Severe Thunderstorm Warning 74, NWS Grand Rapids, MI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
721 PM EDT SAT JUN 14 2008

LATEST UPDATE...AVIATION...

.SYNOPSIS...(322 PM EDT SAT JUN 14 2008)
A LARGE UPPER LOW OVER ONTARIO WILL PUSH A COLD FRONT THROUGH LOWER
MICHIGAN SUNDAY. STRONG TO SEVERE THUNDERSTORMS ARE POSSIBLE DURING
THE AFTERNOON AND EVENING HOURS. COOLER WEATHER WILL ARRIVE MONDAY.

&&

.SHORT TERM...(322 PM EDT SAT JUN 14 2008)
(TONIGHT THROUGH MONDAY NIGHT)
FORECAST CONCERNS DEAL WITH THE CONVECTIVE POTENTIAL TONIGHT AND
SUNDAY. LATEST VIS AND IR LOOPS SHOW TOWERING CU FIRING ALONG A
TROUGH FROM THE EASTERN UP SOUTHWEST THROUGH EASTERN WISCONSIN. MORE
CU WAS NOTED OVER NW LWR. LATEST MSAS DATA SHOWS LI/S AROUND -5C
OVER THE NW CWA. THE LIMITING FACTOR IS MOISTURE. 12Z RAOBS WERE
FAIRLY DRY. GIVEN THE WEAK TROUGH MOVING THROUGH AND A LACK OF
MOISTURE...TSRA COVERAGE WON/T BE GREAT. THE ATM WILL STABILIZE
AFTER SUNSET AND WE/LL REMOVE POPS OVERNIGHT.

THE COLD FRONT WILL PUSH INTO THE CWA SUNDAY. THE ATM WILL BE QUITE
A BIT MORE DYNAMIC SUNDAY THAN TONIGHT. INSTABILITY WILL AGAIN BE
HIGH WITH LI/S AROUND -6C. A 70KT MID LEVEL JET WILL CREATE 60KTS OF
SHEAR SUNDAY AFTERNOON. GIVEN THAT THE JET IS NORMAL TO THE
FRONT...THE FRONT SHOULD/T HAVE ANY PROBLEM MOVING THROUGH. THAT
WILL ALSO REDUCE THE POTENTIAL FOR TRAINING ECHOS. IT ALSO MEANS
CONVERGENCE WILL LIKELY BE GREATER AND THE THREAT FOR STRONG/SEVERE
STORMS WILL BE THERE. WIND DAMAGE WILL BE THE MAIN THREAT. SOME OF
THE RAIN COULD BE HEAVY AGAIN...ESPECIALLY ACROSS THE SRN CWA. PWAT
VALUES WILL CLIMB UP TO 1.8 IN AS A 40-50KT LLJ MOVES OVER THE CWA.

DRIER AND MUCH COOLER WX WILL FLOW INTO THE REGION MONDAY. H8 TEMPS
ARE PROGD TO FALL TO AROUND 4C. MUCH OF THE CWA WILL SEE TEMPS IN
THE 60S.

&&

.LONG TERM...(322 PM EDT SAT JUN 14 2008)
(TUESDAY THROUGH SATURDAY)
BY TUESDAY AN UPPER LOW WILL BE OVER SOUTHERN QUEBEC.  THIS FEATURE
IS EXPECTED TO REMAIN NEARLY STATIONARY THROUGH MUCH OF THE WORK
WEEK...GRADUALLY FILLING IN AND FADING AWAY BY FRIDAY OR FRIDAY
NIGHT.  THE FLOW AROUND THE LOW WILL KEEP THE AREA CHILLY FOR THIS
TIME OF YEAR.  DAYTIME HIGHS ON TUESDAY WILL ONLY BE IN THE 65 TO 70
DEGREE RANGE.  WITH THE LOW WEAKENING THROUGH THE WEEK IT WILL HAVE
LESS INFLUENCE ON THE REGION AND TEMPS WILL SLOWLY MODERATE EACH DAY.

AS FOR PCPN CHANCES...IT LOOKS RATHER DRY THROUGH MUCH OF THE
EXTENDED PERIOD.  HIGH PRESSURE GRADUALLY BUILDS INTO THE REGION
BEHIND THE WEAKENING UPPER LOW AND WILL STICK AROUND THROUGH THE
MIDDLE OF THE WEEK.  A WARM FRONT DEVELOPS TOWARD THE END OF THE
WEEK AND COULD BE THE FOCUS FOR SCATTERED DAYTIME THUNDERSTORMS.
HAVE INCLUDED THE CHANCE FOR THIS BOTH FRIDAY AND SATURDAY...HOWEVER
THE CHANCES STILL DO NOT LOOK ALL THAT IMPRESSIVE.

