Monday, April 17, 2023

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

MONDAY, APRIL 17, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0500E
SUNSET:  1828E

OVERCAST AND COOL WITH PERIODS OF DRIZZLE AND OCCASIONAL SHOWERS…

Another day stuck in the clouds here on the summit with visibility
holding at around 1/16 of a mile all day. Periods of light drizzle
and even some occasional rain showers have been moving through
during the course of the day. 0.02″ of rain was measured through
7am this morning, with an additional 0.04″ measured for the 6
hours ending at 1pm.

The temperature has been held in the mid to upper 40s most of the
day, finally reaching the 50 degree mark early this afternoon.
These cool temperatures are thanks to a light, but persistent
onshore flow.

As mentioned, the wind has been quite light today only averaging
around 8mph. The highest gust was early this morning with a value
of 17mph.

The high temperature so far today is 51F degrees, which is 6
degrees below the normal high of 57F. The low since midnight
is 45F degrees, which is 6 degrees above the normal low of 39F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 100ft
Temperature: 45F; Dew Point: 45F; Relative Humidity: 100%
Wind: ENE @ 6 kts, wind light
Sea-level pressure: 1007.0 mb; 29.74 in. Hg: rising, then falling
Visibility: 1/16 mile, fog
6-hr Max temp: 46F
6-hr Min temp: 45F
24-hr Precip:  0.02
24-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 X W1 1/16F 070/45/45/0606/974/ WND LGT/ 8////
58007 6001/ 70002 10046 20045

10 A.M.
Weather: Sky obscured, vertical visibility 100ft
Temperature: 48F; Dew Point: 48F; Relative Humidity: 100%
Wind: ENE @ 5 kts, wind light
Sea-level pressure: 1004.9 mb; 29.67 in. Hg: rising then falling
Visibility: 1/16 mile, fog
3-hr Precip:  0.03 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 X W1 1/16F 049/48/48/0705/967/ R-E19 WND LGT/
8//// 58021 6003/

1 P.M.
Weather: Sky obscured, vertical visibility 200ft, light
drizzle
Temperature: 51F; Dew Point: 51F; Relative Humidity: 100%
Wind: E @ 7 kts
Sea-level pressure: 1002.6 mb; 29.61 in. Hg: falling, then more rapidly
Visibility: 1/16 mile, fog
6-hr Max temp: 51F
6-hr Min temp: 45F
6-hr Precip:  0.04 ins.
6-hr Snowfall: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 X W2 1/16L-F 026/51/51/1007/961/ R-E10 L-B10/
8//// 58023 6004/ 10051 20045

————————————————————–

SUMMARY FOR SUNDAY, APRIL 16, 2023

TEMPERATURE (DEGREES F)
MAX…….55   NORMAL…..57
MIN…….46   NORMAL…..38
MEAN……51   NORMAL…..47

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+4
TOTAL DEPARTURE FOR THE MONTH……………….+117 [+7.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY……………14  DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE MONTH…………..225  DEPARTURE……-110
TOTAL HEATING UNITS FOR THE SEASON…………4757  DEPARTURE……-924
TOTAL HEATING UNITS LAST SEASON TO DATE…….5119  DEPARTURE……-362

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……..+9
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)………..21 NE  @  6:19 A.M.
VECTOR #1 (1-Sec)……….22 NE  @  1:54 A.M.
VECTOR #2 (1-Sec)……….22 NE  @  6:20 A.M.
DAVIS #1……………….21 ENE @  6:20 A.M.
DAVIS #2 ………………22 ENE @  6:20 A.M.
RMY #1 (Instantaneous)…..21 NE  @  7:34 A.M.
RMY #2 (Instantaneous)…..22 NE  @  7:34 A.M.
MERLIN…………………20 NE
RICHARDS (C5C) (Inst)……20     @  7:38 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 ENE @  1:15 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..16     @  1:42 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16     @  1:42 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………16 ENE @  1:42 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 ENE @  1:42 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 ENE @  1:42 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..16 ENE @  1:42 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15     @  1:42 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..7.2 NE [172 total miles] VECTOR #1………………7.3
VECTOR #2………………7.7
DAVIS #1……………….7.3 ENE
DAVIS #2……………….7.4 ENE
RMY #1…………………7.2 NE
RMY #2…………………7.6 NE
RICHARDS (C5C)………….7.8

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.02 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..0.49 DEPARTURE…..-2.24
TOTAL PRECIPITATION FOR THE YEAR…………..15.10 DEPARTURE…..-1.65

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……-2.3
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-34.3

————————————————————–

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  55/46/51/+4/0.05/0.0/…/..         21 NE   VEC1 22 NE  RMY 21

4/17  The low since midnight is 45F, 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 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

RECORDS FOR APRIL 18
HIGH 92 IN 1976
LOW 23 1887
PRECIP 1.48 IN 1954
SNOWFALL 4.3 IN. IN 2020
PEAK GUST 59 MPH S IN 1982

TODAY’S REPORT PREPARED BY: Matt Douglas