Wednesday, November 13, 2019

| November 15, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, NOVEMBER 13, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

VERY COLD FOLLOWING LAST NIGHT’S SNOW….

Weather conditions have been almost clear and dry,
with dew points in the single digits. Visibility
was 85 miles all day. Snowfall yesterday amounted
to a 1/10th inch, with 0.08 inches of liquid
precipitation. Wind has been significant today,
frequently gusting over 30 mph.

Considering the strong cold air advection from
the west, temperatures are well below normal.
The high so far today is 28F, which is on track
to set a new low maximum record. This will replace
the last record of 30F in 1920! The low since
midnight is 15F, which is one degree above the
record of 14F, set in 1920. A very cold day indeed.

PRELIMINARY STATS FOR OCTOBER 2019

TEMPERATURE, Deg. F
Avg. Max. 60.5 [+0.2]
Avg. Min. 46.7 [+3.8]
Mean      53.6 [+2.0]
24-hour corrected mean: 53.3
Max. for month: 77F on the 7th
Min. for month: 35F on the 5th

HEATING DEGREE DAYS
Total heating units:   347  [-74]
Total for the season:  440 [-123]
Total for last season: 543

PRECIPITATION, Inches
Total: 6.92 [+2.23]
Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 12.2 mph
Avg. corrected wind speed:   12.6 mph
Prevailing wind direction:   NE [13%]
Peak gust and direction:     61 S,E on the 17th, 31st

SUNSHINE:
Campbell-Stokes card minutes: 7074 minutes of possible 19824 or 36%
Astronomical total minutes: 7330 minutes of possible 20566 or 36%

This was the second cloudiest October on record!

BHO Lowest October Sunshine, hours (1886-2019):

1) 80.5 in 1913  [24%]
2) 117.9 in 2019  [36%]
3) 120.3 in 1896  [36%]
4) 121.6 in 1919  [37%]
5) 124.9 in 1888  [38%]

Today’s Observations:

7 A.M.
Weather: Clear, few distant cumulus/ altocumulus offshore
Temperature: 15F; Dew Point: 1F; Wind: WNW at 18G26 kts,
Peak Wind: 30 MPH (26 kts) WNW at 6:55 A.M.
Sea-level pressure: 30.26 ins. Hg, rising, then more rapidly
Visibility: 85 miles
6-hr Max temp: 19F
6-hr Min temp: 15F
24-hr Precip:  0.08 ins.
24-hr Snowfall: 0.1 ins.
BHO SA 1155 CLR 85 247/15/1/2918G26/026/ FEW DSNT CU/SC OFFSHR PK
WND 2926/55/ 8/800 70008 51027 10019 20015

10 A.M.
Weather: Clear, few distant cumulus offshore
Temperature: 22F; Dew Point: 3F; Wind: WNW at 18G26 kts,
Peak wind: 30 MPH (26 kts) WNW at 9:20 A.M.
Sea-level pressure: 30.34 ins. Hg, falling then rising
Visibility: 85 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 85 275/22/3/3018G26/034/ FEW DSNT CU OFFSHR PK WND
3026/20/ 8/100 51028

1 P.M.
Weather: Clear, few distant cumulus offshore
Temperature: 27F; Dew Point: 6F; Wind: WNW at 15, gusting to 25 kts
Sea-level pressure: 30.35 ins. Hg, rising steadily
Peak wind: 32 MPH (28 kts) at 11:39 A.M.
Visibility: 85 miles
6-hr Max temp: 28F
6-hr Min temp: 15F
6-hr Precip: 0.00 ins.
BHO SA 1755 CLR 85 279/27/6/3015G25/035/ FEW DSNT CU OFFSHR PK WND
3028/1639/ 8/100 53004 10028 20015

SUMMARY FOR TUESDAY, NOVEMBER 12, 2019

TEMPERATURE (DEGREES F)
MAX…..42   NORMAL…..51
MIN…..20   NORMAL…..35
MEAN….31   NORMAL…..43

DEPARTURE FROM 30-YEAR NORMAL……………….-12
TOTAL DEPARTURE FOR THE MONTH……………….-38 [-3.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………34  DEPARTURE……..+12
TOTAL HEATING UNITS FOR THE MONTH…………..282  DEPARTURE……..+38
TOTAL HEATING UNITS FOR THE SEASON………….722  DEPARTURE……..-85
TOTAL HEATING UNITS LAST SEASON TO DATE……..757  DEPARTURE……..-35

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..37 WNW AT 11:07 P.M.
AERO…………………….37 WNW AT  9:55 P.M
ASOS…………………….40 NW  AT 11:10 P.M.
DAVIS……………………42 W   AT 11:09 P.M. RMY 41
FASTEST MILE FOR YESTERDAY………………….28 WNW AT  8:52 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….26 NW  AT  9:10 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………29 WNW AT  8:08 P.M.
AVERAGE WIND SPEED AND DIRECTION…………….12.1 WNW
ASOS…………………….12.0
DAVIS……………………12.5 NW [310 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.08  DEPARTURE……-0.08
ASOS…………..0.10
TOTAL PRECIPITATION FOR THE MONTH……….0.72  DEPARTURE……-1.00
ASOS…………..0.74
TOTAL PRECIPITATION FOR THE YEAR……….46.06  DEPARTURE……+0.56
ASOS………….46.21

