448  
FXUS63 KMPX 070807 CCA  
AFDMPX  
 
AREA FORECAST DISCUSSION...CORRECTED  
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN  
307 AM CDT SUN SEP 7 2025  
   
KEY MESSAGES  
 
- INSTANCES OF PATCHY DENSE FOG AND PATCHY FROST ARE POSSIBLE  
THROUGH DAYBREAK.  
 
- ACTIVE WEATHER RETURNS MONDAY & TUESDAY, WITH A COUPLE ROUNDS OF  
SHOWERS AND THUNDERSTORMS POSSIBLE.  
 
- TEMPERATURES WARM BACK INTO THE 70S FOR THE UPCOMING WORK WEEK.  
 
 
   
DISCUSSION  
 
ISSUED AT 258 AM CDT SUN SEP 7 2025  
 
IT'S A COOL AND CALM START TO SUNDAY ACROSS THE FORECAST AREA.  
EXPANSIVE SURFACE HIGH PRESSURE HAS BECOME THE DOMINANT WEATHER  
FEATURE OVER THE UPPER MIDWEST, AS FORCING ASSOCIATED WITH UPPER-  
LOW OVER HUDSON BAY DEPARTS TO THE EAST. GOES GEOCOLOR IMAGERY  
REVEALS MOSTLY CLEAR SKIES AND SURFACE OBSERVATIONS DISPLAY 2 AM  
TEMPERATURES IN THE MID 40S ACROSS MUCH OF THE REGION. WE'RE  
LOOKING AT A FEW EVOLVING PIECES TO THE FORECAST THROUGH DAYBREAK.  
THE FIRST REVOLVES AROUND ISOLATED POCKETS OF PATCHY DENSE FOG  
THAT HAVE DEVELOPED OVER THE PAST FEW HOURS. SURFACE DEW POINTS  
HAVE REMAINED IN THE LOW TO MID 40S (LIKELY DUE TO SATURDAY'S RAIN  
SHOWERS), SO THERE ARE SPOTS WHERE TEMPERATURES HAVE QUICKLY  
COOLED TO THE DEW POINT. THE OTHER PIECE TO THE FORECAST IS THE  
POTENTIAL FOR PATCHY FROST. AS MENTIONED, SLIGHTLY WARMER DEW  
POINTS HAVE PERHAPS PROMOTED THE POTENTIAL FOR FOG, BUT AT THE  
SAME TIME WILL LIKELY PLAY A ROLE IN LIMITING WIDESPREAD FROST  
POTENTIAL. THE BEST CHANCE FOR PATCHY FROST WILL BE ACROSS CENTRAL  
MN (NORTH OF I-94), WHERE TEMPERATURES ARE FORECAST TO DIP INTO  
THE MID 30S. LARGE SCALE SUBSIDENCE WILL SUPPORT A QUIET FORECAST  
TO CLOSE THE WEEKEND. SOUNDINGS FEATURE THE DEVELOPMENT OF DIURNAL  
CU MID TO LATE MORNING, SO WE'LL CALL IT A MOSTLY SUNNY SUNDAY  
WITH LIGHT WINDS AND HIGHS IN THE MID 60S.  
 
SURFACE HIGH PRESSURE SHIFTS SOUTHEAST OVER THE OHIO VALLEY HEADING  
INTO MONDAY. WINDS TAKE ON A SOUTHERLY DIRECTION TONIGHT INTO  
MONDAY, OWING TO RETURN FLOW ON THE WESTERN EXTENT OF THE SURFACE  
HIGH. MOISTURE ADVECTION WILL INCREASE IN RESPONSE TO THE SOUTHERLY  
WIND SHIFT AND WILL BE FURTHER SUPPORTED BY AN INCOMING SHORTWAVE  
OVER THE CENTRAL PLAINS. WE MAY SEE A BATCH OF SHOWERS EARLY MONDAY  
WITHIN THE WING OF WARM ADVECTION, HOWEVER THE BETTER POTENTIAL FOR  
RAIN AND STORMS COMES LATER IN THE DAY. THE LARGE SCALE EVOLUTION OF  
RAIN/STORM CHANCES WILL BE TIED TO A 30+ KT LOW-LEVEL JET, WHICH IS  
FORECAST TO EXTEND ACROSS THE EASTERN PLAINS INTO WEST CENTRAL WI.  
PREVIOUS FORECAST CYCLES HAD FAVORED CONVECTION ACROSS SOUTHEASTERN  
MN, HOWEVER, THE LATEST NBM HAS SHIFTED THE AXIS OF 60+ POPS A BIT  
FARTHER TO THE NORTH (TC METRO TO DULUTH). NEW HI-RES SOLUTIONS FROM  
THE RRFS-A AND THE HRRR DEVELOP SHOWERS/STORMS ON THE NOSE OF THE  
JET AXIS/ALONG A SURFACE WARM FRONT, WHICH MATCHES THE TRENDS IN THE  
NBM POPS. FORECAST GUIDANCE SHOWS AN AXIS OF STRONG INSTABILITY  
ACROSS THE DAKOTAS INTO FAR WESTERN MN, HOWEVER THAT AXIS IS  
DISPLACED FROM THE LOW-LEVEL JET FORCING TO THE EAST. STILL,  
GUIDANCE SUGGESTS 500-1000 J/KG OF CAPE NEAR THE ZONE FAVORED  
FOR CONVECTION, WHICH WILL COMBINE WITH STEEPENING LAPSE RATES  
AND FAVORABLE SHEAR TO SUPPORT THUNDERSTORMS. SPEAKING OF SHEAR,  
A LOOK AT FORECAST HODOGRAPHS REVEALS CURVATURE INDICATIVE OF  
DEEP LAYER SHEAR SUPPORTIVE OF A FEW STRONGER STORMS. GIVEN THE  
MEAGER INSTABILITY, WOULD TEND TO LEAN IN THE DIRECTION OF AN  
ELEVATED HAIL THREAT AS THE CEILING FOR THIS EVENT. CSU'S MLP  
ADVERTISES LOW PROBS FOR HAIL AND WIND ACROSS THE FORECAST AREA.  
THE OVERALL SEVERE WEATHER THREAT IS LOW, BUT REMAINS SOMETHING  
TO WATCH. COVERAGE OF SHOWERS/STORMS WILL FURTHER INCREASE AS  
THE LOW-LEVEL JET INTENSIFIES INTO MONDAY NIGHT (STILL, THE BEST  
CHANCES FOR PRECIPITATION ARE ACROSS EASTERN MN/WESTERN WI).  
 
