Sunday, April 21, 2024

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

SUNDAY, APRIL 21, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0453E
SUNSET:  1833E

OVERCAST AND COOL WITH GREAT VISIBILITY….

Today we observed 80 miles of visibility on average with
overcast skies. Wind was westerly for the most part, increasing
by a few miles per hour in the afternoon. Pressure has been on
a steady drop this morning, solidifying the mid-level cloud
cover.

We received 0.37 inches of rainfall since 7 AM yesterday,
bringing our monthly total to 4.26 inches, almost an inch
above normal as we make our way through the month of April.

The maximum temperature so far today is 50F degrees, which is
9 degrees below the normal high of 59F. The minimum temperature
since midnight is 34F degrees, which is 6 degrees below the
normal low of 40F.

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Today’s Observations:

7 A.M.
Weather: Broken cirrostratus
Temperature: 41F; Dew Point: 28F; Relative Humidity: 59%
Wind: WNW @ 6 kts, wind light
Sea-level pressure: 1015.8 mb; 29.99 in. Hg: rising, then more slowly
Visibility: 85 miles
6-hr Max temp: 41F
6-hr Min temp: 34F
24-hr Precip:  0.37 inches
24-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1155 250 BKN 85 158/41/28/2906/999/ WND LGT/ 8/009 51017 70037
10041 20034

10 A.M.
Weather: Overcast altostratus with breaks W-N-NE, few stratocumulus
Temperature: 49F; Dew Point: 27F; Relative Humidity: 42%
Wind: WSW @ 8 kts
Sea-level pressure: 1014.4 mb; 29.95 in. Hg: falling, then more rapidly
Visibility: 80 miles, smoke plume to the southwest
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 110 OVC 80 144/49/27/2408/995/ FEW SC ALQDS BINOVC W-N-NE
K PLUME SW/ 8/550 58014

1 P.M.
Weather: Overcast altostratus and few stratocumulus
Temperature: 49F; Dew Point: 27F; Relative Humidity: 42%
Wind: W @ 8G14 kts
Sea-level pressure: 1012.5 mb; 29.89 in. Hg: falling unsteadily
Visibility: 80 miles
6-hr Max temp: 50F
6-hr Min temp: 41F
6-hr Precip:  0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 0 inches
BHO SA 1755 110 OVC 80 125/49/27/2708G14/989/ FEW SC ALQDS/ 8/550
56019 10050 20041

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SUMMARY FOR SATURDAY, APRIL 20, 2024

TEMPERATURE (DEGREES F)
MAX…….57   NORMAL…..59
MIN…….40   NORMAL…..40
MEAN……49   NORMAL…..49

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..0
TOTAL DEPARTURE FOR THE MONTH……………………+41 [+1.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY……………16  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………..369  DEPARTURE…….-32
TOTAL HEATING UNITS FOR THE SEASON…………5010  DEPARTURE……-738
TOTAL HEATING UNITS LAST SEASON TO DATE…….4823  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)……….E34 WNW  @  08:29 P.M.
VECTOR #1 (1-Sec)……….37 WNW  @  08:29 P.M.
VECTOR #2 (1-Sec)……….39 WNW  @  08:29 P.M.
DAVIS #1……………….36 NW   @  08:29 P.M.
DAVIS #2 ………………33 NW   @  08:29 P.M.
RMY #1 (Instantaneous)…..39 WNW  @  08:29 P.M.
RMY #2 (Instantaneous)…..40 WNW  @  08:29 P.M.
MERLIN…………………35 NW
RICHARDS (C5C) (Inst)……37      @  08:36 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………26 WNW  @  07:54 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..24      @  07:54 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..26      @  07:54 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………25 WNW  @  07:54 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 NW   @  07:54 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..26 WNW  @  08:54 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..25 WNW  @  07:53 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………24      @  07:53 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….9.3 SSW [222 total miles] VECTOR #1……………..9.5
VECTOR #2…………….10.0
DAVIS #1………………9.2 WSW
DAVIS #2………………9.7 WSW
RMY #1………………..9.3 SW
RMY #2………………..9.9 SW
RICHARDS (C5C)…………9.6

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.37 DEPARTURE…..+0.22
TOTAL PRECIPITATION FOR THE MONTH…………..4.26 DEPARTURE…..+0.95
TOTAL PRECIPITATION FOR THE YEAR (2024)…….24.31 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……-1.9
TOTAL SNOWFALL FOR THE SEASON (2023-2024)……26.8 DEPARTURE…..-42.7

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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/…/..         25 E   VEC1 25 E   RMY 23
4/19  60/41/51/+2/…/0.0/…/..          29 S   VEC1 29 S   RMY 29
4/20  57/40/49/0/…./0.0/…/..          34 WNW VEC1 37 WNW RMY 39

4/21 The low since midnight is 34F, the daily normal low is 40F.

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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 21
HIGH 85 IN 1923
LOW 22 IN 1908
PRECIP 3.18 IN. IN 1991
SNOWFALL 0.8 IN. IN 1947
PEAK GUST 76e MPH NE IN 1940

RECORDS FOR APRIL 22
HIGH 85 IN 1977, 2001
LOW 26 IN 1981
PRECIP 2.60 IN. IN 2019
SNOWFALL 3.0 IN. IN 1940
PEAK GUST 68e MPH NW IN 1945

TODAY’S REPORT PREPARED BY: Benjamin Turner