Wednesday, October 16, 2024

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

WEDNESDAY, OCTOBER 16, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0559E
SUNSET:  1700E

THE CHILLY AIR MASS REMAINS UNDER A MIX OF SUN AND CLOUDS….

A mix of sun and clouds has been the theme today with mid and upper
level clouds early this morning being replaced by low level diurnal
clouds by late morning into the afternoon.

The temperature is once again below normal today with readings
starting the day in the mid to upper 30s. They have only recovered
to the low to mid 50s early this afternoon, which is once again
below normal for the date. Dew point readings have been holding in
the mid 30s all day.

The wind has been busy again today with west-northwest to northwest
breeze averaging around 15mph for the day so far. Frequent gusts
continue to exceed 20mph throughout the day, with a peak gust thus
far of 32mph occurring just before 11:30am.

Visibility has excellent all day, holding at around 70-80 miles.

The maximum temperature so far today is 54F, which is 7 degrees
below the normal high of 61F. The minimum temperature since midnight
is 38F, which is 6 degrees below the normal low of 44F.

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Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, scattered cirrus, few stratocumulus
distant WNW-NNW and offshore distant NNE-SE-SSW
Temperature: 40F; Dew Point: 35F; Relative Humidity: 82%
Wind: W @ 12G18 kts
Sea-level pressure: 1011.9 mb; 29.88 in. Hg: rising steadily
Visibility: 70 miles
6-hr Max temp: 40F
6-hr Min temp: 38F
24-hr Precip:  0.00 inches
BHO SA 1155 150 SCT 250 SCT 70 119/40/35/2812G18/988/ FEW SC DSNT
WNW-NNW AND OFFSHR DSNT NNE-SE-SSW/ 8/551 52020 10040 20038

10 A.M.
Weather: Scattered stratocumulus
Temperature: 50F; Dew Point: 35F; Relative Humidity: 55%
Wind: WNW @ 12G19 kts
Sea-level pressure: 1014.2 mb; 29.95 in. Hg: rising, then more rapidly
Visibility: 80 miles
3-hr Precip: 0.00 inches
BHO SA 1455 35 SCT 80 142/50/35/3012G19/995/ 8/500 53023

1 P.M.
Weather: Broken stratocumulus
Temperature: 53F; Dew Point: 36F; Relative Humidity: 53%
Wind: NW @ 14G23 kts, peak wind NW 31mph at 12:27 P.M.
Sea-level pressure: 1015.3 mb; 29.98 in. Hg: rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 54F
6-hr Min temp: 40F
6-hr Precip: 0.00 inches
BHO SA 1755 E40 BKN 80 153/53/36/3114G23/998/ PK WND 3227/27/
8/500 51011 10054 20040

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SUMMARY FOR TUESDAY, OCTOBER 15, 2024

TEMPERATURE (DEGREES F)
MAX…….55  NORMAL…..61
MIN…….35  NORMAL…..44
MEAN……45  NORMAL…..53

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..-8
TOTAL DEPARTURE FOR THE MONTH………………………0 [-0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY……………20  DEPARTURE……..+8
TOTAL HEATING UNITS FOR THE MONTH…………..143  DEPARTURE……..-6
TOTAL HEATING UNITS FOR THE SEASON………….213  DEPARTURE…….-54
TOTAL HEATING UNITS LAST SEASON TO DATE……..192  DEPARTURE…….+21

COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….0  DEPARTURE……..-6
TOTAL COOLING UNITS FOR THE SEASON………….757  DEPARTURE…….+81
TOTAL COOLING UNITS LAST SEASON TO DATE……..704  DEPARTURE…….+53

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)……….E31 W    @   03:53 P.M.
VECTOR #1 (1-Sec)……….30 WNW  @   02:54 P.M.
VECTOR #2 (1-Sec)……….33 WNW  @   02:54 P.M.
DAVIS #1……………….31 W    @   03:53 P.M.
DAVIS #2 ………………33 WNW  @   02:54 P.M.
RMY #1 (Instantaneous)…..31 WNW  @   03:15 P.M.
RMY #2 (Instantaneous)…..33 WNW  @   02:54 P.M.
MERLIN…………………29 NW
RICHARDS (C5C) (Inst)…..OTS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………22 W    @   08:19 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..20      @   02:54 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23      @   03:54 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 W    @   08:25 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 WNW  @   03:54 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..19 WNW  @   02:35 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 W    @   03:54 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….13.5 WNW  [323 total miles] VECTOR #1……………..13.1
VECTOR #2……………..13.7
DAVIS #1………………13.7 W
DAVIS #2………………13.6 WNW
RMY #1………………..12.4 W
RMY #2………………..13.4 W
RICHARDS (C5C)………….OTS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE MONTH…………..0.53 DEPARTURE…..-1.85
TOTAL PRECIPITATION FOR THE YEAR (2024)…….43.57 DEPARTURE…..+2.52

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PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

10/1   66/55/61/+3/T/134/19               28 ENE VEC1 28 ENE RMY 29
10/2   66/52/59/+1/T/252/36               21 ENE VEC1 20 ENE RMY 20
10/3   72/52/62/+5/0.00/592/85            23 S   VEC1 23 S   RMY 23
10/4   74/54/64/+7/0.00/438/63            23 SW  VEC1 22 SW  RMY 22
10/5   72/52/62/+5/T/457/66               24 NNW VEC1 23 NNW RMY 24
10/6   65/47/56/0/0.00/655/95             20 SE  VEC1 19 SE  RMY 18
10/7   60/51/56/0/0.27/021/03             29 SSE VEC1 29 SSE RMY 31
10/8   64/45/55/0/0.00/649/95             21 NW  VEC1 21 NW  RMY 21
10/9   64/46/55/0/T/632/93                24 W   VEC1 23 WNW RMY 23
10/10  60/42/51/-4/0.00/…/..            36 NW  VEC1 36 NW  RMY 38
10/11  67/40/54/0/0.00/…/..             28 WSW VEC1 27 WSW RMY 27
10/12  71/48/60/+6/0.00/…/..            44 NW  VEC1 43 NW  RMY 45
10/13  50/44/47/-7/0.20/…/..            32 ENE VEC1 32 ENE RMY 30
10/14  51/38/45/-8/0.06/…/..            35 NW  VEC1 34 WNW RMY 36
10/15  55/35/45/-8/0.00/…/..            31 W   VEC1 30 WNW RMY 31

10/16  The low since midnight is 38F, the daily normal low is 44F.

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OCTOBER DAILY RECORDS TO DATE

NONE.

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

RECORDS FOR OCTOBER 16
HIGH 86F IN 1897
LOW 28F IN 1886
PRECIP 2.82 INCHES IN 1974
SNOWFALL TRACE IN 2009
PEAK GUST 68e MPH SSE IN 1954 (HURRICANE HAZEL)

RECORDS FOR OCTOBER 17
HIGH 86F IN 1947
LOW 25F IN 1886
PRECIP 1.87 INCHES IN 1989
SNOWFALL TRACE IN 1970
PEAK GUST 61 MPH E IN 2019

TODAY’S REPORT PREPARED BY: Matt Douglas