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Saturday, September 7, 2024

September 7, 2024

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, SEPTEMBER 7, 2024 ALL TIMES ARE…

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BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

SATURDAY, SEPTEMBER 7, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0516E
SUNSET:  1807E

SOME FILTERED SUNSHINE THIS MORNING BEFORE CLOUDS FILL IN….

A stratus overcast was over the summit as the sun rose, which
quickly dissipated thereafter. Through the remainder of the morning,
cirrus occupied a good portion of the sky, allowing for some filtered
sunshine. Thereafter, the high level clouds thickened, along with
the development of mid level clouds, thus limiting sunshine into
the early afternoon.

Temperatures are seasonable, with the low this morning being in the upper
50s. Since then, we have climbed into the mid 70s. The dew point has fallen
from the low 60s back into the mid 50s.

Winds have been very light, especially since late morning. The
average speed thus far is only 6mph. The flow was out of the north for much
of the morning, but around 11am it shifted and is now out of the south.
The peak gust took place around 4am this morning, with a value of only 15mph.

Visibility was poor this morning due to fog on the summit, but as the
low clouds have dissipated, the views have improved up to 40 miles.

The maximum temperature so far today is 75F, which is 1 degree below
the normal high of 76F. The minimum temperature since midnight is 58F,
which is 1 degree below the normal low of 59F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 60F; Dew Point: 59F; Relative Humidity: 97%
Wind: NNW @ 5 kts, wind light
Sea-level pressure: 1013.6 mb; 29.93 in. Hg: falling steadily
Visibility: 20 miles, thin fog all quadrants
6-hr Max temp: 62F
6-hr Min temp: 58F
24-hr Precip:  0.00 inches
BHO SA 1155 E4 OVC 20 136/60/59/3405/993/ THN F ALQDS WND LGT/ 8/6//
57003 10062 20058

10 A.M.
Weather: Broken cirrus, few stratocumulus all quadrants
Temperature: 70F; Dew Point: 60F; Relative Humidity: 71%
Wind: NNE @ 4 kts, wind light
Sea-level pressure: 1012.8 mb; 29.91 in. Hg: falling unsteadily
Visibility: 40 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E250 BKN 40 128/70/60/0204/991/ FEW SC ALQDS HAZY WND LGT/
8/501 57008

1 P.M.
Weather: Scattered altostratus/altocumulus, broken cirrostratus,
broken cirrus, few stratocumulus all quadrants
Temperature: 73F; Dew Point: 55F; Relative Humidity: 52%
Wind: SSE @ 4 kts, wind light
Sea-level pressure: 1010.7 mb; 29.85 in. Hg: falling unsteadily
Visibility: 40 miles, hazy
6-hr Max temp: 75F
6-hr Min temp: 60F
6-hr Precip: 0.00 inches
BHO SA 1755 160 SCT E220 BKN 250 BKN 40 107/73/55/1604/985/ FEW SC ALQDS
HAZY WND LGT/ 8/576 57021 10075 20060

————————————————————–

SUMMARY FOR FRIDAY, SEPTEMBER 6, 2024

TEMPERATURE (DEGREES F)
MAX…….73  NORMAL…..76
MIN…….59  NORMAL…..59
MEAN……66  NORMAL…..68

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..-2
TOTAL DEPARTURE FOR THE MONTH……………………..-3 [-0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………….3  DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE SEASON…………..14  DEPARTURE…….-11
TOTAL HEATING UNITS LAST SEASON TO DATE……….3  DEPARTURE…….+11

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….1  DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE MONTH……………20  DEPARTURE……..-6
TOTAL COOLING UNITS FOR THE SEASON………….714  DEPARTURE…….+92
TOTAL COOLING UNITS LAST SEASON TO DATE……..620  DEPARTURE…….+94

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated

F420C (Official)……….E22 E    @   12:35 P.M.
VECTOR #1 (1-Sec)……….21 ENE  @   12:25 P.M.
VECTOR #2 (1-Sec)……….22 ENE  @   11:10 A.M.
DAVIS #1……………….22 ENE  @   11:08 A.M.
DAVIS #2 ………………21 E    @   11:11 A.M.
RMY #1 (Instantaneous)…..23 ENE  @   11:08 A.M.
RMY #2 (Instantaneous)…..22 NE   @   12:25 P.M.
MERLIN…………………21 ENE
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 ENE  @   11:12 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14      @   11:12 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16      @   11:11 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 E    @   11:12 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 E    @   11:11 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 ENE  @   11:12 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 ENE  @   11:11 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..9.1 ENE [218 total miles] VECTOR #1………………8.9
VECTOR #2………………9.7
DAVIS #1……………….9.6 ENE
DAVIS #2……………….9.6 ENE
RMY #1…………………9.0 ENE
RMY #2…………………9.4 NE
RICHARDS (C5C)…………OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH………….TRACE DEPARTURE…..-0.71
TOTAL PRECIPITATION FOR THE YEAR (2024)…….41.21 DEPARTURE…..+5.89

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/1   82/67/75/+6/T/244/31                28 SSW VEC1 27 SW  RMY 28
9/2   79/56/68/-1/0.00/644/82             31 NNW VEC1 31 NNW RMY 32
9/3   74/49/62/-6/0.00/766/98             23 NW  VEC1 23 NNW RMY 23
9/4   80/56/68/0/0.00/732/94              18 ESE VEC1 19 SE  RMY 18
9/5   77/58/68/0/0.00/…/..              20 ESE VEC1 19 ESE RMY 19
9/6   73/59/66/-2/0.00/…/..             22 E   VEC1 21 ENE RMY 23

9/7  The low since midnight is 58F, the daily normal low is 59F.

————————————————————–

SEPTEMBER DAILY RECORDS TO DATE

NONE.

————————————————————–

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR SEPTEMBER 7
HIGH 92F IN 2007, 2015, 2023
LOW 40F IN 1888
PRECIP 2.91 INCHES IN 1891
PEAK GUST 58e MPH W IN 1941

RECORDS FOR SEPTEMBER 8
HIGH 97F IN 2015
LOW 42F IN 1978
PRECIP 1.51 INCHES IN 2011
PEAK GUST 45 MPH S IN 2012

TODAY’S REPORT PREPARED BY: Joshua Polen

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Blue Hill Observatory & Science Center · Legal

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Please read the full Policy before accessing Observatory data · Effective January 1, 2025

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Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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