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Friday, May 10, 2024

May 10, 2024

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

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

FRIDAY, MAY 10, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0428E
SUNSET:  1854E

OVERCAST CONDITIONS CLEAR MID MORNING AND BRINGS PARTLY
CLOUDY SKIES TO BLUE HILL….

We remained dry on Blue Hill overnight and during the morning
as some rain moved through the area. Although we were spared any
precipitation, the overcast skies kept the temperatures cooler
than normal, and especially cooler than the previous days. By
mid morning, the sun made its long awaited appearance and things
started to finally warm. A brief clearing during the late morning
was nice before increasing clouds came through from the west.

The temperature has remained slightly below normal today. This
is partly due to the wind change late yesterday afternoon which
brought in cooler air. Dew points hovered in the upper 30’s to
low 40’s.

Wind has been quite low today with a recent bit of activity in
the last couple of hours. Overall though, it’s been a low-steady
kind of day with an average of just over 8 mph. The peak gust
so far was around 25 mph and occurred just before noon.

Visibility has been relatively steady with about 50-60 miles
throughout the day.

The maximum temperature so far today is 56F degrees, which is
9 degrees below the normal high of 65F. The minimum temperature
since midnight is 45F degrees, which is 2 degrees below the
normal low of 47F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, overcast altostratus, few lower
stratus fractus all quadrants
Temperature: 46F; Dew Point: 43F; Relative Humidity: 88%
Wind: ENE @ 5 kts, wind light
Sea-level pressure: 1011.0 mb; 29.85 in. Hg: rising, then falling
Visibility: 50 miles
6-hr Max temp: 46F
6-hr Min temp: 45F
24-hr Precip:  0.00 inches
BHO SA 1155 E20 BKN 90 OVC 50 110/46/43/0705/985/ FEW LWR STFRA
ALQDS WND LGT/ 8/52/ 50010 10046 20045

10 A.M.
Weather: Scattered stratocumulus, scattered altostratus
Temperature: 53F; Dew Point: 38F; Relative Humidity: 57%
Wind: E @ 10 kts
Sea-level pressure: 1010.9 mb; 29.85 in. Hg: falling, then more slowly
Visibility: 60 miles
3-hr Precip:  0.00 inches
BHO SA 1455 20 SCT 90 SCT 60 109/53/38/0810/985/ 8/550 56001

1 P.M.
Weather: Scattered stratocumulus, scattered altostratus, thinly broken
cirrus
Temperature: 53F; Dew Point: 35F; Relative Humidity: 49%
Wind: E @ 11 kts
Sea-level pressure: 1010.9 mb; 29.85 in. Hg: steady
Visibility: 60 miles
6-hr Max temp: 56F
6-hr Min temp: 46F
6-hr Precip:  0.00 inches
BHO SA 1755 20 SCT 120 SCT 250 -BKN 60 109/53/35/0911/985/ 8/521
54000 10056 20046

————————————————————–

SUMMARY FOR THURSDAY, MAY 9, 2024

TEMPERATURE (DEGREES F)
MAX…….63   NORMAL…..65
MIN…….45   NORMAL…..46
MEAN……54   NORMAL…..56

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….-2
TOTAL DEPARTURE FOR THE MONTH……………………..0 [-0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………11  DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH……………96  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE SEASON…………5253  DEPARTURE……-732
TOTAL HEATING UNITS LAST SEASON TO DATE…….5070  DEPARTURE……+183

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………….2  DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE SEASON……………2  DEPARTURE……..-5
TOTAL COOLING UNITS LAST SEASON TO DATE……….9  DEPARTURE……..-7

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)……….E33 NW   @  06:50 A.M.
VECTOR #1 (1-Sec)……….33 NW   @  06:50 A.M.
VECTOR #2 (1-Sec)……….33 NW   @  07:22 A.M.
DAVIS #1……………….30 NW   @  06:52 A.M.
DAVIS #2 ………………28 NNW  @  07:16 A.M.
RMY #1 (Instantaneous)…..34 NW   @  06:50 A.M.
RMY #2 (Instantaneous)…..33 NW   @  07:22 A.M.
MERLIN…………………27 NW
RICHARDS (C5C) (Inst)……31      @  06:52 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 NW   @  07:49 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19      @  07:49 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21      @  07:50 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 NW   @  07:49 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 NW   @  07:24 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..20 NW   @  07:49 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..21 NW   @  07:50 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………20      @  07:49 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……10.2 E   [244 total miles] VECTOR #1…………….10.0
VECTOR #2…………….10.4
DAVIS #1……………..10.5 NNE
DAVIS #2……………..10.4 NNE
RMY #1………………..9.9 NNE
RMY #2……………….10.3 N
RICHARDS (C5C)………..10.1

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..1.26 DEPARTURE…..+0.15
TOTAL PRECIPITATION FOR THE YEAR (2024)…….26.22 DEPARTURE…..+6.33

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
5/9   63/45/54/-2/0.00/0.0/…/..         33 NW  VEC1 33 NW  RMY 34

5/10 The low since midnight is 45F, the daily normal low is 47F.

————————————————————–

MAY DAILY RECORDS TO DATE

NONE…

————————————————————–

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

RECORDS FOR MAY 10
HIGH 93F IN 1896
LOW 29F  IN 1900
PRECIP 1.85 INS IN 1998
SNOW 2.8 INS 1977 (7.8 INS TOTAL 5/9-5/10 1977)
PEAK GUST 64 MPH S IN 1990

RECORDS FOR MAY 11
HIGH 90F IN 1993
LOW 28F IN 1900
PRECIP 1.28 INS IN 1957
SNOW 1.0 INS IN 1907 (LATEST MEASURABLE SNOW ON RECORD)
PEAK GUST 75e MPH NW IN 1945

TODAY’S REPORT PREPARED BY: Amanda Joly

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

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

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
Part I — Data Use Policy
§ 01

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Effective January 1, 2025 · Blue Hill Observatory & Science Center · Milton, Massachusetts
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