Sunday, August 20, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, AUGUST 20, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0456E
SUNSET: 1838E
HAZY SUNSHINE AND WARM WITH THE RETURN OF WILDFIRE SMOKE…
Other than a few altocumulus and altocumulus castellanus during
the mid morning period, skies have been void of any clouds most
of the day. However the abundant sunshine is being filtered
a bit by the haziness caused by the return of some wildfire
smoke to the region. The sky looks rather milky and this
effect has been increasing as we move into the afternoon hours.
Temperatures have however warmed into the upper 70s and low
80s across the area. The dew point, which was at nice levels
since yesterday, has been inching upwards today, reaching near
60F early this afternoon.
The wind started the day on the brisk side, but has diminished
a bit from the early morning levels. The average speed for the
day thus far is around 11mph. The peak gust thus far, occurring
at around 3:30 this morning, is 23mph.
Visibility has been restricted today due to the haziness from
the smoke. The view has actually decreased this afternoon to
around 20 miles, after being upwards to 30 miles this morning.
The maximum temperature so far today has been 80F, which is
equal to the normal high of 80F. The minimum temperature since
midnight is 59F, which is 3 degrees below the normal low of 62F.
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Today’s Observations:
7 A.M.
Weather: Clear, thin smoke layer aloft all quadrants
Temperature: 62F; Dew Point: 55F; Relative Humidity: 77%
Wind: W @ 12 kts
Sea-level pressure: 1018.4 mb; 30.07 in. Hg: rising, then more rapidly
Visibility: 30 miles, hazy
6-hr Max temp: 62F
6-hr Min temp: 59F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 30 184/62/55/2812/007/ THN K LYR ALF ALQDS HAZY/
8/000 53015 10062 20059
10 A.M.
Weather: Clear, few altostratus/castellanus distant W-N-E,
thin smoke layer aloft all quadrants
Temperature: 72F; Dew Point: 58F; Relative Humidity: 61%
Wind: W @ 8 kts
Sea-level pressure: 1019.0 mb; 30.09 in. Hg: rising, then more rapidly
Visibility: 30 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 30 190/72/58/2708/009/ FEW AC/ACC DSNT W-N-E
THN K LYR ALF ALQDS HAZY/ 8/080 53006
1 P.M.
Weather: Clear, thin smoke layer aloft all quadrants
Temperature: 79F; Dew Point: 59F; Relative Humidity: 51%
Wind: W @ 8 kts, wind SW variable WNW
Sea-level pressure: 1018.3 mb; 30.07 in. Hg: falling, then more slowly
Visibility: 20 miles, hazy
6-hr Max temp: 79F
6-hr Min temp: 62F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 20 183/79/59/2608/007/ THN K LYR ALF ALQDS HAZY
WND 22V29/ 8/000 56007 10080 20062
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SUMMARY FOR SATURDAY, AUGUST 19, 2023
TEMPERATURE (DEGREES F)
MAX…….72 NORMAL…..80
MIN…….57 NORMAL…..63
MEAN……65 NORMAL…..71
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-6
TOTAL DEPARTURE FOR THE MONTH…………………-36 [-2.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………….0 DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE SEASON……………0 DEPARTURE…….-12
TOTAL HEATING UNITS LAST SEASON TO DATE……….0 DEPARTURE………0
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-7
TOTAL COOLING UNITS FOR THE MONTH…………..102 DEPARTURE…….-39
TOTAL COOLING UNITS FOR THE SEASON………….524 DEPARTURE……..-3
TOTAL COOLING UNITS LAST SEASON TO DATE……..719 DEPARTURE……-195
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated
F420C (Official)……….E29 W @ 01:29 P.M.
VECTOR #1 (1-Sec)……….30 W @ 01:29 P.M.
VECTOR #2 (1-Sec)……….28 W @ 01:29 P.M.
DAVIS #1……………….29 WSW @ 01:29 P.M.
DAVIS #2 ………………27 W @ 01:29 P.M.
RMY #1 (Instantaneous)…..30 W @ 01:29 P.M.
RMY #2 (Instantaneous)…..28 W @ 01:29 P.M.
MERLIN…………………27 W
RICHARDS (C5C) (Inst)……29 @ 01:29 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL……………….21 W @ 01:07 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE……………20 @ 01:30 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE……………19 @ 01:30 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…………….21 WSW @ 01:30 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE…………….19 W @ 01:30 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE………………20 W @ 01:30 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE………………19 W @ 01:30 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……….19 @ 01:30 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………11.6 WSW [279 total miles]
VECTOR #1……………….11.6
VECTOR #2……………….11.9
DAVIS #1………………..11.9 WSW
DAVIS #2………………..11.9 W
RMY #1………………….11.3 WSW
RMY #2………………….11.9 W
RICHARDS (C5C)…………..11.5
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH…………..2.95 DEPARTURE…..+0.50
TOTAL PRECIPITATION FOR THE YEAR…………..37.72 DEPARTURE…..+4.57
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PRELIMINARY CLIMATE SUMMARY FOR AUGUST CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY: R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data
8/1 76/58/67/-6/0.00/763/88 24 NW VEC1 24 NW RMY 24
8/2 75/54/65/-8/0.00/830/96 23 SSW VEC1 22 SSW RMY 23
8/3 79/59/69/-4/0.00/725/84 32 SSW VEC1 34 SSW RMY 34
8/4 77/62/70/-3/T/172/20 29 SSW VEC1 29 SSW RMY 29
8/5 83/66/75/+2/0.00/523/61 18 NW VEC1 16 WNW RMY 17
8/6 82/60/71/-2/0.00/839/98 20 W VEC1 19 W RMY 19
8/7 72/65/69/-4/0.14/034/04 29 SSE VEC1 30 SSE RMY 29
8/8 82/68/75/+3/0.47/187/22 39 S VEC1 42 S RMY 42
8/9 82/66/74/+2/0.00/756/89 39 WNW VEC1 38 WNW RMY 38
8/10 83/64/74/+2/0.02/254/30 28 SSW VEC1 27 SSW RMY 28
8/11 80/63/72/+0/0.07/810/96 36 W VEC1 36 W RMY 38
8/12 84/61/73/+1/0.00/733/87 26 SSW VEC1 26 SSW RMY 26
8/13 84/68/76/+4/0.07/629/75 26 SSW VEC1 26 SSW RMY 27 TSTM
8/14 82/63/73/+1/T/536/64 25 W VEC1 24 W RMY 29
8/15 70/64/67/-5/0.70/000/00 28 NE VEC1 27 NE RMY 28
8/16 68/64/66/-6/T/000/00 18 ESE VEC1 19 ENE RMY 18
8/17 70/62/66/-6/T/…/.. 15 E VEC1 14 E RMY 14
8/18 79/61/70/-1/1.48/…/.. 32 W VEC1 34 W RMY 33 TSTM
8/19 72/57/65/-6/0.00/…/.. 29 W VEC1 30 W RMY 30
8/20 The low since midnight is 59F, the daily normal low is 62F
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR AUGUST 20
HIGH 94F IN 2022
LOW 48F IN 1896, 1905, 1949
PRECIP 2.71 INCHES IN 1970
PEAK GUST 47 MPH W IN 1983, 47 SSW IN 2010
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
TODAY’S REPORT PREPARED BY: Matt Douglas
