Saturday, August 21, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, AUGUST 21, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0458E
SUNSET: 1836E
PRETTY SKIES WITH A MIX OF SUN AND CLOUDS WITHIN A PURE TROPICAL AIR MASS…
The sky has been decorated nicely with tropical cumulus clouds with
a deep blue sky as the backdrop! This kind of phenomena is normal
for the deep tropics. Fred helped to import a pure tropical air mass
into the region straight from the Caribbean. In addition to the pretty
sky, visibility has been pretty decent despite the high dew point air.
We’ve been able to see 50-60 miles once some thin fog dissipated early
this morning.
Of course today is the proverbial calm before the storm. Hurricane
Henri (Ahn-ree) is currently located about 240 miles east-northeast
of Cape Hatteras, NC moving north-northeast at 18mph. We are expecting
to start seeing effects here at Blue Hill by morning. It should be an
interesting day here on the hill tomorrow!
The high so far today is 86F, 6 degree above the daily normal maximum
of 80F. The low so far today is 70F, which is 8 degrees above the daily
normal minimum of 62F.
Today’s Observations:
7 A.M.
Weather: Scattered altostratus/altocumulus, thin broken cirrus,
few cumulus/towering cumulus distant all quadrants, patchy ground fog
distant SSE-SSW
Temperature: 74F; Dew Point: 71F; Relative Humidity: 90%
Wind: Calm
Sea-level pressure: 1014.9mb; 29.97 in. Hg; Rising, then steady
Visibility: 30 miles
6-hr Max temp: 74F
6-hr Min temp: 70F
24-hr Precip: 0.01 ins.
BHO SA 1155 100 SCT E250 -BKN 30 149/74/71/0000/997/ FEW CU/TCU DSNT ALQDS PTCHY GF DSNT SSE-SSW WND CALM/ 8/271 51004 70001 10074 20070
10 A.M.
Weather: Scattered stratocumulus, scattered cumulus, thin scattered cirrus
Temperature: 81F; Dew Point: 72F; Relative Humidity: 80%
Wind: SSW @ 3 kts, wind light
Sea-level pressure: 1015.7mb; 29.99 in Hg; Rising, then steady
Visibility: 60 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 20 SCT 40 SCT 250 -SCT 60 157/81/72/2003/999/ WND L/V/ 8/801 51008
1 P.M.
Weather: Scattered stratocumulus, broken cumulus, thin broken cirrus,
small cumulonimbus distant N
Temperature: 85F, Dew point: 70F; Relative Humidity: 61%
Wind: S @ 7 kts
Sea-level pressure: 1015.3mb; 29.98 in Hg; Falling, then rising
Visibility: 50 miles
6-hr Max temp: 86F
6-hr Min temp: 74F
6-hr Precip: 0.00 ins.
BHO SA 1755 25 SCT E45 BKN 250 -BKN 50 153/85/70/1807/998/ SML CB DSNT N/ 8/361 55004 10086 20074
SUMMARY FOR FRIDAY, AUGUST 20, 2021
TEMPERATURE (DEGREES F)
MAX…….78 NORMAL…..80
MIN…….70 NORMAL…..62
MEAN……74 NORMAL…..71
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………..+3
TOTAL DEPARTURE FOR THE MONTH…………………..21 [+0.9 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……..-5
TOTAL HEATING UNITS FOR THE SEASON…………..28 DEPARTURE…….+16
TOTAL HEATING UNITS LAST SEASON TO DATE……….1 DEPARTURE…….+27
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………… 9 DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE MONTH…………..165 DEPARTURE…….+18
TOTAL COOLING UNITS FOR THE SEASON………….544 DEPARTURE…….+10
TOTAL COOLING UNITS LAST SEASON TO DATE……..691 DEPARTURE……-147
PEAK WIND GUST (MPH):
Official……………….21 WSW @ 3:26 A.M.
AEROVANE (south tower)…..N/A @ N/A
VECTOR #2 (south tower)….22 @ 3:26 A.M.
DAVIS #2 (south tower)…..20 W @ 3:12 A.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………………15 SSW @ 12:30 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 @ 1:03 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 WSW @ 3:27 A.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…… 5.0 NNW [121 total miles]
VECTOR #2……………. 6.3
DAVIS #2…………….. 5.8 WSW
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…….0.01 DEPARTURE….-0.12
TOTAL PRECIPITATION FOR THE MONTH………….3.39 DEPARTURE….+0.80
TOTAL PRECIPITATION FOR THE YEAR………….38.36 DEPARTURE….+5.33
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 86/66/76/+5/0.00/…/.. 21 SSW AERO 22 SSW RMY N/A
08/19 81/69/75/+4/0.62/…/.. 41 S AERO 43 S RMY N/A
08/20 78/70/74/+3/0.01/…/.. 21 WSW AERO N/A RMY N/A
08/21 The low since midnight is 70F, 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 21
HIGH 92F IN 1937, 1995
LOW 47F IN 1982
PRECIP 2.84 INCHES IN 1888
PEAK GUST 54 MPH WSW IN 2004
RECORDS FOR AUGUST 22
HIGH 90F IN 1939
LOW 42F IN 1894
PRECIP 2.28 INCHES IN 1935
PEAK GUST 44 MPH SSW IN 1987
TODAY’S REPORT PREPARED BY: Matt Douglas
