Severe Thunderstorm Warning 24, NWS Marquette, MI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MARQUETTE MI
407 PM EDT THU MAY 30 2002

MAIN FCST CONCERNS ARE SHRA/TSRA COVERAGE/TIMING/STRENGTH THIS
EVENING AND WNDS FOR FRI.

WV IMAGERY SHOWING A CUTOFF LOW OVR LA WITH A BROAD RDG OVR FOUR
CORNERS. A SHRTWV IS ROTATING THRU A LOW OVR S SASK AND S ONT.
ANOTHER SHRTWV IS SLAMING ASHORE OVR PAC NW. SFC ANLYS SHOWING A LOW
OVR NW ONT...WITH A CDFNT STRETCHING FM THIS LOW THRU KDLH AREA...SW
TO KFSD. A BROAD LOW IS ALSO OVR SW STATES. A BROAD RDG COVER MOST
OF SE CONUS.

MDLS IN A FAIRLY GOOD AGREEMENT WITH MINOR INCONSISTENCE IN SPEED
AND STRENGTH OF SYS. CAN/AVN SLIGHT SLOWER AND DEEPER THAN ETA. THE
DIFFERENCE ARE MINOR SO WILL USE COMPROMISE THE SOLN.

SCT TSRA WILL SPREADING INTO THE EVE HRS. 305K ISENTROPIC ANLYS
SHOWING UPSLOPE FLOW ACRS CWA THIS EVE AHD OF APCH CDFNT. BY 06Z ETA
INDC A STRONG SHRTWV MOV THRU E PART OF FCST AREA THIS EVE ASSOC
WITH FRNT...FOLLOWED CLOSELY BY A WEAKER SHRTWV WHICH WILL SWING
ACRS LK SUPERIOR. THE CDFNT WILL SWING THRU CWA BTWN 00Z AND 06Z.
DRY CAA INTO FCST AREA OVRNGT BHD THE FNT WILL STABILIZE AMS. THUS
WILL KEEP MENTION OF SCT TSRA...SOME MAY BECOME SVR...FOR THE EVE.
TRAJ FCST INDC AMS OVR W ONT WILL MOV INTO CWA OVRNGT. OVRNGT LOW
THIS MRNG IN W ONT WERE IN THE MID 50S. ISENTROPIC ANLYS SHOWING
SOME OF THE STRONGER WNDS WILL MIX TO SFC AS WELL. THUS WILL INCR
WNDS A BIT OVRNGT AND LOW TO MID 50S LOOK REASONABLE FOR TNGT.

A LOW LVL JET BEHIND THE CDFNT WILL BE OVR CWA ON FRI. DRY AIR WILL
BRING SUNSHINE TO CWA ON FRI. THIS IN TURN WILL EROSE THE SFC BASE
INVRN AND LOW MORE OF THE LOW LVL JET TO MIX TO SFC. THIS IS FURTHER
SUPPORTED BY THE ISENTROPIC ANLY SHOWING MAINLY DOWNSLOPE FLOW ACRS
THE AREA ON FRI. THUS MOSTLY SUNNY AND BREEZY SOUND REASONABLE FOR
FRI INTO FRI NGT. THE STRONG WNDS WILL MIX THE LOW LVL ENOUGH TO
LIMIT RADIATIONAL COOLING. A SHRTWV WILL MOV THRU THE FCST AREA FRI
NGT ...HOWEVER WITH THE DRY COND DO NOT XPC ANY PCPN OR TSRA. XPC
CONT BREEZY.

A WEAK SHRTWV WILL MOV THRU CWA ON SAT. Q-VEC SHOWING SUFFICIENT
CONVERGENCE TO SUPPORT TSRA DVLP. AN UPR LVL JET WILL BE OVR CWA ON
SAT ESCORTING A POCKET OF MST AIR ACRS THE FCST AREA. XPC ENOUGH SFC
HEATING WILL BRING TEMPS UPTO MID 60 TO ARND 70. THIS SHOULD BE
ENOUGH TO GENERATE A FEW LAKE BREEZY BOUNDARY AND TO TRIGGER A FEW
TSRA ON SAT.