&&

.MARINE...(322 PM EDT SAT JUN 14 2008)
WEST WINDS 10-20KTS AND COLD WATER TEMPS WILL LIKELY RESULT IN WAVES
JUST BELOW SCA CRITERIA TONIGHT AND SUNDAY.

&&

.AVIATION...(721 PM EDT SAT JUN 14 2008)
ISOLATED SHOWERS OR THUNDERSTORMS WILL AFFECT MKG THIS EVENING AND
MAY ALSO AFFECT GRR...BUT THESE SHOULD DIE OUT AFTER SUNSET. THEN
EXPECT VFR OVERNIGHT BEFORE MORE THUNDERSTORMS FORM SUNDAY MORNING
AS THE ATMOSPHERE BECOMES UNSTABLE. EXPECT THUNDERSTORMS...SOME
HEAVY...FROM LATE MORNING THROUGH THE AFTERNOON.

&&

.HYDROLOGY...(322 PM EDT SAT JUN 14 2008)
LATEST INFO FROM EMERGENCY MANAGEMENT CONTINUES TO SHOW ROADS WASHED
OUT AND WATER OVER ROADS. A COUPLE OF ROADS THAT NOW HAVE WATER OVER
THEM DID NOT HAVE WATER OVER THEM FRIDAY. SO THE RUNOFF FROM THE
TORRENTIAL RAINS A DAY OR SO AGO CONTINUE TO RUN OFF. THE PERE
MARQUETTE AT SCOTTVILLE IS ALSO SLOWLY RISING AND WILL BE ABOVE
FLOOD STAGE UNTIL WEDNESDAY. SINCE SHOWERS AND THUNDERSTORMS ARE
POSSIBLE LATE TONIGHT AND SUNDAY...FLOODING WILL LIKELY CONTINUE.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...NONE.
LM...NONE.

&&

SYNOPSIS:     93
SHORT TERM:   93
LONG TERM:    JK
MARINE        93
AVIATION:     OSTUNO
HYDROLOGY:    93

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
511 AM EDT SAT JUN 14 2008

MIZ037>040-043>046-050>052-056>059-064>067-071>074-150830-
MASON-LAKE-OSCEOLA-CLARE-OCEANA-NEWAYGO-MECOSTA-ISABELLA-MUSKEGON-
MONTCALM-GRATIOT-OTTAWA-KENT-IONIA-CLINTON-ALLEGAN-BARRY-EATON-
INGHAM-VAN BUREN-KALAMAZOO-CALHOUN-JACKSON-
511 AM EDT SAT JUN 14 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST LOWER
MICHIGAN.

.DAY ONE...TODAY AND TONIGHT

SIGNIFICANT FLOODING CONTINUES ACROSS MUCH OF MASON... LAKE
AND OSCEOLA COUNTIES. RIVERS AND STREAMS ARE AT ELEVATED LEVELS AND
MANY ROADS REMAIN CLOSED DUE TO WASHOUTS OR STANDING WATER.

THUNDERSTORMS ARE POSSIBLE TONIGHT. SOME OF THE STORMS THIS EVENING
COULD BE STRONG WITH GUSTY WINDS TO 50 MPH AND HALF INCH DIAMETER
HAIL. STORM MOVEMENT WILL BE TO THE SOUTHEAST AT AROUND 30 MPH.

THE GOOD NEWS IS THAT HEAVY RAIN IS NOT ANTICIPATED AND ANY STORMS
THAT DEVELOP TONIGHT WILL HAVE VERY LITTLE IMPACT ON THE CURRENT
FLOODING SITUATION. RAINFALL AMOUNTS SHOULD BE MOSTLY LESS THAN ONE
QUARTER OF AN INCH.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SEVERE THUNDERSTORMS WITH DAMAGING WINDS AND LARGE HAIL ARE POSSIBLE
SUNDAY AFTERNOON AND EVENING. AGAIN...HEAVY RAIN DOES NOT APPEAR TO
BE A SIGNIFICANT THREAT WITH THESE STORMS.

