Thursday, April 27, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, APRIL 27, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0445E
SUNSET: 1839E
SUNSHINE TO START THE DAY, THEN BUILDING CONVECTIVE CLOUDS WITH
RAIN SHOWERS IN THE AREA…
We started the day with mostly sunny skies, but as daytime heating
got underway, convective clouds quickly began to build. These
clouds have culminated into cumulonimbus clouds producing rain
showers in the area, but so far they have missed the hill. A hail
shaft was observed at the 1pm observation off the NNE, just beyond
downtown Boston.
The temperature reached the upper 50s early this afternoon before
slipping back a bit, first due to clouds, and then further due to
the development of a sea-breeze.
The wind has been generally light all day, mainly out of a
westerly direction up until mid afternoon, then shifted to a sea-
breeze. The average speed for the day is only around 7mph.
Visibility has been limited today with the view of only 20-35
miles being seen, thanks to somewhat high moisture content in
the air.
The high temperature so far today is 59F, which is 2 degrees
below the normal low of 61F. The low since midnight is 42F, this
is equal to the normal low of 42F.
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Today’s Observations:
7 A.M.
Weather: Broken stratocumulus
Temperature: 46; Dew Point: 42F; Relative Humidity: 85%
Wind: SW @ 6 kts, wind light
Sea-level pressure: 1025.1 mb; 30.27 in. Hg: rising, then more rapidly
Visibility: 20 miles, thin fog
6-hr Max temp: 46F
6-hr Min temp: 42F
24-hr Precip: Trace
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E10 BKN 40 BKN 20 251/46/42/2306/027/ THN F ALQDS
WND LGT/ 8/500 53010 6000/ 70000 10046 20042
10 A.M.
Weather: Scattered cumulus, broken stratocumulus
Temperature: 53F; Dew Point: 41F; Relative Humidity: 64%
Wind: NW @ 4 kts, wind light
Sea-level pressure: 1024.5 mb; 30.25 in. Hg: falling, then more rapidly
Visibility: 30 miles, hazy
3-hr Precip: 0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 24 SCT E35 BKN 30 245/53/41/3204/025/ HAZY WND LGT/
8/400 58006
1 P.M.
Weather: Scattered stratus fractus, broken cumulonimbus,
broken altocumulus, virga N-E
Temperature: 57F; Dew Point: 40F; Relative Humidity: 54%
Wind: W @ 9 kts
Sea-level pressure: 1023.7 mb; 30.23 in. Hg: falling, then more rapidly
Visibility: 35 miles, hazy
6-hr Max temp: 59F
6-hr Min temp: 46F
6-hr Precip: 0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 25 SCT E45 BKN 120 BKN 35 237/57/40/2709/023/
CB NNE-E MOV E VIRGA N-E HAIL SHAFT VSBL NNE HAZY/ 8/360
58008 10059 20046
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SUMMARY FOR WEDNESDAY, APRIL 26, 2023
TEMPERATURE (DEGREES F)
MAX…….55 NORMAL…..61
MIN…….42 NORMAL…..42
MEAN……49 NORMAL…..52
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………-3
TOTAL DEPARTURE FOR THE MONTH……………….+110 [+4.0 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………16 DEPARTURE……..+2
TOTAL HEATING UNITS FOR THE MONTH…………..384 DEPARTURE……-105
TOTAL HEATING UNITS FOR THE SEASON…………4916 DEPARTURE……-919
TOTAL HEATING UNITS LAST SEASON TO DATE…….5287 DEPARTURE……-371
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….9 DEPARTURE……..+7
TOTAL COOLING UNITS FOR THE SEASON……………9 DEPARTURE……..+7
TOTAL COOLING UNITS LAST SEASON TO DATE……….0 DEPARTURE……..+9
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
F420C (Official)………..20 NE @ 2:41 P.M.
VECTOR #1 (1-Sec)……….21 E @ 4:20 P.M.
VECTOR #2 (1-Sec)……….22 ENE @ 3:10 P.M.
DAVIS #1……………….21 E @ 3:10 P.M.
DAVIS #2 ………………21 ENE @ 3:31 P.M.
RMY #1 (Instantaneous)…..22 NE @ 2:41 P.M.
RMY #2 (Instantaneous)…..22 ENE @ 3:10 P.M.
