Severe Thunderstorm Warning 27, NWS Green Bay, WI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GREEN BAY WI
341 AM CDT WED JUL 14 2010

.SHORT TERM...TODAY/TONIGHT/THURSDAY. MAIN FORECAST EMPHASIS
DURING THIS PERIOD WILL BE THE SEVERE THUNDERSTORM POTENTIAL LATER
TODAY INTO TONIGHT. OVERNIGHT CONVECTION OVER NORTHERN MN DEVELOPED
NORTH OF THE H8 WARM FRONT AND IN A DIVERGENT ALOFT REGION. THIS
ISOLATED CONVECTION DIMINISHED EARLY THIS MORNING AS IT MOVED INTO
A DRIER AND MORE STABLE AIR MASS. IN ADDITION...THE CONVECTION
CONTINUES TO MOVE NORTHEAST OF THE MID LEVEL CAP EDGE. ANOTHER
MORE ORGANIZED AREA OF CONVECTION NEAR THE UPPER LOW DYNAMICS WAS
PUSHING TOWARD THE LAKE OF THE WOODS REGION NORTH OF MINNESOTA.
OTHERWISE THE ATTENTION THEN TURNS WEST OVER THE DAKOTAS WITH A
CLUSTER OF STORMS DEVELOPING IN THE TROF AXIS PIVOTING IN THE BASE
OF THE UPPER LOW. THIS FEATURE IS PROGGED TO TRACK NE ALONG THE
CAP EDGE AS PER GFS BUT EAST AS PER NAM AND ECMWF. AT
08Z...TRENDS OF THIS FAST MOVING CONVECTION IS DUE EAST TOWARD THE
DLH VICINITY AROUND MID MORNING. CURRENTLY BRING IN CHC OF STORMS
TO NC AT NOON...WILL MONITOR THIS CONVECTION THIS MORNING FOR A
POSSIBLE FASTER START TIME TO TSRA FOR NC WI. BIG CHALLENGE WITH
THE FORECAST OF STORMS AS WELL AS SEVERE WEATHER POTENTIAL IS HOW
STRONG THIS CAP WILL BE OVER WISCONSIN LATER TODAY AS THIS TROF
APPROACHES THE AREA FOLLOWED BY INCREASING MID LEVEL WINDS WHICH
INCREASES THE DEEP LAYER SHEAR PRIOR TO THE COLD FRONT PASSAGE.

MODEL STABILITY PROGS AND LATEST SPC GUIDANCE INDICATES A
CONTINUED SEVERE WEATHER THREAT LATER TODAY INTO THIS
EVENING...ESPECIALLY OVER THE WESTERN HALF OF WI INCLUDING PARTS
OF CENTRAL AND NORTH CENTRAL WI. MODELS IN GENERAL ATTEMPT TO
GENERATE TWO AREAS OF PCPN...ONE AREA LIFTING OVER THE FAR NW
PORTION OF WISCONSIN WITH THE MAIN SYSTEM AND A SECOND FIRING UP
ALONG THE INTERSECTION OF THE WESTERLY FLOW AND CAP EDGE WITH THE
FROPA. BUT CAP GRADUALLY DIMINISHES AS HEIGHT FALLS APPROACH FROM
THE WEST SO ANTICIPATE THE CONVECTION TO INCREASE ALONG THE FROPA.
SEVERE POTENTIAL MAY LINGER TONIGHT OVER EASTERN SECTIONS AS THE
FRONT CONTINUES TO TRACK OVER THE STATE AND DEEP LAYER SHEAR
REMAINS WITH THE WESTERLY FLOW ALOFT. WITH SURFACE DEW POINTS
FORECAST TO CLIMB INTO THE LOWER 70S OVER CENTRAL WI...LCL/S LOWER
TO AID IN A INCREASED TORNADO THREAT OVER THIS REGION AND POINTS
WESTWARD.

A BIT MORE CLOUDS AROUND THE 3 TO 5 K LEVEL DEVELOPED EARLY THIS
MORNING OVER MN AND CENTRAL WISCONSIN. CLOUDS DEVELOPING NORTH
AND NORTHEAST OF THE H8 BOUNDARY WHICH LIKELY IS MOISTURE WORKING
INTO A MORE STABLE AIR MASS AT THIS TIME. NOT SURE ON THE TRENDS OF
THESE CLOUDS AT THIS TIME BUT IF THE CLOUDS CONTINUE TO
INCREASE...COULD PLAY A ROLE WITH THE DECREASED LEVEL AND COVERAGE
OF SEVERE WEATHER DO TO REDUCED AFTERNOON HEATING. DEBRIS CLOUDS
FROM FAST APPROACHING NORTH DAKOTA SYSTEM MAY WORK OVER NORTHERN
WI A BIT FASTER TODAY AS WELL.

