Thursday, May 30, 2024

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

THURSDAY, MAY 30, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0411E
SUNSET: 1913E

HEAVY SHOWERS AND THUNDERSTORMS THIS MORNING; LIGHTER SHOWERS
AND GUSTY WINDS INTO THIS AFTERNOON….

Rain showers began around 2:30am this morning and have
continued through the early afternoon hours. The heaviest of
the rain, which also included some thunderstorms, moved
through between 6-10am this morning. 0.60″ of rain was
measured at 7am with an additional 0.78″ falling within the
3 hours between 7am and 10am. While the intensity of the
showers let up significantly after 10am, very light rain
showers continue to fall this afternoon.

Through 1pm, 1.39″ of rain has fallen for today’s calendar
day, this has already broken the record precipitation for the
date. The previous record was 1.28″ set in 1948. We’ll see
what the final tally for today is early tomorrow morning.

The warmest temperature of the day was back at midnight with
58F being recorded at that time. Readings gradually fell
through most of the morning bottoming out at 50F around 9am,
then finally recovering a bit around 10am. It has been mostly
holding steady since. The day time readings have held in the
low to mid 50s so far. This is of course a good 15-20 degrees
below expected readings for this time of day in late May.

Winds were quite light overnight and early this morning, but
ramped up following a thunderstorm that moved through around
7am. Winds have been out of the north to north-northeast
since that time as well. The average speed for the day thus
far is around 11mph. Frequent gusts of 20-30mph have been
occurring. The peak gust for the day so far is 33mph, which
occurred at 9:14am this morning.

Visibility has been limited of course by the rain showers and
fog. We were in the clouds early this morning, at which time
we could only see around 1/8th of a mile. The view did improve
to around 30 miles for a time late this morning, but has
slipped again to around 12 miles or so early this afternoon.

The maximum temperature so far today is 58F degrees, which is
12 degrees below the normal high of 70F. The minimum temperature
since midnight is 50F degrees, which is 2 degrees below the
normal low of 52F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200ft, thunderstorm with
moderate rain showers
Temperature: 54F; Dew Point: 54F; Relative Humidity: 100%
Wind: NNW @ 5 kts, wind light
Sea-level pressure: 1013.3 mb; 29.92 in. Hg: rising, then more rapidly
Visibility: 1/8th mile, fog
6-hr Max temp: 57F
6-hr Min temp: 54F
24-hr Precip: 0.60 inches
BHO SA 1155 X W2 1/8TRWF 133/54/54/3405/992/ TB52 OCNL LTGICCC WND LGT/
8//// 53014 6060/ 70060 10057 20054

10 A.M.
Weather: Broken stratus fractus, overcast nimbostratus, very light
rain showers
Temperature: 52F; Dew Point: 50F; Relative Humidity: 95%
Wind: NNE @ 13G25 kts, peak wind N 33mph at 9:14 A.M.
Sea-level pressure: 1013.8 mb; 29.94 in. Hg: rising, then more slowly
Visibility: 30 miles, 20 miles N-NE, 15 miles ENE-ESE, thin fog
3-hr Precip: 0.78 inches
BHO SA 1455 E6 BKN 60 OVC 30RW- 138/52/50/0213G25/994/ THN F ALQDS
PCPN VRY LGT VSBY 20 N-NE 15 ENE-ESE PK WND 0129/14/ 8/72/ 51005 6078/

1 P.M.
Weather: Broken stratus fractus, overcast nimbostratus, very light
rain showers
Temperature: 52F; Dew Point: 51F; Relative Humidity: 95%
Wind: N @ 9G23 kts
Sea-level pressure: 1014.5 mb; 29.96in. Hg: steady, then rising
Visibility: 12 miles, 30 miles SW-W, 20 miles WNW-NNW, thin fog
6-hr Max temp: 54F
6-hr Min temp: 50F
6-hr Precip: 0.79 inches
BHO SA 1755 E10 BKN 60 OVC 12RW- 145/52/51/0109G23/996/ THN F ALQDS
PCPN VRY LGT VSBY 30 SW-W 20 WNW-NNW/ 8/72/ 53007 6079/ 10054 20050

