Saturday, November 21, 2020

| November 21, 2020 | Reply

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

SATURDAY, NOVEMBER 21, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

HAZE AND WARMTH PERSIST ATOP GREAT BLUE HILL…

Throw in another red square on the calendar for November!
Today’s high temperature so far is 62F with a low of just
46F. This calculates to be an average of 54F, which is more
typical of early October!

The unusual warmth has been accompanied by limited visibility-
only topping out at 45 miles. The sun has struggled to find gaps
in the cloudiness. That said, most of the sky is painted by thin
high cirrus resulting in a good deal of filtered sunshine.

With most of the month behind us, we find ourselves sitting
at +5.5F departure thus far. This is on pace for one of the
warmest Novembers on record dating back 1885. We will see how
the remainder of the month goes!

The high so far today is 62F, 14 degrees above the daily
normal high of 48F. The low since midnight 46F, 14 degrees
above the normal low of 32F. Guidance indicates, however,
that we will slip back in the 30s overnight as high pressure
approaches to our north.

Today’s Observations:
7 A.M.
Weather: Broken Altocumulus, Broken Cirrostratus
Temperature: 46F; Dew Point: 36F; Relative Humidity: 66%
Wind: W at 12 kts
Sea-level pressure: 30.24 ins. Hg, rising steadily
Visibility: 30 miles, hazy
6-hr Max temp: 51F
6-hr Min temp: 46F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 140 BKN 250 BKN 30 241/46/36/2612/024/ HAZY/
8/076 53014 10051 20046

10 A.M.
Weather: Scattered Altocumulus & Altostratus, Broken Cirrostratus
Temperature: 57F; Dew Point: 39F; Relative Humidity: 51%
Wind: W at 10 kts, gusting to 18 kts
Sea-level pressure: 30.28 ins. Hg: rising steadily
Visibility: 35 miles, hazy
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 140 SCT 250 BKN 35 253/57/39/2810G18/028/ HAZY/ 8/076
51012

1 P.M.
Weather: Scattered Altocumulus & Altostratus, Scattered Cirrus;
thin smoke layer along horizon N-SE
Temperature: 56F; Dew Point: 32F; Relative Humidity: 39%
Wind: WNW at 10 kts, gusting to 20 kts
Sea-level pressure: 30.26 ins. Hg: falling, then falling more rapidly
Visibility: 45 miles, hazy
6-hr Max temp: 62F
6-hr Min temp: 46F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 150 SCT 250 SCT 45 248/56/32/2910G20/026/ THN K LYR ALNG HRZN
N-SE HAZY/ 8/076 58005 10062 20046

SUMMARY FOR FRIDAY, NOVEMBER 20, 2020

TEMPERATURE (DEGREES F)
MAX…….63   NORMAL…..49
MIN…….44   NORMAL…..32
MEAN……54   NORMAL…..40

DEPARTURE FROM 30-YEAR NORMAL………………. +14
TOTAL DEPARTURE FOR THE MONTH……………….+114 [+5.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………11  DEPARTURE……-14
TOTAL HEATING UNITS FOR THE MONTH…………..319  DEPARTURE…..-113
TOTAL HEATING UNITS FOR THE SEASON………….771  DEPARTURE…..-224
TOTAL HEATING UNITS LAST SEASON TO DATE……..981  DEPARTURE…..-210

PEAK WIND GUST FOR YESTERDAY (MPH):
420C/Official…………..33 SSW  AT   2:06 P.M.
AEROVANE (south tower)…..35 SSW  AT   2:04 P.M.
ASOS…………………..35 SW   AT   1:50 A.M.
DAVIS #1……………….33 SW   AT  12:07 A.M.
DAVIS #2 (south tower)…..35 SW   AT   1:50 A.M.
RMY……………………37
VECTOR…………………37
MERLIN…………………33

