Tuesday, August 24, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, AUGUST 24, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0501E
SUNSET: 1831E
HOT AND HUMID, BUT WITH SURPRISINGLY GOOD VISIBILITY….
Today began foggy, with only a 1/16th mile of visibility. By the 10 A.M.
observation we were seeing an impressive 65 miles. This is despite dew
points climbing into the lower 70’s!
Rain overnight totaled 1.18 inches. This brings the rain total on
the month to 5.35 inches, 2.39 inches above normal. The annual total
is boosted to 40.32 inches, 6.92 inches above the average total up
to this calendar day. The summer (June-August) rainfall total has
climbed to 19.66 inches, and this season will be among the top ten
wettest summers on record.
The final storm impacts at the Observatory from Tropical Storm Henri,
which crossed southern New England yesterday as a post-tropical system,
include a rainfall total of 1.96 inches of rain from early Sunday through
Monday evening and a peak wind gust to 47 mph from the ESE at 1:31 PM EST
on Sunday afternoon shortly after the storm made landfall in the south-
western corner of Rhode Island before moving inland to our west.
The high so far today is 84F, 5 degrees above the daily normal maximum
of 79F. 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: 68F; Dew Point: 68F; Relative Humidity: 100%
Wind: N at 8G14 kts
Sea-level pressure: 1011.5 mb; 29.87 in. Hg; rising steadily
Visibility: 1/16 mile, fog
6-hr Max temp: 70F
6-hr Min temp: 67F
24-hr Precip: 1.18 ins.
BHO SA 1155 X W2 1/16F 115/68/68/3608G14/987/ 8//// 70118 53025
10070 20067
10 A.M.
Weather: Broken towering cumulus and cirrus
Temperature: 75F; Dew Point: 71F; Relative Humidity: 88%
Wind: NW @ 4 kts, light and variable
Sea-level pressure: 1013.3 mb; 29.92 in Hg; rising steadily
Visibility: 65 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 20 BKN 250 BKN 65 133/75/71/3304/992/ WND L/V/ 8/202
53018
1 P.M.
Weather: Broken towering cumulus and cirrus
Temperature: 81F, Dew point: 71F; Relative Humidity: 72%
Wind: WNW @ 10 kts
Sea-level pressure: 1013.6 mb; 29.93 in Hg; rising then falling
Visibility: 65 miles
6-hr Max temp: 84F
6-hr Min temp: 68F
6-hr Precip: 0.00 ins.
BHO SA 1755 20 BKN 250 BKN 65 136/81/71/2910/993/ 8/202 51003
10084 20068
SUMMARY FOR MONDAY, AUGUST 23, 2021
TEMPERATURE (DEGREES F)
MAX…….83 NORMAL…..79
MIN…….68 NORMAL…..62
MEAN……76 NORMAL…..71
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………..+5
TOTAL DEPARTURE FOR THE MONTH…………………..32 [+1.2 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……………11 DEPARTURE……..+5
TOTAL COOLING UNITS FOR THE MONTH…………..194 DEPARTURE…….+28
TOTAL COOLING UNITS FOR THE SEASON………….573 DEPARTURE…….+20
TOTAL COOLING UNITS LAST SEASON TO DATE……..723 DEPARTURE……-150
PEAK WIND GUST (MPH):
Official……………….25 SSE @ 7:10 P.M.
AEROVANE (south tower)…..26 SSE @ 7:18 P.M.
VECTOR #2 (south tower)….26 @ 7:10 P.M.
DAVIS #2 (south tower)…..29 S @ 7:11 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 SSE @ 7:16 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 @ 3:52 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 ESE @ 9:00 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…….9.6 ESE [231 total miles]
VECTOR #2…………….10.2
DAVIS #2……………..10.0
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…….1.18 DEPARTURE….+1.06
TOTAL PRECIPITATION FOR THE MONTH………….5.35 DEPARTURE….+2.39
TOTAL PRECIPITATION FOR THE YEAR………….40.32 DEPARTURE….+6.92
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/-1/0.12/203/24 19 S AERO 20 S RMY N/A
08/11 89/70/80/+8/0.00/667/79 29 SSW AERO 28 SSW RMY N/A
08/12 91/71/81/+9/T/580/69 36 WSW AERO 37 WSW RMY N/A TSTM
08/13 92/73/83/+11/0.00/696/83 18 WSW AERO 18 WSW RMY N/A
08/14 87/69/78/+6/T/601/72 25 W AERO 25 NNW RMY N/A
08/15 80/62/71/-1/0.00/800/96 19 NNW AERO 20 NNW RMY N/A
08/16 78/59/69/-3/0.00/564/68 15 S AERO 15 S RMY N/A
08/17 82/63/73/1/0.00/555/67 22 SSW AERO 23 SSW RMY N/A
08/18 86/66/76/+5/0.00/338/41 21 SSW AERO 22 SSW RMY N/A
08/19 81/69/75/+4/0.62/222/27 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 74/66/70/-1/0.78/…/.. 47 ESE AERO 48 ESE RMY N/A
08/23 83/68/76/+5/…./…/.. 25 SSE AERO 26 SSE RMY N/A
08/24 The low since midnight is 67F, 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 24
HIGH 92F IN 1947
LOW 43F IN 1971
PRECIP 2.40 INCHES IN 2010
PEAK GUST 54 MPH W IN 1986
RECORDS FOR AUGUST 25
HIGH 93F IN 1947, 1948, 2007
LOW 41F IN 1940
PRECIP 2.69 INCHES IN 2010
PEAK GUST 60e MPH SSW IN 1941
TODAY’S REPORT PREPARED BY: Benjamin Turner
