BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, JULY 20, 2012 
ALL TIMES ARE IN EASTERN STANDARD TIME
 
OVERCAST SKIES LEAD TO MUCH COOLER DAY
FIRST COOLER THAN NORMAL DAY SINCE JUNE 27!
 
Today has been a much cooler day than we have been used to. The maximum
temperature so far today is only 69F. The maximum temperature has not been
this low since June 18th, where the maximum was only 68F. Today will
also mark the first day since June 27th where the average daily temperature
will finish below normal!
 
Overcast skies have remained over the summit for most of the day as a
stationary front sits to our south but is moving offshore. There has been
a nice display of mid level clouds today and some very subtle mammatus
clouds were seen off to our SE, a very uncommon occurrence here at Blue
Hill, and for most of the northeast for that matter. Winds have been
relatively weak out of the east with a scent of ocean every now and then.
 
Off to our north we have a Canadian high moving down which will be our
weather-maker for the weekend. This weekend will be very pleasant with
temperatures in the upper 70's and lower 80's with lower humidity values
and mostly sunny skies.
 
 
Today's observations:
 
7 A.M.
Weather: Scattered altocumulus, broken altocumulus, few altocumulus
castellanus S-W, few altocumulus standing lenticularis SW-NE, sun dimly
visible, thin smoke layer N
Temperature: 66F; Dew Point: 59F 
Wind: ENE at 10 kts   
Sea-level pressure: 30.08 ins. Hg, increasing then steady    
Visibility: 55 miles, 70-75 miles WSW-NW, 30-35 miles E-SW
6-hour min. temp: 64F
BHO SA 1155 80 SCT E180 BKN 55 185/66/59/0710/008/ FEW ACC S-W FEW ACSL
SW-NE SUN DMLY VSBL THN K LYR N VSBY HIER WSW-NW 70V75 VSBY LWR E-SW 30V35/
8/040 51007 10066 20064
 
10 A.M.
Weather: Overcast altostratus, few cumulus/cumulus fractus all quadrants,
cumulus band SE-SSW, cumulus mammatus SE, few altocumulus standing
lenticularis all quadrants except NNW-NE
Temperature: 68F; Dew Point: 57F 
Wind: E at 10 kts 
Sea-level pressure: 30.10 ins. Hg, increasing slightly
Visibility: 60 miles, 45 miles SE-SW
BHO SA 1455 E180 OVC 60 192/68/57/0910/010/ FEW CU/CUFRA ALQDS CU BAND
SE-SSW CU MAMMA SE FEW ACSL ALQDS XCPT NNW-NE VSBY LWR SE-SW 45/ 8/17/
50007
 
1 P.M.
Weather: Overcast altostratus, few cumulus/cumulus fractus all quadrants
except NE-SE, few altocumulus S, few altocumulus standing lenticularis N
and ESE-W, few altocumulus castellanus SE-SW
Temperature: 68F; Dew Point: 56F
Wind: E at 9 kts
Sea-level pressure: 30.09 ins. Hg, decreasing then increasing 
Visibility: 55 miles, 60-65 miles W-ENE, 45 miles SSE-SW
6-hour max temp: 69F
BHO SA 1455 E180 OVC 55 190/68/56/1007/009/ FEW CU/CUFRA ALQDS XCPT NE-SE
FEW AC S FEW ACSL N AND ESE-W FEW ACC SE-SW VSBY HIER W-ENE 60V65 VSBY LWR
SSE-SW 45/ 8/17/ 55002 10069 20066
 
 
WEATHER SUMMARY FOR THURSDAY, JULY 19
 
TEMPERATURE (DEGREES F)
MAX.....81    NORMAL.....81
MIN.....64    NORMAL.....63
MEAN....72    NORMAL.....72
 
DEPARTURE FROM 30-YEAR NORMAL........................0
TOTAL DEPARTURE FOR THE MONTH......................+95 [+4.8 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............21 NNW AT 12:02 A.M.
                   AERO..................18 NNW AT 12:05 A.M.
                   ASOS..................22 NNE AT 12:03 A.M.
                   DAVIS.................21 N   AT UNKNOWN TIME RMY 18
THE FASTEST MILE FOR YESTERDAY...........13 E   AT  8:38 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE............14 N   AT 12:03 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........13 N   AT UNKNOWN TIME
AVERAGE WIND SPEED AND DIRECTION........6.8 NE
                   ASOS.................6.4
                   DAVIS................6.5 NE [046 deg]
* Last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.00   DEPARTURE...........-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.83   DEPARTURE...........-0.50
                         ASOS..............1.84
TOTAL PRECIPITATION FOR THE YEAR..........19.52   DEPARTURE...........-9.78
                         ASOS.............19.46
 
PRELIMINARY CLIMATE SUMMARY FOR JULY 2012 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
7/1  89/67/78/+8/0.01/676/74        33 WSW AERO 32 MPH WSW RMY 34 TSTM
7/2  84/66/75/+5/T/644/71           23 W   AERO 22 MPH W   RMY 23
7/3  85/63/74/+3/0.00/787/86        23 W   AERO 21 MPH W   RMY 20
7/4  85/66/76/+5/0.37/480/53        20 W   AERO 20 MPH W   RMY 23 TSTM
7/5  81/68/75/+4/0.00/729/80        23 NW  AERO 23 MPH NW  RMY 22
7/6  86/64/75/+4/0.00/753/83        18 SSW AERO 18 MPH SSW RMY 19
7/7  81/69/75/+4/T/224/25           23 W   AERO 23 MPH W   RMY 24
7/8  87/66/77/+5/0.00/814/90        23 W   AERO 23 MPH W   RMY 25
7/9  82/61/72/0/0.00/738/85         22 W   AERO 21 MPH W   RMY 23
7/10 83/61/72/0/0.00/852/98         18 W   AERO 18 MPH W   RMY 18
7/11 84/64/74/+2/0.00/768/88        21 W   AERO 21 MPH W   RMY 23
7/12 89/64/77/+5/0.00/875/97        25 SSW AERO 25 MPH SSW RMY 26
7/13 89/66/78/+6/0.00/604/67        28 S   AERO 27 MPH S   RMY 29
7/14 90/69/80/+8/0.00/521/58        24 W   AERO 22 MPH W   RMY 23
7/15 91/68/80/+8/T/539/60           18 SW  AERO 18 MPH SSW RMY 20
7/16 91/70/81/+9/T/771/86           23 NW  AERO 23 MPH NW  RMY 24
7/17 95/71/83/+11/0.00/831/93       33 SSW AERO 33 MPH SSW RMY 35
7/18 91/69/80/+8/1.45/.../..        40 NE  AERO 39 MPH NE  RMY 41 TSTM
7/19 81/63/72/0/0.00/.../..         21 NNW AERO 18 MPH NNW RMY 18
 
7/20 morning low temp: 64F; the normal low is now 63F
 
DAILY RECORDS FOR JULY 2012
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 20
HIGH 99F IN 1991
LOW 47F IN 1890
PRECIP 1.64 INS IN 1938
WIND 56e MPH SSW IN 1943
 
RECORDS FOR JULY 21
HIGH 100F IN 1977 [RECORD FOR MONTH]
LOW 48F IN 1890
PRECIP 2.09 INCHES IN 1938
PEAK GUST 60e MPH WNW IN 1977
 
TODAY'S REPORT PREPARED BY: George Tabeek