Friday, May 17, 2024

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

FRIDAY, MAY 17, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0420E
SUNSET:  1902E

MORNING CLOUDS CLEAR OUT FOR A WARM START TO THE WEEKEND….

Today has been an overall decent spring day! This morning started
off with some clouds and by mid morning we had a clearing of the
sky that welcomed bright, warm sunshine.

Temperatures have rebounded quite nicely since yesterday. During
the early morning we were in the mid 50’s and by 1pm we were one
degree shy of the daily normal high. Dew points have been in the
low 50’s but in the comfortable 50’s, as the relative humidity has
been below 70% for most of the day.

The wind shifted late last night from the NNE and we were back to
ENE flow by morning. While not as gusty as yesterday, the wind has
still been rather productive, with an average of about 12 mph. The
peak gust so far for the day occurred just before 1pm at about
26 mph.

Although we have had abundant sunshine and lower humidity, the
visibility remained around 40 miles today, mostly due to the pollen
causing hazy conditions.

The maximum temperature so far today is 66F degrees, which is 1
degree below the normal high of 67F. The minimum temperature since
midnight is 51F degrees, which is 2 degrees above the normal low of
49F.

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Today’s Observations:

7 A.M.
Weather: Broken stratocumulus, broken altocumulus
Temperature: 54F; Dew Point: 52F; Relative Humidity: 92%
Wind: NNE @ 8 kts
Sea-level pressure: 1017.3 mb; 30.04 in. Hg: rising unsteadily
Visibility: 60 miles, thin smoke layer NE-N
6-hr Max temp: 54F
6-hr Min temp: 50F
24-hr Precip:  0.36 inches
BHO SA 1155 E40 BKN 60 BKN 50 173/54/52/0208/004/ THN K LYR NE-N/
8/55/ 52031 70036 10054 20050

10 A.M.
Weather: Scattered cumulus, scattered altocumulus, scattered
cirrocumulus
Temperature: 63F; Dew Point: 50F; Relative Humidity: 62%
Wind: NE @ 9 kts
Sea-level pressure: 1016.2 mb; 30.01 in. Hg: falling steadily
Visibility: 40 miles, hazy
3-hr Precip:  0.00 inches
BHO SA 1455 25 SCT 120 SCT E200 SCT E250 BKN 40 162/63/50/0409/001/
HAZY/ 8/259 57011

1 P.M.
Weather: Scattered cumulus, scattered altocumulus, thinly scattered
cirrus
Temperature: 64F; Dew Point: 50F; Relative Humidity: 61%
Wind: ENE @ 12 kts
Sea-level pressure: 1016.1 mb; 30.01 in. Hg: rising, then falling
Visibility: 40 miles, hazy
6-hr Max temp: 66F
6-hr Min temp: 54F
6-hr Precip:  0.00 inches
BHO SA 1755 30 SCT 110 SCT 250 -SCT 40 161/64/50/0612/001/ HAZY/
8/251 58001 10066 20054

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SUMMARY FOR THURSDAY, MAY 16, 2024

TEMPERATURE (DEGREES F)
MAX…….56   NORMAL…..67
MIN…….52   NORMAL…..48
MEAN……54   NORMAL…..58

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….-4
TOTAL DEPARTURE FOR THE MONTH……………………-15 [-1.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………11  DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE MONTH…………..168  DEPARTURE……..+8
TOTAL HEATING UNITS FOR THE SEASON…………5325  DEPARTURE……-722
TOTAL HEATING UNITS LAST SEASON TO DATE…….5087  DEPARTURE……+223

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……..-6
TOTAL COOLING UNITS FOR THE SEASON……………2  DEPARTURE……..-9
TOTAL COOLING UNITS LAST SEASON TO DATE………25  DEPARTURE…….-23

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)……….E32 ENE  @  02:04 A.M.
VECTOR #1 (1-Sec)……….32 ENE  @  02:04 A.M.
VECTOR #2 (1-Sec)……….32 ENE  @  03:56 A.M.
DAVIS #1……………….32 ENE  @  02:04 A.M.
DAVIS #2 ………………30 ENE  @  02:04 A.M.
RMY #1 (Instantaneous)…..31 ENE  @  06:04 A.M.
RMY #2 (Instantaneous)…..33 ENE  @  06:04 A.M.
MERLIN…………………27
RICHARDS (C5C) (Inst)……29      @  02:04 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………20 ENE  @  06:05 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20      @  06:05 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22      @  02:50 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 E    @  02:05 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 E    @  02:05 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 ENE  @  02:05 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 NE   @  02:50 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………21      @  02:05 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……14.9 ENE [357 total miles] VECTOR #1…………….13.7
VECTOR #2…………….15.2
DAVIS #1……………..15.1 ENE
DAVIS #2……………..15.2 ENE
RMY #1……………….13.8 ENE
RMY #2……………….14.8 ENE
RICHARDS (C5C)………..14.2

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.36 DEPARTURE…..+0.25
TOTAL PRECIPITATION FOR THE MONTH…………..2.74 DEPARTURE…..+0.83
TOTAL PRECIPITATION FOR THE YEAR (2024)…….27.70 DEPARTURE…..+7.59

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

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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/…/..            33 SSW VEC1 33 SSW RMY 32
5/15  73/53/63/+6/0.46/0.0/…/..         24 ENE VEC1 24 E   RMY 24
5/16  56/52/54/-4/0.36/0.0/…/..         32 ENE VEC1 32 ENE RMY 31

5/17 The low since midnight is 50F, the daily normal low is 49F.

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MAY DAILY RECORDS TO DATE

NONE…

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

RECORDS FOR MAY 17
HIGH 90F IN 2017
LOW 34F IN 1956, 1957
PRECIP 2.07 INS IN 1916
PEAK GUST 52 MPH SW IN 1967, W IN 1974

RECORDS FOR MAY 18
HIGH 96F IN 2017(RECORD FOR MAY)
LOW 35F IN 2002
PRECIP 1.93 INS IN 2007
SNOW TRACE IN 2002 (Ice pellets)
PEAK GUST 64 MPH SSW IN 2000

TODAY’S REPORT PREPARED BY: Amanda Joly