Tuesday, November 17, 2020

| November 17, 2020 | Reply

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

TUESDAY, NOVEMBER 17, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

EVEN COOLER TODAY WITH A BRISK WEST WIND….

While not as windy as yesterday, we still have a
busy west wind that’s been gusting to 20-25 mph at
times. With temperatures about 7-10 degrees cooler
than yesterday, it’s definitely adding a chill to
the air.

A low dew point is also adding to the chill with
readings in the low to mid 20s all day so far. So
the air is quite dry.

Despite the dry air, visibility hasn’t been as
spectacular as one might expect, generally sitting
in the 50-60 mile range.

The high so far today is 46F, 4 degrees below the
daily normal high of 50F. The low since midnight
is 34F, 1 degree above the normal low of 33F.

PRELIMINARY STATS FOR OCTOBER 2020

TEMPERATURE, Deg. F
Avg. Max. 61.2 [+0.9]
Avg. Min. 45.5 [+2.6]
Mean      53.4 [+1.8]
24-hour corrected mean: 52.7
Max. for month: 75F on the 1st and 10th
Min. for month: 24F on the 31st

HEATING DEGREE DAYS
Total heating units:   354  [-67]
Total for the season:  452 [-111]
Total for last season: 440

COOLING DEGREE DAYS
Total cooling units:      1  [-4]
Total for the season:   831  [+229]
Total for last season:  682

PRECIPITATION, Inches
Total: 6.75 [+2.06]
Greatest in 24 hrs: 2.24 inches on the 16-17th

SNOWFALL, Inches
Total: 6.5 [+6.2]
Greatest in 24 hrs: 6.5 inches on the 30th

WIND, mph
Avg. uncorrected wind speed: 10.7 mph
Avg. corrected wind speed:   11.3 mph
Prevailing wind direction:   S [12%]
Peak gust and direction:     76 S on the 7th

SUNSHINE:
Campbell-Stokes card minutes: 10008 minutes of a possible 19824 or 50%
Astronomical total minutes: 10345 minutes of a possible 20500 or 50%

Today’s Observations:

7 A.M.
Weather: Broken cirrostratus, thin broken cirrus,
few stratocumulus/cumulus offshore distant NE-ESE
Temperature: 35F; Dew Point: 26F; Relative Humidity: 69%
Wind: W at 15G21 kts
Sea-level pressure: 29.90 ins. Hg: falling then rising
Visibility: 50 miles
6-hr Max temp: 39F
6-hr Min temp: 34F
24-hr Precip: 0.00 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 E200 BKN 250 -BKN 50 125/35/26/2715G21/990/
FEW SC/CU OFFSHR DSNT NE-ESE/ 8/206 53001 10039 20034

10 A.M.
Weather: Scattered altocumulus, thin broken cirrus,
few stratocumulus all quadrants, few cumulus offshore
distant NE-E
Temperature: 42F; Dew Point: 23F; Relative Humidity: 46%
Wind: W at 15G22 kts
Sea-level pressure: 29.90 ins. Hg: rising then falling
Visibility: 60 miles
3-hr Precip: 0.00 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 120 SCT E250 -BKN 60 126/42/23/2715G22/990/
FEW SC ALQDS FEW CU OFFSHR DSNT NE-E/ 8/572 50001

1 P.M.
Weather: Scattered stratocumulus, scattered altocumulus
standing lenticular, thin broken cirrus
Temperature: 45F; Dew Point: 24F; Relative Humidity: 43%
Wind: W at 8 kts
Sea-level pressure: 29.87 ins. Hg: falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 46F
6-hr Min temp: 35F
6-hr Precip: 0.00 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 45 SCT 75 SCT E250 -BKN 60 114/45/24/2808/987/
8/541 58012 10046 20035

SUMMARY FOR MONDAY, NOVEMBER 16, 2020

TEMPERATURE (DEGREES F)
MAX…….53   NORMAL…..50
MIN…….39   NORMAL…..34
MEAN……46   NORMAL…..42

DEPARTURE FROM 30-YEAR NORMAL……………….  +4
TOTAL DEPARTURE FOR THE MONTH……………….+126 [+7.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………19  DEPARTURE…… -4
TOTAL HEATING UNITS FOR THE MONTH…………..210  DEPARTURE…..-125
TOTAL HEATING UNITS FOR THE SEASON………….662  DEPARTURE…..-236
TOTAL HEATING UNITS LAST SEASON TO DATE……..861  DEPARTURE…..-199

PEAK WIND GUST FOR YESTERDAY (MPH):
420C/Official…………..40 WNW  AT  1:10 P.M.
AEROVANE (south tower)…..41 WNW  AT  1:11 P.M.
ASOS…………………..41 WNW  AT  1:11 P.M.
DAVIS #1……………….40 WNW  AT  1:11 P.M.
DAVIS #2 (south tower)…..41 W    AT  1:32 P.M.
RMY……………………43
VECTOR…………………45
MERLIN…………………40

