❰ Current Conditions

Fire Weather Discussion
Fire Weather Planning Forecast for Southern New England
National Weather Service Boston/Norton MA
441 PM EDT Wed Sep 22 2021

.DISCUSSION...   

High pressure south of the Maritimes will move father offshore 
tonight leading to an increased risk for showers across the western 
half of southern New England. The risk of showers will slowly spread 
east across eastern sections later Thursday and Thursday night. 

Minimum relative humidity values will be 70 to 85 percent on 
Thursday. Southeast winds will be less than 20 mph both days.

OUTLOOK...Friday through Tuesday...

A slow-moving cold front crosses the region Friday and moves east 
out to sea on Saturday. This will bring showers and embedded 
thunderstorms along with heavy downpours. A few leftover showers are 
possible Sunday. Unsettled weather sticks around early next week 
with seasonable temperatures late this weekend into Tuesday.

232045-
Southeast Middlesex MA-
Including the cities of Cambridge, Lexington, Newton, Waltham, 
and Woburn
441 PM EDT Wed Sep 22 2021

                      Tonight      Thu          Thu Night    Fri          

Cloud Cover           Mcldy        Mcldy        Mcldy        Mcldy        
Precip Type           Showers      Showers      Showers      Tstms        
Chance Precip (%)     50           20           30           70           
Temp (24h trend)      64 (-1)      78 (0)       66           76           
RH % (24h trend)      97 (-3)      67 (+1)      97           79           
20ft Wnd AM(mph)                   SE  6                     SE  8        
20ft Wnd PM(mph)      S  5         SE  8        SE  7        S  8         
Precip Amount         0.01         0.01         0.01         0.39         
Precip Duration       1            1            2            7            
Precip Begin          6 PM         8 AM         Continuing   Continuing   
Precip End            9 PM         Continuing   Continuing   Continuing   
Mixing Hgt (ft-AGL)   150          5220         170          2230         
Transport Wnd (kts)   SE 12        S 17         SE 11        S 16         
Vent Rate (kt-ft)     1800         88740        1870         35680        
ADI early             31 Fair      40 Fair      30 Fair      37 Fair      
ADI late              10 Poor      59 Gen Good  11 Poor      35 Fair      
Max LVORI early       5            5            5            5            
Max LVORI late        6            3            6            4            
CWR                   10           0            10           100          
LAL                   No Tstms     No Tstms     No Tstms     9-15 Strikes 
Haines Index          4            2            3            3            

REMARKS...None.

.FORECAST FOR DAYS 3 THROUGH 7...
.FRIDAY NIGHT...Mostly cloudy with showers likely and a chance of
thunderstorms. Patchy fog. Lows in the lower 60s. South winds
5 to 10 mph. 
.SATURDAY...Mostly sunny. Patchy fog. Highs in the mid 70s.
Southwest winds around 5 mph. 
.SATURDAY NIGHT...Partly cloudy. Patchy fog. Lows in the upper
50s. Southwest winds around 5 mph. 
.SUNDAY...Mostly sunny. Patchy fog. Highs in the mid 70s. West
winds around 5 mph. 
.SUNDAY NIGHT AND MONDAY...Mostly clear. Lows in the mid 50s.
Highs in the lower 70s. Southwest winds 5 to 10 mph. 
.MONDAY NIGHT...Partly cloudy. Lows in the mid 50s. Southwest
winds around 5 mph. 
.TUESDAY AND TUESDAY NIGHT...Mostly cloudy. A chance of showers.
Lows in the mid 50s. Highs in the mid 70s. Northwest winds around
5 mph. 
.WEDNESDAY...Mostly sunny. Highs in the upper 60s. North winds
around 5 mph.