SCATTERED SHOWERS/STORMS MAY STILL BE ONGOING TUESDAY MORNING. A COLD  
FRONT WILL MOVE FROM NORTHWEST TO SOUTHEAST THROUGH THE REGION  
TUESDAY AFTERNOON AND EVENING. AS PREVIOUSLY DISCUSSED, GUIDANCE HAS  
HAD A TENDENCY TO RUN DRIER WITH THIS FRONTAL PASSAGE AND AS SUCH  
WE ONLY HAVE SLIGHT CHANCE POPS FROM THE NBM (15-20%) IN THE GRIDS  
TUESDAY AFTERNOON. HOWEVER, SUSPECT THAT THE FRONTAL INTERACTION  
WITH A POOL OF LINGERING MOISTURE/HIGHER THETA-E AIR ACROSS SOUTHERN  
MN MAY EVENTUALLY RESULT IN HIGHER POPS FOR THE SECOND HALF OF  
TUESDAY. WILL WAIT FOR MORE OF THE HI-RES GUIDANCE TO ARRIVE FOR A  
DEEPER DIVE, BUT THE INITIAL FEELING IS THAT THE SEVERE WEATHER  
THREAT WOULD BE LOW AND LIKELY ALONG THE LINES OF AN ELEVATED  
HAILER SETUP.  
 
THE FORECAST WILL DRY OUT FOR THE REMAINDER OF THE WORK WEEK. UPPER-  
LEVEL RIDGING WILL SUPPORT THE CONTINUATION OF WARMER TEMPERATURES,  
IN THE UPPER 70S TO LOWER 80S THROUGH THE END OF THE WEEK. ATTENTION  
WILL TURN BACK TO THE WEST HEADING INTO THE UPCOMING WEEKEND, AS  
WESTERN TROUGHING WILL BRING THE RETURN OF WET WEATHER ACROSS THE  
NORTHERN CONUS. SOLUTIONS DIVERGE WHEN IT COMES TO HOW SOON RAIN  
CHANCES WILL RETURN TO OUR PORTION OF THE UPPER MIDWEST, SO AT  
THIS TIME I LIKE THE NBM'S ISOLATED (~20-30%) POPS FOR THE  
UPCOMING WEEKEND.  
 
 
   
AVIATION /06Z TAFS THROUGH 06Z MONDAY/  
 
ISSUED AT 1218 AM CDT SUN SEP 7 2025  
 
MAIN AVIATION CONCERN THIS MORNING IS RECENT DEVELOPMENT OF  
VERY ISOLATED POCKETS OF DENSE FOG. GIVEN THE CLEAR SKIES AND  
LIGHT WINDS, WOULD SUSPECT THAT MORE FOG MAY DEVELOP THROUGH  
DAYBREAK. HOWEVER, CONFIDENCE IS LOW IN IMPACTS TO ANY OF THE  
TERMINALS, SO HAVE OPTED TO LEAVE VISIBILITY REDUCTIONS OUT OF  
THE 06Z TAFS. WILL MONITOR TRENDS AND AMD AS NECESSARY THROUGH  
THE NIGHT. OTHERWISE, EXPECT A CU FIELD AROUND ~5K FEET FROM  
MID-MORNING THROUGH THE AFTERNOON. WESTERLY WINDS SUSTAIN 5-10  
KTS THROUGH THE DAY.  
 
KMSP...NO ADDITIONAL CONCERNS.  
 
/OUTLOOK FOR KMSP/  
MON...VFR. CHC -TSRA/MVFR LATE. WIND S 10-15G20 KTS.  
TUE...VFR. CHC -TSRA/MVFR EARLY. WIND SW 5-10 KTS.  
WED...VFR. WIND E 5-10 KTS.  
 
 
   
MPX WATCHES/WARNINGS/ADVISORIES  
 
MN...NONE.  
WI...NONE.  
 
 
 
 
 
DISCUSSION...STRUS  
AVIATION...STRUS  
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