Monday, April 15, 2024
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, APRIL 15, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0502E
SUNSET: 1826E
VERY FINE WEATHER ON THIS PATRIOT’S DAY WITH WARM TEMPERATURES….
It’s been a splendid day here atop Blue Hill with a mix of sun
and clouds, a gentle breeze, and much above normal temperatures.
Temperatures have warmed into the lower 70’s early this afternoon.
This is the first 70 degree reading of the year so far. In contrast,
we had already had 2 days with a high of 88F by this time last year
(4/13 and 4/14), which were each record highs. It’s always amazing
to see how much difference there can be from year to year. The dew
point has been holding in the 40s, so it’s a very comfortable feel
to the air today.
The wind was gentle this morning as we observed light wind speeds.
It has picked up in the last hour or so as the atmosphere starts to
really mix. Gusts have reached the 30mph mark just in time for the
1pm observation with a peak gust thus far of 32mph. The average
speed for the day so far is around 8mph, but is increasing for now.
Visibility has been a bit limited to 40-50 miles today due to
haziness. The haziness is due to mainly tree pollen, but the slight
bit of moisture in the air is also contributing.
The maximum temperature so far today is 71F degrees, which is 15
degrees above the normal high of 56F. The minimum temperature since
midnight is 43F degrees, which is 5 degrees above the normal low
of 38F.
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Today’s Observations:
7 A.M.
Weather: Clear, few altocumulus/castellanus all quadrants
Temperature: 49F; Dew Point: 45F; Relative Humidity: 86%
Wind: NW @ 5 kts, wind light
Sea-level pressure: 1009.4 mb; 29.81 in. Hg: steady, then rising
Visibility: 40 miles, hazy
6-hr Max temp: 49F
6-hr Min temp: 43F
24-hr Precip: 0.09 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 CLR 40 094/49/45/3105/981/ FEW AC/ACC ALQDS HAZY WND LGT/
8/080 53019 70009 10049 20043
10 A.M.
Weather: Scattered cumulus, broken altocumulus/castellanus
Temperature: 58F; Dew Point: 46F; Relative Humidity: 65%
Wind: WSW @ 5 kts, wind light
Sea-level pressure: 1010.5 mb; 29.84 in. Hg: rising, then falling
Visibility: 40 miles, hazy
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 45 SCT E95 BKN 40 105/58/46/2505/984/ HAZY WND LGT/
8/280 50011
1 P.M.
Weather: Broken cumulus
Temperature: 70F; Dew Point: 42F; Relative Humidity: 36%
Wind: WNW @ 16G28 kts, peak wind WNW 32mph at 12:52 P.M.
Sea-level pressure: 1008.8 mb; 29.79 in. Hg: falling, then steady
Visibility: 50 miles, hazy
6-hr Max temp: 71F
6-hr Min temp: 49F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E70 BKN 50 088/70/42/2916G28/979/ HAZY PK WND 2928/52/
8/200 56017 10071 20049
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SUMMARY FOR SUNDAY, APRIL 14, 2024
TEMPERATURE (DEGREES F)
MAX…….58 NORMAL…..56
MIN…….42 NORMAL…..37
MEAN……50 NORMAL…..47
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+3
TOTAL DEPARTURE FOR THE MONTH……………………+21 [+1.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………15 DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE MONTH…………..287 DEPARTURE…….-12
TOTAL HEATING UNITS FOR THE SEASON…………4928 DEPARTURE……-718
TOTAL HEATING UNITS LAST SEASON TO DATE…….4735 DEPARTURE……+193
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)……….E33 WSW @ 11:53 A.M.
VECTOR #1 (1-Sec)……….33 WSW @ 11:53 A.M.
VECTOR #2 (1-Sec)……….36 WNW @ 02:01 A.M.
DAVIS #1……………….32 WSW @ 11:51 A.M.
DAVIS #2 ………………33 WNW @ 02:02 A.M.
RMY #1 (Instantaneous)…..35 WSW @ 11:53 A.M.
RMY #2 (Instantaneous)…..36 WSW @ 11:53 A.M.
MERLIN…………………33 WSW
RICHARDS (C5C) (Inst)……35 @ 11:53 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………22 WNW @ 01:03 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..21 @ 12:38 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..24 @ 01:25 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 W @ 12:38 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………24 WNW @ 01:25 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..20 WSW @ 11:45 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 WNW @ 01:25 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………21 @ 12:38 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……12.1 WSW [291 total miles]
VECTOR #1…………….12.1
VECTOR #2…………….12.5
DAVIS #1……………..12.3 WSW
DAVIS #2……………..12.6 W
RMY #1……………….11.6 WSW
RMY #2……………….12.4 WSW
RICHARDS (C5C)………..12.1
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.09 DEPARTURE…..-0.08
TOTAL PRECIPITATION FOR THE MONTH…………..3.67 DEPARTURE…..+1.26
TOTAL PRECIPITATION FOR THE YEAR (2024)…….23.72 DEPARTURE…..+7.29
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……-1.4
TOTAL SNOWFALL FOR THE SEASON (2023-2024)……26.8 DEPARTURE…..-42.2
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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
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 The low since midnight is 43F, the daily normal low is 38F.
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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 15
HIGH 81 IN 1896
LOW 23 IN 1943
PRECIP 1.75 IN. IN 2007
SNOWFALL 1.0 IN. IN 1916, 1962
PEAK GUST 66 MPH E IN 2007
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
TODAY’S REPORT PREPARED BY: Matt Douglas