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.1  DEPARTURE…….+0.1
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE…….-0.4
TOTAL SNOWFALL FOR THE SEASON……………0.1  DEPARTURE…….-0.9

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  67/52/60/+3/0.06/028/04               28 SW  AERO 25 SSW RMY 29
10/02  74/49/62/+5/0.42/021/03               30 ENE AERO 25 ENE RMY 28
10/03  51/46/49/-7/…./000/00               28 ENE AERO 26 ENE RMY N/A
10/04  59/40/50/-6/…./397/57               38 NNW AERO 38 NNW RMY 38
10/05  58/35/47/-9/0.00/687/99               21 N   AERO 18 SSW RMY N/A
10/06  65/44/55/0/0.00/263/38                36 SSW AERO 35 SSW RMY N/A
10/07  77/57/67/+12/0.12/316/46              47 SSW AERO 46 SSW RMY 49
10/08  60/52/56/+2/T/000/00                  22 NE  AERO 18 NW  RMY N/A
10/09  55/49/52/-2/…./000/00               43 NE  AERO 37 NE  RMY 44
10/10  54/47/51/-3/…./000/00               41 NE  AERO 37 NE  RMY 42
10/11  52/48/50/-3/…./000/00               41 NE  AERO 39 NE  RMY 41
10/12  52/49/51/-2/…./000/00               39 NE  AERO 37 NE  RMY N/A
10/13  66/48/57/+4/…./570/85               18 WNW AERO 17 WNW RMY 18
10/14  67/51/59/+7/…./335/50               18 WSW AERO 17 WSW RMY N/A
10/15  61/43/52/0/…./653/98                18 NNW AERO 17 NNW RMY N/A
10/16  61/45/53/+2/…./305/46               58 ESE AERO 58 ESE RMY N/A
10/17  60/46/53/+2/…./086/13               61 E   AERO 63 E   RMY N/A
10/18  57/41/49/-2/…./099/15               29 WNW AERO 32 W   RMY 32
10/19  58/36/47/-3/…./648/99               18 NW  AERO 18 NW  RMY 19
10/20  60/43/52/+2/T/280/43                  14 NE  AERO 16 NE  RMY N/A
10/21  59/49/54/+4/0.01/591/91               25 E   AERO 21 NE  RMY 23
10/22  58/47/53/+4/…./078/12               29 E   AERO 28 E   RMY 23
10/23  65/48/57/+8/…./431/67               35 W   AERO 35 W   RMY 36
10/24  67/43/55/+6/…/635/99                28 SSW AERO 28 SSW RMY 29
10/25  64/47/56/+7/…/217/34                20 WSW AERO 21 SW  RMY N/A
10/26  58/45/52/+4/…/502/79                20 N   AERO 18 N   RMY N/A
10/27  52/45/49/+1/1.43/000/00               37 ESE AERO 35 ESE RMY 37
10/28  53/46/50/+2/…/050/08                24 NNW AERO 24 NNW RMY N/A
10/29  54/47/51/+4/…./000/00               15 ESE AERO 15 ESE RMY 14
10/30  65/51/58/+11/…./138/22              24 S   AERO M  M   RMY N/A
10/31  68/58/63/+16/…./000/00              61 S   AERO M  M   RMY N/A

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  67/35/51/+5/…./0.0/…/..            67 S   AERO M  M   RMY N/A
11/02  50/31/41/-5/0.00/0.0/…/..            17 WNW AERO 14 W   RMY N/A
11/03  53/35/44/-2/0.00/0.0/…/..            25 WSW AERO 23 W   RMY 26
11/04  53/33/43/-2/0.00/0.0/…/..            24 S   AERO 20 S   RMY 24
11/05  54/44/49/+4/0.33/0.0/…/..            22 S   AERO 18 WNW RMY 28
11/06  51/36/44/-1/0.00/0.0/…/..            28 WSW AERO 23 W   RMY 27
11/07  55/38/47/+2/0.27/0.0/…/..            30 S   AERO 26 SSW RMY 32
11/08  38/23/31/-13/0.00/0.0/…/..           38 NW  AERO 37 WNW RMY 44
11/09  39/20/30/-14/0.00/0.0/…/..           22 S   AERO 18 S   RMY N/A
11/10  51/30/41/-3/0.00/0.0/…/..            30 SW  AERO 30 SW  RMY 31
11/11  52/39/46/+3/T/0.0/…/..               23 NE  AERO 22 NE  RMY 23
11/12  42/20/31/-12/0.08/0.1/…/..           37 WNW AERO 37 WNW RMY 41

11/13 The low since midnight is 15F, daily normal minimum is 34F

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: Benjamin Turner and Greg White

Category: Daily Discussions

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