Monday, April 29, 2024
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, APRIL 29, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0441E
SUNSET: 1842E
INTERVALS OF SUNSHINE AND CLOUDS WITH COOLING TEMPERATURES….
The day started on the “warm” side with readings only dropping
into the upper 50s overnight. With partial sunshine this
morning, temperatures rose rapidly to 70F, but then the wind
shifted to an onshore direction and the temperature dropped
rapidly back to the upper 50s and low 60s. It was also a bit
humid this morning with the dew point in the mid to upper 50s,
however it quickly dropped into the mid-upper 40s following the
wind shift.
As mentioned, the sky has had varying amounts of cloud cover,
ranging from just high thin cirrus to a mid level overcast at
times. Some stratocumulus and cumulus have also been observed
for good measure.
The wind was generally light out of a northerly direction early
this morning, but shifted to the east-northeast and east during
the mid morning hours. The speed also increased with the shift
for a time with gusts reaching 20-25mph. The average speed for
the day so far is around 10mph, with a peak gust to this point
of 25mph.
Visibility was limited to around 30-35 miles early this morning,
but increased to around 60 miles when the dew point dropped
during mid morning.
The maximum temperature so far today is 70F degrees, which is
8 degrees above the normal high of 62F. The minimum temperature
since midnight is 58F degrees, which is 15 degrees above the
normal low of 43F.
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Today’s Observations:
7 A.M.
Weather: Thin broken cirrus, few stratocumulus distant SW-N,
few altocumulus all quadrants
Temperature: 65F; Dew Point: 56F; Relative Humidity: 72%
Wind: NNW @ 7 kts
Sea-level pressure: 1015.6 mb; 29.99 in. Hg: rising, then more slowly
Visibility: 35 miles, hazy
6-hr Max temp: 65F
6-hr Min temp: 58F
24-hr Precip: Trace
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E250 -BKN 35 156/65/56/3407/999/ FEW SC DSNT SW-N
FEW AC ALQDS HAZY/ 8/551 51015 70000 10065 20058
10 A.M.
Weather: Scattered cumulus, broken altocumulus, thin broken cirrus
Temperature: 60F; Dew Point: 48F; Relative Humidity: 63%
Wind: ENE @ 12G17 kts
Sea-level pressure: 1016.8 mb; 30.03 in. Hg: rising, then more rapidly
Visibility: 60 miles
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 45 SCT E95 BKN 250 -BKN 60 168/60/48/0712G17/003/ WSHFT 57/
8/251 53012
1 P.M.
Weather: Overcast altocumulus/altostratus, few cumulus distant S-W-N
Temperature: 59F; Dew Point: 45F; Relative Humidity: 59%
Wind: E @ 7 kts
Sea-level pressure: 1017.0 mb; 30.03 in. Hg: rising, then steady
Visibility: 60 miles
6-hr Max temp: 70F
6-hr Min temp: 58F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E85 OVC 60 170/59/45/0807/003/ FEW CU DSNT S-W-N/ 8/27/
51002 10070 20058
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SUMMARY FOR SUNDAY, APRIL 28, 2024
TEMPERATURE (DEGREES F)
MAX…….67 NORMAL…..62
MIN…….41 NORMAL…..43
MEAN……54 NORMAL…..52
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+2
TOTAL DEPARTURE FOR THE MONTH……………………+11 [+0.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………11 DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH…………..511 DEPARTURE……..-4
TOTAL HEATING UNITS FOR THE SEASON…………5152 DEPARTURE……-710
TOTAL HEATING UNITS LAST SEASON TO DATE…….4943 DEPARTURE……+209
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)……….E28 WSW @ 12:35 A.M.
VECTOR #1 (1-Sec)……….27 WSW @ 12:37 A.M.
VECTOR #2 (1-Sec)……….28 W @ 12:10 A.M.
DAVIS #1……………….26 W @ 12:08 A.M.
DAVIS #2 ………………29 W @ 12:10 A.M.
RMY #1 (Instantaneous)…..29 WSW @ 12:51 A.M.
RMY #2 (Instantaneous)…..29 W @ 12:10 A.M.
MERLIN…………………27 WSW
RICHARDS (C5C) (Inst)……30 @ 12:49 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………20 W @ 12:15 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20 @ 12:15 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19 @ 12:49 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………21 WSW @ 12:15 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 WSW @ 12:50 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 WSW @ 12:50 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 WSW @ 12:50 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………19 @ 12:50 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……11.0 SW [264 total miles]
VECTOR #1…………….11.3
VECTOR #2…………….11.4
DAVIS #1……………..10.9 SW
DAVIS #2……………..11.4 SW
RMY #1……………….11.1 SW
RMY #2……………….11.5 SW
RICHARDS (C5C)………..10.9
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..4.32 DEPARTURE…..-0.15
TOTAL PRECIPITATION FOR THE YEAR (2024)…….24.37 DEPARTURE…..+5.88
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……-2.1
TOTAL SNOWFALL FOR THE SEASON (2023-2024)……26.8 DEPARTURE…..-42.9
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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/+7/1.03/0.0/032/04 62 SSE VEC1 62 S RMY 63
4/13 54/43/49/+3/T/0.0/271/34 43 W VEC1 42 WNW RMY 46
4/14 58/42/50/+3/0.09/0.0/384/48 33 WSW VEC1 33 WSW RMY 35
4/15 73/43/58/+11/T/0.0/764/95 33 NW VEC1 33 NW RMY 34
4/16 68/44/56/+9/0.00/0.0/759/94 29 NW VEC1 28 NW RMY 29
4/17 60/40/50/+2/0.00/0.0/656/81 25 ESE VEC1 24 ESE RMY 24
4/18 47/40/44/-4/0.21/0.0/000/00 25 E VEC1 25 E RMY 23
4/19 60/41/51/+2/T/0.0/399/49 29 S VEC1 29 S RMY 29
4/20 57/40/49/0/0.38/0.0/082/10 34 WNW VEC1 37 WNW RMY 39
4/21 50/34/42/-8/0.00/0.0/295/36 30 NW VEC1 30 WNW RMY 31
4/22 57/34/46/-4/0.00/0.0/822/100 29 NW VEC1 29 NW RMY 29
4/23 63/37/50/0/0.00/0.0/710/86 30 S VEC1 29 S RMY 29
4/24 63/33/48/-3/0.04/0.0/265/32 52 WNW VEC1 51 WNW RMY 58
4/25 55/29/42/-9/0.00/0.0/831/100 28 SE VEC1 28 SE RMY 26
4/26 56/32/44/-8/0.00/0.0/…/.. 25 S VEC1 24 S RMY 24
4/27 66/37/52/0/0.00/0.0/…/.. 26 SW VEC1 27 SW RMY 27
4/28 67/41/54/+2/0.02/0.0/…/.. 28 WSW VEC1 27 WSW RMY 29
4/29 The low since midnight is 58F, the daily normal low is 43F.
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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 29
HIGH 85 IN 1974
LOW 26 IN 1909
PRECIP 1.65 IN 1923
SNOWFALL 1.0 IN. IN 1987
PEAK GUST 55 MPH WNW IN 2010
RECORDS FOR APRIL 30
HIGH 86 IN 1942
LOW 30 IN 1931
PRECIP 1.41 IN 1991
SNOWFALL 0.3 IN. IN 1909
PEAK GUST 64e MPH NW IN 1978
TODAY’S REPORT PREPARED BY: Matt Douglas
