Thursday, August 17, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, AUGUST 17, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0453E
SUNSET: 1843E
BELOW AVERAGE TEMPERATURES AND OVERCAST SKIES CONTINUE ON
THE GREAT BLUE HILL…
This morning before the first observation we had some fog that
burned off with the rising sunshine. Still, the sky was mostly
cloudy and as the day progressed we had increasing cloudiness
and overcast skies for the remainder of the afternoon.
Due to the continued cloud cover and the onshore flow we are
still experiencing below average temperatures for another day.
The dew points have been holding steady in the low 60’s, which
would normally not feel so comfortable if it weren’t for the
lower temperatures.
The wind has been very light, generally coming from the ESE and
then from the ENE and E with an average of just under 5mph. Our
highest gust so far for the day is only about 14mph which occurred
shortly before 11:30am.
Due to the lower clouds this morning, we had about 30 miles of
visibility and we improved slightly to 40-50 miles later during
the day.
The maximum temperature so far today has been 70F, which is
10 degrees below the normal high for today of 80F. The minimum
temperature since midnight is 62F, which is 1 degree below
the normal low of 63F.
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Today’s Observations:
7 A.M.
Weather: Broken stratocumulus
Temperature: 66F; Dew Point: 64F; Relative Humidity: 91%
Wind: E @ 7 kts, wind light
Sea-level pressure: 1018.2 mb; 30.07 in. Hg: rising, then more
slowly
Visibility: 30 miles
6-hr Max temp: 66F
6-hr Min temp: 62F
24-hr Precip: Trace
BHO SA 1155 E6 BKN 30 182/66/64/1004/007/ WND LGT/ 8/500 51006
70000 10066 20062
10 A.M.
Weather: Overcast stratocumulus, few stratus fractus NNE-E
Temperature: 68F; Dew Point: 63F; Relative Humidity: 84%
Wind: ENE @ 5 kts, wind light
Sea-level pressure: 1018.5 mb; 30.08 in. Hg: steady, then falling
Visibility: 50 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E15 OVC 50 185/68/63/0705/008/ FEW STFRA NNE-E WND LGT/
8/5// 58003
1 P.M.
Weather: Overcast stratus, few lower stratus fractus N-NE
Temperature: 68F; Dew Point: 65F; Relative Humidity: 89%
Wind: E @ 4 kts, wind light
Sea-level pressure: 1019.5 mb; 30.11 in. Hg: falling, then steady
Visibility: 40 miles
6-hr Max temp: 70F
6-hr Min temp: 66F
6-hr Precip: 0.00 inches
BHO SA 1755 E9 OVC 40 195/68/65/1004/011/ FEW LWR STFRA N-NE
WND LGT/ 8/6// 56010 10070 20066
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SUMMARY FOR WEDNESDAY, AUGUST 16, 2023
TEMPERATURE (DEGREES F)
MAX…….68 NORMAL…..80
MIN…….64 NORMAL…..63
MEAN……66 NORMAL…..72
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-6
TOTAL DEPARTURE FOR THE MONTH…………………-23 [-1.2 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……..-4
TOTAL HEATING UNITS FOR THE SEASON……………0 DEPARTURE…….-11
TOTAL HEATING UNITS LAST SEASON TO DATE……….0 DEPARTURE………0
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….1 DEPARTURE……..-6
TOTAL COOLING UNITS FOR THE MONTH……………96 DEPARTURE…….-24
TOTAL COOLING UNITS FOR THE SEASON………….518 DEPARTURE…….+11
TOTAL COOLING UNITS LAST SEASON TO DATE……..696 DEPARTURE……-178
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)……….E18 ESE @ 07:36 A.M.
VECTOR #1 (1-Sec)……….19 ESE @ 07:36 A.M.
VECTOR #2 (1-Sec)……….18 ESE @ 07:36 A.M.
DAVIS #1……………….17 ESE @ 07:43 A.M.
DAVIS #2 ………………17 ESE @ 07:33 A.M.
RMY #1 (Instantaneous)…..18 ESE @ 07:36 A.M.
RMY #2 (Instantaneous)…..19 ESE @ 07:33 A.M.
MERLIN…………………16 SE
RICHARDS (C5C) (Inst)……18 @ 07:45 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………13 ESE @ 07:40 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..13 @ 08:16 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..13 @ 07:45 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………13 ESE @ 07:13 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………13 ESE @ 07:34 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..13 ESE @ 07:37 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..13 ESE @ 07:34 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14 @ 07:46 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..5.9 ESE [141 total miles]
VECTOR #1………………6.0
VECTOR #2………………6.4
DAVIS #1……………….6.2 E
DAVIS #2……………….6.1 ESE
RMY #1…………………6.2 ESE
RMY #2…………………6.3 ESE
RICHARDS (C5C)………….6.9
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..1.47 DEPARTURE…..-0.62
TOTAL PRECIPITATION FOR THE YEAR…………..36.24 DEPARTURE…..+3.45
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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 The low since midnight is 62F, the daily normal low is 63F
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR AUGUST 17
HIGH 97F IN 1944
LOW 48F IN 1902
PRECIP 2.17 INCHES IN 1998
PEAK GUST 50e MPH SSW IN 1952, 50 MPH WNW IN 1962
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
TODAY’S REPORT PREPARED BY: Amanda Joly
