474
FXUS63 KARX 162017
AFDARX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LA CROSSE WI
217 PM CST SAT NOV 16 2024
KEY MESSAGES
- WINDY WITH SCATTERED SHOWERS AND ISOLATED STORMS TONIGHT.
- ANOMALOUS RAINFALL STILL LOOKING LIKELY FROM MONDAY INTO
TUESDAY. RAINFALL TOTALS IN THE EXCESS OF 1 INCH.
- MAYBE SOME LIGHT SNOW FROM WEDNESDAY INTO THURSDAY. AT THIS
TIME, IT LOOKS TO BE A DUSTING AT MOST.
DISCUSSION
ISSUED AT 216 PM CST SAT NOV 16 2024
FOR TONIGHT, A COLD FRONT WILL MOVE EAST THROUGH THE REGION.
THE DEW POINTS WILL GRADUALLY INCREASE INTO THE MID- AND UPPER
40S ALONG THE FRONT MOVES ACROSS THE UPPER MISSISSIPPI RIVER
VALLEY. AS TEMPERATURES COOL ALOFT THIS EVENING ABOVE A COOL AND
STABLE BOUNDARY LAYER TONIGHT, THIS WILL RESULT IN WEAK,
ELEVATED INSTABILITY ABOVE 700 MB. THE COMBINATION OF WARM
ADVECTION ALONG WITH MID- LEVEL ASCENT PRECEDING THE SHORTWAVE
TROUGH WILL RESULT IN THE POTENTIAL FOR ISOLATED THUNDERSTORMS
THIS EVENING. THE MAIN THREATS WITH THESE STORMS WILL BE
LIGHTNING AND GUSTY WINDS. RAIN TOTALS WILL RANGE FROM A TRACE
TO TENTH OF AN INCH. WINDS WILL GUST INTO THE 25 TO 40 MPH RANGE
WITH THE HIGHEST VALUES MAINLY WEST OF THE MISSISSIPPI RIVER
VALLEY THIS EVENING AHEAD OF THE FRONT.
FROM MONDAY INTO TUESDAY, A SHORTWAVE TROUGH AND DEEPENING
SURFACE LOW WILL MOVE NORTH NORTHEAST OUT OF THE CENTRAL PLAINS
INTO THE NORTHERN PLAINS AND UPPER MISSISSIPPI RIVER VALLEY.
STRONG 850 MB MOISTURE TRANSPORT WILL CAUSE THE NAEFS
PRECIPITABLE WATER VALUES TO CLIMB INTO THE 1 TO 1.25 INCH RANGE
DURING THE AFTERNOON AND EVENING. THIS IS 2 TO 3 STANDARD
DEVIATIONS ABOVE NORMAL. EFI CONTINUE TO SHOW ANOMALOUS
PRECIPITATION WHEN COMPARED TO THE CLIMATOLOGY WITH THE SHIFT
OF TAILS 1 TO 2 OVER WESTERN MINNESOTA AND EASTERN DAKOTAS. THE
ECMWF, CANADIAN, AND GEFS ENSEMBLES CONTINUE TO SHOW HIGH
PROBABILITIES (40-80%) FOR GREATER THAN 1" OF RAINFALL FOR THE
FORECAST AREA. WHILE MUCH OF THE AREA WILL LIKELY GET INTO THE
WARM SECTOR OF THIS SYSTEM, THERE IS STILL NOT MUCH INSTABILITY
GETTING UP INTO OUR AREA, SO STILL THINKING THAT SEVERE CHANCES
LOOK TO BE SOUTH OF THE REGION.
FROM TUESDAY NIGHT INTO THURSDAY, A CLOSED LOW PRESSURE AREA
WILL DEVELOP FROM THE NORTHERN AND CENTRAL PLAINS EAST INTO THE
OHIO VALLEY AND GREAT LAKES. AS SHORTWAVE TROUGHS ROTATE AROUND
THIS BROAD UPPER LEVEL LOW, THERE WILL BE AREAS OF SNOW, MIXED
PRECIPITATION, AND RAIN. THE STRONGEST CYCLOGENESIS CONTINUES TO
LOOK LIKE IT WILL DEVELOP OVER THE OHIO RIVER VALLEY AND GREAT
LAKES. MUCH OF THE PRECIPITATION ASSOCIATED WITH THAT SYSTEM
WILL REMAIN TO THE EAST OF OUR AREA. STILL SOME UNCERTAINTY OF
THE TRACK OF ADDITIONAL SHORTWAVE TROUGHS DROPPING SOUTHEAST
THROUGH MINNESOTA AND IOWA. THESE SYSTEMS WILL PRODUCE SOME
LIGHT RAIN AND SNOW SHOWERS; HOWEVER, AT THIS TIME, ANY SNOW IN
OUR AREA LOOKS TO BE MAINLY A DUSTING IF ANY.
AVIATION /18Z TAFS THROUGH 18Z SUNDAY/
ISSUED AT 1152 AM CST SAT NOV 16 2024
A COLD FRONT WILL MOVE EAST THROUGH THE REGION THIS EVENING.
MVFR CLOUDS CURRENTLY ALONG AND EAST OF THE MISSISSIPPI RIVER
WILL SPREAD ACROSS THE REMAINDER OF THE AREA THIS AFTERNOON AND
THEN PERSIST INTO THE OVERNIGHT. SOUTHEAST WINDS WILL GUST INTO
THE 20 TO 30 MPH EVENING. THE WINDS WILL THEN SHIFT TO WEST
DURING THE LATE EVENING AND OVERNIGHT AND THE WIND GUSTS WILL
SUBSIDE IN THE WAKE OF THE FRONT. CEILINGS WILL GRADUALLY BECOME
VFR ON SUNDAY MORNING.
ARX WATCHES/WARNINGS/ADVISORIES
WI...NONE.
MN...NONE.
IA...NONE.
DISCUSSION...BOYNE
AVIATION...BOYNE
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