Wednesday, May 29, 2024

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

WEDNESDAY, MAY 29, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0411E
SUNSET: 1913E

A DELIGHTFUL LATE SPRING DAY WITH PLEASANT TEMPERATURES AND
COMFORTABLE HUMIDITY LEVELS….

Clear skies this morning have filled with cumulus clouds as
the day time heating did it’s work on the atmosphere. There
is limited vertical development with the cumulus, so they are
tending to spread out in the mid levels as altocumulus. So
this afternoon is characterized as having more clouds then
sun, at least for the time being. Nonetheless, it’s still
quite a nice day out there.

Temperatures have warmed into the low to mid 70s early this
afternoon, which is only a touch above normal levels. The dew
point has been in the low to mid 50s all day, so the air has
a very comfortable feel, especially compared to the past few
days.

Winds have generally been on the light side out of the west-
northwest to northwest. It has shown some signs of trying to
pick up a bit early this afternoon, likely due to some mixing
of the atmosphere. Either way, the average speed thus far is
only around 8mph. The peak gust for the day so far was way
back between midnight and 1am with a value of 21mph.

Visibility has been pretty decent today despite the pollen
induced haziness. The view has been around 60 miles all day.

The maximum temperature so far today is 75F degrees, which is
5 degrees above the normal high of 70F. The minimum temperature
since midnight is 57F degrees, which is 5 degrees above the
normal low of 52F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Clear, few cumulus distant W-N, few altocumulus distant NNW-N,
few cirrus distant WNW-NE
Temperature: 64F; Dew Point: 55F; Relative Humidity: 71%
Wind: NW @ 4 kts, wind light
Sea-level pressure: 1011.4 mb; 29.87 in. Hg: rising, then more slowly
Visibility: 60 miles
6-hr Max temp: 64F
6-hr Min temp: 57F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 60 114/64/55/3204/987/ FEW CU DSNT W-N FEW AC DSNT
NNW-N FEW CI DSNT WNW-NE WND LGT/ 8/251 51018 10064 20057

10 A.M.
Weather: Broken cumulus, broken altocumulus
Temperature: 71F; Dew Point: 52F; Relative Humidity: 52%
Wind: WNW @ 3 kts, wind light
Sea-level pressure: 1012.8 mb; 29.91 in. Hg: rising steadily
Visibility: 60 miles
3-hr Precip: 0.00 inches
BHO SA 1455 E40 BKN 65 BKN 60 128/71/52/3003/991/ WND LGT/ 8/250 52014

1 P.M.
Weather: Broken cumulus, broken altocumulus
Temperature: 72F; Dew Point: 55F; Relative Humidity: 55%
Wind: WNW @ 7 kts
Sea-level pressure: 1012.5 mb; 29.90in. Hg: rising, then falling
Visibility: 60 miles
6-hr Max temp: 75F
6-hr Min temp: 64F
6-hr Precip: 0.00 inches
BHO SA 1755 E45 BKN 75 BKN 60 125/72/55/2907/990/ 8/260 58003 10075
20064

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SUMMARY FOR TUESDAY, MAY 28, 2024

TEMPERATURE (DEGREES F)
MAX…….80 NORMAL…..70
MIN…….62 NORMAL…..52
MEAN……71 NORMAL…..61

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+10
TOTAL DEPARTURE FOR THE MONTH…………………….+48 [+1.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-6
TOTAL HEATING UNITS FOR THE MONTH…………..208 DEPARTURE…….-34
TOTAL HEATING UNITS FOR THE SEASON…………5365 DEPARTURE……-764
TOTAL HEATING UNITS LAST SEASON TO DATE…….5180 DEPARTURE……+185

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….6 DEPARTURE……..+5
TOTAL COOLING UNITS FOR THE MONTH……………36 DEPARTURE…….+16
TOTAL COOLING UNITS FOR THE SEASON…………..36 DEPARTURE…….+13
TOTAL COOLING UNITS LAST SEASON TO DATE………31 DEPARTURE……..+5

