Thursday, August 27, 2020

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

THURSDAY, AUGUST 27, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER FALL-LIKE DAY WITH A PASSING
THUNDERSTORM AFTER NOONTIME….

We observed a good visibility of 75 miles this
morning, decreasing to a mile before 1 P.M.
Rainfall began around 12:45, ending 40 minutes
to an hour later. During that time, thunder could
be heard to the west, but not seen due to the fog.
Skies were mostly cloudy early, becoming completely
overcast by noon. Pressure has been on a steady fall,
of almost 4 millibars in a six hour period. Wind was
light and southwesterly, yet calm following the frontal
passage.

The high so far today is 68F, which is 10 degrees below
the daily normal maximum of 78F. The low since midnight
is 57F, 3 degrees below the average of 60F.

Today’s Observations:

7 A.M.
Weather: Broken altostratus
Temperature: 58F; Dew Point: 47F; Relative Humidity: 66%
Wind: W at 7 kts
Sea-level pressure: 29.84 ins. Hg: rising steadily
Visibility: 75 miles
6-hr Max temp: 59F
6-hr Min temp: 57F
24-hr Precip: 0.00 ins.
BHO SA 1155 E150 BKN 75 106/58/47/2607/984/ 8/070 50002
10059 20057

10 A.M.
Weather: Overcast altostratus
Temperature: 62F; Dew Point: 50F; Relative Humidity: 65%
Wind: SSW at 7 kts
Sea-level pressure: 29.79 ins. Hg: rising then falling
Visibility: 75 miles
3-hr Precip: Trace
BHO SA 1455 E150 OVC 75 090/62/50/2207/979/ 8/070 600//
55016

1 P.M.
Weather: Moderate rain and fog, Broken stratus fractus,
overcast nimbostratus
Temperature: 60F; Dew Point: 60F; Relative Humidity: 100%
Wind: WNW at 5 kts, light
Sea-level pressure: 29.71 ins. Hg: falling rapidly
Visibility: 1 mile, fog
6-hr Max temp: 68F
6-hr Min temp: 58F
6-hr Precip: 0.08 ins.
BHO SA 1755 E20 BKN 65 OVC 1RF 061/60/60/0905/971/ RB45 WND
LGT/ 8/72/ 6008/ 56029 10068 20058

SUMMARY FOR WEDNESDAY, AUGUST 26, 2020

TEMPERATURE (DEGREES F)
MAX…..74   NORMAL…..78
MIN…..56   NORMAL…..61
MEAN….65   NORMAL…..69

DEPARTURE FROM 30-YEAR NORMAL…………….. -4
TOTAL DEPARTURE FOR THE MONTH…………….+104 [+3.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY………………0  DEPARTURE……-5
TOTAL COOLING UNITS FOR THE MONTH…………….259  DEPARTURE……+95
TOTAL COOLING UNITS FOR THE SEASON……………746  DEPARTURE…..+226
TOTAL COOLING UNITS LAST SEASON TO DATE……….598  DEPARTURE…..+148

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..29 NW  AT 12:35 A.M.
AERO…………………….32 NW  AT 12:34 A.M.
ASOS…………………….30 NW  AT 12:36 A.M.
DAVIS……………………30 NW  AT 12:36 A.M.
RMY N/A  MERLIN N/A
FASTEST MILE FOR YESTERDAY………………….23 W   AT  3:10 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 W   AT  3:11 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 NW  AT 12:36 A.M.
AVERAGE WIND SPEED AND DIRECTION………….. 13.1 WNW
ASOS………………….. 13.1
DAVIS…………………. 13.4 NW

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.35  DEPARTURE……-0.13
ASOS…………..3.37
TOTAL PRECIPITATION FOR THE YEAR……….32.42  DEPARTURE……-2.05
ASOS………….33.18

PRELIMINARY CLIMATE SUMMARY FOR AUGUST CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system 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
M:    Missing data

08/01  87/66/77/+5/0.00/…/..             18 S    AERO 21 S    RMY 19
08/02  85/69/77/+5/0.02/…/..             36 S    AERO 37 S    RMY 38
08/03  91/75/83/+11/0.00/715/83            36 WSW  AERO 38 SW   RMY 36
08/04  83/71/77/5/0.21/094/11              67 SSE  AERO 71 S    RMY 70
08/05  90/68/79/+7/0.00/668/78             28 SW   AERO 30 SW   RMY 29
08/06  84/65/75/3/0.00/701/82   20 W    AERO 17 W    RMY 19
08/07  79/65/72/0/T/136/16                 16 NE   AERO 16 NE   RMY N/A
08/08  83/64/74/+2/0.00/612/72             20 S    AERO 20 S    RMY 19
08/09  90/65/78/+6/0.00/661/78             26 SSW  AERO 26 SSW  RMY 26
08/10  94/69/82/+11/0.00/727/86            22 W    AERO 20 W    RMY 20
08/11  92/72/82/+11/0.00/…/..            31 SSW  AERO 35 SSW  RMY 31  TSTM
08/12  93/74/84/+13/0.00/…/..            22 SSW  AERO 22 SW   RMY 19
08/13  88/71/80/+9/0.00/…/..             18 ENE  AERO 18 NE   RMY 18
08/14  82/67/75/+4/0.00/…/..             23 ENE  AERO 23 ENE RMY N/A
08/15  67/62/65/-6/T/…/..                33 NNE  AERO 32 NNE  RMY N/A
08/16  69/62/66/-5/…./…/..             26 ENE  AERO 28 ENE  RMY 26
08/17  73/59/66/-5/…./…/..             25 NE   AERO 24 NE   RMY N/A
08/18  84/63/74/+3/…./…/..             23 W    AERO 23 W    RMY 24
08/19  81/59/70/0/0.03/…/..              26 W    AERO 28 W    RMY 27
08/20  80/56/68/-2/0.00/…/..             22 W    AERO 21 W    RMY 22
08/21  88/61/75/+5/0.00/…/..             28 SW   AERO 26 SW   RMY 28
08/22  85/66/76/+6/0.26/…/..             18 NNE  AERO 16 S    RMY 16
08/23  89/63/76/+6/2.21/…/..             60 WNW  AERO 53 WNW  RMY 58  TSTM HAIL
08/24  87/67/77/+7/0.00/…/..             18 S    AERO 18 S    RMY 19
08/25  86/65/76/+7/0.01/…/..             35 NNW  AERO 37 NNW  RMY 35
08/26  74/56/65/-4/0.00/…/..             29 NW   AERO 32 NW   RMY N/A

08/27  The low since midnight is 57F, the daily normal low is 61F

DAILY RECORDS FOR AUGUST 2020

8/23/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 89F,
BREAKS PREVIOUS RECORD of 88F SET IN 1918, 1947, 1949, 1996

8/23/20: DAILY RECORD PRECIPITATION OF 2.21 INS,
BREAKS PREVIOUS RECORD OF 2.09 INS SET IN 2010

8/23/20: DAILY RECORD PEAK WIND GUST OF 60 MPH,
TIES PREVIOUS RECORD OF 60 MPH SET IN 1940

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR AUGUST 27
HIGH 99F IN 1948
LOW 44F IN 1885
PRECIP 2.77 INCHES IN 1946
PEAK GUST 48 MPH NW IN 1983

RECORDS FOR AUGUST 28
HIGH 95F IN 1948
LOW 43F IN 1885
PRECIP 1.80 INCHES IN 1922
PEAK GUST 87 MPH SSE IN 1971 (DORIA)

TODAY’S REPORT PREPARED BY: Benjamin Turner