Friday, November 13, 2020

| November 13, 2020 | Reply

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

FRIDAY, NOVEMBER 13, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A SOGGY AND DREARY FRIDAY ATOP GREAT BLUE HILL….

The warm September vibes have officially come to an end!
After setting 5 record highs and 1 record high minimum
in the past 7 days(!), we bottomed out at 43F this morning
– only rising to 48F by early afternoon thanks to a
persistent onshore flow. Winds have peaked so far at
22 MPH from the ENE.

The other story is the fog and rain. The summit has
been socked in fog all day with visibility averaging
1/8 of a mile. Intermittent showers continue to roll
through with meager amounts. Our 24-hour total ending
at 7E this morning registered just 0.06 inches. Since
then, only 0.10 inches of rain have fallen.

The high so far today is 48F, 3F below the daily normal
high of 51F. The low since midnight is 43F, 9F above the
normal low of 34.

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: Light rain (sky obscured, vertical visibility 300ft)
Temperature: 44F; Dew Point: 44F; Relative Humidity: 100%
Wind: NE at 7 kts
Sea-level pressure: 30.08 ins. Hg: steady, then falling
Visibility: 1/16 mile, fog
6-hr Max temp: 44F
6-hr Min temp: 43F
24-hr Precip: 0.06 ins.
24-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1155 X W3 1/16R-F 185/44/44/0507/008/ R-CTD/ 8////
58004 70006 10044 200433

10 A.M.
Weather: Light rain (sky obscured, vertical visibility 300ft)
Temperature: 46F; Dew Point: 46F; Relative Humidity: 100%
Wind: ENE at 9 kts
Sea-level pressure: 30.04 ins. Hg: rising, then falling
Visibility: 1/8 mile, fog
3-hr Precip: 0.06 ins.
3-hr Snow: 0.0 ins.
BHO SA 1455 X W3 1/8R-F 173/46/46/0609/004/ R-CTD/ 8//// 58012 6006/

1 P.M.
Weather: Light rain (sky obscured, vertical visibility 300ft)
Temperature: 47F; Dew Point: 47F; Relative Humidity: 100%
Wind: ENE at 7 kts
Sea-level pressure: 29.95 ins. Hg: falling, then falling more slowly
Visibility: 1/8 mile, fog
6-hr Max temp: 48F
6-hr Min temp: 44F
6-hr Precip: 0.10 ins.
6-hr Snow: 0.0 ins.
Snow Depth: 0 ins.
BHO SA 1755 X W3 1/8R-F 142/47/47/0707/995/ R-CTD/ 8////
56031 6010/ 10048 20044

SUMMARY FOR THURSDAY, NOVEMBER 12, 2020

TEMPERATURE (DEGREES F)
MAX…….64   NORMAL…..51
MIN…….46   NORMAL…..35
MEAN……55   NORMAL…..43

DEPARTURE FROM 30-YEAR NORMAL……………….+12
TOTAL DEPARTURE FOR THE MONTH……………….+121 [+9.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………12  DEPARTURE……-10
TOTAL HEATING UNITS FOR THE MONTH…………..124  DEPARTURE…..-120
TOTAL HEATING UNITS FOR THE SEASON………….576  DEPARTURE…..-231
TOTAL HEATING UNITS LAST SEASON TO DATE……..722  DEPARTURE…..-146

PEAK WIND GUST FOR YESTERDAY (MPH):
420C/Official…………..32 NNW  AT 12:39 P.M.
AEROVANE (south tower)…..31 NNW  AT 12:40 P.M.
ASOS…………………..32 NNW  AT 12:40 P.M.
DAVIS #1……………….32 N    AT 12:40 P.M.
DAVIS #2 (south tower)…..30 N    AT 12:40 P.M.
RMY……………………33      AT 12:39 P.M.
VECTOR…………………36      AT 12:38 P.M.
MERLIN…………………31

FASTEST MILE FOR YESTERDAY:
CONTACTING/OFFICIAL………………………..23 NNW  AT 12:40 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 NNW  AT 12:40 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………24 NNW  AT 12:140 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 NNW  AT 12:40 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….10.0 NNW [241 total miles]
ASOS…………………..9.5     [228 total miles]
DAVIS #1………………10.2 NNW [245 total miles]
DAVIS #2 (south tower)….10.4 NNW [250 total miles]
VECTOR………………..10.2     [245 total miles]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.06  DEPARTURE….-0.10
ASOS………….0.06
TOTAL PRECIPITATION FOR THE MONTH………….0.82  DEPARTURE….-1.06
ASOS………….0.84
TOTAL PRECIPITATION FOR THE YEAR………….41.99  DEPARTURE….-3.66
ASOS………..42.79

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…..-0.4
TOTAL SNOWFALL FOR THE SEASON………………6.5  DEPARTURE…..+5.8

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/…/..      38 W     AERO 40 W    RMY 39
11/02   40/31/36/-10/T/T/…/..          61 WNW   AERO 62 WNW  RMY 62
11/03   43/29/36/-10/0.00/0.0/…/..     48 WNW   AERO 53 WNW  RMY 48
11/04   54/30/42/-3/0.00/0.0/…/..      30 SSW   AERO 30 SSW  RMY 30
11/05   69/49/59/+14/0.00/0.0/…/..     37 SSW   AERO 40 SSW  RMY 38
11/06   72/55/64/+19/0.00/0.0/…/..     28 SW    AERO 28 SW   RMY M
11/07   75/54/65/+20/0.00/0.0/…/..     21 WSW   AERO 21 WSW  RMY 21
11/08   73/54/64/+20/0.00/0.0/…/..     18 W     AERO 18 W    RMY 19
11/09   74/52/63/+19/0.00/0.0/…/..     20 WSW   AERO 18 WSW  RMY 21
11/10   74/53/64/+20/0.00/0.0/…/..     30 SW    AERO 28 SW   RMY 31
11/11   73/58/66/+23/…./…/…/..     40 SW    AERO 44 SW   RMY 45
11/12   64/46/55/+12/…/…/…/..      32 NNW   AERO 31 NNW  RMY 33

11/13   The low since midnight is 43F, the daily normal low is 34F

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 13
HIGH 66 IN 1931, 1964
LOW 14 IN 1920
PRECIP 1.96 INCHES IN 1982
SNOWFALL 4.6 IN 2004
PEAK GUST 77 S IN 1982

RECORDS FOR NOVEMBER 14
HIGH 70 IN 1993
LOW 11 IN 1905
PRECIP 2.08 INCHES IN 2009
SNOWFALL 3.5 IN 1997, 2014
PEAK GUST 63 W IN 2003

TODAY’S REPORT PREPARED BY: Andrew Swanson

Category: Daily Discussions

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