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Friday, April 28, 2023

April 28, 2023

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA FRIDAY, APRIL 28, 2023 ALL TIMES ARE…

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

FRIDAY, APRIL 28, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0444E
SUNSET:  1840E

FILTERED SUNSHINE WITH GRADUALLY INCREASING HIGH CLOUDS…

Finally a day with a decent amount of sunshine, albeit filtered
by increasing high cirrus clouds. After an abundance of cloudy
conditions this week, we’ll certainly take today’s weather.
Despite a light onshore wind, the temperature has still managed
to reach the 60 degree mark here on the hill. It’s just a
delightful day! However, this is the “calm before the storm” as
more clouds and rain are on the way for the weekend.

The wind has been light all day, mainly out of an easterly
direction. The average speed for the day is only around 8mph.

Visibility has been limited today with a view of only 10 miles
early this morning, gradually improving to 50 miles by early this
afternoon.

The high temperature so far today is 62F, which is equal to the
normal high of 62F. The low since midnight is 41F, this is 2
degrees below the normal low of 43F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Thin scattered cirrus, few stratocumulus all quadrants
under inversion, thin smoke layer all quadrants
Temperature: 48; Dew Point: 43F; Relative Humidity: 81%
Wind: NE @ 4 kts, wind light
Sea-level pressure: 1024.8 mb; 30.26 in. Hg: rising, then more slowly
Visibility: 10 miles, patchy ground fog
6-hr Max temp: 48F
6-hr Min temp: 41F
24-hr Precip:  0.04 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 250 -SCT 10 248/48/43/0504/026/ FEW SC ALQDS UNDR
INVRSN PTCHY GF ALQDS THN K LYR ALQDS WND LGT/ 8/501 51012 70004
10048 20041

10 A.M.
Weather: Scattered cumulus, thin broken cirrus
Temperature: 56F; Dew Point: 44F; Relative Humidity: 62%
Wind: ENE @ 6 kts, wind light and variable
Sea-level pressure: 1024.5 mb; 30.25 in. Hg: falling, then steady
Visibility: 30 miles, hazy
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 25 SCT E250 -BKN 30 245/56/44/0606/025/ HAZY WND L/V/
8/201 56003

1 P.M.
Weather: Thin broken cirrus, few cumulus SE-SW-NW-NNE
Temperature: 59F; Dew Point: 38F; Relative Humidity: 45%
Wind: ENE @ 7 kts
Sea-level pressure: 1023.7 mb; 30.23 in. Hg: falling, then rising
Visibility: 50 miles, hazy
6-hr Max temp: 60F
6-hr Min temp: 48F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1455 E250 -BKN 50 237/59/38/0607/023/ FEW CU SE-SW-NW-NNE
HAZY/ 8/204 55008 10060 20048

————————————————————–

SUMMARY FOR THURSDAY, APRIL 27, 2023

TEMPERATURE (DEGREES F)
MAX…….59   NORMAL…..61
MIN…….42   NORMAL…..42
MEAN……51   NORMAL…..52

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………-1
TOTAL DEPARTURE FOR THE MONTH……………….+109 [+3.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………14  DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH…………..398  DEPARTURE……-104
TOTAL HEATING UNITS FOR THE SEASON…………4930  DEPARTURE……-919
TOTAL HEATING UNITS LAST SEASON TO DATE…….5304  DEPARTURE……-374

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)………..26 NW  @   4:37 P.M.
VECTOR #1 (1-Sec)……….30 NW  @   4:37 P.M.
VECTOR #2 (1-Sec)……….28 NNW @   4:40 P.M.
DAVIS #1……………….26 NW  @   4:36 P.M.
DAVIS #2 ………………26 NNW @   4:40 P.M.
RMY #1 (Instantaneous)…..30 NW  @   4:36 P.M.
RMY #2 (Instantaneous)…..28 NNW @   4:40 P.M.
MERLIN…………………27 NW
RICHARDS (C5C) (Inst)……27     @   4:37 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 NW  @   4:42 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20     @   4:41 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..22     @   4:42 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 WNW @   4:42 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 NW  @   4:42 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 NW  @   4:41 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 NW  @   4:42 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………21     @   4:41 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………7.3 WSW [174 total miles] VECTOR #1……………….7.7
VECTOR #2……………….7.8
DAVIS #1………………..7.4 SW
DAVIS #2………………..7.7 SW
RMY #1………………….7.5 SW
RMY #2………………….7.8 SW
RICHARDS (C5C)…………..7.9

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.04 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..1.68 DEPARTURE…..-2.66
TOTAL PRECIPITATION FOR THE YEAR…………..16.29 DEPARTURE…..-2.07

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.1
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE……-2.8
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-34.8

————————————————————–

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  59/42/51/-1/0.04/0.0/450/54         26 NW   VEC1 30 NW  RMY 30

4/28  The low since midnight is 41F, the daily normal low is 43F

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 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

RECORDS FOR APRIL 29
HIGH 85 IN 1974
LOW 26 IN 1909
PRECIP 1.65 IN 1923
SNOWFALL 1.0 IN. IN 1987
PEAK GUST 55 MPH WNW IN 2010

TODAY’S REPORT PREPARED BY: Matt Douglas

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Blue Hill Observatory & Science Center · Legal

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Please read the full Policy before accessing Observatory data · Effective January 1, 2025

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Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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