————————————————————–

SUMMARY FOR WEDNESDAY, MAY 29, 2024

TEMPERATURE (DEGREES F)
MAX…….75 NORMAL…..70
MIN…….57 NORMAL…..52
MEAN……66 NORMAL…..61

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+5
TOTAL DEPARTURE FOR THE MONTH…………………….+53 [+1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-6
TOTAL HEATING UNITS FOR THE MONTH…………..208 DEPARTURE…….-39
TOTAL HEATING UNITS FOR THE SEASON…………5365 DEPARTURE……-769
TOTAL HEATING UNITS LAST SEASON TO DATE…….5188 DEPARTURE……+177

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….1 DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH……………37 DEPARTURE…….+15
TOTAL COOLING UNITS FOR THE SEASON…………..37 DEPARTURE…….+12
TOTAL COOLING UNITS LAST SEASON TO DATE………31 DEPARTURE……..+6

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)……….E21 W @ 12:57 A.M.
VECTOR #1 (1-Sec)……….21 W @ 12:57 A.M.
VECTOR #2 (1-Sec)……….22 W @ 01:04 A.M.
DAVIS #1……………….21 W @ 12:57 A.M.
DAVIS #2 ………………21 W @ 01:04 A.M.
RMY #1 (Instantaneous)…..21 W @ 12:52 A.M.
RMY #2 (Instantaneous)…..21 W @ 01:04 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…….M

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 W @ 01:17 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14 @ 12:57 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 @ 12:57 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 W @ 12:57 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 W @ 12:58 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 W @ 12:57 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..14 W @ 12:57 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……….M

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….6.4 WNW [153 total miles] VECTOR #1……………..7.0
VECTOR #2……………..7.2
DAVIS #1………………6.8 W
DAVIS #2………………6.9 WNW
RMY #1………………..6.6 W
RMY #2………………..7.1 W
RICHARDS (C5C)…………..M

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.60 DEPARTURE…..+0.46
TOTAL PRECIPITATION FOR THE MONTH…………..5.05 DEPARTURE…..+1.50
TOTAL PRECIPITATION FOR THE YEAR (2024)…….30.01 DEPARTURE…..+7.68

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/-2/0.00/0.0/588/68 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/0.0/718/82 33 SSW VEC1 33 SSW RMY 32
5/15 73/53/63/+6/0.46/0.0/079/09 24 ENE VEC1 24 E RMY 24
5/16 56/52/54/-4/1.02/0.0/141/16 32 ENE VEC1 32 ENE RMY 31
5/17 66/50/58/0/0.00/0.0/662/75 29 ENE VEC1 28 ENE RMY 27
5/18 58/50/54/-4/0.26/0.0/000/00 32 NE VEC1 33 NE RMY 34
5/19 53/48/51/-7/0.22/0.0/000/00 30 NE VEC1 30 NE RMY 30
5/20 65/48/57/-2/0.00/0.0/452/51 18 S VEC1 17 SSE RMY 18
5/21 84/50/67/+8/0.00/0.0/648/73 22 SSW VEC1 22 SSW RMY 22
5/22 88/56/72/+13/0.00/0.0/854/96 32 SSW VEC1 32 SSW RMY 33
5/23 75/61/68/+9/0.42/0.0/330/37 31 SSW VEC1 30 SSW RMY 31 TSTM
5/24 82/59/71/+11/0.00/0.0/876/96 38 W VEC1 38 W RMY 37
5/25 80/55/68/+8/0.00/0.0/752/84 24 S VEC1 23 SW RMY 25
5/26 79/58/69/+9/0.30/0.0/511/57 22 S VEC1 22 S RMY 22
5/27 75/61/68/+8/0.28/0.0/126/14 36 S VEC1 37 S RMY 39
5/28 80/62/71/+10/0.23/0.0/486/54 36 SSE VEC1 37 SSE RMY 36
5/29 75/57/66/+5/0.00/0.0/631/70 21 W VEC1 21 W RMY 21