Sunday, May 12, 2024
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, MAY 12, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0425E
SUNSET: 1856E
MORE CLOUDS THAN SUN, BUT STILL A RATHER PLEASANT MOTHER’S DAY….
Despite the birth of cloud cover, there has been enough
filtered sunshine to make for a pleasant day. The lack of wind
is helping it feel nice despite temperatures still running a
few degrees below normal.
As mentioned, the temperature is still running on the cool side
with readings so far approaching the 60F degree mark. The dew
point has dropped into the mid 30s, so the air mass is rather
dry once again today.
The wind has been quite light today, and has become variable as
we moved into the afternoon hours. The average speed so far for
the day is only around 5mph. The highest wind speed (hard to call
it a gust) so far for the day is a rather pitiful 13mph!
Visibility has improved a great deal between early this morning
and early this afternoon. The view increased from around 30-35
miles to an excellent 80 miles.
The maximum temperature so far today is 60F degrees, which is
6 degrees below the normal high of 66F. The minimum temperature
since midnight is 41F degrees, which is 6 degrees below the
normal low of 47F.
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Today’s Observations:
7 A.M.
Weather: Thin broken cirrus, few stratocumulus distant all quadrants,
few altocumulus distant WSW-N-ESE
Temperature: 45F; Dew Point: 40F; Relative Humidity: 81%
Wind: SSW @ 5 kts, wind light
Sea-level pressure: 1013.1 mb; 29.92 in. Hg: rising, then steady
Visibility: 35 miles, hazy
6-hr Max temp: 45F
6-hr Min temp: 41F
24-hr Precip: 0.00 inches
BHO SA 1155 E250 -BKN 35 131/45/40/2005/992/ FEW SC DSNT ALQDS
FEW AC DSNT WSW-N-ESE HAZY WND LGT/ 8/554 51008 10045 20041
10 A.M.
Weather: Scattered cumulus, scattered altocumulus, broken cirrostratus,
broken cirrus
Temperature: 53F; Dew Point: 36F; Relative Humidity: 50%
Wind: S @ 4 kts, wind light
Sea-level pressure: 1013.1 mb; 29.92 in. Hg: rising, then falling
Visibility: 70 miles
3-hr Precip: 0.00 inches
BHO SA 1455 30 SCT 120 SCT E200 BKN 250 BKN 70 131/53/36/1804/992/
WND LGT/ 8/256 58000
1 P.M.
Weather: Broken cumulus, broken altocumulus, thin broken cirrus
Temperature: 57F; Dew Point: 37F; Relative Humidity: 47%
Wind: NNE @ 5 kts, wind light
Sea-level pressure: 1012.5 mb; 29.90 in. Hg: rising, then falling
Visibility: 80 miles
6-hr Max temp: 60F
6-hr Min temp: 45F
6-hr Precip: 0.00 inches
BHO SA 1755 E30 BKN 60 BKN 250 -BKN 80 125/57/37/0305/990/ WND LGT/
8/264 58006 10060 20045
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SUMMARY FOR SATURDAY, MAY 11, 2024
TEMPERATURE (DEGREES F)
MAX…….55 NORMAL…..66
MIN…….39 NORMAL…..47
MEAN……47 NORMAL…..56
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….-9
TOTAL DEPARTURE FOR THE MONTH……………………-16 [-1.7 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………18 DEPARTURE……..+9
TOTAL HEATING UNITS FOR THE MONTH…………..130 DEPARTURE…….+13
TOTAL HEATING UNITS FOR THE SEASON…………5287 DEPARTURE……-717
TOTAL HEATING UNITS LAST SEASON TO DATE…….5073 DEPARTURE……+214
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……..-3
TOTAL COOLING UNITS FOR THE SEASON……………2 DEPARTURE……..-6
TOTAL COOLING UNITS LAST SEASON TO DATE………11 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)……….E26 ENE @ 11:53 A.M.
VECTOR #1 (1-Sec)……….26 ENE @ 10:53 A.M.
VECTOR #2 (1-Sec)……….25 ENE @ 10:05 A.M.
DAVIS #1……………….26 ENE @ 10:53 A.M.
DAVIS #2 ………………25 E @ 10:53 A.M.
RMY #1 (Instantaneous)…..27 NE @ 10:53 A.M.
RMY #2 (Instantaneous)…..26 ENE @ 10:05 A.M.
MERLIN…………………24 ENE
RICHARDS (C5C) (Inst)……25 @ 10:53 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 E @ 01:46 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17 @ 10:55 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 @ 10:58 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 ENE @ 10:55 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 ENE @ 10:55 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 ENE @ 10:55 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 ENE @ 10:58 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………17 @ 10:55 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….8.3 ENE [198 total miles]
VECTOR #1……………..8.2
VECTOR #2……………..8.8
DAVIS #1………………8.7 ENE
DAVIS #2………………8.6 ENE
RMY #1………………..8.3 ENE
RMY #2………………..8.7 ENE
RICHARDS (C5C)…………8.8
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH…………..1.26 DEPARTURE…..-0.08
TOTAL PRECIPITATION FOR THE YEAR (2024)…….26.22 DEPARTURE…..+6.10
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/…/.. 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 55/39/47/-9/0.00/0.0/…/.. 26 ENE VEC1 26 NE RMY 27
5/12 The low since midnight is 41F, the daily normal low is 47F.
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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 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
RECORDS FOR MAY 13
HIGH 85F IN 1947
LOW 32F IN 2020
PRECIP 2.39 INCHES IN 2006
PEAK GUST 49 MPH NNW IN 1965
TODAY’S REPORT PREPARED BY: Matt Douglas
