Saturday, April 15, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, APRIL 15, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
BEAUTIFUL DAY AT GREAT BLUE HILL
It has been a beautiful day at the Blue Hill Observatory with
sunny skies and warm temperatures. Temperatures rose 28F from a
minimum of 40F this morning to 68F just before the 1:00 P.M. EST
observation. The air became very dry, with relative humidity
decreasing from 75% at 7:00 A.M. down into the low 20%s by 10:00 A.M.
Despite the dry air, distant haze lingered in the area all day.
The sun has been shining, but more cirrus clouds have slowly been
moving in. Wind has been increasing from out of the SW direction.
The peak gust measured before 1:00 P.M. was 30 MPH at 12:08 P.M.
Pressure began falling late this morning because of a low pressure
system approaching the area.
Today’s Observations:
7 A.M.
Weather: Clear, few cirrus in all directions
Temperature: 45F; Dew Point: 38F; Wind: SW at 12G20 kts
Sea-level pressure: 30.37 ins. Hg, steady, then rising
Visibility: 70 miles, distant haze in all directions
6-hr Max temp: 45F
6-hr Min temp: 40F
24-hr precip: 0.00 in.
24-hr snowfall: 0.0 in.
BHO SA 1155 CLR 70 286/45/38/2206/037/ FEW CI ALQDS DSNT HZ ALQDS/
8/001 53006 10045 20040
10 A.M.
Weather: Scattered cirrus
Temperature: 61F; Dew Point: 24F; Wind: WSW at 12G20 kts,
Sea-level pressure: 30.35 ins. Hg, falling, then more quickly
Visibility: 70 miles, distant haze in all directions
BHO SA 1455 250 SCT 70 277/61/24/2512G20/035/ DSNT HZ ALQDS/
8/001 58009
1 P.M.
Weather: Scattered cirrus
Temperature: 67F; Dew Point: 30F; Wind: SSW at 15G24 kts,
Peak Wind: 26 kts (30 MPH) SSW at 12:08 A.M. EST
Sea-level pressure: 30.28 ins. Hg, falling, then more quickly
Visibility: 70 miles, distant haze in all directions
6-hr Max temp: 68F
6-hr Min temp: 45F
BHO SA 1755 250 SCT 70 255/67/30/2115G24/028/ DSNT HZ ALQDS
PK WND 2126/08/ 8/001 56002 10068 20045
SUMMARY FOR FRIDAY, APRIL 14, 2017
TEMPERATURE (DEGREES F)
MAX…..61 NORMAL…..55
MIN…..40 NORMAL…..37
MEAN….51 NORMAL…..46
DEPARTURE FROM 30-YEAR NORMAL…………………….+5
TOTAL DEPARTURE FOR THE MONTH……………………+60 [+4.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..14 DEPARTURE……….+5
TOTAL HEATING UNITS FOR THE MONTH………….243 DEPARTURE………-57
TOTAL HEATING UNITS FOR THE SEASON………..5145 DEPARTURE……..-639
TOTAL HEATING UNITS LAST SEASON TO DATE……4759 DIFFERENCE…….+386
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL HEATING UNITS FOR YESTERDAY……………0 DEPARTURE………..0
TOTAL HEATING UNITS FOR THE MONTH……………3 DEPARTURE……….+3
TOTAL HEATING UNITS FOR THE SEASON…………..3 DEPARTURE……….+3
TOTAL HEATING UNITS LAST SEASON TO DATE………0 DIFFERENCE………+3
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….22 NNW AT 12:00 P.M.
AERO……………………22 NNW AT 12:00 P.M.
ASOS……………………23 NW AT 12:31 P.M.
DAVIS…………………..21 NNW AT 11:59 A.M. RMY 24
FASTEST MILE FOR YESTERDAY…………………16 NW AT 11:57 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17 NW AT 12:31 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16 NNW AT 12:01 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.0 NW
ASOS…………………..9.4
DAVIS………………….7.7 N [350 deg.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….4.27 DEPARTURE……+1.91
ASOS…………..4.28
TOTAL PRECIPITATION FOR THE YEAR……….18.39 DEPARTURE……+2.03
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0 DEPARTURE…….-0.1
TOTAL SNOWFALL FOR THE MONTH…………….2.7 DEPARTURE…….+0.6
TOTAL SNOWFALL FOR THE SEASON…………..66.4 DEPARTURE…….+4.6
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
4/1 35/31/33/-8/2.21/2.7/000/00 40 ENE AERO 41 ENE RMY 41
4/2 53/30/42/+1/0.00/0.0/…/.. 32 NW AERO 33 NW RMY 34
4/3 60/35/48/+6/0.00/0.0/…/.. 21 W* AERO 20 NW RMY N/A
4/4 42/35/39/-3/0.78/0.0/…/.. 41 ESE AERO 43 ESE RMY 42
4/5 41/35/38/-5/0.00/0.0/000/00 21 NNW AERO 20 NNW RMY N/A
4/6 55/35/45/+2/1.27/0.0/000/00 35 SSE AERO 37 S RMY 37 TSTM
4/7 53/38/46/+3/0.00/0.0/…/.. 43 SSW AERO 47 SSW RMY 48
4/8 50/34/42/-2/0.00/0.0/…/.. 37 WNW AERO 40 WNW RMY 39
4/9 65/34/50/+6/0.00/0.0/…/.. 23 W AERO 23 W RMY N/A
4/10 77/45/61/+16/0.00/0.0/…/.. 37 S AERO 37 S RMY 39
4/11 85/50/68/+23/0.00/0.0/…/.. 28 S AERO 28 S RMY 30
4/12 68/47/58/+13/0.01/0.0/…/.. 26 WNW AERO 28 WNW RMY N/A
4/13 58/40/49/+3/0.00/0.0/…/.. 28 WNW AERO 31 NW RMY 30
4/14 62/40/51/+5/0.00/0.0/…/.. 22 NNW AERO 22 NNW RMY 24
4/15 Low temp since midnight is 40F; normal low is now 38F
DAILY RECORDS FOR APRIL 2017
4/11/17: DAILY RECORD MAXIMUM TEMPERATURE OF 85F,
BREAKS PREVIOUS RECORD OF 78F SET IN 1945
4/11/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 50F,
TIES WITH PREVIOUS RECORD SET IN 1955
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR APRIL 15
HIGH 81 IN 1896
LOW 23 IN 1943
PRECIP 1.75 IN. IN 2007
SNOWFALL 1.0 IN. IN 1916, 1962
PEAK GUST 66 MPH E IN 2007
RECORDS FOR APRIL 16
HIGH 89 IN 2012
LOW 23 IN 1943
PRECIP 2.45 IN. IN 1929
SNOWFALL 2.0 IN. IN 1904, 1962
PEAK GUST 73 MPH E IN 2007
TODAY’S REPORT PREPARED BY: Lizzy Suzedell