INCREASING TEMPS AND DEW POINTS AHEAD OF THE COLD FRONT TODAY WILL
PUSH INDICES WELL INTO THE 90S OVER PARTS OF CENTRAL WI BUT BELOW
CRITERIA. INCREASING SSE WINDS WILL REDUCE AFFECTS.

.LONG TERM...THU NGT THRU NXT WED. MEAN UPR TROFS ACROSS THE FAR
SE AND SW CORNER OF CANADA WITH A SUBTROPICAL RDG OVR THE SRN U.S.
WL BE THE MAIN WEATHER FEATURES DURING THE PERIOD. MAIN FCST ISSUE
CENTERS AROUND PCPN TIMING/CONVECTIVE STRENGTH THIS WEEKEND
ASSOCIATED WITH A CDFNTL PASSAGE AND A SHRTWV TROF ALOFT.

RELATIVELY STG...VERTICALLY STACKED SYSTEM TO CONT SLOWLY MOVG
ACROSS CNTRL SECTIONS OF ONTARIO THU NGT WITH THE CDFNT PULLING
AWAY TOWARD THE ERN GREAT LKS. THIS LEAVES A WEAK AREA OF HI PRES
TO PUSH INTO THE MIDWEST AND HELP TO BRING IN DRIER AIR TO WI.
JUST ENUF MIXING EXPECTED TO PREVENT TEMPS FROM DROPPING TOO FAR
WITH MOST AREAS IN NE WI DIPPING INTO THE 60 TO 65 DEG RANGE.

THIS HI PRES IS EXPECTED TO DRIFT ACROSS IL ON FRI WITH A DRY
WESTERLY WND IN PLACE OVR WI. OTHER THAN SOME FAIR WEATHER CU
POPPING UP IN THE DAYTIME HEATING...ANTICIPATE A DECENT AMT OF
SUNSHINE DURING THE DAY. ONE THING THAT DOES NEED TO BE WATCHED IS
A WEAK SFC TROF THAT THE MDLS DROP SE INTO WI FRI AFTERNOON. AS OF
NOW...A LACK OF MSTR AND MARGINAL INSTABILITY PRECLUDES THE MENTION
OF PCPN. 8H TEMPS SLOWLY RISING TO AROUND +17C SHOULD TRANSLATE TO
MAX TEMPS RANGING FROM THE LWR 80S N-CNTRL...TO THE MID-UPR 80S
OVR PARTS OF CNTRL WI.

ONCE THIS LITTLE SFC TROF SAGS SOUTH BY FRI EVENING...THE REST OF
THE NGT LOOKS QUIET WITH NO SIGNIFICANT WEATHER FEATURES IN THE
VCNTY. A SLGT COOLDOWN ALOFT WL ALLOW FOR SOME UPR 50S IN THE
NORTH WITIH 60S ELSEWHERE. A NEW SHRTWV TROF IS FCST TO MOV ACROSS
THE CANADIAN PRAIRIE (VCNTY LK WINNIPEG) ON SAT WITH A CDFNT
PRECEDING THE TROF OVR THE NRN PLAINS. WE COULD SEE SOME INCREASE
IN HI OR MID CLDS SAT AFTERNOON...BUT ENUF MIXED SUNSHINE AND A
RETURN TO SOUTHERLY WNDS ARE EXPECTED TO ALLOW TEMPS TO RETURN TO
THE 80S ONCE AGAIN.

THE SHRTWV TROF MOVS INTO THE NRN SECTIONS OF THE UPR MIDWEST BY
SAT NGT AND DRIVES THE CDFNT INTO WRN WI BY 12Z SUNDAY. SUFFICIENT
LOW-LV MSTR TO HAVE RETURNED TO WI WITH DEW PTS IN THE 60S AND PW
VALUES AROUND 1.5 INCHES. HIGHER CHC POPS TO BE PLACED OVR CNTRL
WI DUE TO THE PROXIMITY OF THE CDFNT SAT NGT AND THEN OVR ERN WI
ON SUNDAY AS THE FNT QUICKLY SHIFTS EWD. HAVE ATTEMPTED TO ADD A
BIT OF TIMING CONTINUITY TO THE FCST...BUT CHC POPS SUFFICE FOR
NOW. ANY SVR POTENTIAL WL COME DOWN TO THE STRENGTH OF THE SHRTWV
TORF AND EXACT TIMING OF THE FROPA. TOO EARLY YET TO MAKE THIS
DETERMINATION BUT THIS WL NEED TO BE WATCHED IN THE COMING DAYS.