FASTEST MILE FOR YESTERDAY:
CONTACTING/OFFICIAL………………………..33 W    AT 10:26 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….30 W    AT 10:27 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………33 WNW  AT 10:26 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………31 W    AT 10:27 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……14.8 WSW [356 total miles]
ASOS…………………14.4     [346 total miles]
DAVIS #1……………..15.4 W   [370 total miles]
VECTOR……………….15.1 W   [362 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….-0.77
ASOS………….1.78
TOTAL PRECIPITATION FOR THE YEAR………….42.91  DEPARTURE….-3.37
ASOS………..43.73

SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HOURS ENDING 7 A.M………..0.0  DEPARTURE……0.0
TOTAL SNOWFALL FOR THE MONTH……………..Trace  DEPARTURE…..-0.7
TOTAL SNOWFALL FOR THE SEASON………………6.5  DEPARTURE…..+5.5

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

10/01  75/56/66/+9/0.00/591/84           28 SW    AERO 28 SW   RMY N/A
10/02  63/49/56/-1/0.02/203/29           20 NW    AERO 21 NW   RMY 20
10/03  65/45/55/-1/0.00/676/97           19 WNW   AERO 19 WNW  RMY 19
10/04  65/45/55/-1/0.00/659/95           17 ESE   AERO 18 ESE  RMY 18
10/05  62/52/57/+1/0.00/277/40           17 ENE   AERO 17 ENE  RMY N/A
10/06  69/51/60/+5/0.00/503/73           28 S     AERO 28 S    RMY 29
10/07  73/50/62/+7/0.14/316/46           76 W     AERO 74 W    RMY 70  TSTM
10/08  61/42/52/-2/0.00/676/99           41 W     AERO 41 W    RMY N/A
10/09  60/37/49/-5/0.00/646/95           25 SSW   AERO 28 SSW  RMY N/A
10/10  75/52/64/+10/0.00/549/81          40 SSW   AERO 40 SSW  RMY 38
10/11  64/47/56/+3/0.00/574/85           32 NNW   AERO 35 NNW  RMY N/A
10/12  52/48/50/-3/T/000/00              28 E     AERO 27 E    RMY N/A
10/13  57/49/53/0/1.74/000/00            32 E     AERO 33 E    RMY N/A
10/14  67/47/57/+5/0.00/606/91           23 WNW   AERO 25 WNW  RMY N/A
10/15  71/50/61/+9/0.00/511/77           43 S     AERO 46 S    RMY 42
10/16  68/48/58/+7/1.00/020/03           28 S     AERO 30 S    RMY N/A
10/17  56/39/48/-3/1.24/480/73           35 WNW   AERO 40 WNW  RMY 37
10/18  60/46/53/+2/0.00/622/95           20 ESE   AERO 21 ESE  RMY 20
10/19  61/46/54/+4/0.00/575/88           16 ESE   AERO 16 SSE  RMY N/A
10/20  66/49/58/+8/0.00/065/10           22 S     AERO 22 S    RMY 22
10/21  71/56/64/+14/0.06/000/00          26 SSW   AERO 26 SSW  RMY 26
10/22  70/54/62/+13/0.00/471/73          18 SSW   AERO 17 SSW  RMY N/A
10/23  68/52/60/+11/0.00/340/53          18 ESE   AERO 18 ESE  RMY 18
10/24  68/42/55/+6/0.00/217/34           32 NNW   AERO 32 NNW  RMY 32
10/25  50/40/45/-4/0.00/134/21           19 NNW   AERO 19 NNW  RMY N/A
10/26  52/43/48/0/0.02/000/00            20 E     AERO 18 ESE  RMY 20
10/27  52/43/48/0/T/038/06               22 NNW   AERO 22 NNW  RMY N/A
10/28  49/42/46/-2/0.33/000/00           18 W     AERO 18 W    RMY 18
10/29  46/41/44/-3/1.26/000/00           39 NE    AERO 38 NE   RMY 38
10/30  41/26/34/-13/0.94/000/00          37 NNE   AERO 44 NNE  RMY N/A
10/31  39/24/32/-15/0.00/596/96          18 SSE   AERO 20 SSE  RMY 17

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   The low since midnight is 34F, the daily normal low is 33F

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 17
HIGH 74 IN 1928
LOW 10 IN 1924
PRECIP 1.92 INCHES IN 1920
SNOWFALL 1.0 INS IN 1980
PEAK GUST 61 SSE IN 2006

RECORDS FOR NOVEMBER 18
HIGH 72 IN 1963
LOW 10 IN 1936
PRECIP 1.80 INS IN 1929
SNOWFALL 6.3 INS IN 1980
PEAK GUST 60 SW IN 1987

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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