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Sunday, December 8, 2024

December 8, 2024

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SUNDAY, DECEMBER 8, 2024 ALL TIMES ARE…

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

SUNDAY, DECEMBER 8, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0701E
SUNSET:  1611E

A COATING OF SNOW IN THE OVERNIGHT HOURS FOLLOWED BY WARMING
AND SUNSHINE TODAY….

There was an Alberta Clipper system that passed over our region
last night and into the early morning hours, bringing Blue Hill
a trace of snow that netted us 0.02 liquid equivalence.
This morning we were still under overcast skies which eventually
cleared up by the early afternoon. The sunshine and more moist
air has brought some warming, which has been welcome after the
past few frigid days.

We started the day with a temperature of 37F which was the maximum
temperature yesterday. With the sun came some gradual warming and
as of the final 1pm observation we were up to 47F. Temperatures have
went from well below normal to slightly above normal in the past
24 hours. Even with the dry air and breezy conditions, it feels so
much more comfortable out there today.

Westerly flow was dominant yesterday and not much has changed in
that regard, other than a slight shift to the SSW and WSW for much
of the day. Winds have been a bit more active today, averaging around
16 mph with some gusts in the low 20’s. Our peak gust for the day
so far occurred overnight at 3:54am with a speed of 37 mph.

We have struggled with visibility, even with the early afternoon
clearing. Visibility has ranged between 30-40 miles today.

The maximum temperature for today is 47F degrees, which is 5 degrees
above the normal high of 42F. The minimum temperature since midnight
is 28F degrees, which is 1 degree above the normal low of 27F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Overcast altocumulus, few stratocumulus all quadrants
Temperature: 36F; Dew Point: 29F; Relative Humidity: 74%
Wind: SW @ 12G18 kts
Sea-level pressure: 1006.0 mb; 29.71 in. Hg: falling, then more
slowly
Visibility: 30 miles
6-hr Max temp: 36F
6-hr Min temp: 28F
24-hr Precip:  0.02 inches
24-hr Snowfall: Trace
Snow Depth: 1 inch
BHO SA 1155 E100 OVC 30 060/36/29/2212G18/971/ FEW SC ALQDS TOTAL
NEW SNW PST 24 HRS TRACE/ 8/56/ 4/001 56035 6002/ 70002 10036 20028

10 A.M.
Weather: Broken altocumulus, broken altostratus
Temperature: 40F; Dew Point: 27F; Relative Humidity: 56%
Wind: WSW @ 12 kts
Sea-level pressure: 1006.1 mb; 29.71 in. Hg: falling, then rising
Visibility: 40 miles
3-hr Precip:  0.00 inches
3-hr Snowfall: 0.0 inches
BHO SA 1455 E70 BKN 100 BKN 40 061/40/27/2412/971/ 8/07/ 53001

1 P.M.
Weather: Scattered altocumulus, scattered cirrus
Temperature: 47F; Dew Point: 27F; Relative Humidity: 45%
Wind: W @ 11 kts
Sea-level pressure: 1016.7 mb; 30.02 in. Hg: falling, then steady
Visibility: 30 miles
6-hr Max temp: 47F
6-hr Min temp: 36F
6-hr Precip:  0.00 inches
6-hr Snowfall: 0.0 inches
Snow Depth: 1 inch
BHO SA 1755 100 SCT 250 SCT 30 050/47/27/2711/968/ 8/051 4/001
56011 10047 20036

————————————————————–

SUMMARY FOR SATURDAY, DECEMBER 7, 2024

TEMPERATURE (DEGREES F)
MAX…….37  NORMAL…..43
MIN…….22  NORMAL…..27
MEAN……30  NORMAL…..35

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..-5
TOTAL DEPARTURE FOR THE MONTH…………………….-42 [-5.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………35  DEPARTURE……..+5
TOTAL HEATING UNITS FOR THE MONTH…………..245  DEPARTURE…….+41
TOTAL HEATING UNITS FOR THE SEASON…………1188  DEPARTURE……-219
TOTAL HEATING UNITS LAST SEASON TO DATE…….1281  DEPARTURE…….-93

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated

F420C (Official)………..25 S    @   11:27 P.M.
VECTOR #1 (1-Sec)……….25 S    @   11:27 P.M.
VECTOR #2 (1-Sec)……….25 W    @   03:52 P.M.
DAVIS #1……………….30 S    @   11:27 P.M.
DAVIS #2 ………………27 S    @   11:27 P.M.
RMY #1 (Instantaneous)…..26 S    @   11:27 P.M.
RMY #2 (Instantaneous)…..26 W    @   03:52 P.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………18 W    @   12:36 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17      @   11:20 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18      @   12:36 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 W    @   12:37 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 W    @   12:36 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 SSW  @   11:20 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 W    @   12:36 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.5 W  [252 total miles] VECTOR #1………………10.7
VECTOR #2………………11.0
DAVIS #1……………….11.0 WSW
DAVIS #2……………….11.2 W
RMY #1…………………10.3 WSW
RMY #2…………………10.9 WSW
RICHARDS (C5C)…………..OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.02 DEPARTURE…..-0.16
TOTAL PRECIPITATION FOR THE MONTH…………..0.55 DEPARTURE…..-0.70
TOTAL PRECIPITATION FOR THE YEAR (2024)…….48.02 DEPARTURE…..-1.70

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………TRACE DEPARTURE……-0.3
TOTAL SNOWFALL FOR THE MONTH………………..3.0 DEPARTURE……+1.2
TOTAL SNOWFALL FOR THE SEASON (2024-2025)…….3.0 DEPARTURE……-1.3

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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

12/1   37/23/30/-7/0.00/0.0/452/81        21 WSW VEC1 21 WSW RMY 21
12/2   38/22/30/-7/0.00/0.0/551/99        18 W   VEC1 18 W   RMY 18
12/3   36/20/28/-8/0.00/0.0/411/74        21 NW  VEC1 21 WNW RMY 21
12/4   39/22/31/-5/0.13/T/394/71          30 S   VEC1 31 S   RMY 33
12/5   37/31/34/-2/0.40/3.0/…/..        43 WNW VEC1 43 WNW RMY 47
12/6   31/23/27/-8/0.00/0.0/…/..        39 NW  VEC1 39 W   RMY 42
12/7   37/22/30/-5/0.00/T/…/..          25 S   VEC1 25 S   RMY 26

12/8 The low since midnight is 28F, the daily normal low is 27F.

————————————————————–

DECEMBER DAILY RECORDS TO DATE

NONE.

————————————————————–

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR DECEMBER 8
HIGH 62 IN 1966
LOW -4 IN 1906
PRECIP 1.54 INS. IN 1969
SNOWFALL 2.5 INS. IN 2001
PEAK GUST 78e W IN 1979

RECORDS FOR DECEMBER 9
HIGH 68 IN 1966
LOW -14 IN 1902
PRECIP 3.23 INS. IN 2014
SNOWFALL 10.8 INS. IN 2005
PEAK GUST 66 SE IN 1973

TODAY’S REPORT PREPARED BY: Amanda Joly

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