Area Forecast Discussion
Issued by NWS La Crosse, WI

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FXUS63 KARX 162008
AFDARX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LA CROSSE WI
308 PM CDT WED APR 16 2014

.SHORT TERM...(THIS EVENING THROUGH THURSDAY)
ISSUED AT 307 PM CDT WED APR 16 2014

MAIN FORECAST CONCERNS ARE ON SNOW TONIGHT OVER NORTH CENTRAL
WISCONSIN. FOCUS THEN TURNS TO RAIN CHANCES THIS WEEKEND.

LATEST SURFACE OBSERVATIONS SHOWED LOW PRESSURE CENTERED NEAR SIOUX
CITY WITH A WARM FRONT EXTENDING NORTHEAST THROUGH SOUTHERN
MINNESOTA INTO NORTH CENTRAL WISCONSIN. THE LOW WILL CONTINUE
MOVING NORTHEAST LATE THIS AFTERNOON INTO TONIGHT WITH SNOW
FALLING ON THE NORTHERN AND NORTHWEST SIDE OF THE LOW TRACK. THE
SNOW WILL CONTINUE TO BE HEAVY AT TIMES ESPECIALLY OVER NORTHWEST
WISCONSIN. NORTH CENTRAL WISCONSIN HAS BEEN EXPERIENCING SNOW
TODAY HOWEVER LOCATIONS SOUTH OF THE WISCONSIN HIGHWAY 10 CORRIDOR
HAVEN/T SEEN ANY PRECIPITATION BEING POSITIONED IN THE WARM
SECTOR THROUGH MUCH OF THE DAY. THESE ARES COULD SEE SOME LIGHT
PRECIPITATION ALONG THE COLD FRONT TONIGHT OR ON THE BACK SIDE OF
THE LOW AS IT TRACKS INTO NORTH CENTRAL WISCONSIN LATER TONIGHT. 4
INCHES OF SNOW HAS BEEN REPORTED SO FAR TODAY IN NORTHWEST TAYLOR
COUNTY. PLAN ON AN ADDITIONAL 1 TO 3 INCHES TONIGHT AS THE
DEFORMATION ZONE SLIDES INTO TAYLOR COUNTY. WILL CONTINUE THE
WINTER WEATHER ADVISORY IN TAYLOR BUT HAVE DECIDED TO CANCEL IT
FOR CLARK COUNTY. FORECAST SOUNDINGS SHOW ICE BEING LOST ALOFT
TONIGHT BEFORE THE PRECIPITATION EXIT. ANY LINGERING
PRECIPITATION  LATE TONIGHT INTO EARLY THURSDAY MORNING COULD
SWITCH OVER TO DRIZZLE OR FREEZING DRIZZLE WHERE SURFACE
TEMPERATURES ARE COLD ENOUGH. HOWEVER...WITH THE SOUTHERLY FLOW
KEEPING TEMPERATURES MAINLY ABOVE FREEZING TONIGHT FREEZING
DRIZZLE SHOULDN/T BE A PROBLEM TONIGHT. A MOSTLY CLOUDY AND
UNSEASONABLY COOL DAY IS IN STORE FOR THE REGION ON THURSDAY IN
THE WAKE OF THE LOW WITH HIGHS RANGING FROM THE UPPER 30S OVER
NORTH CENTRAL WISCONSIN TO THE MID TO UPPER 40S ACROSS NORTHEAST
IOWA.

.LONG TERM...(THURSDAY NIGHT THROUGH WEDNESDAY)
ISSUED AT 307 PM CDT WED APR 16 2014

COOL HIGH PRESSURE BUILDS IN THURSDAY NIGHT PROVIDING PARTLY CLOUDY
SKIES AND CHILLY CONDITIONS. PLAN ON OVERNIGHT LOWS FALLING INTO THE
20S. THE HIGH IS EXPECTED TO SLIDE EAST ON FRIDAY AS UPPER RIDGING
BUILDS IN FROM THE NORTHERN PLAINS. A WEAK SHORTWAVE SLIDES OVER THE
REGION DURING THE DAY ON FRIDAY AS WARM AIR ADVECTION INCREASES FROM
850-700 MB...WHICH COULD LEAD TO SOME LIGHT PRECIPITATION OVER
PORTIONS OF NORTHEAST IOWA AND SOUTHEAST MINNESOTA BUT THE BULK OF
THIS ACTIVITY LOOKS TO STAY WEST OF THE INTERSTATE 35 CORRIDOR. IF
THE PRECIPITATION  OCCURS BEFORE MID MORNING IT WOULD LIKELY FALL
IN THE FORM OF VERY LIGHT SNOW. IF IT OCCURS IN THE LATE MORNING
INTO THE AFTERNOON HOURS TEMPERATURES WOULD BE WARM ENOUGH FOR THE
PRECIPITATION TYPE TO BE RAIN.

