581
FXUS63 KAPX 082325
AFDAPX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GAYLORD MI
725 PM EDT THU OCT 8 2026
KEY MESSAGES
- COLD TONIGHT, ESP NEAR AND SOUTH OF M-72
- WARM, BREEZY, DRY SATURDAY; MOST LIKELY WARM/DRY SUNDAY, TOO
DISCUSSION
ISSUED AT 257 PM EDT THU OCT 8 2026
120KT NW UPPER JET FROM WESTERN CANADA DOWN INTO THE MIDWEST AND
AROUND INTO NEW ENGLAND, CIRCLING AROUND A 531DM 500MB UPPER LOW
(AND ATTENDANT 994MB SURFACE LOW) IN THE VICINITY OF JAMES BAY.
CONFLUENCE ZONE ALOFT OVER THE MID-ATLANTIC...WITH HURRICANE
"ISAIAS" SPINNING OVER THE GULF, WHERE THE BULK OF THE DEEP MOISTURE
IS FOCUSED ATTM; ACROSS THE SOUTHERN PLAINS, SOME SEMBLANCE OF UPPER
TROUGHING. UPPER JET IS DRAWING SOME PACIFIC MOISTURE ACROSS WESTERN
CANADA INTO THE NORTHERN PLAINS; RETURN FLOW OVER THE CENTRAL PLAINS
HELPING TO ENHANCE CONVERGENCE ALONG WESTERN EDGE OF A LOW-LEVEL
BAROCLINIC ZONE THERE, WHICH STRETCHES THROUGH THE OH VALLEY INTO
NEW ENGLAND, AROUND THE BASE OF THE TROUGH ALOFT. SOME DRIER AIR
SNEAKING INTO THE UPPER GREAT LAKES ATTM, THOUGH WE DO HAVE SOME LOW-
LEVEL MOISTURE AROUND (PLUS THE WARM WATERS OF THE GREAT
LAKES...STILL AROUND 14-16C ATTM). COOL AIR TO OUR NORTH...0C AT
850MB OVER LAKE SUPERIOR AT 15Z, WITH SOME -8C AIR WELL NORTH OVER
HUDSON BAY ATTM. TEMPS HERE ARE JUST WARM ENOUGH TO GENERATE SOME
OVERLAKE INSTABILITY, ESP FROM APPROXIMATELY M-32 AND NORTHWARD;
AIDED BY SOME PV MAXIMA TRACKING THROUGH THE FLOW, A FEW SHOWERS
OVER PARTS OF THE EUP AND EVEN INTO NE LOWER THIS MORNING, WHICH
SHOULD HOLD ON INTO AT LEAST PART OF THE AFTERNOON.
SUBTLE BIT OF ENERGY CROSSES THE AREA REGION FRIDAY, BUT RIDGING
BUILDS IN GOING INTO FRIDAY NIGHT...AS TROUGHING DIGS INTO THE
WESTERN US...AND ISAIAS TRACKS NORTHWARD OUT OF THE GULF. LOOKING AT
DEVELOPMENT OF A STRONGER SURFACE CYCLONE IN THE NORTHERN PLAINS BY
FRIDAY NIGHT INTO SATURDAY, RESULTING IN STRONG WARM ADVECTION
THROUGH THE UPPER MIDWEST TO START THE WEEKEND...WHICH ASIDE FROM
SUMMER-LIKE TEMPERATURES COULD BRING US A FEW SHOWERS FRIDAY NIGHT
INTO EARLY SATURDAY. CURRENTLY, IT APPEARS TROUGHING WANTS TO CUT
OFF OVER THE WESTERN US...WITH NORTHERN STREAM ENERGY LOOKING MORE
PROGRESSIVE OVER CANADA THIS WEEKEND AS ISAIAS TRACKS NORTHWARD
TOWARD THE OH VALLEY. STILL SOME QUESTIONS ABOUT HOW THESE FEATURES
INTERACT...BUT APPEARS THE BAROCLINIC ZONE FROM THE NORTHERN STREAM
WILL STRETCH OUT TO OUR NORTH, AND WE MAY REMAIN IN A BIT OF A NO-