LOOKING AHEAD...EXTD MDLS WERE IN FAIR AGREEMENT. IN THE UPR
LVLS...ETA/CAN IN CLOSE AGREEMENT POSITION AND STRENGTH OF SYS ACRS
S TEIR OF CONUS...WHILE AVN/CAN/WSETA/ECWMF INDCT BEST AGREEMENTS
WITH SYS ACRS N TEIR STATES. WILL FAVOR THE LATER GROUPING FOR EXTD.
SFC ANLYS SHOWING MLDS IN GOOD AGREEMENT AS WELL.

FOR SAT NGT...A DEEP LOW IS OVR HUDSON BAY. UPR LVL JET WILL BE OVR
CNTRL ONT AND S CNTRL CAN. SFC RDG WILL BE OVR FCST AREA...AND AMS
DRY WITH MEAN SFC-500MB RH >40 PCT. A BROAD LOW PRES SYS WILL BE OVR
N PLAINS. Q-VEC CONVERGENCE AND SHRTWVW WILL PASS QUICKLY AND BY THE
EVE HRS THE AMS WILL AGAIN STABILIZE AND SAT NGT SHOULD BE QUIET.
SHRTWV ENERGY AHD OF THIS LOW WILL MOV INTO CWA BY LATE SUN. MEAN
SFC-500MB WILL INCR TO 80 PCT OF W U.P. UPR LVL JET MAX WILL REMAIN
OVR S ONT. A FNTL SYS WILL STRETCH ACRS S WI INTO THE OH VALLEY. CYC
FLOW ARND N PLAINS LOW WILL DRY MSTR INTO FCST AREA ON SUN...AND
POSSIBLY SET OFF A FEW SHRA. AVN FCST SOUNDINGS SHOWING VRY DRY BLO
700MB...AND 850-500MB LAPSE RATES OF ONLY 3C/KM...NOT VERY CONDUCIVE
FOR TSRA DVLPMNT. HOWEVER...WITH NR SATURATED COND BLO 700MB AND
WITH SHRTWV ENERGY AVAILABLE...THERE IS STILL A CHC OF SHRA. DUE TO
LAPSE RATE...CHC OF PCPN IS WEAK. COND DRY OUT RAPIDLY BY MON AFTN.
THE SFC LOW WILL SLIDE INTO THE OH VALLEY...AND A RDG WILL REMAIN
OVR CWA THRU WED. HOWEVER...WED NGT AND THU SEE ANOTHER WEAK SHRTWV
MOV THRU CWA. MEAN LYR RH WILL INCR TO 80 PCT.

.MQT...NONE.

DLG

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MARQUETTE MI
345 PM EDT THU MAY 30 2002

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0300 PM    TROUT CREEK               MI   .75 INCH HAIL
05/30/02   ONTONAGON

0305 PM    KENTON                    MI   .75 INCH HAIL
05/30/02   HOUGHTON

AJ/LAROSA

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MARQUETTE MI
450 PM EDT THU MAY 30 2002

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0430 PM    SOUTH REPUBLIC            MI   .88 INCH HAIL
05/30/02   MARQUETTE

AJ/GM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MARQUETTE MI
636 PM EDT THU MAY 30 2002

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0530 PM    WATSON                    MI   .75 INCH HAIL
05/30/02   MARQUETTE

0530 PM    ARNOLD                    MI   .75 INCH HAIL
05/30/02   MARQUETTE

0545 PM    INGALLS                   MI   .88 INCH HAIL
05/30/02   MENOMINEE

AJ/GM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MARQUETTE MI
641 PM EDT THU MAY 30 2002

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0530 PM    WATSON                    MI   .75 INCH HAIL
05/30/02   MARQUETTE

0550 PM    ARNOLD                    MI   .75 INCH HAIL
05/30/02   MARQUETTE

0545 PM    INGALLS                   MI   .88 INCH HAIL
05/30/02   MENOMINEE

AJ/GM

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MARQUETTE MI
832 PM EDT THU MAY 30 2002

TIME(EDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0825 PM    SAGOLA                    MI   1.75 INCH HAIL
05/30/02   DICKINSON

0825 PM    CHANNING                  MI   1.50 INCH HAIL
05/30/02   DICKINSON

0822 PM    CHANNING                  MI   .75 INCH HAIL
05/30/02   DICKINSON

AJ/GM