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Thursday, April 20, 2023

April 20, 2023

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY, APRIL 20, 2023 ALL TIMES ARE…

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

THURSDAY, APRIL 20, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0456E
SUNSET:  1831E

CLOUDS EARLY THIS MORNING MOVED OUT LEAVING US WITH ABUNDANT
SUNSHINE AND MILDER TEMPERATURES…

Such a nice day today, especially when compared to the last
couple of days. Sunshine has been the theme after some early
morning clouds moved out. With much lighter wind and milder
temperatures, which have reached the mid 60s, it just feels
wonderful out there today (as long as you’re not right on the
coast where a sea-breeze is occurring).

The wind, as mentioned, is much lighter today with an average
speed of only around 9mph. The direction has been rather variable
this afternoon, but so far we’ve been able to avoid the sea-
breeze here at Blue Hill.

Visibility has been excellent most of the day, holding at around
70 miles all day.

The high temperature so far today is 65F degrees, which is 6
degrees above the normal high of 59F. The low since midnight
is 36F degrees, which is 4 degrees below the normal low of 40F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, scattered cirrus, few stratocumulus
distant NW-NE-E
Temperature: 40F; Dew Point: 27F; Relative Humidity: 57%
Wind: NNW @ 8G15 kts
Sea-level pressure: 1023.8 mb; 30.23 in. Hg: rising, then more rapidly
Visibility: 70 miles
6-hr Max temp: 40F
6-hr Min temp: 36F
24-hr Precip:  0.00 ins.
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 70 SCT 250 SCT 70 238/40/27/3308G15/023/ FEW SC DSNT
NW-NE-E/ 8/054 53011 10040 20036

10 A.M.
Weather: Clear, few stratocumulus distant NNW-E, few altocumulus
distant NNE-E and distant SE-SW-W
Temperature: 50F; Dew Point: 29F; Relative Humidity: 43%
Wind: NW @ 10G17 kts
Sea-level pressure: 1023.9 mb; 30.24 in. Hg: rising, then falling
Visibility: 70 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 CLR 70 239/50/29/3210G17/024/ FEW SC DSNT NNW-E
FEW AC DSNT NNE-E AND DSNT SE-SW-W/ 8/550 50001

1 P.M.
Weather: Thin scattered cirrus, few altocumulus distant SE-SW-W
Temperature: 59F; Dew Point: 28F; Relative Humidity: 29%
Wind: WNW @ 7 kts, wind W variable NNW
Sea-level pressure: 1021.7 mb; 30.17 in. Hg: falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 60F
6-hr Min temp: 40F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 250 -SCT 70 217/59/28/3007/017/ FEW AC DSNT SE-SW-W
WND 27V34/ 8/051 56022 10060 20040

————————————————————–

SUMMARY FOR WEDNESDAY, APRIL 19, 2023

TEMPERATURE (DEGREES F)
MAX…….49   NORMAL…..58
MIN…….37   NORMAL…..39
MEAN……43   NORMAL…..49

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………-6
TOTAL DEPARTURE FOR THE MONTH……………….+116 [+5.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………22  DEPARTURE……..+6
TOTAL HEATING UNITS FOR THE MONTH…………..276  DEPARTURE……-109
TOTAL HEATING UNITS FOR THE SEASON…………4808  DEPARTURE……-924
TOTAL HEATING UNITS LAST SEASON TO DATE…….5181  DEPARTURE……-373

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……..+8
TOTAL COOLING UNITS FOR THE SEASON……………9  DEPARTURE……..+8
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)………..35 WNW @ 10:51 A.M.
VECTOR #1 (1-Sec)……….36 WNW @ 10:51 A.M.
VECTOR #2 (1-Sec)……….37 WNW @ 10:53 A.M.
DAVIS #1……………….35 WNW @ 10:51 A.M.
DAVIS #2 ………………34 WNW @ 10:41 A.M.
RMY #1 (Instantaneous)…..40 WNW @ 11:10 A.M.
RMY #2 (Instantaneous)…..37 WNW @ 10:53 A.M.
MERLIN…………………32 NW
RICHARDS (C5C) (Inst)……36     @ 10:51 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………28 WNW @ 10:59 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..25     @ 10:58 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..27     @ 10:55 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………27 W   @ 10:58 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 NW  @ 10:55 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..24 WNW @ 10:58 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..26 WNW @ 10:55 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………25     @ 10:58 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..13.0 WNW [312 total miles] VECTOR #1………………12.6
VECTOR #2………………13.9
DAVIS #1……………….13.2 WNW
DAVIS #2……………….13.7 NW
RMY #1…………………12.1 WNW
RMY #2…………………13.5 WNW
RICHARDS (C5C)………….13.1

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..0.54 DEPARTURE…..-2.63
TOTAL PRECIPITATION FOR THE YEAR…………..15.15 DEPARTURE…..-2.04

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……-2.5
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-34.5

————————————————————–

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/…/..            39 WSW  VEC1 41 WSW RMY 42
4/19  49/37/43/-6/0.00/0.0/…/..         35 WNW  VEC1 36 WNW RMY 40

4/20  The low since midnight is 36F, the daily normal low is 40F

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 20
HIGH 88 IN 1927
LOW 18 IN 1897
PRECIP 1.14 IN 1972
SNOWFALL 2.5 IN. IN 1904, 1972
PEAK GUST 76 MPH WNW IN 1963

RECORDS FOR APRIL 21
HIGH 85 IN 1923
LOW 22 IN 1908
PRECIP 3.18 IN. IN 1991
SNOWFALL 0.8 IN. IN 1947
PEAK GUST 76e MPH NE IN 1940

TODAY’S REPORT PREPARED BY: Matt Douglas

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