Monday, August 23, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, AUGUST 23, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0500E
SUNSET: 1833E
A DECENTLY ACTIVE WEATHER DAY FOLLOWING HENRI’S DEPARTURE….
Tropical storm Henri moved through southern New England yesterday,
bringing periods of rain and gusty winds to the region. Today there
are two confirmed tornadoes formed off the back of this system.
The location of the first seen tornado was in Marlborough, while the
other was seen in Acton.
The sky was obscured due to a fog this morning that dissipated, leaving
some pretty magnificent towering cumulus clouds. Visibility went from
an 1/8th mile this morning to 40 miles by the 1 P.M. observation.
The storm total rainfall from Henri was only 0.78 inches, and the
peak gust for the storm was a much lower than expected 47 mph. Total
rainfall on the month is currently 4.17 inches, which is an inch and
a quarter above normal. The annual rain total is 39.14 inches, 5.86
inches above normal for the last month of summer.
The max gust was 47 mph for yesterday, beating the old record of 44 mph
set in 1987!
The high so far today is 81F, 2 degrees above the daily normal maximum
of 80F. The low so far today is 69F, which is 7 degrees above the daily
normal minimum of 62F.
Today’s Observations:
7 A.M.
Weather: Fog
Temperature: 70F; Dew Point: 70F; Relative Humidity: 100%
Wind: E at 5 kts
Sea-level pressure: 1013.4 mb; 29.93 in. Hg; rising steadily
Visibility: 1/8 mile, fog
6-hr Max temp: 70F
6-hr Min temp: 69F
24-hr Precip: 0.63 ins.
BHO SA 1155 X W3 1/8F 134/70/70/0905/993/ WND LGT/ 8//// 70063
53006 10070 20069
10 A.M.
Weather: Broken towering cumulus and cirrocumulus
Temperature: 78F; Dew Point: 72F; Relative Humidity: 83%
Wind: SE @ 8G14 kts
Sea-level pressure: 1013.0 mb; 29.92 in Hg; falling unsteadily
Visibility: 8 miles, thin fog
3-hr Precip: 0.00 ins.
BHO SA 1455 20 BKN 300 BKN 8 130/78/72/1308G14/992/ THN F ALQDS
BINOVC OVHD/ 8/209 56004
1 P.M.
Weather: Broken towering cumulus and cirrocumulus
Temperature: 79F, Dew point: 72F; Relative Humidity: 79%
Wind: ESE @ 8G16 kts
Sea-level pressure: 1011.6 mb; 29.89 in Hg; falling steadily
Visibility: 40 miles
6-hr Max temp: 81F
6-hr Min temp: 70F
6-hr Precip: 0.00 ins.
BHO SA 1755 20 BKN 300 BKN 40 116/79/72/1108G16/989/ 8/209 58014 10081
20070
SUMMARY FOR SUNDAY, AUGUST 22, 2021
TEMPERATURE (DEGREES F)
MAX…….74 NORMAL…..80
MIN…….67 NORMAL…..62
MEAN……71 NORMAL…..71
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………..+0
TOTAL DEPARTURE FOR THE MONTH…………………..28 [+1.1 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……..-6
TOTAL HEATING UNITS FOR THE SEASON…………..27 DEPARTURE…….+15
TOTAL HEATING UNITS LAST SEASON TO DATE……….1 DEPARTURE…….+27
COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….6 DEPARTURE……..+0
TOTAL COOLING UNITS FOR THE MONTH…………..184 DEPARTURE…….+24
TOTAL COOLING UNITS FOR THE SEASON………….563 DEPARTURE…….+17
TOTAL COOLING UNITS LAST SEASON TO DATE……..701 DEPARTURE……-149
PEAK WIND GUST (MPH):
Official……………….47 ESE @ 1:31 P.M.
AEROVANE (south tower)…..48 ESE @ 1:27 P.M.
VECTOR #2 (south tower)….51 @ 1:28 P.M.
DAVIS #2 (south tower)…..47 ESE @ 1:35 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………………32 ESE @ 1:34 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..32 @ 1:32 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………32 ESE @ 1:30 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……17.8 NE [428 total miles]
VECTOR #2…………….18.0
DAVIS #2……………..18.1
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…….0.63 DEPARTURE….+0.50
TOTAL PRECIPITATION FOR THE MONTH………….4.17 DEPARTURE….+1.33
TOTAL PRECIPITATION FOR THE YEAR………….39.14 DEPARTURE….+5.86
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 86/69/78/+7/0.00/…/.. 17 S AERO 17 S RMY N/A
08/22 74/67/71/0/…./…/.. 47 ESE AERO 48 ESE RMY N/A
08/23 The low since midnight is 69F, 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 23
HIGH 89F IN 2020
LOW 45F IN 1923
PRECIP 2.21 INCHES IN 2020
PEAK GUST 60e MPH NW IN 1940, 60 WNW IN 2020* [*THUNDERSTORM]
RECORDS FOR AUGUST 24
HIGH 92F IN 1947
LOW 43F IN 1971
PRECIP 2.40 INCHES IN 2010
PEAK GUST 54 MPH W IN 1986
TODAY’S REPORT PREPARED BY: Benjamin Turner
