022  
FNUS71 KBOX 181527  
FWSBOX  
 
SPOT FORECAST FOR PLANNED EVENT...MEMA  
NATIONAL WEATHER SERVICE BOSTON/NORTON MA  
1127 AM EDT TUE SEP 18 2018  
 
FORECAST IS BASED ON FORECAST START TIME OF 1200 EDT ON SEPTEMBER 18.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
STRONGER THUNDERSTORMS HAVE MOVED SOUTHEAST OF LAWRENCE. HOWEVER,  
FAIRLY STEADY SHOWERS WILL CONTINUE INTO THIS AFTERNOON. MODERATE  
TO HEAVY RAINFALL RATES ARE POSSIBLE, WHICH MAY LEAD TO URBAN AND  
POOR DRAINAGE FLOODING. STILL A LOW RISK FOR AN ISOLATED  
THUNDERSTORM THROUGH EARLY AFTERNOON. RAIN WILL GRADUALLY  
DIMINISH LATER THIS EVENING.  
 
OUTLOOK...THURSDAY THROUGH SATURDAY...  
 
A RIDGE OF HIGH PRESSURE WILL BRING A RETURN OF DRY CONDITIONS  
FOR THE OUTLOOK PERIOD.  
   
REST OF TODAY
 
 
TIME (EDT) 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........100 100 99 89 81 75  
WEATHER COV.....DEF DEF DEF DEF LKY LKY  
WEATHER TYPE....RW RW RW RW RW RW  
TSTM COV........ISO ISO ISO ISO SCH ISO  
CHC OF PCPN (%).100 90 90 80 70 60  
CHC OF RAIN (%).80 80 80 80 60 60  
CHC OF THDR (%).0 0 0 0 0 0  
TEMP............74 74 74 74 75 74  
RH..............90 90 90 87 84 84  
HEAT INDEX (F)..74 74 74 74 75 74  
WIND CHILL (F)..74 74 74 74 75 74  
20 FT WIND DIR..SW W NW NW NW NW  
20 FT WIND SPD..6 6 6 6 5 3  
20 FT WIND GUST.16 15 14 13 12 9  
EYE LVL WND DIR.SW W NW NW NW NW  
EYE LVL WND SPD.4 4 4 4 3 2  
EYE LVL WND GST.10 9 8 8 7 5  
SURFACE WND DIR.SW W NW NW NW NW  
SURFACE WND SPD.6 6 6 6 5 3  
SURFACE WND GST.16 15 14 13 12 9  
 

 
FORECASTER...BELK  
REQUESTED BY...LAUREN SARDELLA  
TYPE OF REQUEST...OTHER  
.TAG 1815935.0/BOX  
.DELDT 09/18/18  
.EMAIL LAUREN.SARDELLA@MASS.GOV  
 
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