Sunday, August 15, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, AUGUST 15, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0452E
SUNSET: 1845E
PLENTY OF SUNSHINE WITH MUCH COOLER AND DRIER AIR…
What a difference today compared to the past 4 days. After a stretch of
hot and humid weather, today is offering welcomed relief with
temperatures in the upper 70s to low 80s. More importantly, the
dewpoint is about 15-20 degrees lower today making it feel very
refreshing!
With the drier air mass in place, visibility has been excellent today
holding around 70 miles all day.
The wind has been mainly on the light side out of the north, however
the direction has become rather variable early this afternoon.
The high so far today is 79F, 2 degrees below the daily normal maximum
of 81F. The low so far today is 62F, which is 1 degree below the daily
normal minimum of 63F.
Today’s Observations:
7 A.M.
Weather: Clear, few cirrus all quadrants
Temperature: 66F; Dew Point: 55F; Relative Humidity: 69%
Wind: NNW @ 7 kts
Sea-level pressure: 30.21 in. Hg; rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 69F
6-hr Min temp: 62F
24-hr Precip: Trace
BHO SA 1155 CLR 70 229/66/55/3307/021/ FEW CI ALQDS/ 8/001 51016
70000 10069 20062
10 A.M.
Weather: Thin scattered cirrus
Temperature: 74F; Dew Point: 55F; Relative Humidity: 51%
Wind: N @ 5 kts, wind light
Sea-level pressure: 30.21 in Hg; rising, then falling
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 -SCT 70 231/74/55/3505/021/ WND LGT/ 8/001 53002
1 P.M.
Weather: Thin broken cirrus, few small cumulus distant S-W-N
Temperature: 76F, Dew point: 54F; Relative Humidity: 47%
Wind: WNW @ 6 kts, wind SW variable NNW
Sea-level pressure: 30.20 in Hg; falling steadily
Visibility: 70 miles
6-hr Max temp: 79F
6-hr Min temp: 66F
6-hr Precip: 0.00 ins.
BHO SA 1755 E250 -BKN 70 227/76/54/2906/020/ FEW SML CU DSNT S-W-N WND 22V33/
8/101 57004 10079 20066
SUMMARY FOR SATURDAY, AUGUST 14, 2021
TEMPERATURE (DEGREES F)
MAX…….87 NORMAL…..81
MIN…….69 NORMAL…..63
MEAN……78 NORMAL…..72
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………. +6
TOTAL DEPARTURE FOR THE MONTH………………….+12 [+0.7 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……………13 DEPARTURE……..+6
TOTAL COOLING UNITS FOR THE MONTH…………..117 DEPARTURE…….+10
TOTAL COOLING UNITS FOR THE SEASON………….496 DEPARTURE……..+3
TOTAL COOLING UNITS LAST SEASON TO DATE……..672 DEPARTURE……-176
PEAK WIND GUST (MPH):
Official……………….25 W @ 3:09 P.M.
AEROVANE (south tower)…..25 NNW @ 8:21 P.M.
VECTOR #2 (south tower)….27 @ 3:09 P.M.
DAVIS #2 (south tower)…..26 W @ 3:10 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………………17 W @ 2:45 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 @ 3:09 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 W @ 3:10 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…… 9.0 W [217 total miles]
VECTOR #2……………. 9.9
DAVIS #2…………….. 9.8 WNW
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……TRACE DEPARTURE….-0.13
TOTAL PRECIPITATION FOR THE MONTH………….2.76 DEPARTURE….+0.93
TOTAL PRECIPITATION FOR THE YEAR………….37.73 DEPARTURE….+5.46
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 The low since midnight is 62F, 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 15
HIGH 95F IN 1928
LOW 47F IN 1964
PRECIP 1.89 INCHES IN 2011
PEAK GUST 44e MPH S IN 1941
RECORDS FOR AUGUST 16
HIGH 95F IN 1944
LOW 50F IN 1927
PRECIP 1.31 INCHES IN 1951
PEAK GUST 45e MPH N IN 1951
TODAY’S REPORT PREPARED BY: Matt Douglas
