Severe Thunderstorm Warning 92, NWS Marquette, MI

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE MARQUETTE MI
1130 PM EDT MON AUG 27 2007

.SHORT TERM (TONIGHT AND TUESDAY)...

TAKING A LOOK AT THE REGIONAL WEATHER MAP THIS AFTERNOON...THE MAIN
SURFACE LOW REMAINS OVER CENTRAL AND EASTERN PORTIONS OF SOUTH
DAKOTA.  OUT AHEAD OF THIS FEATURE...A SHORTWAVE THAT WAS OVER
CENTRAL MINNESOTA THIS MORNING HAS SLID EASTWARD AND OVER CENTRAL
UPPER MICHIGAN.  THIS SHORTWAVE HAD BROUGHT PLENTY OF CLOUDS TO OUR
REGION...BUT ONCE AGAIN LITTLE IN THE WAY OF MEASURABLE
PRECIPITATION.  AFTER THE PASSAGE OF THIS WAVE...SKIES HAVE BEEN
ABLE TO CLEAR AND TEMPERATURES HAVE BEEN ABLE TO SKYROCKET INTO THE
LOWER 80S.  GUSTY WINDS WITH GUSTS IN THE 20 TO 25 MPH RANGE HAVE
BEEN COMMON.

THE TIMING OF PRECIPITATION IS TRICKY TONIGHT AND TUESDAY...WITH
SOME MINOR TIMING DIFFERENCES.  HAVE INCREASE THE COVERAGE OF LIKELY
POPS...BUT STILL KEEP THEM ACROSS THE LAKE SUPERIOR ZONES...AND
WESTERN BAND OF COUNTIES.

FOR TUESDAY AFTERNOON...EXPECTING A SLIGHTLY SLOWER FRONTAL
PASSAGE...HAVE WARMED TEMPERATURES UP SLIGHTLY ACROSS THE FAR
SOUTHEASTERN TO EASTERN COUNTIES.  OTHERWISE...FEW CHANGES WERE MADE
TO THE ONGOING FORECAST.

&&

.LONG TERM (TUESDAY NIGHT THROUGH MONDAY)...

FCST FOR TUE NGT/WED WL HINGE ON HOW QUICKLY COLD FNT CAN SHIFT ACRS
THE UPR GRT LKS IN WSW FLOW ALF AND TRACK OF ANY LO PRES WAVE THAT
WL RIDE THIS BNDRY INTO THE GRT LKS. 12Z NAM/CNDN MODELS SUG THIS
FNT WL BE MORE PROGRESSIVE WITH NRN BRANCH FLOW TURNING MORE
ZONAL...SO THAT SHRTWVS TRACKING NEWD FM THE CNTRL PLAINS ALG THIS
BNDRY WL GET SHEARED OUT FASTER. THE RESULT IS A WEAKER FNTL LO PRES
WAVE AND QUICKER DRYING ACRS THE CWA. THE 12Z GFS ON THE OTHER HAND
MAINTAINS A BIT MORE OF A SW FLOW ALF WITH SLOWER NRN BRANCH
PROGRESSION...WITH SOME RRQ DYNAMICS IN SW-NE ORIENTED H3 JET OVER
ONTARIO HELPING TO ENHANCE ENUF UPR DVGC/SFC LO DVLPMNT ON THE BNDRY
TO RESULT IN A MORE WDSPRD SHRA EVENT TUE NGT/WED MRNG OVER MAINLY
THE CNTRL AND ERN COUNTIES. 12Z UKMET SEEMS TO BE A NICE COMPROMISE
BTWN THE 2 CAMPS...SO WL TEND TOWARD THAT GUIDANCE PER NCEP HINT OF
A COMPROMISE. SO CARRIED A CHC OF SHRA/TSRA TUE EVNG BEFORE UKMET
SHOWS SFC LO LIFTING TO THE NE AND DRIER AIR INVADING THE CWA TUE
NGT...HIEST POPS TOWARD THE SE ZNS...WHERE A 20 POP IS WARRNATED
THRU 12Z WED.