HAVE MAINTAINED THE DRY FCST FOR EARLY NXT WEEK AS THE MEAN FLOW
TURNS NW OVR THE WRN GREAT LKS AND A BROAD AREA OF WEAK HI PRES
SETTLES OVR THE RGN. LESS HUMIDITY AND SLIGHTLY COOLER TEMPS ARE
EXPECTED.
&&

.AVIATION...MAINLY VFR CONDITIONS WILL PREVAIL TODAY. LATER TODAY
INTO TONIGHT AS A COLD FRONT TRACKS OVER THE STATE....THUNDERSTORMS
WILL SPREAD OVER THE AREA FROM WEST TO EAST...REACHING AUW...CWA
AND RHI BETWEEN 21Z AND 00Z...AND AFTER 01Z FOR ATW AND GRB. LARGE
HAIL AND DAMAGING WINDS POSSIBLE WITH THESE STORMS.
&&

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

TDH/KALLAS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GREEN BAY WI
929 AM CDT WED JUL 14 2010

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-151430-
VILAS-ONEIDA-FOREST-FLORENCE-NORTHERN MARINETTE-LINCOLN-LANGLADE-
MENOMINEE-NORTHERN OCONTO-DOOR-MARATHON-SHAWANO-WOOD-PORTAGE-
WAUPACA-OUTAGAMIE-BROWN-KEWAUNEE-WAUSHARA-WINNEBAGO-CALUMET-
MANITOWOC-SOUTHERN MARINETTE-SOUTHERN OCONTO-
929 AM CDT WED JUL 14 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH CENTRAL AND NORTHEAST
WISCONSIN.

.DAY ONE...TODAY AND TONIGHT

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS TODAY AND
TONIGHT. A CLUSTER OF THUNDERSTORMS ACROSS EASTERN MINNESOTA
AND NORTHWEST WISCONSIN WILL WORK INTO NORTH CENTRAL WISCONSIN
LATE THIS MORNING AND EARLY THIS AFTERNOON. SOME OF THESE STORMS
COULD BECOME SEVERE WITH DAMAGING WINDS AND LARGE HAIL LATE THIS
MORNING AND EARLY THIS AFTERNOON.

AS THE ATMOSPHERE BECOMES UNSTABLE THIS AFTERNOON...THUNDERSTORMS
WILL REDEVELOP DURING THE MID TO LATE AFTERNOON AHEAD OF A COLD
FRONT ACROSS WESTERN WISCONSIN AND THEN MOVE INTO NORTHEAST
WISCONSIN THIS EVENING. SOME OF THESE STORMS ARE LIKELY TO BECOME
SEVERE WITH DAMAGING WINDS AND LARGE HAIL. AN ISOLATED TORNADO IS
ALSO POSSIBLE. SOME OF THESE STORMS WILL BE CAPABLE OF PRODUCE
TORRENTIAL RAINS OF 1 TO 2 INCHES PER HOUR...CAUSING URBAN STREET
FLOODING AND PONDING OF WATER ON AREA ROADWAYS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THERE IS A CHANCE FOR THUNDERSTORMS SATURDAY NIGHT INTO SUNDAY. IT
IS TOO EARLY TO DETERMINE IF ANY OF THESE STORMS WILL BE SEVERE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION SHOULD BE EXPECTED THIS AFTERNOON AND EVENING.

LMZ521-522-541>543-151430-
THE BAY OF GREEN BAY SOUTH OF A LINE FROM CEDAR RIVER MI TO ROCK
ISLAND PASSAGE-LAKE MICHIGAN FROM WASHINGTON ISLAND TO SHEBOYGAN-
929 AM CDT WED JUL 14 2010

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST LAKE
MICHIGAN AND THE WATERS OF GREEN BAY.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS WILL WORK INTO NORTHEAST WISCONSIN LATE THIS
AFTERNOON AND EVENING. THERE IS A SLIGHT RISK OF SEVERE WEATHER
TONIGHT WITH STRONG WINDS THAT WILL BE ESPECIALLY HAZARDOUS FOR
SMALL CRAFTS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THERE IS A CHANCE FOR THUNDERSTORMS SATURDAY NIGHT INTO SUNDAY. IT
IS TOO EARLY TO DETERMINE IF ANY OF THESE STORMS WILL BE SEVERE.