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)……….E36 SSE @ 12:41 A.M.
VECTOR #1 (1-Sec)……….37 SSE @ 12:41 A.M.
VECTOR #2 (1-Sec)……….34 SSE @ 12:41 A.M.
DAVIS #1……………….32 S @ 01:08 A.M.
DAVIS #2 ………………42 S @ 12:24 A.M.
RMY #1 (Instantaneous)…..36 SSE @ 12:41 A.M.
RMY #2 (Instantaneous)…..39 SSE @ 12:41 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…….M

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………23 S @ 12:26 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..23 @ 12:42 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23 @ 12:41 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 SSE @ 12:41 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 S @ 12:25 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..23 S @ 12:42 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..24 SSE @ 12:41 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……….M

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……12.6 W [302 total miles] VECTOR #1…………….12.6
VECTOR #2…………….12.9
DAVIS #1……………..12.6 WSW
DAVIS #2……………..13.1 WSW
RMY #1……………….12.2 WSW
RMY #2……………….12.8 WSW
RICHARDS (C5C)…………..M

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..4.45 DEPARTURE…..+1.04
TOTAL PRECIPITATION FOR THE YEAR (2024)…….29.41 DEPARTURE…..+7.22

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE SEASON (2023-2024)……26.8 DEPARTURE…..-42.9

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

5/1 53/42/48/-5/0.06/0.0/177/21 18 ESE VEC1 18 ESE RMY 18
5/2 69/44/57/+3/0.21/0.0/535/63 35 NE VEC1 36 NE RMY 35 TSTM
5/3 57/44/51/-3/0.02/0.0/408/48 24 NE VEC1 24 NE RMY 25
5/4 55/44/50/-4/0.00/0.0/589/69 22 ENE VEC1 21 NE RMY 21
5/5 51/42/47/-8/0.35/0.0/000/00 21 S VEC1 22 S RMY 21
5/6 75/46/61/+6/0.02/0.0/343/40 20 SW VEC1 18 SW RMY 20
5/7 78/55/67/+12/0.00/0.0/851/99 23 NW VEC1 24 NE RMY 23
5/8 62/49/56/+1/0.60/0.0/078/09 30 S VEC1 31 S RMY 31 TSTM
5/9 63/45/54/-2/0.00/0.0/588/68 33 NW VEC1 33 NW RMY 34
5/10 56/42/49/-7/0.00/0.0/572/66 28 ENE VEC1 27 ENE RMY 27
5/11 55/39/47/-9/0.00/0.0/617/71 26 ENE VEC1 26 NE RMY 27
5/12 60/41/51/-6/T/0.0/305/35 16 WSW VEC1 15 SW RMY 15
5/13 68/45/57/0/0.00/0.0/663/76 25 S VEC1 25 SE RMY 26
5/14 76/48/62/+5/T/0.0/718/82 33 SSW VEC1 33 SSW RMY 32
5/15 73/53/63/+6/0.46/0.0/079/09 24 ENE VEC1 24 E RMY 24
5/16 56/52/54/-4/1.02/0.0/141/16 32 ENE VEC1 32 ENE RMY 31
5/17 66/50/58/0/0.00/0.0/662/75 29 ENE VEC1 28 ENE RMY 27
5/18 58/50/54/-4/0.26/0.0/000/00 32 NE VEC1 33 NE RMY 34
5/19 53/48/51/-7/0.22/0.0/000/00 30 NE VEC1 30 NE RMY 30
5/20 65/48/57/-2/0.00/0.0/452/51 18 S VEC1 17 SSE RMY 18
5/21 84/50/67/+8/0.00/0.0/648/73 22 SSW VEC1 22 SSW RMY 22
5/22 88/56/72/+13/0.00/0.0/854/96 32 SSW VEC1 32 SSW RMY 33
5/23 75/61/68/+9/0.42/0.0/…/.. 31 SSW VEC1 30 SSW RMY 31 TSTM
5/24 82/59/71/+11/0.00/0.0/…/.. 38 W VEC1 38 W RMY 37
5/25 80/55/68/+8/0.00/0.0/…/.. 24 S VEC1 23 SW RMY 25
5/26 79/58/69/+9/0.30/0.0/…/.. 22 S VEC1 22 S RMY 22
5/27 75/61/68/+8/0.28/0.0/…/.. 36 S VEC1 37 S RMY 39
5/28 80/62/71/+10/0.23/0.0/…/.. 36 SSE VEC1 37 SSE RMY 36