LOOK FOR A DRY PD WED INTO THU WITH CNDN HI PRES BLDG INTO THE UPR
LKS. GFS/NAM MOS GUIDANCE IS FAIRLY SIMILAR AND IN REASONABLE
AGREEMENT WITH MIXING TO H8 OR SO ON GFS FCST SDNGS FOR WED MAX
TEMPS...BUT LOWERED READINGS A BIT FOR HIER TERRAIN DOWNSTREAM OF LK
SUP. COOLEST NGT OF THE WEEK LOOKS TO BE WED NGT. TENDED AOB MOS
GUIDANCE OVER THE INTERIOR W HALF WITH COOLER LOCATIONS DROPPING TO
ARND 40 WITH HI PRES CENTER BLDG INTO NW WI AND CORE OF DRIER AIR
PASSING INTO THE UPR LKS (NAM/GFS FCST PWAT AOB 0.5 INCH). HI TEMPS
ON THU SHOULD REBOUND NICELY IN THE AFTN AS H85 TEMPS RISE TO 10-12C
OVER THE W. MUCH UNCERTAINTY REMAINS REGARDING TRACK OF NEXT SHRTWV
IN NW FLOW ALF IN THU NGT/FRI TIMEFRAME. MAJORITY OF EARLIER
GUIDANCE SHOWED THIS SYS MOVING THRU ONTARIO...WITH DRY AIRMASS IN
PLACE ALLOWING FOR NOTHING MORE THAN SCT CLDS ON THU NGT/FRI TO THE
S OF BETTER DYNAMICS STAYING TO THE N. 12Z GFS HAS THROWN A CURVE
BALL BY DEPICTING A MORE DIGGING SHRTWV AND EVEN SOME SHRA OVER THE
NW ZNS. SINCE PREVIOUS FCST WAS DRY AND 12Z ECMWF SHOWS THE FARTHER
N TRACK...WL STICK WITH THE DRY IDEA FOR NOW UNTIL GUIDANCE COMES
INTO BETTER AGREEMENT TO WARRANT A CHG.

LOOK FOR A DRY WARM UP FOR AT LEAST THE BEGINNING OF LABOR DAY
WEEKEND WITH ACYC SW FLOW DOMINATING OVER THE UPR LKS ONCE SFC HI
CENTER BLDS INTO NEW ENGLAND ON SAT. THERE ARE TIMING DIFFERENCES ON
THE PASSAGE OF NEXT COLD FNT LATE NEXT WEEKEND...SO WL FOLLOW NCEP
MANUAL GUIDANCE/00Z GFS ENSEMBLE MEAN SHOWING THIS FROPA LATE SUN
WITH SHRA/TSRA CHCS ON THAT DAY. AFT SOME LINGERING SCHC POPS EARLY
MON...WENT DRY AND COOLER BY THE AFTN WITH NEXT CNDN HI PRES BLDG
TOWARD THE UPR LKS.

COORDINATED WITH NCEP/GRB/LOT/APX.

&&

.AVIATION (FOR THE 00Z TAF ISSUANCE)...

PRESENCE OF LOW-LEVEL JET WILL AGAIN REQUIRE LLWS MENTION FOR KSAW.
AMENDED KCMX TAF TO INCLUDED TEMPO GROUPS FOR TSRA AND LOWER MVFR
CIGS BETWEEN 04Z AND 11Z AS CONVECTION OVER MN IS NOW SAGGING SE
TOWARD THE WRN U.P. OTHERWISE...EXPECT SHRA TO GENERALLY TAPER OFF
AT KCMX AFT 12Z WITH DRYING TO OCCUR BY MIDDAY. BETTER CHC FOR
CONVECTION AT KSAW WILL BE LATE AFTERNOON TUE AS COLD FRONT
APPROACHES SO HAVE INCLUDED A PROB30 GROUP BTWN 20Z AND 24Z.

&&

.MARINE (FOR THE 4 PM LAKE SUPERIOR FORECAST ISSUANCE)...

