Area Forecast Discussion
Issued by NWS Milwaukee/Sullivan, WI

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FXUS63 KMKX 260817
AFDMKX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI
317 AM CDT SUN APR 26 2015

.SHORT TERM...

TODAY AND TONIGHT...FORECAST CONFIDENCE IS HIGH.

AN UPPER LEVEL TROUGH ACROSS FAR SOUTHEAST CANADA EXTENDS BACK INTO
THE UPPER GREAT LAKES.  THIS TROUGH DROPS SOUTH A LITTLE AND BUILDS
BACK INTO WISCONSIN THIS EVENING. LITTLE IN THE WAY OF UPPER
DIVERGENCE OR 700 MB UPWARD MOTION.  THERE IS SOME INCREASE IN 700
MB RH THIS AFTERNOON FROM THE EAST THAT REACHES THE LAKE MICHIGAN
COUNTIES.  850 MB RH ALSO INCREASES...BUT MAINLY LATER TONIGHT.
HOWEVER IT IS NOT SATURATED...SO DO NOT EXPECT ANY EXTENSIVE CLOUD
SHIELD.

THE MAIN CONCERN IS THE INCREASE IN 700 MB WINDS THIS AFTERNOON...
AND THE 850 MB WINDS MAINLY TONIGHT.  WHILE THE 700 MB WIND INCREASE
OCCURS ACROSS SOUTHERN WISCONSIN THE 850 MB WIND INCREASE IS MAINLY
NEAR LAKE MICHIGAN.  WITH SURFACE HEATING WIND GUSTS...WHILE NOT
STRONG...WILL LIKELY BE STRONGER THAN THE WEAK SURFACE PRESSURE
GRADIENT SUGGESTS.

WITH THE NORTHEAST WINDS OFF LAKE MICHIGAN...EXPECT TYPICAL
SPRINGTIME COOLING NEAR LAKE MICHIGAN...WITH MILD TEMPERATURES WELL
INLAND.

.LONG TERM...

MONDAY THROUGH THURSDAY... FORECAST CONFIDENCE HIGH.

DRY AIR AND MID LEVEL RIDGING WILL NOSE INTO THE WESTERN GREAT LAKES
EARLY THIS WEEK AS A SPRAWLING CLOSED UPPER LOW OVER NEW ENGLAND
SHIFTS EAST. SURFACE HIGH PRESSURE WILL TAKE HOLD OF THE UPPER
MIDWEST AND GREAT LAKES THROUGH THURSDAY AND BRING A PLEASANT
STRETCH OF WEATHER TO SOUTHERN WI. THERE WILL BE A STEADY BREEZE OUT
OF THE NORTH THROUGH THIS PERIOD... BUT WITH THE WEAK PRESSURE
GRADIENT WE CAN EXPECT A LAKE BREEZE TO DEVELOP EACH DAY. INLAND
TEMPS WILL BE IN THE 60S FOR THIS PERIOD WHILE LAKESHORE TEMPS WILL
BE STUCK IN THE 50S.

A MID LEVEL SHORTWAVE WILL DROP DOWN THROUGH WI TUE AFTERNOON/
EVENING. BOTH THE ECMWF AND GFS MODELS NOW HAVE A DRY FORECAST FOR
TUE NIGHT AND WEDNESDAY. THIS UPPER TROUGH WILL BRING AT LEAST A MID
LEVEL CLOUD DECK... WITH THE POSSIBILITY OF SOME SPRINKLES.

FRIDAY THROUGH SUNDAY... FORECAST CONFIDENCE MEDIUM.

ANOTHER SHORTWAVE TROUGH CROSSING THE NORTHERN PLAINS WILL BRING OUR
NEXT CHANCE FOR RAIN FRIDAY NIGHT. THUNDER IS DEBATABLE. THERE MAY
BE SOME WEAK ELEVATED INSTABILITY TO SUPPORT ISOLATED THUNDER. LEFT
IT OUT OF THE FORECAST UNTIL THERE IS MORE CERTAINTY.

THE GFS AND ECMWF TAKE ON SLIGHTLY DIFFERENT UPPER LEVEL WEATHER
PATTERNS LATER NEXT WEEKEND... BUT BOTH RESULT IN PRECIP CHANCES
SATURDAY NIGHT INTO SUNDAY. THE GFS KEEPS TEMPERATURES SLIGHTLY
COOLER THAN THE ECMWF DUE TO A NORTHWEST FLOW PATTERN.

&&

.AVIATION/12Z TAFS/...

EXPECTING VFR CONDITIONS THROUGH THE FORECAST. COULD SEE SOME
DIURNAL CUMULUS THIS AFTERNOON...ESPECIALLY OVER EASTERN PORTIONS OF
THE FORECAST AREA AWAY FROM THE MORE STABLE EFFECTS NEAR LAKE
MICHIGAN.  SOME CLOUDS IN THE 5 TO 8 THSD FT RANGE MAY AFFECT THE
SOUTHEAST LATER THIS AFTERNOON AND TONIGHT FROM A WEAK TROUGH AXIS
ROTATING AROUND THE BACK SIDE OF ELONGATED UPPER TROUGH CENTERED
OVER THE CANADIAN MARITIMES.  DRY AIR IN PLACE SHOULD LIMIT COVERAGE
TO MAINLY SCATTERED.

NORTHEAST WIND GUSTS WILL INCREASE AGAIN WITH MIXING BUT WITHOUT THE
GUSTS LIKE SATURDAY.

&&

.MARINE...

WINDS ARE EASING TO BELOW SMALL CRAFT ADVISORY CRITERIA THIS
MORNING. A SURGE IN STRONGER NORTH/NORTHEAST WINDS LATER THIS
AFTERNOON AND TONIGHT COULD PUSH WINDS AND WAVES BACK TOWARDS SMALL
CRAFT LEVELS.

&&

.FIRE WEATHER...

MIN RH VALUES WILL DROP TO AROUND 25 PCT WELL INLAND AND ESPECIALLY
OVER SOUTH CENTRAL WISCONSIN...MAYBE DOWN TOWARDS 20 PCT.

THE MAIN CONCERN IS THE INCREASE IN 700 MB WINDS THIS AFTERNOON...
AND THE 850 MB WINDS MAINLY TONIGHT.  WHILE THE 700 MB WIND INCREASE
OCCURS ACROSS SOUTHERN WISCONSIN THE 850 MB WIND INCREASE IS MAINLY
NEAR LAKE MICHIGAN.  WITH SURFACE HEATING WIND GUSTS...WHILE NOT
STRONG...WILL LIKELY BE STRONGER THAN THE WEAK SURFACE PRESSURE
GRADIENT SUGGESTS.

&&

.MKX WATCHES/WARNINGS/ADVISORIES...
WI...NONE.
LM...NONE.
&&

$$

TODAY/TONIGHT AND AVIATION/MARINE...HENTZ
MONDAY THROUGH SATURDAY...MRC


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