Saturday, May 18, 2024

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

SATURDAY, MAY 18, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0419E
SUNSET:  1903E

OVERCAST WITH A LIGHT NORTHEASTERLY WIND AND LIMITED VISIBILITY….

We observed cooler conditions today with temperatures hanging in
the low to mid 50’s. The prevailing wind direction is northeasterly
with an average speed around 10 mph with a max gust so far today of
23 mph.

Visibility was limited due to fog, only reaching 30 miles by the
1 PM observation. Rain in surrounding areas missed us overnight,
leaving nothing in the gauge throughout the day.

The maximum temperature so far today is 57F degrees, which is 10
degrees 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: Overcast stratus
Temperature: 52F; Dew Point: 50F; Relative Humidity: 91%
Wind: NE @ 11G20 kts
Sea-level pressure: 1016.9 mb; 30.03 in. Hg: rising unsteadily
Visibility: 30 miles, thin fog
6-hr Max temp: 52F
6-hr Min temp: 51F
24-hr Precip:  0.00 inches
BHO SA 1155 20 OVC 30 169/52/50/0511G20/003/ THN F ALQDS/ 8/6//
52010 10052 20051

10 A.M.
Weather: Overcast stratus
Temperature: 54F; Dew Point: 50F; Relative Humidity: 87%
Wind: NE @ 9G18 kts
Sea-level pressure: 1017.3 mb; 30.04 in. Hg: falling then rising
Visibility: 20 miles, thin fog
3-hr Precip:  0.00 inches
BHO SA 1455 20 OVC 20 173/54/50/0509G18/004/ THN F ALQDS/ 8/6// 50004

1 P.M.
Weather: Overcast stratocumulus
Temperature: 55F; Dew Point: 51F; Relative Humidity: 86%
Wind: NE @ 10G14 kts
Sea-level pressure: 1017.2 mb; 30.04 in. Hg: rising, then falling
Visibility: 30 miles, thin fog
6-hr Max temp: 57F
6-hr Min temp: 52F
6-hr Precip:  0.00 inches
BHO SA 1755 20 OVC 30 172/55/51/0510G14/004/ THN F ALQDS/ 8/5//
55001 10057 20052

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SUMMARY FOR FRIDAY, MAY 17, 2024

TEMPERATURE (DEGREES F)
MAX…….66   NORMAL…..67
MIN…….50   NORMAL…..49
MEAN……58   NORMAL…..58

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….0
TOTAL DEPARTURE FOR THE MONTH……………………-15 [-0.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….7  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………..175  DEPARTURE……..+7
TOTAL HEATING UNITS FOR THE SEASON…………5332  DEPARTURE……-723
TOTAL HEATING UNITS LAST SEASON TO DATE…….5102  DEPARTURE……+230

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……..-7
TOTAL COOLING UNITS FOR THE SEASON……………2  DEPARTURE…….-10
TOTAL COOLING UNITS LAST SEASON TO DATE………25  DEPARTURE…….-24

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)……….E29 ENE  @  12:24 P.M.
VECTOR #1 (1-Sec)……….27 ENE  @  12:51 P.M.
VECTOR #2 (1-Sec)……….27 ENE  @  02:02 P.M.
DAVIS #1……………….26 ENE  @  12:24 P.M.
DAVIS #2 ………………26 ENE  @  12:51 P.M.
RMY #1 (Instantaneous)…..27 ENE  @  12:09 P.M.
RMY #2 (Instantaneous)…..27 ENE  @  12:50 P.M.
MERLIN…………………27
RICHARDS (C5C) (Inst)……25      @  02:04 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 ENE  @  02:02 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17 ENE  @  12:46 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20      @  02:02 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 ENE  @  02:32 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 E    @  02:42 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 ENE  @  02:03 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 ENE  @  02:02 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18      @  02:03 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……11.6 ENE [279 total miles] VECTOR #1…………….11.4
VECTOR #2…………….12.2
DAVIS #1……………..12.0 EE
DAVIS #2……………..12.1 ENE
RMY #1……………….11.3 NE
RMY #2……………….11.9 NE
RICHARDS (C5C)………..11.5

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH…………..2.74 DEPARTURE…..+0.71
TOTAL PRECIPITATION FOR THE YEAR (2024)…….27.70 DEPARTURE…..+6.89

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/-4/1.02/0.0/…/..         32 ENE VEC1 32 ENE RMY 31
5/17  66/50/58/0/…/0.0/…/..           29 ENE VEC1 28 ENE RMY 27

5/18 The low since midnight is 51F, 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 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

RECORDS FOR MAY 19
HIGH 91F IN 1962
LOW 34F IN 2002
PRECIP 1.54 INCHES IN 1900
PEAK GUST 58 MPH NW IN 1964

TODAY’S REPORT PREPARED BY: Benjamin Turner