WINDS WILL INCREASE AGAIN OVER THE EASTERN PART OF THE LAKE TONIGHT
AS A WEAK SFC LOW TRACKS ALONG THE COLD FRONT OVER WESTERN LAKE
SUPERIOR. SUSTAINED WINDS SHOULD INCREASE TO 20-25KT WITH FREQUENT
GUSTS TO AROUND 30KT...ESPECIALLY AT THE HIGHER OBSERVING PLATFORMS
SUCH AS STANNARD ROCK. ANOTHER AREA TO WATCH FOR LOCALLY STRONGER
WINDS WILL BE AT THE E END OF PICTURED ROCKS NATIONAL LAKESHORE
(AROUND GRAND MARAIS) AS SOUTHERLY WINDS ARE TYPICALLY ENHANCED
THERE. NOT OUT OF THE QUESTION TO SEE SOME GALE FORCE GUSTS THERE AT
TIMES. COLD FRONT WILL REACH WESTERN LAKE SUPERIOR LATE TONIGHT AND
EXIT THE E PART OF THE LAKE TUESDAY AFTERNOON. AT THIS TIME...IT
DOES NOT APPEAR THAT WINDS WILL EXCEED 20KT AFTER THE COLD FRONT
PASSES. WINDS SHOULD REMAIN UNDER 20KT WED THRU FRI AS HIGH PRES
BUILDS FROM THE NORTHERN PLAINS TO THE GREAT LAKES.

&&

.MQT WATCHES/WARNINGS/ADVISORIES...NONE.

&&

SHORT TERM...KF
LONG TERM...KC
AVIATION...JV
MARINE...KF

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MARQUETTE MI
433 PM EDT MON AUG 27 2007

MIZ001>007-009>014-084-085-281200-
KEWEENAW-ONTONAGON-NORTHERN HOUGHTON-BARAGA-MARQUETTE-ALGER-LUCE-
GOGEBIC-IRON-DICKINSON-MENOMINEE-DELTA-SOUTHERN SCHOOLCRAFT-
SOUTHERN HOUGHTON-NORTHERN SCHOOLCRAFT-
433 PM EDT MON AUG 27 2007 /333 PM CDT MON AUG 27 2007/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WESTERN UPPER
MICHIGAN AND CENTRAL UPPER MICHIGAN.

.DAY ONE...TONIGHT

THERE IS A CHANCE OF THUNDERSTORMS ACROSS WESTERN UPPER MICHIGAN
THIS EVENING AND THEN ACROSS ALL OF WEST AND CENTRAL UPPER
MICHIGAN LATE TONIGHT. THE MAIN THREAT FROM ANY STORM THAT
DEVELOPS WILL BE LOCALLY HEAVY RAIN AND CLOUD TO GROUND LIGHTNING
THAT MIGHT START A WILDFIRE.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

LOOK FOR A CHANCE OF THUNDERSTORMS ACROSS ALL OF WEST AND CENTRAL
UPPER MICHIGAN ON TUESDAY AND TUESDAY EVENING. THE THREAT OF
THUNDERSTORMS WILL PERSIST SOUTH AND EAST OF A LINE FROM SENEY TO
IRON MOUNTAIN LATE TUESDAY NIGHT. THERE IS A SLIGHT CHANCE SOME OF
THE STORMS SOUTH OF A LINE FROM IRON MOUNTAIN TO MANISTIQUE
TUESDAY AND TUESDAY EVENING COULD TURN SEVERE AND CAUSE DAMAGING
WINDS AND LARGE HAIL.

THERE IS A CHANCE OF THUNDERSTORMS AGAIN SUNDAY AFTERNOON OVER THE
WEST HALF AND SUNDAY EVENING OVER ALL OF WEST AND CENTRAL UPPER
MICHIGAN.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

LSZ221-241>248-263-264-281200-
KEWEENAW BAY AND HURON BAY FROM LOWER ENTRANCE LIGHT TO PORTAGE
LAKE TO HURON ISLANDS MI-SAXON HARBOR WI TO ONTONAGON MI-
ONTONAGON TO UPPER ENTRANCE OF PORTAGE CANAL MI-
UPPER ENTRANCE OF PORTAGE CANAL TO MANITOU ISLAND MI-
MANITOU ISLAND TO LOWER ENTRANCE OF PORTAGE CANAL MI-
HURON ISLANDS TO MARQUETTE MI-MARQUETTE TO MUNISING MI-
MUNISING TO GRAND MARAIS MI-GRAND MARAIS TO WHITEFISH POINT MI-
LAKE SUPERIOR, EAST OF A LINE FROM SAXON HARBOR WI TO GRAND
PORTAGE, MN, TO A LINE NORTHWARD FROM MANITOU IS. MI, BEYOND 5 NM
AND SOUTH OF THE US/CANADIAN BORDER-
LAKE SUPERIOR, EAST OF A LINE FROM MANITOU IS. MI NORTHWARD
BEYOND 5 NM AND SOUTH OF THE US/CANADIAN BORDER, EXCLUDING
WHITEFISH BAY-
433 PM EDT MON AUG 27 2007 /333 PM CDT MON AUG 27 2007/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF EASTERN LAKE
SUPERIOR...CENTRAL LAKE SUPERIOR AND WESTERN LAKE SUPERIOR.