NO HAZARDOUS WEATHER IS EXPECTED MONDAY THROUGH FRIDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED SUNDAY.

LMZ844>849-150830-
ST JOSEPH TO SOUTH HAVEN MI-SOUTH HAVEN TO HOLLAND MI-
HOLLAND TO GRAND HAVEN MI-GRAND HAVEN TO WHITEHALL MI-
WHITEHALL TO PENTWATER MI-PENTWATER TO MANISTEE MI-
511 AM EDT SAT JUN 14 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST LOWER
MICHIGAN.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS ARE POSSIBLE TONIGHT. SOME OF THE STORMS THIS EVENING
COULD BE STRONG WITH GUSTY WINDS TO 50 MPH AND HALF INCH DIAMETER
HAIL. STORM MOVEMENT WILL BE TO THE SOUTHEAST AT AROUND 30 MPH.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

SEVERE THUNDERSTORMS WITH DAMAGING WINDS AND LARGE HAIL ARE POSSIBLE
SUNDAY AFTERNOON AND EVENING.

WINDS AND WAVES HAZARDOUS TO SMALL CRAFT ARE POSSIBLE MONDAY AND
TUESDAY... BEHIND THE STRONG COLD FRONT WHICH PASSES THROUGH THE
REGION SUNDAY NIGHT.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED SUNDAY.

MEADE

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
751 PM EDT SAT JUN 14 2008

MIZ037-038-043-044-150045-
LAKE-MASON-NEWAYGO-OCEANA-
751 PM EDT SAT JUN 14 2008

...SPECIAL WEATHER STATEMENT...

AT 746 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
RAPIDLY DEVELOPING THUNDERSTORM 8 MILES NORTHWEST OF PENTWATER...
MOVING EAST AT 45 MPH.

* LOCATIONS IN THE PATH OF THE STORM INCLUDE...

  PENTWATER...          LUDINGTON...          SCOTTVILLE...
  CUSTER...             WALHALLA...           BRANCH...
  BALDWIN...

THIS STORM IS CAPABLE OF PRODUCING UP TO DIME SIZE HAIL...OCCASIONAL
CLOUD TO GROUND LIGHTNING...AND BRIEF DOWNPOURS. STAY AWAY FROM HIGH
OBJECTS OUTDOORS SUCH AS TREES. SEEK SHELTER IN A STURDY STRUCTURE
UNTIL THIS STORM HAS PASSED.

LAT...LON 4403 8587 4381 8583 4377 8646 4383 8645
      4384 8646 4389 8646 4390 8647 4396 8647
TIME...MOT...LOC 2351Z 260DEG 39KT 4386 8650

OSTUNO

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
755 PM EDT SAT JUN 14 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0748 PM     HAIL             HART                    43.70N 86.36W
06/14/2008  M0.50 INCH       OCEANA             MI   TRAINED SPOTTER

            HAIL RANGED FROM PEA TO DIME SIZE.

&&

HOVING

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
803 PM EDT SAT JUN 14 2008

MIZ038-043-044-150045-
LAKE-NEWAYGO-OCEANA-
803 PM EDT SAT JUN 14 2008

...SPECIAL WEATHER STATEMENT...

AT 800 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR WALKERVILLE...MOVING EAST AT 45 MPH.

* LOCATIONS IN THE PATH OF THE STORM INCLUDE...

  WALKERVILLE...        WOODLAND PARK...      BITELY...
  HAWKINS...

THIS STORM IS CAPABLE OF PRODUCING UP TO DIME SIZE HAIL...OCCASIONAL
CLOUD TO GROUND LIGHTNING...AND BRIEF DOWNPOURS. STAY AWAY FROM HIGH
OBJECTS OUTDOORS SUCH AS TREES. SEEK SHELTER IN A STURDY STRUCTURE
UNTIL THIS STORM HAS PASSED.

LAT...LON 4389 8557 4374 8556 4368 8615 4376 8618
TIME...MOT...LOC 0003Z 258DEG 39KT 4372 8608

OSTUNO

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
821 PM EDT SAT JUN 14 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0810 PM     HAIL             3 N LUDINGTON           44.00N 86.44W
06/14/2008  M1.00 INCH       MASON              MI   TRAINED SPOTTER

            MEASURED NEAR THE TWIN BRIDGES AT HAMLIN LAKE.

&&

HOVING

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