Wednesday, August 18, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, AUGUST 18, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0455E
SUNSET: 1844E
MOSTLY CLOUDY WITH DECENT VISIBILITY AND A WARM
SOUTHWESTERLY WIND….
Today we saw around 40 miles of visibility with a consistent
southwesterly wind around 10 mph on average. Dew points were
in the mid to upper 60’s, with temperatures climbing into the
low 80’s. Clouds are covering more than half of the sky for
most of the day, but the summit has been sunny for the most
part.
The high so far today is 86F, 5 degrees above the daily normal
maximum of 81F. The low so far today is 66F, which is 3 degrees
above the daily normal minimum of 63F.
Today’s Observations:
7 A.M.
Weather: Broken altocumulus and cirrus
Temperature: 70F; Dew Point: 64F; Relative Humidity: 81%
Wind: SW @ 8 kts
Sea-level pressure: 30.26 in. Hg; rising steadily
Visibility: 40 miles
6-hr Max temp: 70F
6-hr Min temp: 66F
24-hr Precip: 0.00 ins.
BHO SA 1155 120 BKN 250 BKN 40 248/70/64/2208/026/ 8/051
53006 10070 20066
10 A.M.
Weather: Broken altocumulus and cirrus
Temperature: 78F; Dew Point: 63F; Relative Humidity: 61%
Wind: SW @ 9 kts
Sea-level pressure: 30.24 in Hg; falling steadily
Visibility: 45 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 120 BKN 250 BKN 45 243/78/63/2209/024/ 8/071
58005
1 P.M.
Weather: Broken altocumulus and cirrus, few cumulus
Temperature: 83F, Dew point: 67F; Relative Humidity: 59%
Wind: SSW @ 10 kts
Sea-level pressure: 30.21 in Hg; falling steadily
Visibility: 40 miles
6-hr Max temp: 86F
6-hr Min temp: 70F
6-hr Precip: 0.00 ins.
BHO SA 1755 120 BKN 250 BKN 40 234/83/67/2110/021/ FEW CU ALQDS/
8/171 58009 10086 20070
SUMMARY FOR TUESDAY, AUGUST 17, 2021
TEMPERATURE (DEGREES F)
MAX…….82 NORMAL…..81
MIN…….63 NORMAL…..63
MEAN……73 NORMAL…..72
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………. +1
TOTAL DEPARTURE FOR THE MONTH…………………..+9 [+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…………….8 DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE MONTH…………..135 DEPARTURE……..+8
TOTAL COOLING UNITS FOR THE SEASON………….514 DEPARTURE………0
TOTAL COOLING UNITS LAST SEASON TO DATE……..674 DEPARTURE……-160
PEAK WIND GUST (MPH):
Official……………….22 SSW @ 6:55 P.M.
AEROVANE (south tower)…..23 SSW @ 6:55 P.M.
VECTOR #2 (south tower)….23 @ 6:55 P.M.
DAVIS #2 (south tower)…..21 SSW @ 6:55 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………………16 SSW @ 6:52 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17 @ 6:55 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 SSW @ 6:56 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…… 9.4 SW [225 total miles]
VECTOR #2……………. 10.1
DAVIS #2…………….. 9.7 SW
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….-0.12
TOTAL PRECIPITATION FOR THE MONTH………….2.76 DEPARTURE….+0.55
TOTAL PRECIPITATION FOR THE YEAR………….37.73 DEPARTURE….+5.08
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 82/63/73/1/0.00/…/.. 22 SSW AERO 23 SSW RMY N/A
08/18 The low since midnight is 66F, 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 18
HIGH 93F IN 2002
LOW 49F IN 1918, 1941
PRECIP 4.64 INCHES IN 1955 [DIANE]
PEAK GUST 46 MPH WNW IN 2007
RECORDS FOR AUGUST 19
HIGH 92F IN 2019
LOW 48F IN 1958
PRECIP 8.07 INCHES IN 1955 [DIANE – RECORD FOR MONTH]
PEAK GUST 78 MPH ENE IN 1991 – HURRICANE BOB
TODAY’S REPORT PREPARED BY: Benjamin Turner
