Sunday, April 16, 2023

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

SUNDAY, APRIL 16, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0502E
SUNSET:  1827E

CLOUDY AND COOLER WITH LIGHT DRIZZLE AND FOG THROUGH THE DAY…

A lot of clouds and fog have dominated the day with periods of
light drizzle, mainly on the very light side. We did managed to
get 0.04″ in the gauge at 7am from some light rain shower activity
very early this morning.

Visibility was next to zero this morning in fog, but did improve
briefly this afternoon to around 25 miles before dropping again.

The temperature started the day in the mid to upper 40s, and has
only recovered to the mid 50s this afternoon.

The wind has been quite light today only averaging around 8mph.
The highest gust was in the wee hours of the morning reaching
a speed of 21mph.

The high temperature so far today is 55F degrees, which is 2
degrees below the normal high of 57F. The low since midnight
is 47F degrees, which is 9 degrees above the normal low of 38F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 100ft, light drizzle
Temperature: 49F; Dew Point: 49F; Relative Humidity: 100%
Wind: NE @ 6 kts, wind light
Sea-level pressure: 1013.5 mb; 29.93 in. Hg: rising, then falling
Visibility: 1/16 mile, fog
6-hr Max temp: 49F
6-hr Min temp: 47F
24-hr Precip:  0.04
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 X W1 1/16L-F 135/49/49/0506/993/ WND LGT/ 8////
50002 6004/ 70004 10049 20047

10 A.M.
Weather: Sky obscured, vertical visibility 200ft, very light
drizzle
Temperature: 50F; Dew Point: 50F; Relative Humidity: 100%
Wind: ENE @ 7 kts
Sea-level pressure: 1013.1 mb; 29.92 in. Hg: rising then falling
Visibility: 1/8 mile, fog
3-hr Precip:  0.01 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 X W2 1/8L-F 131/50/50/0707/992/ PCPN VRY LGT/
8//// 58004 6001/

1 P.M.
Weather: Sky obscured, vertical visibility 300ft, very light
drizzle
Temperature: 52F; Dew Point: 50F; Relative Humidity: 92%
Wind: NNE @ 6 kts, wind light
Sea-level pressure: 1012.7 mb; 29.91 in. Hg: falling, then more slowly
Visibility: 3 miles, fog
6-hr Max temp: 53F
6-hr Min temp: 48F
6-hr Precip:  0.01 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 X W3 3L-F 127/52/50/0306/991/ PCPN VRY LGT
WND LGT/ 8//// 56004 6001/ 10053 20048

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SUMMARY FOR SATURDAY, APRIL 15, 2023

TEMPERATURE (DEGREES F)
MAX…….68   NORMAL…..56
MIN…….45   NORMAL…..38
MEAN……57   NORMAL…..47

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……..+10
TOTAL DEPARTURE FOR THE MONTH……………….+113 [+7.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….8  DEPARTURE…….-10
TOTAL HEATING UNITS FOR THE MONTH…………..211  DEPARTURE……-106
TOTAL HEATING UNITS FOR THE SEASON…………4743  DEPARTURE……-921
TOTAL HEATING UNITS LAST SEASON TO DATE…….5109  DEPARTURE……-366

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………….9  DEPARTURE……..+9
TOTAL HEATING UNITS FOR THE SEASON……………9  DEPARTURE……..+8
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)………..20 ENE @  2:16 P.M.
VECTOR #1 (1-Sec)……….20 ENE @  2:06 P.M.
VECTOR #2 (1-Sec)……….21 ENE @  2:09 P.M.
DAVIS #1……………….20 E   @  2:19 P.M.
DAVIS #2 ………………19 ENE @  2:05 P.M.
RMY #1 (Instantaneous)…..21 ENE @  2:18 P.M.
RMY #2 (Instantaneous)…..21 ENE @  2:09 P.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……19     @  2:17 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 ENE @  2:20 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15     @  3:19 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15     @  2:10 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 ENE @  3:20 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 E   @  3:19 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 ENE @  3:19 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 ENE @  3:19 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15     @  3:19 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..7.7 ENE [184 total miles] VECTOR #1………………8.0
VECTOR #2………………8.5
DAVIS #1……………….8.2 ENE
DAVIS #2……………….8.4 ENE
RMY #1…………………8.0 NE
RMY #2…………………8.4 NE
RICHARDS (C5C)………….8.5

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.04 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH…………..0.47 DEPARTURE…..-2.11
TOTAL PRECIPITATION FOR THE YEAR…………..15.08 DEPARTURE…..-1.52

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……-2.2
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-34.2

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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  68/45/57/+10/T/0.0/…/..           20 ENE  VEC1 20 ENE RMY 21

4/16  The low since midnight is 47F, 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

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 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

RECORDS FOR APRIL 17
HIGH 93 IN 2002
LOW 21 IN 1908
PRECIP 1.68 IN 1954
SNOWFALL 1.0 IN. IN 1899
PEAK GUST 63 MPH ESE IN 2011

TODAY’S REPORT PREPARED BY: Matt Douglas/Amanda Joly