Severe Thunderstorm Warning 88, NWS Grand Rapids, MI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
1143 AM EDT WED JUN 24 1998

PLENTY OF INSTABILITY ACROSS SOUTHERN LOWER ONCE AGAIN THIS AFTERNOON...
WITH TEMPERATURES AROUND 90 AND DEW POINTS IN THE LOWER 70S PUSHING
CAPE VALUES TOWARD 4000 J/KG.  14Z SURFACE MAP SHOWS WELL DEFINED
OUTFLOW BOUNDARY AND MESOHIGH DRAPED ACROSS CENTRAL LOWER MICHIGAN.
ACTUAL WARM FRONT APPEARS TO BE NORTH OF FORECAST AREA...SO WILL
LOOK TO CONVECTIVE BOUNDARIES AND POSSIBLE LAND/LAKE INTERACTION TO
FOCUS AFTERNOON THUNDERSTORM DEVELOPMENT.  LOW AND MID LEVEL WIND
MAXIMA PROGGED ACROSS SOUTHERN LOWER THIS AFTERNOON AS WELL...WITH
0-6KM SHEAR VALUES OF 30 M/S COMBINED WITH HIGH INSTABILITES AND A
STRONG MID LEVEL DRY PUNCH ENHANCING SEVERE WEATHER POTENTIAL. 12Z
DTX SOUNDING DID SHOW A MID LEVEL CAPPING INVERSION...WHICH SHOULD
BE OVERCOME BY HEATING AND UPPER SUPPORT PROVIDED BY VORTICITY MAX
EXPECTED TO MOVE INTO NORTHERN LOWER THIS EVEbNING. ONLY REAL CHANGE
TO FORECAST WILL BE TO REMOVE MORNING REFERENCES AND ADJUST THE WINDS
A BIT.

BORIS

MIZ037>040-043>046-050>052-056>059-064>067-071>074-260800-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
249 AM EDT FRI JUN 26 1998

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS CLEARED PORTIONS OF
SEVERE THUNDERSTORM WATCH 671 FOR PARTS OF SOUTHWEST LOWER MICHIGAN.
THE FOLLOWING COUNTIES HAVE BEEN CLEARED FROM THE WATCH:

IN WEST CENTRAL LOWER MICHIGAN:
LAKE               MASON              MUSKEGON
NEWAYGO            OCEANA

IN CENTRAL LOWER MICHIGAN:
CLARE              GRATIOT            ISABELLA
MECOSTA            MONTCALM           OSCEOLA

IN SOUTHWEST LOWER MICHIGAN:
ALLEGAN            BARRY              KALAMAZOO
KENT               OTTAWA             VAN BUREN

IN SOUTH CENTRAL LOWER MICHIGAN:
CALHOUN            CLINTON            EATON
INGHAM             IONIA              JACKSON

SOME WIDELY SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE FOR THE
REMAINDER OF THE NIGHT. ANY STORMS THAT DO DEPVELOP SHOULD REMAIN BELOW
SEVERE LEVELS.

MWH

MIZ037>040-043>046-050>052-056>059-064>067-071>074-260800-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GRAND RAPIDS MI
249 AM EDT FRI JUN 26 1998

THE NATIONAL WEATHER SERVICE IN GRAND RAPIDS HAS CLEARED PORTIONS OF
SEVERE THUNDERSTORM WATCH 671 FOR PARTS OF SOUTHWEST LOWER MICHIGAN.
THE FOLLOWING COUNTIES HAVE BEEN CLEARED FROM THE WATCH:

IN WEST CENTRAL LOWER MICHIGAN:
LAKE               MASON              MUSKEGON
NEWAYGO            OCEANA

IN CENTRAL LOWER MICHIGAN:
CLARE              GRATIOT            ISABELLA
MECOSTA            MONTCALM           OSCEOLA

IN SOUTHWEST LOWER MICHIGAN:
ALLEGAN            BARRY              KALAMAZOO
KENT               OTTAWA             VAN BUREN

IN SOUTH CENTRAL LOWER MICHIGAN:
CALHOUN            CLINTON            EATON
INGHAM             IONIA              JACKSON

SOME WIDELY SCATTERED SHOWERS AND THUNDERSTORMS ARE POSSIBLE FOR THE
REMAINDER OF THE NIGHT. ANY STORMS THAT DO DEPVELOP SHOULD REMAIN BELOW
SEVERE LEVELS.

MWH