Sunday, April 30, 2023

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

SUNDAY, APRIL 30, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0441E
SUNSET:  1842E

DENSE FOG, LIGHT DRIZZLE, AND CHILLY CONDITIONS TODAY…

A chilly, rainy start to the week here at Blue Hill. Overnight
precipitation recorded was 0.71 inches and an additional 0.04
inches were recorded during observations today. Temperatures
remained steady through the mid to upper 40’s and the humidity
has been 100% through the early afternoon. The barometric
pressure has steadily decreased since the morning hours.

The wind has remained steady today, with an average around
12mph and prevailing winds so far coming from the ENE. The
highest wind occurred just after midnight with a speed of
30 mph.

Dense fog in the area has made visibility 1/8 to 1/16 of a mile
for most of the day with a vertical visibility reaching only
200 ft.

The high temperature so far today is 50F degrees, which is 13
degrees below the normal high of 63F. The low since midnight is
46F, which is 3 degrees above the normal low of 43F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200 ft, light drizzle
Temperature: 47F; Dew Point: 47F; Relative Humidity: 100%
Wind: ENE @ 10 kts
Sea-level pressure: 1010.2 mb; 29.83 in. Hg: falling then more slowly
Visibility: 1/8 mile, fog
6-hr Max temp: 47F
6-hr Min temp: 46F
24-hr Precip:  0.71 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 X W2 1/8L-F 102/47/47/0610/983/ 8//// 56010 6045/
70071 10047 20046

10 A.M.
Weather: Sky obscured, vertical visibility 200 ft, light drizzle
Temperature: 48F; Dew Point: 48F; Relative Humidity: 100%
Wind: ENE @ 12 kts
Sea-level pressure: 1008.5 mb; 29.78 in. Hg: falling then more rapidly
Visibility: 1/16 mile, fog
3-hr Precip:  0.02 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 X W2 1/16L-F 085/48/48/0612/978/ 8//// 58017 6002/

1 P.M.
Weather: Sky obscured, vertical visibility 200 ft, light rain
Temperature: 49F; Dew Point: 49F; Relative Humidity: 100%
Wind: ENE @ 12 kts
Sea-level pressure: 1006.3 mb; 29.72 in. Hg: falling then more slowly
Visibility: 1/16 mile, fog
6-hr Max temp: 50F
6-hr Min temp: 47F
6-hr Precip:  0.04 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 X W2 1/16R-F 063/49/49/0612/972/ 8//// 56022 6004/ 10050 20047

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SUMMARY FOR SATURDAY, APRIL 29, 2023

TEMPERATURE (DEGREES F)
MAX…….55   NORMAL…..62
MIN…….44   NORMAL…..43
MEAN……50   NORMAL…..53

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………-3
TOTAL DEPARTURE FOR THE MONTH……………….+106 [+3.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………15  DEPARTURE……..+2
TOTAL HEATING UNITS FOR THE MONTH…………..426  DEPARTURE……-102
TOTAL HEATING UNITS FOR THE SEASON…………4958  DEPARTURE……-917
TOTAL HEATING UNITS LAST SEASON TO DATE…….5345  DEPARTURE……-387

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……..+6
TOTAL COOLING UNITS FOR THE SEASON……………9  DEPARTURE……..+6
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)……….E33 ESE @   11:35 P.M.
VECTOR #1 (1-Sec)……….34 ESE @   11:34 P.M.
VECTOR #2 (1-Sec)……….36 ESE @   11:34 P.M.
DAVIS #1……………….33 E   @   11:22 P.M.
DAVIS #2 ………………35 ESE @   11:34 P.M.
RMY #1 (Instantaneous)…..34 ESE @   11:34 P.M.
RMY #2 (Instantaneous)…..36 ESE @   11:34 P.M.
MERLIN…………………31 ESE
RICHARDS (C5C) (Inst)……32     @   11:34 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………24 ESE @   11:14 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..24     @   11:35 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23     @   11:15 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………25 ESE @   11:35 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………24 ESE @   11:36 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..23 ESE @   11:35 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 ESE @   11:15 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………24     @   11:35 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………12.9 ESE [310 total miles] VECTOR #1……………….12.6
VECTOR #2……………….12.4
DAVIS #1………………..13.2 ESE
DAVIS #2………………..12.6 ESE
RMY #1………………….12.6 ESE
RMY #2………………….12.3 ESE
RICHARDS (C5C)…………..13.1

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.71 DEPARTURE…..+0.57
TOTAL PRECIPITATION FOR THE MONTH…………..2.39 DEPARTURE…..-2.23
TOTAL PRECIPITATION FOR THE YEAR…………..17.00 DEPARTURE…..-1.64

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……-2.8
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-34.8

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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
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  62/41/52/0/0.00/0.0/…/..          20 ESE  VEC1 23 ESE RMY 22
4/29 55/44/50/-3/0.19/0.0/…/.. 33 ESE  VEC1 34 ESE RMY 34

4/30  The low since midnight is 46F, 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 30
HIGH 86 IN 1942
LOW 30 IN 1931
PRECIP 1.41 IN 1991
SNOWFALL 0.3 IN. IN 1909
PEAK GUST 64e MPH NW IN 1978

RECORDS FOR MAY 1
HIGH 87F IN 1899
LOW 29F IN 1978
PRECIP 2.53 INCHES IN 1921
SNOWFALL TRACE IN 1905,1917,1921,1995,2016
PEAK GUST 57 MPH NW IN 1974

TODAY’S REPORT PREPARED BY: Amanda Joly