841  
FXUS63 KGRR 291921  
AFDGRR  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE GRAND RAPIDS MI  
321 PM EDT MON JUN 29 2015  
 
LATEST UPDATE...  
SYNOPSIS/SHORT TERM/LONG TERM/MARINE  
   
SYNOPSIS
 
 
ISSUED AT 321 PM EDT MON JUN 29 2015  
 
SCATTERED MAINLY DIURNAL SHOWERS AND THUNDERSTORMS ARE POSSIBLE INTO  
WEDNESDAY. NO SEVERE WEATHER IS EXPECTED. THE NEXT SYSTEM IS THEN  
NOT EXPECTED UNTIL SUNDAY... AFTER AN AREA OF HIGH PRESSURE CROSSES  
THE REGION. TEMPERATURES SHOULD BE A LITTLE BELOW NORMAL THROUGH THE  
WEEK AND WARM TO AROUND NORMAL ON THE WEEKEND.  
 

 
   
SHORT TERM
 
(THIS EVENING THROUGH WEDNESDAY NIGHT)  
ISSUED AT 321 PM EDT MON JUN 29 2015  
 
WITH A RIDGE OVER THE WEST OF THE CONUS AND A TROUGH OVER THE EAST  
THROUGH WEDNESDAY NIGHT... WEAK WAVES WILL BE FLOWING MOSTLY TO THE  
SOUTH OF THE REGION WITH MAINLY DIURNAL SHOWERS AND STORMS FIRING UP  
OVER THE FORECAST AREA. THE BEST ACTIVITY SHOULD BE ON TUESDAY AS A  
WAVE COMES THROUGH DURING THE DAY AND SHOULD ENHANCE THE  
INSTABILITY. EVEN THEN... SEVERE WEATHER IS NOT ANTICIPATED.  
LIGHTNING... SMALL HAIL AND LOCALLY HEAVY RAIN ARE POSSIBLE.  
 
TEMPERATURES DURING THE SHORT TERM WILL BE A COUPLE DEGREES BELOW  
NORMAL.  
   
LONG TERM
 
(THURSDAY THROUGH MONDAY)  
ISSUED AT 321 PM EDT MON JUN 29 2015  
 
PLEASANT SUMMER WEATHER WILL CONTINUE THROUGH MUCH OF THE WEEKEND.  
HIGH TEMPERATURES WILL BE IN THE 75 TO 80 DEGREE RANGE AND DEWPOINTS  
WILL BE IN THE 50S. THAT MEANS HUMIDITY WILL BE KEPT ON THE LOW SIDE  
RELATIVE TO SUMMER NORMS.  
 
THE WEATHER PATTERN FROM THURSDAY THROUGH SATURDAY WILL SEE AN UPPER  
TROUGH AND A SFC HIGH OVER THE GREAT LAKES. THAT COMBINATION USUALLY  
RESULTS IN MOSTLY SUNNY SKIES AND AFTERNOON CU AND MOSTLY CLEAR  
NIGHTS. THE EASTERLY COMPONENT TO THE WIND WILL ALSO PRODUCE SOME  
UPWELLING OVER THE NEAR SHORE...SO WATER TEMPERATURES WILL LIKELY  
REMAIN CHILLY OVER THE HOLIDAY WEEKEND. HOWEVER...WAVES WILL BE LOW  
DUE TO WEAK WINDS UNDER THE HIGH.  
 
THE BEST CHANCE OF SHOWERS AND THUNDERSTORMS LOOKS TO BE LATE SUNDAY  
AND MONDAY AS MOISTURE MOVES NORTH ON THE BACK SIDE OF THE HIGH  
AHEAD OF THE NEXT COLD FRONT.  
 

 
   
AVIATION
 
(FOR THE 18Z TAFS THROUGH 18Z TUESDAY AFTERNOON)  
ISSUED AT 138 PM EDT MON JUN 29 2015  
 
AS EXPECTED...SCT SHOWERS/STORMS HAVE DEVELOPED EARLY THIS  
AFTERNOON AND THEY WILL CONTINUE UNTIL EARLY EVENING. MOSTLY VFR  
EXPECTED. HOWEVER MVFR CIGS MAY DEVELOP OVER THE SOUTHERN TAF  
SITES THIS AFTERNOON.  
 
MVFR/IFR FOG/CIGS MAY DEVELOP OVERNIGHT AS SKIES CLEAR. ABUNDANT  
LOW LEVEL MOISTURE REMAINS FROM RECENT RAINS.  
 

 
   
MARINE
 
 
ISSUED AT 321 PM EDT MON JUN 29 2015  
 
LATE TUESDAY INTO TUESDAY NIGHT WE COULD SEE 2 TO 3 FOOT WAVES ON  
LAKE MICHIGAN... AS NORTH FLOW PICKS UP TO 10 TO 15 KNOTS. OTHERWISE  
EXPECTING WAVES BELOW 2 FEET WITH LIMITED CONCERNS.  
 

 
   
HYDROLOGY
 
 
ISSUED AT 220 PM EDT MON JUN 29 2015  
 
SEVERAL RIVER FLOOD ADVISORIES REMAIN AT SOME POINTS IN THE GRAND  
AND KALAMAZOO RIVER BASINS. RIVER LEVELS AT MOST LOCATIONS ARE  
FALLING. SHOWERS AND THUNDERSTORMS TODAY AND TUESDAY MAY PRODUCE  
LOCALLY HEAVY RAINFALL... BUT BASIN AVERAGE RAINFALL AMOUNTS WILL  
BE RATHER LOW AND SHOULD NOT IMPACT THE LARGER RIVERS. NO  
WIDESPREAD HEAVY RAIN EVENTS ARE EXPECTED THIS WEEK.  
 

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

 
 

 
 
SYNOPSIS...63  
SHORT TERM...63  
LONG TERM...04  
AVIATION...04  
HYDROLOGY...CAS  
MARINE...63  
 
CLICK HERE TO GO TO PREVIOUS BULLETINS.

The Nexlab MI Page
The Nexlab IN Page Main Text Page