106
FXUS63 KARX 070530
AFDARX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LA CROSSE WI
1230 AM CDT SUN SEP 7 2025
KEY MESSAGES
- SCATTERED SHOWERS THIS AFTERNOON (30-40% CHANCE), ESPECIALLY
NORTH OF I-90, THAT DIMINISH IN THE EVENING.
- UNSEASONABLY COOL WEATHER STICKS AROUND FOR THE REST OF THE
WEEKEND BEFORE TEMPERATURES CLIMB BACK TO NEAR NORMAL BY THE
MIDDLE OF NEXT WEEK.
- MAIN SHOT OF RAIN FOR THE UPCOMING WEEK LOOKS TO BE LATE
MONDAY THROUGH TUESDAY (40-70% CHANCE), THOUGH A FEW SHOWERS
COULD LINGER OFF AND ON THROUGH THE WEEK.
DISCUSSION
ISSUED AT 1240 PM CDT SAT SEP 6 2025
THIS AFTERNOON/EVENING: COOL WITH SCATTERED SHOWERS
A LARGE CYCLONIC BOWLING BALL OF ARCTIC AIR REMAINS ENTRENCHED
ACROSS THE CENTRAL U.S. TODAY WITH AN EMBEDDED SHORTWAVE TROUGH
DRIVING SOUTHWARD THROUGH NORTHERN MINNESOTA SERVING AS THE
FOCUS FOR SCATTERED SHOWERS LATER THIS AFTERNOON. GIVEN THE
DYNAMIC NATURE OF THE FORCING AND COOLING OF THE MID-TROPOSPHERE
WITH THIS WAVE, SHOWERS MAY LINGER FOR A FEW HOURS PAST SUNSET,
BUT THE RAPID LOSS OF DAYTIME HEATING SHOULD END THE SHOWER
RISK BY 9-10PM. CAN'T FULLY RULE OUT A RUMBLE OF THUNDER WITH
THIS AFTERNOON'S SHALLOW CONVECTION (10-20 PERCENT CHANCE) WITH
RAP/HRRR SOUNDINGS HINTING AT THE EQUILIBRIUM LEVEL HEIGHT
INCREASING PAST THE -10 C LEVEL. A FEW LIGHTNING STRIKES HAVE
ALREADY BEEN NOTED NORTH OF THE TWIN CITIES TO VERIFY THIS
THINKING.
COOL WEEKEND, WARMING UP NEXT WEEK
ONE LAST COLD NIGHT REMAINS ON THE DOCKET FOR TONIGHT BEFORE
SURFACE HIGH PRESSURE PASSES OFF TO THE EAST AND WARM AIR
ADVECTION SETS IN. LOWER TROPOSPHERIC TEMPERATURES INCREASE FROM
+2 TO +15 C BETWEEN THIS AFTERNOON AND MONDAY EVENING. AT THE
SURFACE, THIS WILL RESULT IN DAYTIME HIGH TEMPERATURES STEADILY
INCREASING FROM THE LOW 60S TODAY TO THE MID-70S BY TUESDAY.
FURTHER WARMING OF THE 925-700-MB LAYER DURING THE REMAINDER OF
THE WEEK WILL BE OFFSET BY COOL NORTHEAST TO SOUTHEASTERLY FLOW
OFF AN EASTERN GREAT LAKES HIGH PRESSURE CELL THAT BUILDS
SOUTHWARD DURING THIS PERIOD. PLEASANT HIGHS IN THE 70S LOOK TO
HANG TIGHT FOR THE SECOND HALF OF THE WEEK AND INTO NEXT
WEEKEND.
NEXT ROUND OF SHOWERS EARLY NEXT WEEK
THE INCREASING POSITIVE THETA-E ADVECTION WILL RESULT IN AN
INCREASING RISK FOR SHOWERS AND THUNDERSTORMS BETWEEN MONDAY
AFTERNOON AND LATE TUESDAY. OVERALL IMPACTS AND SEVERITY LOOK
LOW AT THE PRESENT TIME WITH THE MAIN INSTABILITY AXIS FURTHER
TO THE WEST. THE EXACT COVERAGE AND PLACEMENT OF THE SHOWERS
WILL BE HAMMERED OUT AS WE GET CLOSER TO THE TIME PERIOD.
PERIODIC BOUTS OF WARM AIR ADVECTION MAY BE ENOUGH TO GENERATE A
FEW SHOWERS THROUGHOUT THE REST OF THE WEEK, BUT CONFIDENCE IN
ANY DETAILS IS LOW AT THE PRESENT TIME.
AVIATION /06Z TAFS THROUGH 06Z MONDAY/
ISSUED AT 1230 AM CDT SUN SEP 7 2025
MONITORING FOG AND/OR LOW STRATUS POTENTIAL EARLY THIS MORNING
AS T/TD DEPRESSIONS CURRENTLY RANGE FROM 0-2 DEGREES WITH
LARGELY CALM WINDS. STRONGER 15-20 KT WINDS JUST OFF THE SURFACE
ARE THE MAIN LIMITING FACTOR TO FOG DEVELOPMENT, BUT ALREADY
SEEING SOME POCKETS OF FOG REPORTED IN PARTS OF MN/IA. THINKING
RST AND LSE SHOULD REMAIN VFR, BUT CANNOT RULE OUT PATCHES OF
FOG OR SCATTERED LOW STRATUS THROUGH DAYBREAK.
OTHERWISE VFR CONDITIONS DURING THE DAY WITH LIGHT NORTHWESTERLY
WINDS BECOMING SOUTHERLY THIS EVENING. SOME FAIR WEATHER CUMULUS
THIS AFTERNOON.
ARX WATCHES/WARNINGS/ADVISORIES
WI...NONE.
MN...NONE.
IA...NONE.
DISCUSSION...SKOW
AVIATION...KURZ
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