Sunday, April 11, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SUNDAY, APRIL 11, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0510E
SUNSET: 1821E
FOGGY WITH INCREASING WIND ATOP GREAT BLUE HILL….
Today consisted of fog with a maximum visibility of
6 miles and an average visibility of less than an
1/8th mile. Wind has increased since this morning,
reaching a peak gust higher than 30 mph following
noontime. This northeasterly breeze is keeping
temperatures on the lower side in comparison to
yesterday, where the max temperature was 75F.
The high so far today is 45F, this is 9 degrees below
the normal high of 54F. The low since midnight is 42F,
which is 6 degrees above the daily normal low of 36F.
Today’s Observations:
7 A.M.
Weather: Fog
Temperature: 43F; Dew Point: 43F; Relative Humidity: 100%
Wind: NNE at 15G20 kts
Sea-level pressure: 29.76 in Hg, falling then rising
Visibility: 1/16th mile, fog
6-hr Max temp: 52F
6-hr Min temp: 43F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 X W3 1/16F 079/43/43/0315G20/976/ 8////
50014 10052 20043
10 A.M.
Weather: Overcast stratus
Temperature: 44F; Dew Point: 42F; Relative Humidity: 93%
Wind: NNE @ 10G22 kts
Sea-level pressure: 29.77 in Hg; falling then rising
Visibility: 6 miles, fog
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 OVC 10 6F 081/44/42/0310G22/977/ 8/6// 50002
1 P.M.
Weather: Broken cumulus and cirrostratus
Temperature: 72F, Dew point: 50F; Relative Humidity: 46%
Wind: WSW @ 7 kts
Sea-level pressure: 29.89 in Hg; falling steadily
Visibility: 65 miles
6-hr Max temp: 74F
6-hr Min temp: 48F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
SUMMARY FOR SATURDAY, APRIL 10, 2021
TEMPERATURE (DEGREES F)
MAX…….75 NORMAL…..53
MIN…….43 NORMAL…..36
MEAN……59 NORMAL…..45
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL…….+14
TOTAL DEPARTURE FOR THE MONTH……………….+43 [+4.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………….6 DEPARTURE……-14
TOTAL HEATING UNITS FOR THE MONTH…………..179 DEPARTURE……-43
TOTAL HEATING UNITS FOR THE SEASON…………4001 DEPARTURE…..-705
TOTAL HEATING UNITS LAST SEASON TO DATE…….5087 DEPARTURE……-86
PEAK WIND GUST (MPH):
420C/Official…………..26 SSW @ 6:15 P.M.
AEROVANE (south tower)…..28 SSW @ 5:36 P.M.
ASOS…………………..28 S @ 6:17 P.M.
DAVIS #1……………….27 S @ 6:13 P.M.
DAVIS #2 (south tower)…..29 S @ 5:42 P.M.
RMY……………………30 @ 6:15 P.M.
VECTOR…………………29 @ 6:12 P.M.
MERLIN…………………27
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………20 SSW @ 5:34 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 SSW @ 6:59 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………20 SSW @ 5:47 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………21 S @ 5:40 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..20 SSW @ 5:44 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..20 @ 5:43 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….11.1 SW [266 total miles] ASOS………………….11.3
DAVIS #1………………10.8 SW
DAVIS #2………………11.4 SW
RMY…………………..11.1 SW
VECTOR………………..11.6
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.18
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….0.89 DEPARTURE….-0.81
ASOS………….0.87
TOTAL PRECIPITATION FOR THE YEAR………….11.06 DEPARTURE….-4.63
ASOS………..11.38
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0 DEPARTURE…. -0.1
TOTAL SNOWFALL FOR THE MONTH …………….TRACE DEPARTURE…..-1.6
TOTAL SNOWFALL FOR THE SEASON……………..72.6 DEPARTURE….+11.8
PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY: R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data
04/01 56/30/43/+2/0.89/T/…/.. 44 NW AERO 51 NW RMY 49
04/02 37/24/31/-10/0.00/0.0/…/.. 28 NW AERO 32 NNW RMY 30
04/03 48/23/36/-6/0.00/0.0/…/.. 24 NW AERO 25 NW RMY 26
04/04 58/33/46/+4/0.00/0.0/…/.. 38 NNW AERO 41 NNW RMY 41
04/05 57/41/49/+6/T/T/…/.. 41 NNW AERO 48 NNW RMY 50
04/06 61/40/51/+8/0.00/0.0/…/.. 26 NNW AERO 25 NNW RMY 31
04/07 57/41/49/+6/0.00/0.0/…/.. 23 ENE AERO 21 ENE RMY 22
04/08 59/43/51/+7/0.00/0.0/…/.. 22 ENE AERO 22 ENE RMY 24
04/09 69/42/56/+12/0.00/0.0/…/.. 24 S AERO M M RMY 26
04/10 75/43/59/+14/0.00/0.0/…/.. 26 SSW AERO 28 SSW RMY 30
04/11 The low since midnight is 42F, the daily normal low is 36F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR APRIL 11
HIGH 85 IN 2017
LOW 19 IN 1909
PRECIP 1.72 IN. IN 2003
SNOWFALL 9.5 IN. IN 1958
PEAK GUST 65 MPH NW IN 1963
RECORDS FOR APRIL 12
HIGH 82 IN 1945
LOW 17 IN 1926
PRECIP 1.51 IN. IN 1993
SNOWFALL 9.0 IN. IN 1894
PEAK GUST 65e MPH W IN 1978
TODAY’S REPORT PREPARED BY: Benjamin Turner
