Saturday, November 20, 2021

| November 20, 2021 | Reply

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

SATURDAY, NOVEMBER 20, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0641E
SUNSET:  1618E

AN EXCELLENT VISIBILITY DAY WITH COOL TEMPERATURES AND
A LIGHT WESTERLY WIND….

Today we observed 85 miles for the average visibility with
skies being partly cloudy at most. Wind is almost a non-factor
as of 2 P.M., being light and variable from the west. The max
gust earlier today was 20 mph very early on this morning.

The high so far today is 44F, 5 degrees below the normal max of 49F.
The low since midnight is 27F, 6 degrees below the normal low of 33F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Clear, few distant cumulus NE-SE-S, few distant cirrus
NE-SE-S
Temperature: 28F; Dew Point: 24F; Relative Humidity: 85%
Wind: WNW @ 8G12kts
Sea-level pressure: 1033.5 mb; 30.52 in. Hg: rising, then more rapidly
6-hr Max temp: 45F
6-hr Min temp: 27F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 80 335/28/24/3008G12/052/ FEW CU DSNT NE-SE-S FEW CI DSNT
NE-SE-S/ 8/101 53021 10045 20027

10 A.M.
Weather: Clear, few distant cumulus NE-SE, few distant
altocumulus W, few distant cirrus SW-W
Temperature: 36F; Dew Point: 23F; Relative Humidity: 42%
Wind: NW @ 5G13kts, wind light
Sea-level pressure: 1034.5 mb; 30.55 in Hg; rising unsteadily
Visibility: 85 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 85 345/36/23/3105G13/055/ FEW CU DSNT NE-SE FEW AC
DSNT W FEW CI DSNT SW-W WND LGT/ 8/171 52010

1 P.M.
Weather: Scattered cirrus
Temperature: 42F, Dew point: 21F; Relative Humidity: 42%
Wind: S @ 5 kts
Sea-level pressure: 1034.2 mb; 30.54 in Hg; falling unsteadily
Visibility: 85 miles
6-hr Max temp: 44F
6-hr Min temp: 28F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 SCT 85 342/42/21/1905/054/ 8/005 57003 10044 20028

SUMMARY FOR FRIDAY, NOVEMBER 19, 2021

TEMPERATURE (DEGREES F)
MAX…….51     NORMAL…..49
MIN…….32     NORMAL…..33
MEAN……42     NORMAL…..41

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………… +1
TOTAL DEPARTURE FOR THE MONTH……………………… +47 [+2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY……………23  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………..355  DEPARTURE…….-48
TOTAL HEATING UNITS FOR THE SEASON………….682  DEPARTURE……-233
TOTAL HEATING UNITS LAST SEASON TO DATE……..760  DEPARTURE…… -78

PEAK WIND GUST (MPH):
Official (1-Sec AVG)…….42 W   @  3:08 P.M.
AEROVANE……………….41 W   @  3:19 P.M.
VECTOR #2 (Instantaneous)..44     @  3:08 P.M.
DAVIS #2 ………………40 W   @  1:19 P.M.
RMY #2 (Instantaneous)…..41 W   @  1:19 P.M.
ASOS………..OUT OF SERVICE D/T RENOVATIONS
VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
RMY #1………OUT OF SERVICE D/T RENOVATIONS
MERLIN………OUT OF SERVICE D/T RENOVATIONS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………27 W   @  3:08 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..31     @  3:09 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………31 WNW @  3:09 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..30 W   @  3:09 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY #1 AVERAGE…..OUT OF SERVICE D/T RENOVATIONS

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……. 14.8 WNW [354 total miles]
VECTOR #2…………….. 15.4
DAVIS #2……………… 15.3 NW
RMY #2……………….. 15.1 NW
RMY #1…………..OUT OF SERVICE D/T RENOVATIONS
ASOS…………….OUT OF SERVICE D/T RENOVATIONS
VECTOR #1………..OUT OF SERVICE D/T RENOVATIONS
DAVIS #1…………OUT OF SERVICE D/T RENOVATIONS

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00  DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH………….1.71  DEPARTURE…..-0.99
TOTAL PRECIPITATION FOR THE YEAR………….56.56  DEPARTURE…..+9.96

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………….0.0  DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE MONTH……………….0.0  DEPARTURE……-0.7
TOTAL SNOWFALL FOR THE SEASON (2021-2022)……0.0  DEPARTURE……-1.4

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   59/41/50/+3/0.00/0.0/594/96      38 WNW AERO 39 WNW RMY 39
11/02   56/40/48/+1/0.00/0.0/247/40      25 SW  AERO 25 SW  RMY 26
11/03   51/35/43/-3/0.00/0.0/572/93      28 W   AERO 25 W   RMY 27
11/04   49/31/40/-6/0.00/0.0/446/73      17 NNE AERO 17 NNW RMY 16
11/05   49/32/41/-5/0.00/0.0/591/97      25 NW  AERO 24 NW  RMY 24
11/06   51/34/43/-2/0.00/0.0/595/98      18 SSW AERO 17 SW  RMY 19
11/07   55/37/46/+1/0.00/0.0/514/85      17 W   AERO 17 W   RMY 16
11/08   60/38/49/+4/0.00/0.0/578/96      20 N   AERO 18 N   RMY 19
11/09   69/45/57/+13/0.00/0.0/582/97     21 W   AERO 21 W   RMY 22
11/10   60/44/52/+8/0.00/0.0/389/65      36 NW  AERO 35 NW  RMY 35
11/11   56/40/48/+5/0.00/0.0/501/84      26 SE  AERO 28 SE  RMY 27
11/12   61/45/53/+10/1.00/0.0/000/00     72 SSE AERO 78 SSE RMY 76
11/13   60/36/48/+5/0.32/0.0/556/94      53 SW  AERO 53 SW  RMY 54
11/14   47/33/40/-2/0.03/0.0/336/57      29 W   AERO 28 W   RMY 28
11/15   48/36/42/0/0.07/0.0/405/69       35 W   AERO 36 W   RMY 38
11/16   46/31/39/-3/0.00/0.0/…/..      40 WNW AERO 41 WNW RMY 42
11/17   49/30/40/-1/0.00/0.0/…/..      34 S   AERO 36 S   RMY 34
11/18   69/49/59/+18/0.00/0.0/…/..     39 NW  AERO 36 WNW RMY 42
11/19   51/32/42/+1/0.29/0.0/…/..      42 W   AERO 41 W   RMY 41

11/20   The low since midnight is 27F, the daily normal low is 32F

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

RECORDS FOR NOVEMBER 20
HIGH 72 IN 1953
LOW 9 IN 1894
PRECIP 2.78 INS IN 1988
SNOWFALL 3.0 INS IN 1897
PEAK GUST 73e S IN 1950

RECORDS FOR NOVEMBER 21
HIGH 69 IN 1931
LOW 10 IN 1888
PRECIP 3.41 INCHES IN 1950
SNOWFALL 4.0 INS IN 1929
PEAK GUST 69 NW IN 1989

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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