Area Forecast Discussion
Issued by NWS Green Bay, WI

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FXUS63 KGRB 261009 AAA
AFDGRB

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE GREEN BAY WI
509 AM CDT SAT JUL 26 2014

NEW INFORMATION ADDED TO UPDATE SECTION

.UPDATE...
ISSUED AT 508 AM CDT SAT JUL 26 2014

MID LEVEL DRYING EVIDENT WITH THE WATER VAPOR LOOP WAS AIDING WITH
LOWERING WET BULBS ACROSS NORTHEAST WISCONSIN EARLY THIS MORNING.
COMBINED WITH SOME MID LEVEL INSTABILITY WITH THE SHORT
WAVE...ISOLATED STORMS WERE PRODUCING UP TO NICKEL SIZE HAIL OVER
FOREST AND MARINETTE COUNTIES. STORMS WERE PULSING AND WILL
CONTINUE TO BE MONITORED FOR A POSSIBLE WARNING THIS MORNING...BUT
SO FAR HAVE NOT EXCEEDED THE STORM WHICH PASSED NEAR LAONA WHICH
PRODUCE NICKEL SIZE HAIL.
&&

.SHORT TERM...TODAY...TONIGHT...AND SUNDAY
ISSUED AT 333 AM CDT SAT JUL 26 2014

EARLY THIS MORNING...AREA RADARS AN OBSERVATIONS SHOW ISOLATED
TO SCATTERED SHOWERS WITH AN ISOLATED THUNDERSTORM PASSING OVER
NORTHERN WISCONSIN. CONVECTION ASSOCIATED WITH A  SHORT WAVE
PASSING OVER THE NORTHERN GREAT LAKE REGION IN THE LFQ REGION OF
THE UPPER JET AND AHEAD OF A WEAK FRONTAL SYSTEM TRACKING OVER THE
STATE. IN ADDITION MU CAPES NEAR 400 IN THE 800 TO 700 MB LEVEL
WERE AIDING WITH MORE STORMS ACROSS THE NORTH CENTRAL WISCONSIN
EARLY THIS MORNING. TIMING OF THIS FRONTAL SYSTEM AND UPPER JET
DYNAMICS MAY SUGGEST KEEPING AN ISOLATED MENTION OF SHOWERS/STORMS
IN THE MORNING HOURS OVER EASTERN WISCONSIN. THESE DYNAMICS WERE
RUNNING A TAD SLOWER THAN PROGS 24 HOURS AGO.

OTHERWISE ANTICIPATE A DRY PERIOD LATER TODAY AS THE UPPER JET
SUPPORT LESSONS...THE FRONTAL BOUNDARY SHIFTS EAST AND WEAK
RIDGING AHEAD OF THE APPROACHING UPPER LOW FROM SOUTHERN CANADA.
A FEW MODELS LINGER SPOTTY CONVECTION OVER LAKE MICHIGAN AND DOOR
COUNTY INTO THE EARLY AFTERNOON HOURS...SO WILL CONSIDER LONGER
DURATION MINOR POPS IN THIS REGION TODAY. FORECAST SOUNDINGS FOR
EACH THE NAM AND GFS GENERATE SOME HEALTHY CAPES THIS AFTERNOON
OVER MUCH OF THE FORECAST AREA...BUT NO TRIGGER...UNLESS THE
FRONTAL BOUNDARY HANGS AROUND THIS AFTERNOON OVER EASTERN AREAS...SO
SOME CONCERN WITH GOING WITH A DRY FORECAST.

PLENTY OF CLOUDS NEAR AND AHEAD OF THIS SURFACE FRONTAL BOUNDARY
BUT WITH THE WARM START THIS MORNING AND DECREASING CLOUDS LATER
TODAY...WILL NOT ADJUST TEMPS MUCH...PERHAPS A FEW DEGREES COOLER
DUE TO LINGERING CLOUDS WITH THE SLOWER SURFACE BOUNDARY.

FOCUS THEN TURNS TO THE UPPER LOW SYSTEM TO DROP OVER THE REGION
TONIGHT INTO SUNDAY. ANTICIPATE SHOWERS WITH ISOLATED STORMS TO BE
ON THE INCREASE FROM NORTHWEST TO SOUTHEAST TONIGHT AND THEN
WIDESPREAD FOR SUNDAY. HOPEFULLY THE REGION WILL GET SOME MUCH
NEEDED RAIN WITH THIS SYSTEM. MAX TEMPS FOR SUNDAY LIKELY TO OCCUR
AROUND NOON BEFORE BECOMING STEADY WITH RAIN AND CAA PATTERN
DEVELOPING. TOTAL TOTALS IN THE LOWER 50S AND WEB BULB TEMPS
FALLING TO AROUND 8500 SUNDAY AFTERNOON PROVIDES SOME POTENTIAL OF
HAIL WITH ANY OF THE STORMS.

.LONG TERM...SUNDAY NIGHT THROUGH FRIDAY
ISSUED AT 333 AM CDT SAT JUL 26 2014

MODELS WERE IN GOOD AGREEMENT...SHOWING A CLOSED 500MB LOW OVER
QUEBEC WITH A TROUGH OVER THE EASTERN 2/3RDS OF THE CONUS. THIS
PATTERN IS NOT EXPECTED TO CHANGE MUCH DURING THE UPCOMING WEEK.
TIMING OF SHORT WAVES IN NORTHWEST FLOW ALOFT WILL BE A CHALLENGE
AS THESE FEATURES WILL BRING CHANCES FOR RAIN. SOME SHOWERS AND
STORMS ARE POSSIBLE IN INSTABILITY AROUND OR AFTER PEAK DAYTIME
HEATING. POPS ARE IN THE SLIGHT CHANCE OR LOW END CHANCE
CATEGORIES FOR MOST OF THE LONG TERM. HIGH TEMPERATURES SHOULD BE
NEAR OR SLIGHTLY BELOW NORMAL FOR THIS TIME OF YEAR WITH CLOUDS
AND STORMS.
&&

.AVIATION...FOR 06Z TAF ISSUANCE
ISSUED AT 1033 PM CDT FRI JUL 25 2014

SOME HOLES DEVELOPING IN THE OVERCAST OVER STATE. EXPECT WILL FILL
IN THROUGH THE NIGHT...THOUGH MAY LEAD TO BIT MORE FOG THAN
THOUGHT PREVIOUSLY. WILL STAY WITH MVFR VSBY GIVEN WIND AT THIS
TIME. LIGHT SHOWER ACTIVITY PASSING THROUGH FAR NORTH...THOUGH
EXPECT DRY CONDITIONS TO CONTINUE AT TAF SITES. RELATIVELY QUICK
IMPROVEMENT TO THE CIGS/VSBYS SHOULD OCCUR TOMORROW MORNING WITH
DAYTIME HEATING AND MIXING.
&&

.GRB WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

UPDATE.........TDH
SHORT TERM.....TDH
LONG TERM......MG
AVIATION.......TE






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