ECKBERG

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
1116 AM CDT WED JUL 14 2010

WIZ005-010>012-018-019-141730-
VILAS-ONEIDA-FOREST-FLORENCE-LINCOLN-LANGLADE-
INCLUDING THE CITIES OF...EAGLE RIVER...RHINELANDER...CRANDON...
TOMAHAWK...ANTIGO
1116 AM CDT WED JUL 14 2010

...STRONG TO SEVERE THUNDERSTORMS APPROACHING THE AREA...

AT 1110 AM...DOPPLER RADAR INDICATED A LINE OF STRONG TO SEVERE
THUNDERSTORMS EXTENDING FROM NEAR ASHLAND SOUTHWARD TO LADYSMITH.
THIS LINE OF THUNDERSTORMS WAS MOVING TO THE EAST AT 55 MPH. THIS
LINE OF THUNDERSTORMS HAS A HISTORY OF PRODUCING WIDESPREAD WIND
DAMAGE TO TREES AND STRUCTURES.

THE THUNDERSTORMS WILL MOVE INTO WESTERN VILAS...WESTERN ONEIDA
AND NORTHWEST LINCOLN COUNTY BETWEEN 1130 AM AND NOON AND WORK INTO
LANGLADE AND FOREST COUNTIES BY 1 PM. DUE TO THE FAST MOVEMENT
AND SEVERITY OF THESE STORMS...BOATERS SHOULD SEEK SAFE SHELTER AS
SOON AS POSSIBLE. CAMPERS SHOULD ALSO SEEK STURDY SHELTER AWAY FROM
TREES. RESIDENTS OF NORTH CENTRAL WISCONSIN SHOULD STAY TUNE FOR
LATER WARNINGS AND STATEMENTS ON THIS PARTICULARLY DANGEROUS
SITUATION.

ECKBERG

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GREEN BAY WI
1219 PM CDT WED JUL 14 2010

WIZ030-035-036-141930-
MARATHON-WOOD-PORTAGE-
INCLUDING THE CITIES OF...WAUSAU...WISCONSIN RAPIDS...
STEVENS POINT
1219 PM CDT WED JUL 14 2010

...SEVERE THUNDERSTORMS APPROACHING CENTRAL WISCONSIN...

THUNDERSTORMS DEVELOPING OVER WEST CENTRAL WISCONSIN ARE EXPECTED
TO INTENSIFY AND TRACK INTO CENTRAL WISCONSIN EARLY THIS
AFTERNOON. AT THIS TIME...THE STRONGEST STORM IS EXPECTED TO
AFFECT MARATHON COUNTY...BRINGING DAMAGING WINDS AND TORRENTIAL
RAINFALL TO THE REGION BETWEEN 115 PM AND 230 PM.

PERSONS WITH OUTDOOR PLANS IN CENTRAL WISCONSIN SHOULD KEEP AN
EYE TO THE SKY...AND BE PREPARED TO TAKE COVER IF SEVERE
THUNDERSTORMS APPROACH.

A TORNADO WATCH IS IN EFFECT FOR THE AREA UNTIL 7 PM CDT.

WIZ011-012-019-141930-
FOREST-FLORENCE-LANGLADE-
INCLUDING THE CITIES OF...CRANDON...ANTIGO
1219 PM CDT WED JUL 14 2010

...THUNDERSTORMS WITH STRONG WINDS EXPECTED IN FAR NORTHEAST WISCONSIN...

A LINE OF SEVERE THUNDERSTORMS OVER THE WESTERN PORTIONS OF
VILAS...ONEIDA AND LINCOLN COUNTIES WILL CONTINUE TO TRACK EAST
EARLY THIS AFTERNOON. IF THESE STORMS MAINTAIN THEIR STRENGTH...THEY
WILL BRING WIND GUSTS TO 50 TO 60 MPH AND HEAVY RAINFALL TO
FLORENCE...FOREST AND LANGLADE COUNTIES BETWEEN 1 PM AND 2 PM.

PERSONS WITH OUTDOOR PLANS IN FAR NORTHEAST WISCONSIN SHOULD KEEP
AN EYE TO THE SKY...AND BE PREPARED TO TAKE COVER IF SEVERE
THUNDERSTORMS APPROACH.

A TORNADO WATCH IS IN EFFECT FOR THE AREA UNTIL 7 PM CDT.

KIECKBUSCH

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