MAN'S-LAND BETWEEN THIS AND WHAT IS LEFT OF THE TROPICAL SYSTEM FOR
THE FIRST COUPLE DAYS OF NEXT WEEK. INCREASING UNCERTAINTY FOR THE
REMAINDER OF THE PERIOD INTO THE MIDDLE OF NEXT WEEK...DEPENDING ON
HOW QUICKLY RIDGING BUILDS INTO THE MIDWEST (LIKELY DEPENDING ON HOW
STRONG THE TROUGHING OUT WEST ENDS UP) AND HOW THE NORTHERN STREAM
PATTERN EVOLVES (THIS MAY AGAIN DEPEND ON HOW THE TROUGHING OUT WEST
EVOLVES...BUT THERE IS SOME POTENTIAL FOR THE RIDGE TO BUILD QUICK A
BIT NORTHWARD OVER THE MIDWEST BY MIDWEEK NEXT WEEK). THE DOWNSIDE
TO THIS, AS ENERGY TRIES TO EJECT FROM SAID TROUGH...IS THAT THIS
PATTERN COULD CERTAINLY LEAVE THE MIDWEST OPEN TO A PERIOD OF MORE
ACTIVE WEATHER WITH A MORE ACTIVE SW-NE STORM TRACK ACROSS THE
CONUS...THOUGH NOTHING IS SET IN STONE YET, BY ANY MEANS.
FORECAST DETAILS...
COLD TONIGHT...HIGH PRESSURE TO OUR WEST EXPECTED TO BUILD IN
THROUGH THE DAY INTO THE NIGHT TONIGHT, WHICH SHOULD TAMP DOWN WINDS
WITH TIME. COOL AIR MASS IN PLACE SUGGESTS ANOTHER FROSTY/FREEZE-Y
NIGHT FOR THE AREA. THINK THE BEST SHOT OF TEMPS FALLING INTO THE
LOWER 30S OR COLDER WILL BE NEAR AND SOUTH OF M-72, ESPECIALLY AWAY
FROM THE LAKE...THOUGH NOT IMPOSSIBLE IT COULD GET COLDER THAN
FORECAST CLOSER TO MANISTEE/BEULAH IF THE PRESSURE GRADIENT DROPS
OFF FAST ENOUGH TONIGHT. DO WONDER IF UPSTREAM MID/HIGH CLOUDS ON
THE NOSE OF THE JET MAX OVER SOUTHERN CANADA WILL BE ABLE TO LIMIT
RADIATIONAL COOLING. ALSO WONDER IF WE WILL END UP WITH SOME FOG
TONIGHT, GIVEN SOME RECENT RAINFALL, THOUGH WE SHOULD MIX DOWN SOME
DRIER AIR THIS AFTERNOON. NOT SURE THE WIDESPREAD COLD IS A SURE
BET, GIVEN THAT WE SHOULD STILL HAVE SOME OVERLAKE INSTABILITY AND
THOSE AFOREMENTIONED MID/HIGH CLOUDS, PARTICULARLY NEAR AND NORTH OF
M-72/M-32...AND CURRENT TEMP FORECAST REFLECTS THIS IDEA. IF WE
CLEAR OUT AND CALM DOWN QUICKER ACROSS THE TIP OF THE MITT/EUP,
TEMPS WOULD FALL MUCH MORE DRAMATICALLY THAN CURRENTLY FORECAST.
GIVEN MONDAY NIGHT'S COLD (WIDESPREAD TEMPERATURES BELOW 32F FOR
NORTHERN LOWER), WILL CONSIDER THE GROWING SEASON EFFECTIVELY ENDED
(I.E., NO MORE FROST/FREEZE HEADLINES FOR THIS SEASON)...THOUGH
SUPPOSE SOME AREAS NEAR THE LAKE MI COAST WILL REMAIN MORE SENSITIVE
WITH A TRADITIONALLY LONGER GROWING SEASON.
WARMTH THIS WEEKEND...WARM FRONT SHOULD MOVE THROUGH DURING THE
FIRST HALF OF SATURDAY AND RESULT IN MUCH WARMER CONDITIONS GOING
INTO THE AFTERNOON THAN TO START (PLUS WE WILL LIKELY HAVE SOME
CLOUDS/RAIN AROUND EARLY SATURDAY MORNING ALONG/AHEAD OF THE FRONT).
