Sunday, December 10, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, DECEMBER 10, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
FIRST SNOWFALL OF THE SEASON ACCUMULATES TO
5.6 INCHES…
The first flakes of the season began falling just
after 8:00 AM yesterday morning and continued to
fall until this morning around 2:00 AM. Overall
we measured a total of 5.6 inches of snow during
this storm. The liquid equivalent precipitation
equaled 0.72 inches which means this was a very
wet watery snow. This heavy snow compacted down
to 5 inches on the ground by 7:00 AM this morning.
The sky was mostly cloudy in the morning with a broken
altocumulus layer but cleared throughout the day.
Visibility decreased from 60 miles to 40 miles by
10:00 AM due to distant haze. After yesterday’s
light wind, wind from the west started to pick up
this afternoon.
Today’s Observations:
7 A.M.
Weather: Scattered cumulus, broken altocumulus, few stratus
fractus WSW-NNW
Temperature: 28F; Dew Point: 25F; Wind: W at 11 kts
Sea-level pressure: 29.71 ins. Hg, rising, then more quickly
Visibility: 60 miles, distant fog in all directions
6-hr Max temp: 28F
6-hr Min temp: 27F
24-hr precip: 0.72 ins.
24-hr snowfall: 5.6 ins.
BHO SA 1155 40 SCT E120 BKN 60 062/28/25/2711/971/ FEW STFA
WSW-NNW NEW SNW PST 24 HRS 5.6 INS DSNT FG ALQDS/ 8/130 4/005
53022 MANUAL 70072 ASOS 70074 10028 20027
10 A.M.
Weather: Scattered altocumulus, scattered cirrus,
few distant cumulus off shore ENE
Temperature: 30F; Dew Point: 27F; Wind: W at 9 kts
Sea-level pressure: 29.78 ins. Hg, rising, then more quickly
Visibility: 40 miles, distant haze in all directions
3-hr precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 120 SCT E250 SCT 40 085/30/27/2709/978/ FEW CU
OFFSHR DSNT ENE DSNT FG ALQDS/ 8/131 51023
1 P.M.
Weather: Scattered cumulus
Temperature: 35F; Dew Point: 28F; Wind: WSW at 11G20 kts
Sea-level pressure: 29.79 ins. Hg, steady then falling
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 34F
6-hr Min temp: 27F
6-hr precip: 0.00 ins.
6-hr snowfall: 0.0 ins.
BHO SA 1755 35 SCT 40 088/35/28/2511G20/979/ DSNT HZ ALQDS/
8/100 4/004 50003 10034 20027
SUMMARY FOR SATURDAY, DECEMBER 9, 2017
TEMPERATURE (DEGREES F)
MAX…..34 NORMAL…..41
MIN…..28 NORMAL…..26
MEAN….31 NORMAL…..34
DEPARTURE FROM 30-YEAR NORMAL………………………-3
TOTAL DEPARTURE FOR THE MONTH……………………..+29 [+3.0 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….34 DEPARTURE……….+3
TOTAL HEATING UNITS FOR THE MONTH…………240 DEPARTURE………-29
TOTAL HEATING UNITS FOR THE SEASON……….1209 DEPARTURE……..-322
TOTAL HEATING UNITS LAST SEASON TO DATE…..1288 DIFFERENCE……..-79
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 NNW AT 10:35 P.M.
AERO……………………23 NNW AT 8:08 P.M.
ASOS……………………23 N AT 6:00 P.M.
DAVIS…………………..21 NNE AT 5:34 P.M. RMY 23
FASTEST MILE FOR YESTERDAY…………………15 NNW AT 8:23 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………16 NNW AT 9:46 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..15 N AT 8:24 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..7.0 NNW
ASOS…………………..7.6
DAVIS………………….6.6 NNW [348 DEG.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.72 DEPARTURE……+0.56
ASOS…………..0.74
TOTAL PRECIPITATION FOR THE MONTH……….1.48 DEPARTURE…….0.00
ASOS…………..1.57
TOTAL PRECIPITATION FOR THE YEAR……….51.32 DEPARTURE……+1.31
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……….5.6 DEPARTURE…….+5.2
TOTAL SNOWFALL FOR THE MONTH…………….5.6 DEPARTURE…….+2.8
TOTAL SNOWFALL FOR THE SEASON……………5.6 DEPARTURE…….+0.2
PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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
12/01 50/35/43/+6/0.04/…/.. 28 NW AERO 29 NW RMY 30
12/02 42/29/36/0/0.00/…/.. 20 NNW AERO 18 NNW RMY N/A
12/03 42/32/37/+1/0.00/…/.. 14 N AERO 10 N RMY N/A
12/04 43/32/38/+3/0.00/…/.. 16 E AERO 14 E RMY N/A
12/05 58/34/46/+11/…/…/.. 62 S AERO 66 S RMY 65
12/06 56/32/44/+9/…/…/.. 52 S AERO 55 S RMY N/A
12/07 44/30/37/+3/0.00/…/.. 25 WSW AERO 24 WSW RMY 25
12/08 38/28/33/-1/0.00/…/.. 21 W AERO 18 W RMY 20
12/09 34/28/31/-3/…/…/.. 23 NNW AERO 23 NNW RMY 23
12/10 Low temp since midnight is 28F; normal low is now 26F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR DECEMBER 10
HIGH 62 IN 1946
LOW -6 IN 1902
PRECIP 1.67 INS. IN 1907
SNOWFALL 6.0 INS. IN 1905
PEAK GUST 66e SW IN 1940
RECORDS FOR DECEMBER 11
HIGH 63 IN 1911
LOW -1 IN 1988
PRECIP 2.36 INS. IN 1992
SNOWFALL 6.0 INS. IN 1894
PEAK GUST 78 S IN 1969
TODAY’S REPORT PREPARED BY: Kaitlin Geagan
