Area Forecast Discussion
Issued by NWS Green Bay, WI

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000
FXUS63 KGRB 242038
AFDGRB

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
338 PM CDT FRI JUL 24 2015

FORECAST DISCUSSION FOR ROUTINE AFTERNOON FORECAST ISSUANCE

.SHORT TERM...TONIGHT AND SATURDAY
ISSUED AT 338 PM CDT FRI JUL 24 2015

THUNDERSTORM POTENTIAL IS THE MAIN CONCERN IN THE SHORT TERM.
STORMS OVERNIGHT MISSED THE AREA TO THE SOUTHWEST WITH ONLY SOME
SHOWERS MAKING IT TO CENTRAL AND NORTH CENTRAL WISCONSIN. AT 19Z
A COLD FRONT EXTENDED FROM THE MINNESOTA ARROWHEAD TO NORTHWEST
IOWA...AND A RIDGE EXTENDED FROM HIGH PRESSURE OVER THE OHIO
VALLEY INTO WISCONSIN. DEBRIS CLOUDS FROM EARLIER CONVECTION WERE
CLEARING OUT OF CENTRAL WISCONSIN LATE THIS AFTERNOON BUT 19Z
MESOANALYSIS GRAPHICS SHOWED THAT CENTRAL WISCONSIN HAD NOT YET
DESTABILIZED. FARTHER NORTH...MUCAPES WERE AS HIGH AS 500J/KG WITH
NO CIN. RADAR WAS SHOWING SOME DEVELOPMENT IN THE NORTHWEST PART
OF THE STATE WHERE MUCAPE WAS MORE THAN 1000J/KG. MODELS HAD SOME
SHORT WAVE ENERGY PUSHING EASTWARD FROM THE NORTHERN PLAINS BUT
THIS DID NOT SEEM READILY APPARENT ON WATER VAPOR IMAGERY.

STORMS SHOULD MAINLY HOLD OFF UNTIL THE FRONT DRAWS NEAR...WITH
MOST OF THE CONVECTION BETWEEN 00Z AND ABOUT 08Z. AREAS OF FOG
POSSIBLE TONIGHT AS WINDS DIMINISH...ESPECIALLY AT ANY LOCATIONS
THAT RECEIVE HEAVY RAIN. EXPECT PLENTY OF SUNSHINE FOR SATURDAY.

.LONG TERM...SATURDAY NIGHT THROUGH FRIDAY
ISSUED AT 338 PM CDT FRI JUL 24 2015

UPPER LEVEL RIDGING WILL TAKE HOLD OF THE WEATHER FOR THE LATE
PART OF THE WEEKEND AND INTO THE EARLY PART OF NEXT WEEK...HOWEVER
SEVERAL SHORTWAVES RIDING ALONG THE PERIPHERY OF THE RIDGE WILL
BRING CONTINUED CHANCES FOR SHOWERS AND THUNDERSTORM DURING THIS
PERIOD. THE RIDGE EVENTUALLY TRACKS EAST...ALLOWING FOR TROUGHING
TO TRACK OVER THE WESTERN GREAT LAKES REGION DURING THE MIDDLE
PART OF NEXT WEEK.

THE LOW ASSOCIATED WITH THIS TROUGH WILL SLOWLY TRACK EAST
THROUGH SOUTHERN CANADA THROUGH THE LATE PART OF NEXT WEEK...WITH
A SURFACE HIGH BRINGING SEVERAL PERIODS OF DRY WEATHER DURING THE
LATE PART OF NEXT WEEK. YET ANOTHER LOW PRESSURE SYSTEM COULD
BRING A RETURN OF SHOWERS AND THUNDERSTORMS AS IT APPROACHES FROM
THE WEST ON FRIDAY. TEMPERATURES DURING NEXT WEEK LOOK TO BE
ABOVE NORMAL FOR THIS TIME OF YEAR.
&&

.AVIATION...FOR 18Z TAF ISSUANCE
ISSUED AT 1258 PM CDT FRI JUL 24 2015

MID AND HIGH CLOUDS FROM MORNING CONVECTION COVERED THE SOUTHERN
PART OF THE FORECAST AREA AT 17Z. MODELS INDICATED INCREASING LOW
LEVEL RH VALUES...MAINLY DURING THE NIGHT...BUT SOME MVFR CIGS
ALREADY DEVELOPED ACROSS PARTS OF CENTRAL AND NORTH CENTRAL
WISCONSIN.

AN APPROACHING COLD FRONT IS EXPECTED TO TRIGGER MORE
THUNDERSTORMS AS IT MOVES INTO AND ACROSS CENTRAL AND EASTERN
WISCONSIN THIS EVENING/TONIGHT. MVFR...ALONG WITH SOME
IFR...CONDITIONS ARE EXPECTED OVERNIGHT...BUT THEY SHOULD IMPROVE
TO VFR ON SATURDAY MORNING.
&&

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

$$

SHORT TERM.....MG
LONG TERM......KURIMSKI
AVIATION.......MG


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