MUCH WARMER AIR MASS ALOFT WILL SUPPORT TEMPERATURES RISING INTO THE
MID AND UPPER 70S; WOULD NOT BE SURPRISED IF SOME AREAS ACROSS NE
LOWER IN PARTICULAR (AND PERHAPS TVC) TOUCHED OR EXCEEDED 80, GIVEN
SOUTH/SOUTHWEST FLOW SHOULD ENHANCE DOWNSLOPING. THESE AREAS WOULD
ALSO BE MOST LIKELY TO SEE DRY CONDITIONS DEVELOP, WITH RHS DROPPING
TO 30 PERCENT OR LESS...AGAIN, THANKS PRIMARILY TO DOWNSLOPING,
THOUGH THE ANTECEDENT DRY AIR MASS SHOULD TAKE A BITE OUT OF THE
INCOMING MOISTURE WITH THE RETURN FLOW. HAVE OPTED TO TREND
DEWPOINTS AND SUBSEQUENTLY, RHS, DOWN FOR SATURDAY...AND WITH BREEZY
CONDITIONS (S/SW WINDS 10-15KTS WITH POTENTIAL FOR GUSTS AS HIGH AS
25-35KTS, ESP LATE IN THE DAY)...THINK FIRE WEATHER CONCERNS ARE A
POSSIBILITY. PARTICULARLY NOTING IT WILL BE A WARM, SUNNY FALL DAY,
OTHERWISE PERFECT FOR LAWN CLEAN-UP...JUST NOT THE BURNING KIND OF
CLEAN-UP.
SUNDAY...EXPECTATIONS ARE FOR THE REMNANTS OF ISAIAS TO TRACK
SOMEWHERE IN THE VICINITY OF KY/TN SUNDAY. THERE ARE SOME SIGNALS
FOR A BAND OF DEFORMATION RAINFALL ON THE NORTHERN EDGE OF ISAIAS'
INFLUENCE...AND IT ISN'T OUT OF THE QUESTION THIS COULD YET SNEAK
INTO OUR SAGINAW BAY REGION/M-55 ON SUNDAY...BUT STILL A LOT OF
UNCERTAINTY REGARDING TIMING/PLACEMENT OF THIS FEATURE, AND MOST
SIGNALS KEEP THIS TO OUR SOUTH, CLOSER TO THE THUMB/CENTRAL LOWER MI
ATTM. SUBSIDENCE AND WARMTH APPEAR TO OVERTAKE MOST OF NORTHERN
MICHIGAN OTHERWISE, THOUGH THINK THE STRONGEST WINDS AND WARMEST
TEMPS COULD REMAIN TO OUR WEST/NORTHWEST CLOSER TO THE TIGHTER
PRESSURE GRADIENT, AS WE COULD REMAIN IN THAT NO-MAN'S-LAND BETWEEN
SYSTEMS. NEXT CHANCE FOR RAIN COULD HOLD OFF TILL LATER MONDAY NIGHT
INTO TUESDAY AS THE UPSTREAM BAROCLINIC ZONE STARTS TO TREND
EASTWARD.
AVIATION /00Z TAFS THROUGH 00Z FRIDAY/
ISSUED AT 724 PM EDT THU OCT 8 2026
MAINLY VFR. SOME SHOWERS NEAR CIU/APN, MAYBE MVFR AT TIMES AT
APN DUE TO VSBYS. MAYBE SOME MVFR FOG OVERNIGHT AT CIU. OTHERWISE
QUIET, A LITTLE CU FRIDAY. DECREASING WINDS INTO TONIGHT AND
FRIDAY.
APX WATCHES/WARNINGS/ADVISORIES
MI...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR LHZ345>349.
SMALL CRAFT ADVISORY UNTIL 8 PM EDT THIS EVENING FOR LMZ323-
341-342.
SMALL CRAFT ADVISORY UNTIL MIDNIGHT EDT TONIGHT FOR LSZ321-322.
DISCUSSION...FEF
AVIATION...JZ
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