Wednesday, April 17, 2024

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

WEDNESDAY, APRIL 17, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0459E
SUNSET:  1829E

COOLER TEMPERATURES, BUT VERY NICE WEATHER CONTINUES TODAY ON
BLUE HILL….

Clouds, mainly of the high thin variety, have been increasing
as the day progresses. However we’ve still observed plenty of
sunshine to this point, which is making for yet another very
fine day here.

Temperatures are cooler than they have been the last couple of
days, but it’s still mild enough outdoors to be able to enjoy
activities comfortably. Readings today have been held in the
mid to upper 50s thanks to an onshore flow off the ocean. The
dew point still remains on the low side with readings in the
low to mid 30s.

The wind has been fairly steady out of the east-northeast to
east today, averaging at around 8mph for much of the day. The
peak gust so far is around 23mph, which occurred back around 1am.

Visibility has been excellent all day thanks to the dry air mass.
The view has been holding around 70 miles today.

The maximum temperature so far today is 58F degrees, which is 1
degree above the normal high of 57F. The minimum temperature since
midnight is 40F degrees, which is 1 degree above the normal low
of 39F.

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Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus distant E-ESE, few altocumulus
distant SSE-W, few cirrus all quadrants
Temperature: 45F; Dew Point: 31F; Relative Humidity: 56%
Wind: ENE @ 7 kts
Sea-level pressure: 1024.6 mb; 30.26 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 46F
6-hr Min temp: 40F
24-hr Precip:  0.00 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 70 246/45/31/0707/026/ FEW SC DSNT E-ESE FEW AC DSNT
SSE-W FEW CI ALQDS/ 8/551 51012 10046 20040

10 A.M.
Weather: Thin broken cirrus, few stratocumulus distant NNE and
distant ESE-SE
Temperature: 50F; Dew Point: 34F; Relative Humidity: 54%
Wind: E @ 6 kts, wind light
Sea-level pressure: 1023.8 mb; 30.23 in. Hg: falling, then more rapidly
Visibility: 70 miles
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E250 -BKN 70 238/50/34/0806/023/ FEW SC DSNT NNE AND DSNT
ESE-SE WND LGT/ 8/504 58008

1 P.M.
Weather: Thin broken cirrus, few stratocumulus distant SSE-SW-NW,
few altocumulus/castellanus distant S-W
Temperature: 56F; Dew Point: 34F; Relative Humidity: 42%
Wind: E @ 9 kts
Sea-level pressure: 1021.7 mb; 30.17 in. Hg: falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 58F
6-hr Min temp: 45F
6-hr Precip:  0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E250 -BKN 70 217/56/34/0809/017/ FEW SC DSNT SSE-SW-NW
FEW AC/ACC DSNT S-W/ 8/584 56021 10058 20045

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SUMMARY FOR TUESDAY, APRIL 16, 2024

TEMPERATURE (DEGREES F)
MAX…….68   NORMAL…..57
MIN…….44   NORMAL…..38
MEAN……56   NORMAL…..47

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+9
TOTAL DEPARTURE FOR THE MONTH……………………+41 [+2.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….9  DEPARTURE……..-9
TOTAL HEATING UNITS FOR THE MONTH…………..303  DEPARTURE…….-32
TOTAL HEATING UNITS FOR THE SEASON…………4944  DEPARTURE……-737
TOTAL HEATING UNITS LAST SEASON TO DATE…….4757  DEPARTURE……+187

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated

F420C (Official)……….E29 NW   @  11:53 A.M.
VECTOR #1 (1-Sec)……….28 NW   @  11:21 A.M.
VECTOR #2 (1-Sec)……….31 WNW  @  11:22 A.M.
DAVIS #1……………….28 W    @  12:00 P.M.
DAVIS #2 ………………27 WNW  @  11:20 A.M.
RMY #1 (Instantaneous)…..29 NW   @  11:21 A.M.
RMY #2 (Instantaneous)…..31 WNW  @  11:22 A.M.
MERLIN…………………27 NW
RICHARDS (C5C) (Inst)……28      @  11:21 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 WNW  @  11:36 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..19      @  11:23 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23      @  11:23 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 WNW  @  11:23 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………22 NW   @  11:23 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 NW   @  11:48 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..22 WNW  @  11:22 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………20      @  11:23 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….9.7 NW [225 total miles] VECTOR #1……………..9.7
VECTOR #2…………….10.5
DAVIS #1………………9.9 NW
DAVIS #2……………..10.2 NNW
RMY #1………………..9.4 NW
RMY #2……………….10.3 NW
RICHARDS (C5C)………..10.1

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE MONTH…………..3.67 DEPARTURE…..+0.95
TOTAL PRECIPITATION FOR THE YEAR (2024)…….23.72 DEPARTURE…..+6.98

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE……-0.1
TOTAL SNOWFALL FOR THE MONTH………………..0.7 DEPARTURE……-1.6
TOTAL SNOWFALL FOR THE SEASON (2023-2024)……26.8 DEPARTURE…..-42.4

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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
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

4/1   56/40/48/+7/0.00/0.0/153/20         20 SSE VEC1 20 SSE RMY 19
4/2   47/35/41/0/0.07/0.0/115/15          25 E   VEC1 25 E   RMY 25
4/3   41/34/38/-4/1.10/T/000/00           53 E   VEC1 53 E   RMY 53
4/4   36/32/34/-8/1.25/0.7/000/00         63 ENE VEC1 64 ENE RMY 68
4/5   45/31/38/-5/0.01/T/147/19           33 WNW VEC1 31 WNW RMY 33
4/6   43/33/38/-5/0.08/093/12             35 N   VEC1 35 N   RMY 35
4/7   48/34/41/-3/T/0.0/094/12            32 N   VEC1 31 N   RMY 31
4/8   66/36/51/+7/0.00/0.0/636/81         23 WNW VEC1 23 WNW RMY 22
4/9   63/40/52/+8/0.00/0.0/741/94         22 ENE VEC1 21 ENE RMY 21
4/10  65/38/52/+7/T/0.0/348/44            26 S   VEC1 26 S   RMY 30
4/11  55/42/49/+4/0.04/0.0/000/00         32 SSE VEC1 32 SSE RMY 31
4/12  60/46/53/+7/1.03/0.0/…/..         62 SSE VEC1 62 S   RMY 63
4/13  54/43/49/+3/T/0.0/…/..            43 W   VEC1 42 WNW RMY 46
4/14  58/42/50/+3/0.09/0.0/…/..         33 WSW VEC1 33 WSW RMY 35
4/15  73/43/58/+11/T/0.0/…/..           33 NW  VEC1 33 NW  RMY 34
4/16  68/44/56/+9/0.00/0.0/…/..         29 NW  VEC1 28 NW  RMY 29

4/17 The low since midnight is 40F, the daily normal low is 39F.

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APRIL DAILY RECORDS TO DATE

NONE…

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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