Monday, August 17, 2020

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

MONDAY, AUGUST 17, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

FOGGY THIS MORNING FOLLOWING SOME MUCH-NEEDED
OVERNIGHT RAINFALL….

We observed not much this morning, as we could
only see a half mile due to fog.  However, it
cleared up shortly after the 7 A.M. observation,
and some sunshine broke through the clouds around
noontime.  Luckily we received some rainfall
overnight, amounting to 0.38 inches. Visibility
rose to 40 miles by 10 A.M., and has stayed that
way since then. Wind is cool and easterly, but
less than 10 mph. The max gust so far today is
15 mph.

The high so far today is 71F, 9 degrees below the
daily normal maximum of 80F. The low since midnight
is 59F, 3 degrees below the normal minimum of 62F.

Today’s Observations:

7 A.M.
Weather: Fog
Temperature: 61F; Dew Point: 61F; Relative Humidity: 100%
Wind: NNW at 8 kts
Sea-level pressure: 29.92 ins. Hg: rising then steady
Visibility: 1/2 mile, fog
6-hr Max temp: 62F
6-hr Min temp: 59F
24-hr Precip: 0.38 ins.
BHO SA 1155 X W3 1/2F 132/61/61/3408/992/ 8//// 70038
51010 10062 20059

10 A.M.
Weather: Broken stratocumulus
Temperature: 65F; Dew Point: 60F; Relative Humidity: 83%
Wind: NNE at 7 kts
Sea-level pressure: 29.93 ins. Hg: falling then rising
Visibility: 40 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E20 BKN 40 136/65/60/0207/993/ 8/500 50004

1 P.M.
Weather: Broken stratocumulus and altostratus
Temperature: 71F; Dew Point: 57F; Relative Humidity: 61%
Wind: E at 7 kts
Sea-level pressure: 29.93 ins. Hg: falling, then steady
Visibility: 40 miles
6-hr Max temp: 71F
6-hr Min temp: 61F
6-hr Precip: 0.00 ins.
BHO SA 1755 E40 BKN 90 BKN 40 135/71/57/0807/993/ 8/820
55001 10071 20061

SUMMARY FOR SUNDAY, AUGUST 16, 2020

TEMPERATURE (DEGREES F)
MAX…..69   NORMAL…..79
MIN…..62   NORMAL…..62
MEAN….66   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL……………..-5
TOTAL DEPARTURE FOR THE MONTH……………..+79 [+4.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………..1   DEPARTURE…….-5
TOTAL COOLING UNITS FOR THE MONTH…………….186  DEPARTURE……+77
TOTAL COOLING UNITS FOR THE SEASON……………673  DEPARTURE…..+213
TOTAL COOLING UNITS LAST SEASON TO DATE……….518  DEPARTURE…..+155

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..26 ENE AT  9:37 A.M.
AERO…………………….28 ENE AT  9:38 A.M.
ASOS…………………….27 ENE AT  9:37 A.M.
DAVIS……………………28 E   AT  9:30 A.M
RMY 26  MERLIN 26
FASTEST MILE FOR YESTERDAY………………….19 ENE AT  9:44 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 ENE AT  9:54 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………20 E   AT  9:44 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….11.6 NE
ASOS…………………….12.0
DAVIS……………………12.0 ENE [69 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.38  DEPARTURE……+0.25
ASOS…………..0.38
TOTAL PRECIPITATION FOR THE MONTH……….0.61  DEPARTURE……-1.62
ASOS…………..0.62
TOTAL PRECIPITATION FOR THE YEAR……….29.68  DEPARTURE……-3.54
ASOS………….30.43

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/…/..            36 WSW  AERO 38 SW   RMY 36
08/04  83/71/77/5/0.21/…/..              67 SSE  AERO 71 S    RMY 70
08/05  90/68/79/+7/0.00/…/..             28 SW   AERO 30 SW   RMY 29
08/06  84/65/75/3/0.00/…/.. 20 W    AERO 17 W    RMY 19
08/07  79/65/72/0/T/…/..                 16 NE   AERO 16 NE   RMY N/A
08/08  83/64/74/+2/0.00/…/..             20 S    AERO 20 S    RMY 19
08/09  90/65/78/+6/0.00/…/..             26 SSW  AERO 26 SSW  RMY 26
08/10  94/69/82/+11/0.00/…/..            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  The low since midnight is 59F, the daily normal low is 62F

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

RECORDS FOR AUGUST 17
HIGH 97F IN 1944
LOW 48F IN 1902
PRECIP 2.17 INCHES IN 1998
PEAK GUST 50e MPH SSW IN 1952, 50 MPH WNW IN 1962

RECORDS FOR AUGUST 18
HIGH 93F IN 2002
LOW 47F IN 1824
PRECIP 5.75 INCHES IN 1955 [DIANE] PEAK GUST 46 MPH WNW IN 2007

TODAY’S REPORT PREPARED BY: Benjamin Turner