.DAY ONE...TONIGHT

EXPECT A CHANCE OF THUNDERSTORMS ACROSS ALL OF LAKE SUPERIOR
TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THERE IS A CHANCE OF THUNDERSTORMS ACROSS ALL OF LAKE SUPERIOR ON
TUESDAY AND THEN ACROSS JUST THE EAST HALF ON TUESDAY EVENING.

THE THREAT OF THUNDERSTORMS WILL RETURN ON SUNDAY MORNING OVER
THE WEST HALF OF LAKE SUPERIOR AND ACROSS THE ENTIRE LAKE BY
SUNDAY EVENING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

LMZ221-248-262-281200-
BAY OF GREEN BAY NORTH OF LINE FROM CEDAR RIVER MI TO ROCK ISLAND
PASSAGE-SEUL CHOIX POINT TO POINT DETOUR MI-
LAKE MICHIGAN...FROM SEUL CHOIX POINT TO ROCK ISLAND
PASSAGE...SOUTHEASTWARD BEYOND 5 NM OFF SHORE TO THE MID-
LINE OF THE LAKE-
433 PM EDT MON AUG 27 2007

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHERN LAKE
MICHIGAN.

.DAY ONE...TONIGHT

EXPECT A CHANCE OF THUNDERSTORMS LATE TONIGHT.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

THERE IS A CHANCE OF THUNDERSTORMS TUESDAY AND TUESDAY NIGHT AND
THEN AGAIN ON SUNDAY EVENING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

KC

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MARQUETTE MI
1236 AM EDT TUE AUG 28 2007

MIZ002-009-280545-
GOGEBIC-ONTONAGON-
1236 AM EDT TUE AUG 28 2007

...SIGNIFICANT WEATHER ALERT FOR GOGEBIC AND ONTONAGON COUNTIES UNTIL
145 AM EDT (1245 AM CDT)...

AT 1233 AM EDT (1133 PM CDT)...NATIONAL WEATHER SERVICE DOPPLER RADAR
WAS TRACKING STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 35
MILES NORTHWEST OF IRONWOOD TO 36 MILES NORTHWEST OF PARK FALLS.
THESE STORMS WERE MOVING EAST AT 40 MPH.

WINDS UP TO 50 MPH AND FREQUENT CLOUD TO GROUND LIGHTNING STRIKES
ARE EXPECTED WITH THESE STORMS. PEA SIZED HAIL MAY ALSO OCCUR.

* LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
  LITTLE GIRLS POINT.
  COPPER PEAK.
  LAKE OF THE CLOUDS.
  IRONWOOD.
  WAKEFIELD.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL
TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS
CONCERNING THIS WEATHER SITUATION.

JLA

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MARQUETTE MI
1249 AM EDT TUE AUG 28 2007

MIZ003-004-084-280515-
BARAGA-NORTHERN HOUGHTON-SOUTHERN HOUGHTON-
1249 AM EDT TUE AUG 28 2007

...SIGNIFICANT WEATHER ALERT FOR BARAGA AND HOUGHTON COUNTIES UNTIL
115 AM EDT...

AT 1246 AM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 17 MILES NORTHEAST
OF ONTONAGON TO 18 MILES WEST OF BARAGA. THESE STORMS WERE MOVING
NORTHEAST AT 40 MPH.

PEA SIZE HAIL AND WINDS UP TO 50 MPH ARE EXPECTED WITH THESE STORMS.

* LOCATIONS IN OR NEAR THE PATH OF THESE STORMS INCLUDE...
  WINONA.
  ALSTON.
  FREDA.
  REDRIDGE.
  KEWEENAW BAY.
  HANCOCK.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO...OR YOUR LOCAL
TELEVISION STATIONS FOR LATER STATEMENTS AND POSSIBLE WARNINGS
CONCERNING THIS WEATHER SITUATION.

VOSS