FASTEST MILE FOR YESTERDAY:
CONTACTING/OFFICIAL………………………..29 SW   AT  12:07 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….28 SW   AT  12:07 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………27 SW   AT  12:07 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………28 SW   AT  12:07 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……17.5 SW  [421 total miles]
ASOS…………………18.2     [437 total miles]
DAVIS #1……………..17.2 WSW [413 total miles]
DAVIS #2……………..18.0 SW  [432 total miles]
RMY………………….16.9 SW  [406 total miles]
VECTOR……………….17.6     [422 total miles]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00  DEPARTURE….-0.16
ASOS………….0.00
TOTAL PRECIPITATION FOR THE MONTH………….1.74  DEPARTURE….-1.41
ASOS………….1.78
TOTAL PRECIPITATION FOR THE YEAR………….42.91  DEPARTURE….-4.01
ASOS………..43.73

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…..-0.9
TOTAL SNOWFALL FOR THE SEASON………………6.5  DEPARTURE…..+5.3

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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

11/01   49/36/43/-3/0.69/0.0/006/01      38 W     AERO 40 W    RMY 39
11/02   40/31/36/-10/T/T/425/69          61 WNW   AERO 62 WNW  RMY 62
11/03   43/29/36/-10/0.00/0.0/473/77     48 WNW   AERO 53 WNW  RMY 48
11/04   54/30/42/-3/0.00/0.0/550/90      30 SSW   AERO 30 SSW  RMY 30
11/05   69/49/59/+14/0.00/0.0/548/90     37 SSW   AERO 40 SSW  RMY 38
11/06   72/55/64/+19/0.00/0.0/394/65     28 SW    AERO 28 SW   RMY M
11/07   75/54/65/+20/0.00/0.0/562/93     21 WSW   AERO 21 WSW  RMY 21
11/08   73/54/64/+20/0.00/0.0/584/97     18 W     AERO 18 W    RMY 19
11/09   74/52/63/+19/0.00/0.0/593/99     20 WSW   AERO 18 WSW  RMY 21
11/10   74/53/64/+20/0.00/0.0/597/100    30 SW    AERO 28 SW   RMY 31
11/11   73/58/66/+23/0.04/0.0/…/..     40 SW    AERO 44 SW   RMY 45
11/12   64/46/55/+12/0.04/0.0/…/..     32 NNW   AERO 31 NNW  RMY 33
11/13   48/38/43/0/0.30/0.0/…/..       22 NW    AERO 21 NW   RMY 25
11/14   49/32/41/-1/0.00/0.0/…/..      26 NW    AERO 28 NW   RMY 29
11/15   58/30/44/+2/0.62/0.0/…/..      60 S     AERO 67 S    RMY 65
11/16   53/39/46/+4/0.00/0.0/…/..      40 WNW   AERO 41 WNW  RMY 43
11/17   47/32/40/-1/0.00/0.0/…/..      28 NW    AERO 28 NW   RMY 30
11/18   32/19/26/-15/0.00/0.0/…/..     40 NW    AERO 46 NW   RMY 43
11/19   44/18/31/-10/0.00/0.0/…/..     37 SW    AERO 39 SW   RMY 43
11/20   63/44/54/+14/0.00/0.0/…/..     33 SSW   AERO 35 SSW  RMY 37

11/21 The low since midnight is 46F, the daily normal low is 32F

DAILY RECORDS FOR NOVEMBER 2020

11/06/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 72F,
BREAKS PREVIOUS RECORD OF 71F SET IN 1959 AND 2015

11/07/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 75F,
TIES PREVIOUS RECORD OF 75F SET IN 1938

11/08/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 73F,
BREAKS PREVIOUS RECORD OF 72F SET IN 1938

11/09/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 74F,
BREAKS PREVIOUS RECORD OF 72F SET IN 1975

11/11/20: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 58F,
BREAKS PREVIOUS RECORD OF 56F IN 2002
DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 73F,
BREAKS PREVIOUS RECORD OF 68F IN 1984

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

RECORDS FOR NOVEMBER 21
HIGH 69 IN 1931
LOW 10 IN 1888
PRECIP 2.60 INCHES IN 1950
SNOWFALL 4.0 INS IN 1929
PEAK GUST 69 NW IN 1989

RECORDS FOR NOVEMBER 22
HIGH 70 IN 1931
LOW 9 IN 2018
PRECIP 1.78 INS IN 2005
SNOWFALL 9.0 INS IN 1971
PEAK GUST 70e SE IN 1945

TODAY’S REPORT PREPARED BY: Benjamin Turner + Andrew Swanson

Category: Daily Discussions

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