Friday, April 9, 2021
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, APRIL 9, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0513E
SUNSET: 1819E
A SPRING STUNNER ATOP GREAT BLUE HILL…
Plentiful sunshine abounds across the region today.
With skies mainly clear, we are once again experiencing
another sun-filled day. The volume of bright weather over
the past month has certainly been one to enjoy.
Temperature have also reached the mid-60s making it feel
great out there!
To go along with the mild temperatures is the lack of
wind, thanks to the center of high pressure passing directly
overhead. Winds were calm at 7AM and have only
averaged 3 MPH since then! This has made the temperatures
feel a bit warmer than the mid-60s.
Rainfall deficit for the year is currently -4.28 inches,
leaving us with an “abnormally dry” rating on the
drought monitor map. We can certainly use the rain prior
to entering the hot summer months. Next chance of
precipitation for the area appears to be this coming Sunday.
However, forecast models appear to be having difficulty
honing in on the quantity of rainfall.
The high today so far today is 67F, this is 14 degrees above
the normal high of 53F. The low since midnight is 42F, which
is 7 degrees above the daily normal low of 35F.
Today’s Observations:
7 A.M.
Weather: Clear (few cirrus, thin smoke layer NW-NE)
Temperature: 52F; Dew Point: 43F; Relative Humidity: 70%
Wind: Calm
Sea-level pressure: 30.19 in Hg, rising unsteadily
Visibility: 75 miles
6-hr Max temp: 52F
6-hr Min temp: 42F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 CLR 75 225/52/43/0000/019/ FEW CI ALQDS
THN K LYR NW-NE WND CALM/ 8/001 52010 10052 20042
10 A.M.
Weather: Clear (few cirrus WSW-SE, thin smoke layer WNW-NE)
Temperature: 60F; Dew Point: 43F; Relative Humidity: 53%
Wind: S @ 4 kts (wind light and variable)
Sea-level pressure: 30.21 in Hg; rising, then falling
Visibility: 75 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 CLR 75 230/60/43/1804/021/ FEW CI DSNT WSW-SE
THN K LYR WNW-NE WND L/V/ 8/001 50005
1 P.M.
Weather: Scattered Cirrus (few cumulus; thin smoke layer NW-NE)
Temperature: 66F, Dew point: 44F; Relative Humidity: 44%
Wind: S @ 4 kts (wind light and variable)
Sea-level pressure: 30.15 in Hg; falling steadily
Visibility: 75 miles
6-hr Max temp: 67F
6-hr Min temp: 52F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 250 SCT 75 210/66/44/1803/015/ FEW CU ALQDS
THN K LYR NW-NE WND L/V/ 8/101 57020 10067 20052
SUMMARY FOR THURSDAY, APRIL 8, 2021
TEMPERATURE (DEGREES F)
MAX…….59 NORMAL…..52
MIN…….43 NORMAL…..35
MEAN……51 NORMAL…..44
DEPARTURE FROM 30-YEAR (1981-2010) NORMAL……. +7
TOTAL DEPARTURE FOR THE MONTH……………….+17 [+1.9 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………14 DEPARTURE…….-7
TOTAL HEATING UNITS FOR THE MONTH…………..164 DEPARTURE……-17
TOTAL HEATING UNITS FOR THE SEASON…………4986 DEPARTURE…..-679
TOTAL HEATING UNITS LAST SEASON TO DATE…….5040 DEPARTURE……-54
PEAK WIND GUST (MPH):
420C/Official…………..22 ENE @ 1:19 P.M.
AEROVANE (south tower)…..22 ENE @ 11:08 A.M.
ASOS…………………..24 E @ 1:19 P.M.
DAVIS #1……………….21 E @ 11:42 A.M.
DAVIS #2 (south tower)…..21 E @ 11:42 A.M.
RMY……………………24 @ 1:19 P.M.
VECTOR…………………26 @ 1:19 P.M.
MERLIN…………………22
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………17 ENE @ 1:21 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 ENE @ 1:20 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………17 ENE @ 1:21 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 ENE @ 1:21 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..16 ESE @ 1:20 P.M.
MAXIMUM 2-MINUTE VECTOR AVERAGE……………..16 @ 1:18 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..9.3 ENE [223 total miles] ASOS…………………..9.7
DAVIS #1……………….9.8 ENE
DAVIS #2……………….9.8 ENE
RMY……………………9.3 E
VECTOR…………………9.7
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00 DEPARTURE….-0.17
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….0.89 DEPARTURE….-0.46
ASOS………….0.87
TOTAL PRECIPITATION FOR THE YEAR………….11.06 DEPARTURE….-4.28
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…..-1.4
TOTAL SNOWFALL FOR THE SEASON……………..72.6 DEPARTURE….+12.0
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 The low since midnight is 42F, the daily normal low is 35F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR APRIL 9
HIGH 83 IN 1991
LOW 18 IN 1888
PRECIP 2.38 IN. IN 1935
SNOWFALL 11.0 IN. IN 1917
PEAK GUST 72 MPH WNW IN 1962
RECORDS FOR APRIL 10
HIGH 83 IN 1922
LOW 20 IN 1985
PRECIP 2.40 IN. IN 1935
SNOWFALL 10.1 IN. IN 1996
PEAK GUST 66 MPH WNW IN 1967
TODAY’S REPORT PREPARED BY: Andrew Swanson
