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Saturday, May 11, 2024

May 11, 2024

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, MAY 11, 2024 ALL TIMES ARE…

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

SATURDAY, MAY 11, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0426E
SUNSET:  1855E

A LOT OF CLOUDS AROUND WITH A COOL WIND OFF THE OCEAN TODAY….

Dry weather continues, but we certainly haven’t had a lack of
cloud cover the past few days. Today continues that trend with
a lot of cloud cover, but no rainfall.

Temperatures are on the cool side with readings so far only
reaching the low to mid 50s. This is a good 12-14 degrees below
the normal high for this time of year. Dew points have been
holding in the low 40s, indicating how dry the air mass is.

Wind has been a bit busy today with a flow off the ocean. The
average speed so far for the day is around 9mph. The peak gust
so far for the day is 26mph, which occurred just before 11am.

Visibility has been relatively decent today with 40-65 miles
being observed throughout the day.

The maximum temperature so far today is 54F degrees, which is
12 degrees below the normal high of 66F. The minimum temperature
since midnight is 39F degrees, which is 8 degrees below the
normal low of 47F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, broken altocumulus/castellanus
Temperature: 46F; Dew Point: 40F; Relative Humidity: 79%
Wind: NE @ 9G17 kts
Sea-level pressure: 1012.3 mb; 29.89 in. Hg: rising, then more slowly
Visibility: 40 miles, hazy
6-hr Max temp: 46F
6-hr Min temp: 39F
24-hr Precip:  0.00 inches
BHO SA 1155 E25 BKN 120 BKN 40 123/46/40/0509G17/989/ HAZY/ 8/580 51008
10046 20039

10 A.M.
Weather: Broken cumulus, broken stratocumulus, few lower cumulus
fractus all quadrants
Temperature: 53F; Dew Point: 41F; Relative Humidity: 64%
Wind: ENE @ 12G21 kts
Sea-level pressure: 1012.6 mb; 29.90 in. Hg: steady, then rising
Visibility: 65 miles
3-hr Precip:  0.00 inches
BHO SA 1455 E30 BKN 45 BKN 65 126/53/41/0712G21/990/ FEW LWR CUFRA
ALQDS/ 8/800 53003

1 P.M.
Weather: Scattered cumulus, broken stratocumulus
Temperature: 51F; Dew Point: 40F; Relative Humidity: 63%
Wind: ENE @ 9G16 kts
Sea-level pressure: 1011.9 mb; 29.88 in. Hg: falling, then more slowly
Visibility: 60 miles
6-hr Max temp: 54F
6-hr Min temp: 46F
6-hr Precip:  0.00 inches
BHO SA 1755 20 SCT E55 BKN 60 119/51/40/0709G16/988/ 8/800 56007
10054 20046

————————————————————–

SUMMARY FOR FRIDAY, MAY 10, 2024

TEMPERATURE (DEGREES F)
MAX…….56   NORMAL…..65
MIN…….42   NORMAL…..47
MEAN……49   NORMAL…..56

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….-7
TOTAL DEPARTURE FOR THE MONTH…………………….-7 [-0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………16  DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE MONTH…………..112  DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE SEASON…………5269  DEPARTURE……-726
TOTAL HEATING UNITS LAST SEASON TO DATE…….5073  DEPARTURE……+196

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)……….E28 ENE  @  01:21 P.M.
VECTOR #1 (1-Sec)……….27 ENE  @  01:21 P.M.
VECTOR #2 (1-Sec)……….27 ENE  @  01:40 P.M.
DAVIS #1……………….27 ENE  @  01:51 P.M.
DAVIS #2 ………………25 ENE  @  01:40 P.M.
RMY #1 (Instantaneous)…..27 ENE  @  01:21 P.M.
RMY #2 (Instantaneous)…..26 ENE  @  01:56 P.M.
MERLIN…………………25 ENE
RICHARDS (C5C) (Inst)……25      @  01:54 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 ENE  @  01:57 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16      @  01:36 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20      @  01:56 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 E    @  01:56 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 E    @  01:56 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 E    @  01:55 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 ENE  @  01:56 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18      @  01:55 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….9.1 ENE [219 total miles] VECTOR #1……………..8.6
VECTOR #2……………..9.5
DAVIS #1………………9.6 E
DAVIS #2………………9.5 E
RMY #1………………..8.9 ENE
RMY #2………………..9.3 ENE
RICHARDS (C5C)…………9.5

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…..+0.04
TOTAL PRECIPITATION FOR THE YEAR (2024)…….26.22 DEPARTURE…..+6.22

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/…/..         33 NW  VEC1 33 NW  RMY 34
5/10  56/42/49/-7/0.00/0.0/…/..         28 ENE VEC1 27 ENE RMY 27

5/11 The low since midnight is 39F, 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 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

RECORDS FOR MAY 12
HIGH 88F IN 2001
LOW 29F IN 1907
PRECIP 1.49 INCHES IN 1968
SNOW TRACE IN 2019
PEAK GUST 76 MPH S IN 1974

TODAY’S REPORT PREPARED BY: Matt Douglas

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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
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