Saturday, April 15, 2023

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

SATURDAY, APRIL 15, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0503E
SUNSET:  1825E

HAZY MORNING CLEARING FOR A BEAUTIFUL PARTLY CLOUDY AFTERNOON…

After two days of record breaking heat, today has been more
seasonable with a high so far of 68F, and a low since midnight
of 45F. The normal high temperature for today is 56F. Yesterday’s
high of 88F beats the previous record of 80F set back in 1945.

Visibility has been slightly limited due to distant haze throughout
the day. Early this morning, fog covered the summit of Great
Blue Hill. This began dissipating at about 6:45 AM EST and it has
been partly to mostly cloudy since.

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Today’s Observations:

7 A.M.
Weather: Overcast stratus
Temperature: 48F; Dew Point: 46F; Relative Humidity: 92%
Wind: N @ 7 kts
Sea-level pressure: 1015.7 mb; 29.99 in. Hg: rising unsteadily
Visibility: 10 miles, hazy
6-hr Max temp: 48F
6-hr Min temp: 45F
24-hr Precip:  0.00
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E10 OVC 10 157/48/46/3607/999/ HAZY/ 8/6// 52010 10048
20045

10 A.M.
Weather: Broken altocumulus
Temperature: 58F; Dew Point: 48F; Relative Humidity: 39%
Wind: NW @ 2 kts, light and variable
Sea-level pressure: 1015.8 mb; 30.00 in. Hg: rising then falling
Visibility: 20 miles, hazy
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E140 BKN 20 158/58/48/3202/000/ HAZY/ 8/050 50001

1 P.M.
Weather: Broken altocumulus
Temperature: 65F; Dew Point: 49F; Relative Humidity: 56%
Wind: E @ 8G11 kts
Sea-level pressure: 1015.3 mb; 29.98 in. Hg: rising then falling
Visibility: 30 miles, hazy
6-hr Max temp: 68F
6-hr Min temp: 48F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 E150 BKN 30 153/65/49/0808G11/998/ HAZY/ 8/050 58005
10068 20048

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SUMMARY FOR FRIDAY, APRIL 14, 2023

TEMPERATURE (DEGREES F)
MAX…….88R  NORMAL…..56
MIN…….50   NORMAL…..38
MEAN……69   NORMAL…..47

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……..+22
TOTAL DEPARTURE FOR THE MONTH……………….+103 [+7.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE…….-19
TOTAL HEATING UNITS FOR THE MONTH…………..203  DEPARTURE…….-96
TOTAL HEATING UNITS FOR THE SEASON…………4735  DEPARTURE……-911
TOTAL HEATING UNITS LAST SEASON TO DATE…….5099  DEPARTURE……-364

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….4  DEPARTURE……..+9
TOTAL HEATING UNITS FOR THE MONTH…………….9  DEPARTURE……..+9
TOTAL HEATING UNITS FOR THE SEASON……………9  DEPARTURE……..+9
TOTAL HEATING 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)………..24 WNW @ 2:23 A.M.
VECTOR #1 (1-Sec)……….27 WNW @ 2:23 A.M.
VECTOR #2 (1-Sec)……….30 WNW @ 2:50 A.M.
DAVIS #1……………….25 WNW @ 2:24 A.M.
DAVIS #2 ………………26 ESE @ 2:29 P.M.
RMY #1 (Instantaneous)…..26 WNW @ 2:38 A.M.
RMY #2 (Instantaneous)…..28 WNW @ 2:21 A.M.
MERLIN…………………22 SE
RICHARDS (C5C) (Inst)……25     @ 2:38 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………21 WNW @ 2:20 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19 WNW @ 2:28 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..21 WNW @ 2:29 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………19 WNW @ 2:28 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 WNW @ 2:23 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..18 WNW @ 2:28 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..21 WNW @ 2:23 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………19     @ 2:28 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.1 ESE [243 total miles] VECTOR #1………………10.2
VECTOR #2………………10.9
DAVIS #1……………….10.6 E
DAVIS #2……………….10.7 NE
RMY #1…………………10.1 NE
RMY #2…………………10.7 NW
RICHARDS (C5C)………….10.8

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..0.43 DEPARTURE…..-1.99
TOTAL PRECIPITATION FOR THE YEAR…………..15.04 DEPARTURE…..-1.40

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……-2.1
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-34.1

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PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
VEC1: Vector #1 1-second gust
RMY:  R.M. Young 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/…/..        46 NW   VEC1 49 NW  RMY 52
4/13  88/52/70/+24/0.00/0.0/…/..        25 W    VEC1 26 WNW RMY 27
4/14  88/50/69/+22/0.00/0.0/…/..        24 WNW  VEC1 27 WNW RMY 26

4/15  The low since midnight is 45F, the daily normal low is 38F

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

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR APRIL 15
HIGH 81 IN 1896
LOW 23 IN 1943
PRECIP 1.75 IN. IN 2007
SNOWFALL 1.0 IN. IN 1916, 1962
PEAK GUST 66 MPH E IN 2007

RECORDS FOR APRIL 16
HIGH 89 IN 2012
LOW 23 IN 1943
PRECIP 2.63 IN. IN 2018
SNOWFALL 3.6 IN. IN 2021
PEAK GUST 73 MPH E IN 2007

TODAY’S REPORT PREPARED BY: Samantha Richard