Monday, May 15, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, MAY 15, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0423E
SUNSET: 1859E
A MIX OF SUN AND HIGH CLOUDS WITH AN INCREASING WARM BREEZE…
Sunshine has been the theme most of the day with only some high
thin cirrus clouds moving across the sky. There was a period
late this morning when the cloud cover was thick enough to
block the sun. Despite that, it’s been a rather nice day with
the temperature reaching the low 70s early this afternoon after
a chilly start this morning.
The wind has been picking up this afternoon, after being on the
light side this morning. Speeds have increased to 10-15mph with
gusts around 25-30mph. The average speed for the day so far is
around 10mph. Wind direction has been gradually backing from
the north-northwest to west.
Visibility has been 55-65 miles today with some haziness out
there thanks to the pollen in the air.
The high so far today was 72F, which is 5 degrees above our
normal max temperature of 67F. Our low since midnight was 45F,
which is 3 degrees below our normal low temperature of 48F.
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Today’s Observations:
7 A.M.
Weather: Clear, few cirrus all quadrants
Temperature: 53F; Dew Point: 35F; Relative Humidity: 50%
Wind: WNW @ 7 kts
Sea-level pressure: 1023.4 mb; 30.22 in. Hg: rising, then more slowly
Visibility: 65 miles
6-hr Max temp: 53F
6-hr Min temp: 45F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 65 234/53/35/2907/022/ FEW CI ALQDS/ 8/001
51007 10053 20045
10 A.M.
Weather: Overcast cirrostratus
Temperature: 63F; Dew Point: 30F; Relative Humidity: 28%
Wind: W @ 6 kts, wind light
Sea-level pressure: 1021.4 mb; 30.16 in. Hg: falling, then more rapidly
Visibility: 60 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E220 OVC 60 214/63/30/2706/016/ WND LGT/ 8/007 58020
1 P.M.
Weather: Thin broken cirrus
Temperature: 71F; Dew Point: 35F; Relative Humidity: 27%
Wind: W @ 10G20 kts
Sea-level pressure: 1017.6 mb; 30.05 in. Hg: falling, then more rapidly
Visibility: 55 miles, hazy
6-hr Max temp: 72F
6-hr Min temp: 53F
6-hr Precip: 0.00 ins.
BHO SA 1755 E250 -BKN 55 176/71/35/2610G20/005/ HAZY/ 8/001 58038
10072 20053
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SUMMARY FOR SUNDAY, MAY 14, 2023
TEMPERATURE (DEGREES F)
MAX…….66 NORMAL…..66
MIN…….47 NORMAL…..48
MEAN……57 NORMAL…..57
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….0
TOTAL DEPARTURE FOR THE MONTH………………..+39 [+2.6 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….8 DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………..100 DEPARTURE…….-43
TOTAL HEATING UNITS FOR THE SEASON…………5071 DEPARTURE……-959
TOTAL HEATING UNITS LAST SEASON TO DATE…….5528 DEPARTURE……-457
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH……………13 DEPARTURE……..+6
TOTAL COOLING UNITS FOR THE SEASON…………..22 DEPARTURE…….+12
TOTAL COOLING UNITS LAST SEASON TO DATE………13 DEPARTURE……..+9
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 NNW @ 04:05 P.M.
VECTOR #1 (1-Sec)……….29 NNW @ 04:05 P.M.
VECTOR #2 (1-Sec)……….32 NW @ 03:18 P.M.
DAVIS #1……………….27 NNW @ 04:05 P.M.
DAVIS #2 ………………29 WNW @ 03:18 P.M.
RMY #1 (Instantaneous)…..31 NNW @ 04:05 P.M.
RMY #2 (Instantaneous)…..32 NW @ 03:18 P.M.
MERLIN…………………26 NNW
RICHARDS (C5C) (Inst)……29 @ 04:05 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 NW @ 04:21 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19 @ 04:07 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21 @ 10:28 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 WNW @ 03:20 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 NW @ 10:28 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 NW @ 04:18 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 NW @ 10:28 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………19 @ 04:18 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………10.4 NNW [249 total miles]
VECTOR #1……………….10.2
VECTOR #2……………….10.8
DAVIS #1………………..M
DAVIS #2………………..M
RMY #1………………….10.1 NNW
RMY #2………………….10.5 N
RICHARDS (C5C)…………..10.7
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..0.45 DEPARTURE…..-1.22
TOTAL PRECIPITATION FOR THE YEAR…………..18.65 DEPARTURE…..-1.80
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 (2022-2023)……34.9 DEPARTURE…..-34.8
————————————————————–
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
5/1 63/45/54/+1/0.04/0.0/540/64 44 SSE VEC1 46 SSE RMY 48
5/2 57/43/50/-4/0.22/0.0/144/17 33 S VEC1 34 S RMY 35
5/3 55/42/49/-5/0.01/0.0/093/11 25 E VEC1 25 E RMY 25
5/4 45/40/43/-11/0.07/0.0/009/01 29 NE VEC1 29 NE RMY 29
5/5 59/43/51/-4/0.07/0.0/367/43 18 NE VEC1 19 NE RMY 19
5/6 74/43/59/+4/0.00/0.0/847/99 25 NW VEC1 26 NW RMY 26
5/7 78/52/65/+10/0.01/0.0/…/.. 26 WNW VEC1 27 W RMY 28
5/8 74/49/62/+7/0.03/0.0/…/.. 32 NW VEC1 33 NW RMY 35
5/9 60/45/53/-3/0.00/0.0/…/.. 24 NE VEC1 25 NE RMY 25
5/10 72/51/62/+6/0.00/0.0/…/.. 25 WSW VEC1 26 WSW RMY 26
5/11 81/53/67/+11/T/0.0/…/.. 30 W VEC1 30 W RMY 30
5/12 84/57/71/+14/T/0.0/…/.. 31 WNW VEC1 35 WNW RMY 34
5/13 81/58/70/+13/0/0.0/…/.. 28 NNW VEC1 30 NNW RMY 35
5/14 66/47/57/+/0.00/0.0/…/.. 28 NNW VEC1 29 NNW RMY 31
5/15 The low since midnight is 45F, the daily normal low is 48F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR MAY 15
HIGH 93F IN 1900
LOW 36F IN 1947,1985
PRECIP 1.63 INCHES IN 1978
PEAK GUST 53e MPH NE IN 1978, W 2002
RECORDS FOR MAY 16
HIGH 90F IN 1951
LOW 30F IN 1936
PRECIP 2.63 INCHES IN 1954
PEAK GUST 56e MPH NW IN 1952
TODAY’S REPORT PREPARED BY: Matt Douglas