THE RIDGE SLIDES OVER THE UPPER MISSISSIPPI RIVER VALLEY FRIDAY
NIGHT INTO SATURDAY MORNING AS A SURFACE TROUGH DEVELOPS OVER THE
PLAINS PLACING THE FORECAST AREA IN SOUTHERLY FLOW AT THE SURFACE. A
WEAK COLD FRONT WILL SLIDE SOUTHEAST INTO THE REGION SATURDAY
AFTERNOON INTO SATURDAY EVENING AS LOW PRESSURE TRACKS ACROSS
SOUTHERN MANITOBA. SHOWERS AND ISOLATED THUNDERSTORMS ARE EXPECTED
ALONG AND AHEAD OF THE BOUNDARY. THE BOUNDARY THEN EDGES SOUTH
AND BECOMES NEARLY STATIONARY OVER NORTHEAST IOWA AND SOUTHERN
MINNESOTA. FORECAST SOUNDINGS ARE SHOWING VERY WEAK CAPE
VALUES...ONLY YIELDING AROUND 100 MB OF CAPE WHEN LIFTING FROM 700
MB. THINKING THIS SHOULD BE ENOUGH TO SEE SOME LIGHTING OUT OF
THIS ACTIVITY. PRECIPITABLE WATER VALUES APPROACH 1.3 INCHES. IT
APPEARS MOST AREAS WILL SEE BETWEEN 0.4 AND 1 INCH OF RAINFALL
FROM LATE SATURDAY AFTERNOON THROUGH SUNDAY.THE BOUNDARY FINALLY
SHIFTS SOUTHEAST OF THE REGION LATE MONDAY INTO SUNDAY AS A MUCH
HIGHER AMPLITUDE RIDGE BUILDS INTO THE PLAINS AND UPPER MIDWEST AS
A LARGE TROUGH DIGS INTO THE WEST COAST. THIS RIDGE LOOKS TO
BRING MUCH WARMER TEMPERATURES TO THE REGION ALONG WITH AN ACTIVE
PATTERN...ESPECIALLY DURING THE MIDDLE TO LATER PART OF NEXT WEEK
ALSO...THE WEST COAST TROUGH DRAWS CLOSER AND SOUTHWEST FLOW ALOFT
ATTEMPTS TO EDGE INTO THE UPPER MISSISSIPPI RIVER VALLEY WHICH
WOULD ALSO FAVOR AN ACTIVE WEATHER PATTERN. WILL HAVE TO KEEP A
CLOSE EYE ON THIS OVER THE NEXT FEW MODEL RUNS. HIGH TEMPERATURES
NEXT WEEK LOOK TO CLIMB BACK INTO THE 60S WITH THE POTENTIAL TO
SEE SOME LOW TO MID 70S.

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z THURSDAY AFTERNOON)
ISSUED AT 1205 PM CDT WED APR 16 2014

MIXING WILL CONTINUE HIGHER WIND GUSTS THROUGH THE
AFTERNOON...STAYING SOUTHEASTERLY BEFORE A COLD FRONT SWEEPS IN
OVERNIGHT. WINDS BECOME WESTERLY POST THE FRONT...WITH THE PRESSURE
GRADIENT STAYING FAIRLY TIGHT THROUGH THU MORNING.

CIGS WILL STAY VFR AHEAD OF THE FRONT...WITH BUFKIT SOUNDINGS AND RH
FIELDS POINTING TO A DROP INTO MVFR - POTENTIALLY IFR - AFTER THE
FRONT MOVES THROUGH. MOST OF THE PCPN ASSOCIATED WITH THIS SYSTEM
WILL FALL TO THE NORTH...WITH SIGNIFICANT SNOW ACCUMULATIONS. THAT
SAID...MESO MODELS CONTINUE TO SUGGEST SOME LIGHT PCPN ALONG AND
BEHIND THE FRONT...WHICH MATCHES WITH THE LATEST RADAR TRENDS. TEMP
PROFILES SUPPORT MOSTLY RAIN AT THIS TIME. SOUNDINGS ARE SUGGESTING
A LOSS OF ICE AS THE FRONT WORKS ACROSS WESTERN WI OVERNIGHT...WHICH
WOULD RESULT IN DRIZZLE/VERY LIGHT RAIN. FREEZING PCPN WOULD BE A
CONCERN IF GROUND TEMPS ARE COLD ENOUGH. CONFIDENCE NOT HIGH ENOUGH
THAT THIS WILL OCCUR...SO WILL LEAVE OUT OF THE FORECAST FOR NOW.

WITH THE LOW MOVING INTO EASTERN WI BY 18Z THU...EXPECT SOME
CLEARING FROM WEST-EAST OF THE CLOUD COVER. GUIDANCE WOULD KEEP
BKN/OVC SKIES...BUT SOUNDINGS POINT TO MIXING OUT OF THE LOW CIGS.
GOING TO TREND THE FORECAST THIS WAY.


&&

.HYDROLOGY...
ISSUED AT 307 PM CDT WED APR 16 2014

RUNOFF FROM RECENT RAINFALL AND SNOWMELT HAS CREATED ELEVATED
RIVER LEVELS ALONG THE MISSISSIPPI RIVER. MINOR FLOODING IS
EXPECTED AT WABASHA AND MCGREGOR AND FLOOD WARNINGS ARE IN
EFFECT.

&&

.ARX WATCHES/WARNINGS/ADVISORIES...
WI...WINTER WEATHER ADVISORY UNTIL 7 AM CDT THURSDAY FOR WIZ017.

MN...NONE.
IA...NONE.
&&

$$

SHORT TERM...WETENKAMP
LONG TERM...WETENKAMP
AVIATION.....RIECK
HYDROLOGY...WETENKAMP



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