Tuesday, April 30, 2024
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, APRIL 30, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0440E
SUNSET: 1843E
OVERCAST SKIES AND COOLER TODAY FOLLOWING EARLY MORNING
THUNDERSTORMS….
An area of thunderstorms moved through the region early this
morning bringing Blue Hill its first thunderstorm day of the
year. Rainfall for the “event” totaled 0.58″, 0.30″ of which
fell within 1 hour between 4-5am. The activity moved out by
the 7am observation, and skies have been cloudy since, although
they have been thinning a bit in the last hour or so.
Temperatures are much cooler than yesterday with readings
only reaching the mid to upper 50s so far. This is due largely
to the lack of sunshine as well as the onshore flow.
The wind has generally been on the light side, but occasionally
does get a little gusty. The average speed has been around
8mph for the day so far, again mainly out of an easterly
direction, but it has become more southerly in the last hour
or so. The peak gust for the day so far is 23mph, which occurred
just after 12:30pm.
Visibility has been gradually improving as the day progresses,
from around 30 miles early this morning to around 50 miles by
early this afternoon.
The maximum temperature so far today is 58F degrees, which is
5 degrees below the normal high of 63F. The minimum temperature
since midnight is 47F degrees, which is 4 degrees above the
normal low of 43F.
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Today’s Observations:
7 A.M.
Weather: Broken stratocumulus, overcast altostratus, few
stratus fractus all quadrants
Temperature: 48F; Dew Point: 46F; Relative Humidity: 93%
Wind: E @ 9 kts
Sea-level pressure: 1018.8 mb; 30.09 in. Hg: rising unsteadily
Visibility: 30 miles, thin fog
6-hr Max temp: 53F
6-hr Min temp: 47F
24-hr Precip: 0.58 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 E45 BKN 90 OVC 30 188/48/46/1009/009/ FEW STFRA ALQDS
THN F ALQDS RW-E29/ 8/72/ 52007 6058/ 70058 10053 20047
10 A.M.
Weather: Scattered stratocumulus, overcast altocumulus/altostratus
Temperature: 51F; Dew Point: 48F; Relative Humidity: 89%
Wind: ENE @ 3 kts, wind light
Sea-level pressure: 1019.1 mb; 30.09 in. Hg: falling, then rising
Visibility: 40 miles, thin fog
3-hr Precip: 0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 15 SCT 50 OVC 40 191/51/48/0603/009/ THN F ALQDS WND LGT/
8/57/ 53003
1 P.M.
Weather: Broken stratocumulus, broken cirrostratus, overcast cirrus,
few breaks in overcast overhead-NE-E, few cumulus distant SW-NW-NNE
Temperature: 58F; Dew Point: 45F; Relative Humidity: 62%
Wind: S @ 7G18 kts
Sea-level pressure: 1016.1 mb; 30.01 in. Hg: falling, then more rapidly
Visibility: 50 miles, hazy
6-hr Max temp: 58F
6-hr Min temp: 58F
6-hr Precip: 0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 E35 BKN 200 BKN 250 OVC 50 161/58/45/1807G18/001/
FEW BINOVC OVHD-NE-E FEW CU DSNT SW-NW-NNE SUN DMLY VSBL HAZY/
8/806 58030 10058 20048
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SUMMARY FOR MONDAY, APRIL 29, 2024
TEMPERATURE (DEGREES F)
MAX…….70 NORMAL…..62
MIN…….53 NORMAL…..43
MEAN……62 NORMAL…..53
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+9
TOTAL DEPARTURE FOR THE MONTH……………………+20 [+0.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….3 DEPARTURE…….-10
TOTAL HEATING UNITS FOR THE MONTH…………..514 DEPARTURE…….-14
TOTAL HEATING UNITS FOR THE SEASON…………5155 DEPARTURE……-720
TOTAL HEATING UNITS LAST SEASON TO DATE…….4958 DEPARTURE……+197
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)……….E26 ENE @ 09:22 A.M.
VECTOR #1 (1-Sec)……….25 ENE @ 09:20 A.M.
VECTOR #2 (1-Sec)……….24 NNW @ 07:27 A.M.
DAVIS #1……………….24 ENE @ 09:21 A.M.
DAVIS #2 ………………22 N @ 08:55 A.M.
RMY #1 (Instantaneous)…..27 NNW @ 08:28 A.M.
RMY #2 (Instantaneous)…..25 NNW @ 08:33 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)……23 @ 08:35 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 ENE @ 10:10 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17 @ 09:21 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18 @ 09:21 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 ENE @ 09:22 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 ENE @ 09:21 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 ENE @ 09:21 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 ENE @ 09:21 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………17 @ 09:21 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….8.9 NNW [214 total miles]
VECTOR #1……………..9.1
VECTOR #2……………..9.4
DAVIS #1………………9.3 NE
DAVIS #2………………9.3 NE
RMY #1………………..9.0 ENE
RMY #2………………..9.4 ENE
RICHARDS (C5C)…………9.5
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.58 DEPARTURE…..+0.44
TOTAL PRECIPITATION FOR THE MONTH…………..4.90 DEPARTURE…..+0.29
TOTAL PRECIPITATION FOR THE YEAR (2024)…….24.95 DEPARTURE…..+6.32
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0
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/-8/0.00/0.0/833/100 25 S VEC1 24 S RMY 24
4/27 66/37/52/0/0.00/0.0/627/75 26 SW VEC1 27 SW RMY 27
4/28 67/41/54/+2/0.02/0.0/385/46 28 WSW VEC1 27 WSW RMY 29
4/29 70/53/62/+9/0.00/0.0/446/53 26 ENE VEC1 25 ENE RMY 27
4/30 The low since midnight is 47F, 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 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
RECORDS FOR MAY 1
HIGH 87F IN 1899
LOW 29F IN 1978
PRECIP 2.53 INCHES IN 1921
SNOWFALL TRACE IN 1905,1917,1921,1995,2016
PEAK GUST 57 MPH NW IN 1974
TODAY’S REPORT PREPARED BY: Matt Douglas
