BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, OCTOBER 21, 2014    
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDS ARRIVE OVERNIGHT AS ONSHORE FLOW COMMENCES

Following a pleasant Monday afternoon with highs
reaching 56F on Great Blue Hill, clouds began to
filter in overnight ahead of an impending cut-off
low. Pressure has dropped slowly since yesterday
morning, with winds shifting to the more uncommon
direction of ESE-SE. 

A quick shower before sunrise produced 0.01 inches
of new precipitation this morning in both the standard
manual and ASOS automated precipitation gauges.


Today's Observations:

7 A.M.
Weather: Broken altocumulus, thin overcast of altostratus,
few stratocumulus in all directions, light smoke layer
below summit in all directions 
Temperature: 53F; Dew Point: 50F; Wind: ESE at 12 kts 
Sea-level pressure: 29.98 ins. Hg, falling, then rising, but lower            
Visibility: 30 miles, except 15 miles SW-NNE, light distant fog
SW-NNE, hazy in all directions
6-hr max temp: 53F 
6-hr min temp: 49F 
24-hr precip: 0.01 inch
BHO SA 1155 E55 BKN 150 -OVC 30 151/53/50/1112/998/ 
VSBY SW-NNE 15 MI LGT DSNT FG SW-NNE LGT K LYR BLO SMT ALQDS 
FEW SC ALQDS BINOVC SE-SSW HAZY/ 8/410 55001 
ASOS 60001 70001 MANUAL 70001 10053 20049

10 A.M.
Weather: Broken stratocumulus, broken altostratus,
thin overcast of cirrus, breaks in overcast distant W-WNW,
few cumulus fractus in all directions 
Temperature: 59F; Dew Point: 53F; Wind: SE at 8 kts,
Sea-level pressure: 29.97 ins. Hg, rising, then falling and lower
Visibility: 30 miles, hazy in all directions
BHO SA 1455 E45 BKN 110 BKN 250 -OVC 30 148/59/53/1408/997/ 
FEW CUFRA ALQDS BINOVC DSNT W-WNW HAZY/ 8/714 58003

1 P.M.
Weather: Showers in the vicinty SSE-SW, showers distant 
ESE-SSE and N, scattered cumulus, broken moderate and towering
cumulus in all directions, broken alto/nimbostratus
Temperature: 59F; Dew Point: 54F; Wind: SW at 7 kts,
Sea-level pressure: 29.93 ins. Hg, falling, then more quickly  
Visibility: 25 miles, except 8 miles SSE-SW, and 12 miles N, obscured
by rain showers  
6-hr precip: Trace
BHO SA 1755 18 SCT E35 BKN 90 BKN 25 134/59/54/1407/993/ 
VSBY SSE-SW 8 MI AND N 12 MI VCSH SSE-SW AND SHWRS DSNT ESE-SSE AND N 
TCU AND MDT CU SW-ESE/ 8/220 58014 MANUAL 6000/ 10061 20052

WEATHER SUMMARY FOR MONDAY, OCTOBER 20, 2014  

TEMPERATURE (DEGREES F)
MAX.....56   NORMAL.....59
MIN.....33   NORMAL.....41
MEAN....45   NORMAL.....50

DEPARTURE FROM 30-YEAR NORMAL.........................-5
TOTAL DEPARTURE FOR THE MONTH........................+58 [+2.7 DEGREES/DAY] 

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............20  DEPARTURE...........+5
TOTAL HEATING UNITS FOR THE MONTH.............180  DEPARTURE..........-56     
TOTAL HEATING UNITS FOR THE SEASON............281  DEPARTURE..........-97
TOTAL HEATING UNITS LAST SEASON TO DATE.......281  DIFFERENCE...........0

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY..................23 SW  AT   1:46 P.M.*       
                   ASOS.......................26 NW  AT  12:54 A.M.     
                   DAVIS......................25 WNW AT  12:26 A.M. RMY 25
FASTEST MILE FOR YESTERDAY....................18 WNW AT  12:56 A.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE.................18 SW  AT   1:46 P.M.                 
MAXIMUM 2-MINUTE DAVIS AVERAGE................17 SW  AT   1:47 P.M.                                    
AVERAGE WIND SPEED AND DIRECTION............11.6 SW  				
                   ASOS.....................12.5  
                   DAVIS....................10.2 WSW (245 degrees)  
* Last of several occurrences  
                
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01  DEPARTURE........-0.14
                         ASOS..............0.01
TOTAL PRECIPITATION FOR THE MONTH..........3.51  DEPARTURE........+0.53     
                         ASOS..............3.48  
TOTAL PRECIPITATION FOR THE YEAR..........35.10  DEPARTURE........-6.96
                         ASOS.............35.28   

 
PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY GUST
RMY:  R.M. Young wind gust recording system 
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized

10/1  56/55/56/-1/1.63/000/00              33 NE  RMY 36 
10/2  55/47/51/-6/0.29/000/00              30 NE  RMY N/A   
10/3  54/46/50/-6/0.05/000/00              20 NE  RMY 20
10/4  63/52/58/+2/0.30/000/00              30 SE  RMY 32
10/5  60/45/53/-3/0.00/658/95              26 W   RMY 28
10/6  66/42/54/-1/0.00/669/97              25 SSE RMY N/A
10/7  72/54/63/+8/0.01/281/38              43 S   RMY 49
10/8  72/53/63/+9/0.01/562/82              40 S   RMY N/A
10/9  64/48/56/+2/0.00/648/95              35 W   RMY 39 
10/10 63/43/53/-1/0.00/489/72              23 W   RMY N/A
10/11 50/43/47/-6/0.35/000/00              15 N   RMY N/A
10/12 60/40/50/-3/0.00/.../..              20 NW  RMY N/A
10/13 61/45/53/+0/0.00/.../..              23 S   RMY 25
10/14 75/58/67/+15/0.00/.../..             29 S   RMY 31
10/15 79/62/71/+18/0.02/.../..             32 SSW RMY 36
10/16 70/60/65/+14/0.60/000/00             37 S   RMY 41  
10/17 71/57/64/+13/0.00/.../..             28 SW  RMY 30
10/18 71/52/62/+11/0.24/.../..             28 WNW RMY 30 TSTM  
10/19 55/39/47/-3/0.00/.../..              28 NW  RMY 29
10/20 56/33/45/-5/0.00/.../..              23 SW  RMY 25

10/21 morning low temp: 49F since midnight; normal low now 41F

 
DAILY RECORDS FOR OCTOBER 2014:
10/1 - A NEW RECORD DAILY PRECIPITATION OF 1.63 INCHES;  
       surpasses the previous record of 1.44 ins. in 1984 
       
DAILY EXTREMES 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):     

RECORDS FOR OCTOBER 21
HIGH 79F IN 1979
LOW 24F IN 1974
PRECIP 2.39 INCHES IN 1944
SNOWFALL TRACE IN 1895,1907,1940
PEAK GUST 69e MPH S IN 1976

RECORDS FOR OCTOBER 22
HIGH 85F IN 1979
LOW 22F IN 1940
PRECIP 1.37 INCHES IN 1898
SNOWFALL TRACE IN 1969, 2010
PEAK GUST 67 MPH ESE IN 1988

TODAY'S REPORT PREPARED BY: Brian Fitzgerald