Wednesday, August 19, 2020

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

WEDNESDAY, AUGUST 19, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

COOL AND OVERCAST WITH SOME DISTANT
SHOWERS BEING SEEN IN THE AFTERNOON….

We observed excellent visibility today,
reaching 80 miles by 10 A.M. Wind was
northwesterly and below 10 mph on
average. The max gust so far today is
16 mph. Skies were mostly cloudy this
morning, turning overcast by noontime.
With the increase in cloud cover, distant
showers were seen to the south and north
at the 1 P.M. observation. No showers
have reached the observatory as of yet.

The high so far today is 81F, 2 degrees
above the daily normal maximum of 79F.
The low since midnight is 60F, 2 degrees
below the normal minimum of 62F.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus castellanus, broken
cirrus
Temperature: 65F; Dew Point: 55F; Relative Humidity: 66%
Wind: NW at 5 kts, light
Sea-level pressure: 29.95 ins. Hg: rising steadily
Visibility: 75 miles
6-hr Max temp: 65F
6-hr Min temp: 60F
24-hr Precip: 0.00 ins.
BHO SA 1155 150 SCT 250 BKN 75 141/65/55/3305/995/
WND LGT/ 8/082 53016 10065 20060

10 A.M.
Weather: Scattered altocumulus castellanus, broken
cirrostratus, few cumulus
Temperature: 74F; Dew Point: 51F; Relative Humidity: 46%
Wind: W at 3 kts, light and variable
Sea-level pressure: 29.95 ins. Hg: falling steadily
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 150 SCT 250 BKN 80 140/74/51/2603/995/ FEW
CU ALQDS WND L/V/ 8/188 58001

1 P.M.
Weather: Scattered stratocumulus, overcast nimbostratus,
distant virga SE-SW and N
Temperature: 75F; Dew Point: 50F; Relative Humidity: 42%
Wind: NW at 9 kts
Sea-level pressure: 29.94 ins. Hg: falling, then steady
Visibility: 80 miles
6-hr Max temp: 81F
6-hr Min temp: 64F
6-hr Precip: 0.00 ins.
BHO SA 1755 40 SCT 80 OVC 80 139/75/50/3209/994/ VIRGA
DSNT SE-SW AND N/ 8/82/ 55001 10081 20065

SUMMARY FOR TUESDAY, AUGUST 18, 2020

TEMPERATURE (DEGREES F)
MAX…..84   NORMAL…..79
MIN…..63   NORMAL…..62
MEAN….74   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL……………..+3
TOTAL DEPARTURE FOR THE MONTH……………..+77 [+4.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………..9   DEPARTURE…….+3
TOTAL COOLING UNITS FOR THE MONTH…………….196  DEPARTURE……+75
TOTAL COOLING UNITS FOR THE SEASON……………683  DEPARTURE…..+211
TOTAL COOLING UNITS LAST SEASON TO DATE……….540  DEPARTURE…..+143

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..23 W   AT  1:25 P.M.
AERO…………………….23 W   AT  1:33 P.M.
ASOS…………………….23 W   AT  1:40 P.M.
DAVIS……………………26 W   AT  4:54 P.M
RMY 23  MERLIN 24
FASTEST MILE FOR YESTERDAY………………….16 W   AT 12:56 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 W   AT 12:55 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………19 W   AT 12:55 P.M.
AVERAGE WIND SPEED AND DIRECTION……………10.1 W
ASOS…………………….9.6
DAVIS…………………..10.3 WSW [254 deg.]

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……….0.84  DEPARTURE……-1.65
ASOS…………..0.85
TOTAL PRECIPITATION FOR THE YEAR……….29.91  DEPARTURE……-3.57
ASOS………….30.66

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  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  The low since midnight is 60F, 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 19
HIGH 90F IN 1906, 1966, 2002
LOW 48F IN 1958
PRECIP 7.02 INCHES IN 1955 [DIANE – RECORD FOR MONTH] PEAK GUST 78 MPH ENE IN 1991 – HURRICANE BOB

RECORDS FOR AUGUST 20
HIGH 93F IN 1937
LOW 48F IN 1896, 1905, 1949
PRECIP 2.71 INCHES IN 1970
PEAK GUST 47 MPH W IN 1983

TODAY’S REPORT PREPARED BY: Benjamin Turner