MERLIN…………………21 NE
RICHARDS (C5C) (Inst)……20 @ 2:41 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 ENE @ 2:55 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 @ 4:22 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16 @ 4:21 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 E @ 4:22 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 E @ 4:21 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 E @ 4:22 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 E @ 4:21 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………16 @ 4:21 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.0 ENE [169 total miles]
VECTOR #1……………….7.1
VECTOR #2……………….7.4
DAVIS #1………………..7.4 E
DAVIS #2………………..7.3 ESE
RMY #1………………….7.2 E
RMY #2………………….6.4 E
RICHARDS (C5C)…………..7.9
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH…………..1.64 DEPARTURE…..-2.55
TOTAL PRECIPITATION FOR THE YEAR…………..16.25 DEPARTURE…..-1.96
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……-2.7
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-34.7
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR APRIL 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
4/1 60/39/50/+9/0.39/0.0/145/19 36 SW VEC1 40 SW RMY 41
4/2 50/30/40/-1/0.00/0.0/636/83 40 NNW VEC1 44 NNW RMY 45
4/3 51/28/40/-2/0.00/0.0/737/96 41 SSW VEC1 46 SSW RMY 46
4/4 62/40/51/+9/0.00/0.0/594/77 26 ENE VEC1 26 ENE RMY 27
4/5 45/37/41/-2/0.02/0.0/000/00 33 ENE VEC1 34 ENE RMY 37
4/6 62/37/50/+7/0.02/0.0/155/20 26 NW VEC1 28 NNW RMY 29
4/7 58/36/47/+3/0.00/0.0/328/42 45 WNW VEC1 48 WNW RMY 52
4/8 50/29/40/-4/0.00/0.0/767/98 26 NNW VEC1 29 NNW RMY 31
4/9 54/33/44/0/0.00/0.0/770/98 25 S VEC1 28 S RMY 28
4/10 65/33/49/+4/0.00/0.0/772/98 18 WSW VEC1 19 NW RMY 20
4/11 75/45/60/+15/0.00/0.0/522/66 37 W VEC1 37 W RMY 38
4/12 73/56/65/+19/0.00/0.0/515/65 46 NW VEC1 49 NW RMY 52
4/13 88/52/70/+24/0.00/0.0/764/96 25 W VEC1 26 WNW RMY 27
4/14 88/50/69/+22/0.00/0.0/711/89 24 WNW VEC1 27 WNW RMY 26
4/15 68/45/57/+10/T/0.0/401/50 20 ENE VEC1 20 ENE RMY 21
4/16 55/46/51/+4/0.05/0.0/000/00 21 NE VEC1 22 NE RMY 21
4/17 55/45/50/+2/0.06/0.0/000/00 17 NE VEC1 18 ENE RMY 18
4/18 57/45/51/+3/T/0.0/446/55 39 WSW VEC1 41 WSW RMY 42
4/19 49/37/43/-6/0.00/0.0/244/30 35 WNW VEC1 36 WNW RMY 40
4/20 64/36/50/+1/0.00/0.0/693/85 23 NW VEC1 23 NNW RMY 23
4/21 55/42/49/-1/0.00/0.0/663/81 22 E VEC1 24 SE RMY 24
4/22 53/42/48/-2/0.27/0.0/000/00 28 ESE VEC1 31 ESE RMY 30
4/23 51/45/48/-2/0.72/0.0/000/00 30 SE VEC1 33 SE RMY 31
4/24 58/43/51/0/0.00/0.0/339/41 21 WNW VEC1 22 WNW RMY 22
4/25 61/42/52/+1/0.11/0.0/406/49 18 NNE VEC1 21 NNE RMY 21
4/26 55/42/49/-3/T/0.0/332/40 20 NE VEC1 21 E RMY 22
4/27 The low since midnight is 42F, the daily normal low is 42F
DAILY RECORDS
04/12/2023: NEW RECORD HIGH MINIMUM TEMPERATURE OF 56F,
THIS BEATS THE OLD RECORD OF 52F SET IN 1945 AND 1947
04/13/2023: NEW RECORD HIGH MAXIMUM TEMPERATURE OF 88F,
THIS BEATS THE OLD RECORD OF 85F SET IN 1945
04/14/2023: NEW RECORD HIGH MAXIMUM TEMPERATURE OF 88F,
THIS BEATS THE OLD RECORD OF 80F SET IN 1945
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR APRIL 27
HIGH 93 IN 1990
LOW 28 IN 1919
PRECIP 1.89 IN 1979
SNOWFALL 2.7 IN. IN 1993
PEAK GUST 65e MPH N IN 1941
RECORDS FOR APRIL 28
HIGH 92 IN 1990, 2009
LOW 26 IN 1947
PRECIP 2.41 IN 1904
SNOWFALL 10.0 IN. IN 1987
PEAK GUST 69 MPH NE 1967
TODAY’S REPORT PREPARED BY: Matt Douglas
