY TERRAIN.
HOT AND HUMID CONDITIONS WILL BE SEEN TODAY. THE HOTTEST
TEMPERATUERS WILL LIKELY BE IN GLADWIN, ARENAC, AND IOSCO COUNTIES -
AS A MESO-SCALE BOUNDARY FROM THE MCS LAST EVENING FORMED JUST TO
THE NORTH THESE AREAS, LEAVING THEM UNTOUCHED. NE LOWER WILL ALSO
NOT BE IMPACTED BY THE APPROACHING FRONT BEFORE PEAK HEATING. HEAT
INDICES REACHING INTO THE HIGH 90S AND LOW 100S WILL LIKELY BE SEEN
OVER THE COUNTIES ADJACENT TO SAGINAW BAY THIS AFTERNOON. THE ONE
CAVEAT TO THIS IS IF THE BOUNDARY PROGRESSES QUICKER THAN
ANTICIPATED AND CLOUD COVER REACHES THESE SPOTS BEFORE PEAK HEATING.
HOWEVER, WITH THE HUMIDITY CONDITIONS WILL STILL FEEL HOT TODAY
WHETHER HEAT INDICES ARE IN THE LOW 90S OR HIGH 90S.
UNCERTAINTY: THERE IS UNCERTAINTY IN THE EXACT COVERAGE OF STORMS
AND THE TIMING OF THE BOUNDARY TODAY. CAMS DEPICT EITHER MOSTLY
DISCRETE OR MULTI CELL CLUSTERS ALONG THE BOUNDARY BUT KEEP COVERAGE
ISOLATED OR SCATTERED. THE BOUNDARY WILL BE WEAK AND WASHED OUT,
POSSIBLY SLOWING DOWN OVER NORTHERN AS IT BATTLES WITH SOUTHERLIES
TO THE SOUTH. THE LACK OF UNIFORM FORCING WILL LIKELY RESULT IN LESS
COVERAGE, HOWEVER STORM OUTFLOWS COULD SUBSTITUTE FOR THIS.
NONETHELESS, THE BEST INSTABILITY WILL LIKELY LAND OVER NE LOWER -
AS THE BOUNDARY WILL BE ORIENTATED SW/NE - AND LEAD TO THE BEST
CHANCES FOR STORMS HERE.
LONG TERM /FRIDAY THROUGH WEDNESDAY/
ISSUED AT 244 AM EDT THU JUL 24 2025
SURFACE HIGH PRESSURE BUILDS IN FRIDAY, LEADING TO TEMPERATURES
COOLING BY 5 TO 10 DEGREES AND A BRIEF RELIEF FROM THE HUMIDITY. A
SHORTWAVE WILL EJECT FROM THE SOUTHERN PLAINS/ROCKIES TOWARDS THE
GREAT LAKES REGION. SHOWERS AND STORM CHANCES RETURN SATURDAY. BU
SUNDAY, THE DOME OF HIGH PRESSURE HAS MIGRATED BACK TO THE CENTRAL
PLAINS AND RETURNS TEMPERATURES BACK INTO THE HIGH 80S. ROUNDS OF
SHOWERS AND STORMS WILL BE POSSIBLE AS THEY ROTATE AROUND THE UPPER
HIGH AND OVER MI THROUGH MID WEEK.
AVIATION /18Z TAFS THROUGH 18Z FRIDAY/
ISSUED AT 136 PM EDT THU JUL 24 2025
SHOWERS/ STORMS WILL CONTINUE TO TRACK THROUGH THE REGION THIS
AFTERNOON INTO THE EVENING WITH GUSTY WINDS AND HEAVY RAIN
(POSSIBLY REDUCING VISIBILITIES) AT TIMES. WESTERLY WINDS WILL
DECREASE AND TURN NORTHERLY THROUGH THE NIGHT BECOMING CALM/
LIGHT. CHANCES FOR PATCHY FOG DEVELOP INTO THE MORNING HOURS
WITH ANY FOG DEVELOPMENT EXPECTED TO BURN OFF AS THE SUN RISES
IN THE MORNING.
APX WATCHES/WARNINGS/ADVISORIES
MI...HEAT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR MIZ036-041-042.
MARINE...SMALL CRAFT ADVISORY UNTIL 11 PM EDT THIS EVENING FOR LHZ349.
UPDATE...HAD
SHORT TERM...ELD
LONG TERM...ELD
AVIATION...NSC
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