Wednesday, April 19, 2023

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

WEDNESDAY, APRIL 19, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0457E
SUNSET:  1830E

SUNSHINE FADES BEHIND CONVECTIVE CLOUDS; STILL BREEZY AND COOL…

Much like yesterday, the day started with a decent amount of
sunshine following a very photogenic sunrise. However, as heating
from the sun increased mid to late morning, clouds increased in
number and coverage. Skies have been overcast since the late
morning hours.

The temperature has been chilly today, with a low dew point and
gusty winds, it feels rather chilly today. Temperatures started
the day in the upper 30s, and have only so far reached a peak in
the upper 40s. Readings have settled back a bit into the mid 40s
since the sky went to overcast. Will we even make it to 50F
today? Stay tuned!

The wind has been busy again today with frequent gusts of
25-30mph. The highest gust so far today is around 35mph. The
average speed for the day so far is around 13mph.

Visibility has been excellent most of the day, rising from around
60 miles early this morning to around 80 miles for the balance of
the day.

The high temperature so far today is 49F degrees, which is 9
degrees below the normal high of 58F. The low since midnight
is 39F degrees, which is equal to the normal low of 39F.

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Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus distant all quadrants
Temperature: 41F; Dew Point: 26F; Relative Humidity: 55%
Wind: WNW @ 14G23 kts
Sea-level pressure: 1014.3 mb; 29.95 in. Hg: rising, then more slowly
Visibility: 60 miles
6-hr Max temp: 45F
6-hr Min temp: 39F
24-hr Precip:  TRACE
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 CLR 60 143/41/26/2914G23/995/ FEW SC DSNT ALQDS/
8/500 51019 70000 10045 20039

10 A.M.
Weather: Broken stratocumulus, broken altocumulus lenticularis
Temperature: 48F; Dew Point: 27F; Relative Humidity: 42%
Wind: WNW @ 11G20 kts
Sea-level pressure: 1014.7 mb; 29.96 in. Hg: rising, then more rapidly
Visibility: 80 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E45 BKN 65 BKN 80 147/48/27/2911G20/996/ 8/540 53004

1 P.M.
Weather: Overcast stratocumulus
Temperature: 46F; Dew Point: 28F; Relative Humidity: 49%
Wind: W @ 14G21 kts, peak wind WNW 30mph at 12:22 P.M.
Sea-level pressure: 1016.0 mb; 30.00 in. Hg: rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 49F
6-hr Min temp: 41F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 E50 OVC 80 160/46/28/2814G21/000/ PK WND 2926/22/
8/500 51013 10049 20041

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SUMMARY FOR TUESDAY, APRIL 18, 2023

TEMPERATURE (DEGREES F)
MAX…….57   NORMAL…..58
MIN…….45   NORMAL…..39
MEAN……51   NORMAL…..48

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+3
TOTAL DEPARTURE FOR THE MONTH……………….+122 [+6.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………14  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH…………..254  DEPARTURE……-115
TOTAL HEATING UNITS FOR THE SEASON…………4786  DEPARTURE……-929
TOTAL HEATING UNITS LAST SEASON TO DATE…….5163  DEPARTURE……-377

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)………..39 WSW @  1:31 P.M.
VECTOR #1 (1-Sec)……….41 WSW @  1:31 P.M.
VECTOR #2 (1-Sec)……….40 W   @  1:31 P.M.
DAVIS #1……………….40 WSW @  1:31 P.M.
DAVIS #2 ………………39 W   @  1:31 P.M.
RMY #1 (Instantaneous)…..42 WSW @  1:31 P.M.
RMY #2 (Instantaneous)…..41 WSW @ 10:24 A.M.
MERLIN…………………37 W
RICHARDS (C5C) (Inst)……41     @ 10:16 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………28 W   @  4:52 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..26     @  2:28 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..27     @ 10:23 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………28 W   @  4:52 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………28 WSW @ 10:23 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..26 WSW @  2:28 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..27 WSW @ 10:23 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………25     @  4:52 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..13.6 WSW [326 total miles] VECTOR #1………………13.3
VECTOR #2………………13.9
DAVIS #1……………….13.6 WSW
DAVIS #2……………….14.0 W
RMY #1…………………13.0 WSW
RMY #2…………………13.7 WSW
RICHARDS (C5C)………….13.2

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH…………..0.54 DEPARTURE…..-2.49
TOTAL PRECIPITATION FOR THE YEAR…………..15.15 DEPARTURE…..-1.90

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

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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/+19/0.00/0.0/515/65        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  The low since midnight is 39F, the daily normal low is 39F

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 19
HIGH 94 IN 1976 [RECORD FOR MONTH] LOW 21 IN 1890
PRECIP 1.71 IN 1969
SNOWFALL 1.3 IN. IN 1967
PEAK GUST 66 MPH E IN 1984

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

TODAY’S REPORT PREPARED BY: Matt Douglas