Tuesday, August 17, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, AUGUST 17, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0454E
SUNSET: 1843E
WARMER AND MORE HUMID WITH SOME BUILDING CUMULUS IN THE
AFTERNOON HOURS….
Today we saw around 30 miles of visibility due to haze,
and a consistent southwesterly wind a little below 10 mph
on average. Dew points were in the mid to upper 60’s, with
temperatures climbing into the low 80’s. The cloud layer
became thicker at lower levels as the day progressed.
No convective showers are seen as of yet.
The high so far today is 82F, a degree above the daily normal
maximum of 81F. The low so far today is 63F, which is the same
as the daily normal minimum.
Today’s Observations:
7 A.M.
Weather: Scattered altocumulus, broken cirrostratus
Temperature: 67F; Dew Point: 64F; Relative Humidity: 89%
Wind: WSW @ 5 kts, light
Sea-level pressure: 30.25 in. Hg; rising steadily
Visibility: 30 miles, hazy
6-hr Max temp: 67F
6-hr Min temp: 63F
24-hr Precip: 0.00 ins.
BHO SA 1155 140 SCT 250 BKN 30 243/67/64/2405/025/ HAZY WND
LGT/ 8/076 53011 10067 20063
10 A.M.
Weather: Scattered cumulus and altocumulus, broken
cirrostratus
Temperature: 78F; Dew Point: 65F; Relative Humidity: 64%
Wind: SSW @ 7 kts
Sea-level pressure: 30.24 in Hg; steady then falling
Visibility: 35 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 50 SCT 140 SCT 250 BKN 35 240/67/64/2207/024/
HAZY/ 8/156 57003
1 P.M.
Weather: Scattered cumulus, broken altocumulus and cirrostratus
Temperature: 81F, Dew point: 67F; Relative Humidity: 64%
Wind: SSW @ 7 kts
Sea-level pressure: 30.20 in Hg; falling steadily
Visibility: 35 miles, hazy
6-hr Max temp: 82F
6-hr Min temp: 67F
6-hr Precip: 0.00 ins.
BHO SA 1755 45 SCT 140 BKN 250 BKN 35 228/81/67/2207/020/ HAZY/
8/256 58012 10082 20067
SUMMARY FOR MONDAY, AUGUST 16, 2021
TEMPERATURE (DEGREES F)
MAX…….78 NORMAL…..81
MIN…….59 NORMAL…..63
MEAN……69 NORMAL…..72
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………. -3
TOTAL DEPARTURE FOR THE MONTH…………………..+8 [+0.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………….0 DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE SEASON…………..28 DEPARTURE…….+18
TOTAL HEATING UNITS LAST SEASON TO DATE……….1 DEPARTURE…….+27
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….4 DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE MONTH…………..127 DEPARTURE……..+7
TOTAL COOLING UNITS FOR THE SEASON………….506 DEPARTURE……..-1
TOTAL COOLING UNITS LAST SEASON TO DATE……..673 DEPARTURE……-167
PEAK WIND GUST (MPH):
Official……………….15 S @ 11:58 P.M.
AEROVANE (south tower)…..15 S @ 9:06 P.M.
VECTOR #2 (south tower)….15 @ 11:58 P.M.
DAVIS #2 (south tower)…..16 S @ 9:00 P.M.
ASOS………..OUT OF SERVICE D/T RENOVATIONS
VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
RMY…………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………12 S @ 9:12 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..12 @ 11:59 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………13 S @ 9:07 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY AVERAGE……..OUT OF SERVICE D/T RENOVATIONS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…… 6.4 NE [153 total miles]
VECTOR #2……………. 7.4
DAVIS #2…………….. 7.0 NE
RMY……………..OUT OF SERVICE D/T RENOVATIONS
ASOS…………….OUT OF SERVICE D/T RENOVATIONS
VECTOR #1………..OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…………OUT OF SERVICE D/T RENOVATIONS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.13
TOTAL PRECIPITATION FOR THE MONTH………….2.76 DEPARTURE….+0.67
TOTAL PRECIPITATION FOR THE YEAR………….37.73 DEPARTURE….+5.20
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 77/58/68/-5/T/589/68 23 SSW AERO 24 SSW RMY N/A
08/02 78/61/70/-3/T/821/95 28 WNW AERO 28 WNW RMY N/A
08/03 76/60/68/-5/0.00/302/35 15 N AERO 16 N RMY N/A
08/04 75/61/68/-5/0.71/077/09 21 ESE AERO 21 ESE RMY N/A
08/05 68/61/65/-8/1.68/000/00 28 NE AERO 28 NE RMY N/A
08/06 85/62/74/+1/0.00/727/85 19 S AERO 20 WSW RMY N/A
08/07 88/66/77/+4/0.00/520/61 23 SW AERO 23 SW RMY N/A
08/08 80/67/74/+2/T/128/15 16 SW AERO 16 WNW RMY N/A
08/09 75/64/70/-2/0.25/076/09 22 ENE AERO 21 NE RMY N/A
08/10 78/63/71/-1/0.12/…/.. 19 S AERO 20 S RMY N/A
08/11 89/70/80/+8/0.00/…/.. 29 SSW AERO 28 SSW RMY N/A
08/12 91/71/81/+9/T/…/.. 36 WSW AERO 37 WSW RMY N/A TSTM
08/13 92/73/83/+11/0.00/…/.. 18 WSW AERO 18 WSW RMY N/A
08/14 87/69/78/+6/T/…/.. 25 W AERO 25 NNW RMY N/A
08/15 80/62/71/-1/0.00/…/.. 19 NNW AERO 20 NNW RMY N/A
08/16 78/59/69/-3/0.00/…/.. 15 S AERO 15 S RMY N/A
08/17 The low since midnight is 63F, the daily normal low is 63F
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 49F IN 1918, 1941
PRECIP 4.64 INCHES IN 1955 [DIANE]
PEAK GUST 46 MPH WNW IN 2007
TODAY’S REPORT PREPARED BY: Benjamin Turner
