464  
FNUS71 KBOX 151100  
FWSBOX  
 
SPOT FORECAST FOR WESTOVER AIR SHOW...MASSACHUSETTS EMERGENCY MANAGEMENT AGENCY  
NATIONAL WEATHER SERVICE BOSTON/NORTON MA  
700 AM EDT SUN JUL 15 2018  
 
FORECAST IS BASED ON FORECAST START TIME OF 0800 EDT ON JULY 15.  
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER  
SERVICE.  
   
DISCUSSION
 
 
A FEW SCATTERED SHOWERS WILL MOVE INTO THE AIRFIELD EARLY THIS  
MORNING. APPEARS THAT THERE IS A PERIOD OF DRY WEATHER TODAY.  
THERE IS A RISK FOR AN ISOLATED THUNDERSTORM AROUND MID-DAY.  
OTHERWISE WARM AND HUMID CONDITIONS TODAY.  
   
TODAY
 
 
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT) THEN BECOMING  
MOSTLY SUNNY (40-50 PERCENT). SLIGHT CHANCE OF  
THUNDERSTORMS THROUGH THE DAY. SCATTERED  
SHOWERS IN THE MORNING, THEN SLIGHT CHANCE OF  
SHOWERS EARLY.  
CHANCE OF PCPN......30 PERCENT.  
CHANCE OF RAIN......MISSING.  
CHANCE OF THUNDER...MISSING.  
BEGIN/END OF PCPN...  
MAX TEMPERATURE.....AROUND 88.  
MIN HUMIDITY........55 PERCENT.  
MAX APPARENT TEMP...91.  
MAX APPARENT TEMP...91.  
EYE LEVEL WINDS.....LIGHT WINDS BECOMING NORTHWEST AROUND 3 MPH  
EARLY IN THE AFTERNOON, THEN SHIFTING TO THE  
SOUTHWEST LATE IN THE AFTERNOON.  
SURFACE WINDS.......LIGHT WINDS BECOMING NORTHWEST AROUND 5 MPH  
EARLY IN THE AFTERNOON, THEN SHIFTING TO THE  
SOUTHWEST LATE IN THE AFTERNOON.  
WIND (20 FT)........LIGHT WINDS BECOMING NORTHWEST AROUND 5 MPH  
EARLY IN THE AFTERNOON, THEN SHIFTING TO THE  
SOUTHWEST LATE IN THE AFTERNOON. GUSTY AND  
ERRATIC WINDS EXPECTED NEAR THUNDERSTORMS.  
RAINFALL AMOUNT.....0.19 INCHES.  
PCPN AMOUNT.........0.19 INCHES.  
SNOWFALL AMOUNT.....0.0 INCHES.  
 
TIME (EDT) 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM  
SKY (%).........91 79 68 56 56 56 56 52 48 44  
WEATHER COV.....SCT SCT SCT ISO SCH SCH SCH SCH SCH SCH  
WEATHER TYPE....RW RW RW RW RW RW RW RW RW RW  
TSTM COV........ISO ISO ISO ISO SCH SCH SCH SCH SCH SCH  
CHC OF PCPN (%).30 30 30 20 20 20 20 20 20 20  
CHC OF RAIN (%).40 40 40 20 20 20 20 20 20 20  
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0  
TEMP............72 74 77 79 82 85 87 87 87 86  
RH..............90 84 79 74 67 59 55 55 55 57  
HEAT INDEX (F)..72 74 77 79 86 89 91 91 91 90  
WIND CHILL (F)..72 74 77 79 86 89 91 91 91 90  
20 FT WIND DIR..SE S W NW NW NW NW W SW SW  
20 FT WIND SPD..1 2 2 3 3 3 5 5 5 5  
20 FT WIND GUST.6 6 7 7 8 8 7 7 6 6  
EYE LVL WND DIR.SE S W NW NW NW NW W SW SW  
EYE LVL WND SPD.1 1 1 2 2 2 3 3 3 3  
EYE LVL WND GST.4 4 4 4 5 5 4 4 4 4  
SURFACE WND DIR.SE S W NW NW NW NW W SW SW  
SURFACE WND SPD.1 2 2 3 3 3 5 5 5 5  
SURFACE WND GST.6 6 7 7 8 8 7 7 6 6  
   
TONIGHT
 
 
SKY/WEATHER.........PARTLY CLOUDY (25-35 PERCENT). SLIGHT CHANCE OF  
SHOWERS AND THUNDERSTORMS EARLY IN THE EVENING.  
CHANCE OF PCPN......20 PERCENT.  
CHANCE OF RAIN......MISSING.  
CHANCE OF THUNDER...MISSING.  
BEGIN/END OF PCPN...  
MIN TEMPERATURE.....AROUND 66.  
MAX HUMIDITY........100 PERCENT.  
MAX APPARENT TEMP...88.  
MAX APPARENT TEMP...88.  
EYE LEVEL WINDS.....SOUTHWEST WINDS AROUND 3 MPH EARLY IN THE  
EVENING BECOMING LIGHT.  
SURFACE WINDS.......SOUTHWEST WINDS AROUND 5 MPH EARLY IN THE  
EVENING BECOMING LIGHT.  
WIND (20 FT)........SOUTHWEST WINDS AROUND 5 MPH EARLY IN THE  
EVENING BECOMING LIGHT. GUSTY AND ERRATIC WINDS  
EXPECTED NEAR THUNDERSTORMS EARLY IN THE  
EVENING.  
RAINFALL AMOUNT.....0.03 INCHES.  
PCPN AMOUNT.........0.03 INCHES.  
SNOWFALL AMOUNT.....0.0 INCHES.  
 
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM  
SKY (%).........40 36 32 27 22 17 17 17 27 33 38 44  
WEATHER COV.....SCH SCH SCH  
WEATHER TYPE....RW RW RW  
TSTM COV........SCH SCH SCH  
CHC OF PCPN (%).20 20 20 10 10 10 10 10 10 10 0 0  
CHC OF RAIN (%).20 20 20 0 0 0 0 0 0 0 0 0  
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0  
TEMP............84 82 80 77 75 73 71 70 69 68 67 67  
RH..............63 67 74 82 84 90 93 97 97 97 100 97  
HEAT INDEX (F)..88 86 83 77 75 73 71 70 69 68 67 67  
WIND CHILL (F)..88 86 83 77 75 73 71 70 69 68 67 67  
20 FT WIND DIR..SW S S S SE SE E E E E E E  
20 FT WIND SPD..5 5 3 2 2 2 2 2 2 1 1 1  
20 FT WIND GUST.6 6 5 5 3 3 3 3 3 2 2 2  
EYE LVL WND DIR.SW S S S SE SE E E E E E E  
EYE LVL WND SPD.3 3 2 1 1 1 1 1 1 1 1 1  
EYE LVL WND GST.4 4 3 3 2 2 2 2 2  
SURFACE WND DIR.SW S S S SE SE E E E E E E  
SURFACE WND SPD.5 5 3 2 2 2 2 2 2 1 1 1  
SURFACE WND GST.6 6 5 5 3 3 3 3 3 2 2 2  
 

 
FORECASTER...DUNTEN  
REQUESTED BY...HEATHER SMITH  
TYPE OF REQUEST...OTHER  
.TAG 1812791.1/BOX  
.DELDT 07/15/18  
.EMAIL MEMA.STATECONTROL@MASS.GOV  
 
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