Tuesday, November 12, 2019

| November 12, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, NOVEMBER 12, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

FIRST SNOW OF THE SEASON OCCURRING TODAY AT BLUE HILL…

A strong cold front has passed through the region early this
afternoon bringing with it rain, and now some snow. Rain began
falling late this morning accumulating to 0.06″ as of the 1 P.M.
observation. Snow began mixing in with the rain just after the
obs, thus bringing us our first trace of snow for the season.
We’ll be on the look out for any potential minor accumulation
on the summit as the afternoon progresses.

The well advertised drop in temperature has now started with the
temperature dropping to 35F degrees so far since the 1 P.M. obs.
The high so far today (and likely to be it) is 42F, which is 9
degrees below the normal high of 51F. The low since midnight is 35F,
but will likely drop well below that before midnight tonight. The
normal minimum for today is 35F.

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: Vertical visibility 200 feet, sky obscurded
Temperature: 40F; Dew Point: 40F; Wind: E at 9 kts
Sea-level pressure: 29.70 ins. Hg, falling, then more rapidly
Visibility: 1/4 miles, fog
6-hr Max temp: 40F
6-hr Min temp: 36F
24-hr Precip: Trace
BHO SA 1155 W2 X 1/4F 057/40/40/1009/970/ 8//// 58023 70000 10040 20036

10 A.M.
Weather: Overcast stratocumulus
Temperature: 40F; Dew Point: 40F; Wind: WNW at 6 kts
Sea-level pressure: 29.70 ins. Hg, falling then rising
Visibility: 2 miles, fog
BHO SA 1455 E60 OVC 2F 058/40/40/2906/970/ RB30EUKN WND LGT/ 8/5// 51001 6000

1 P.M.
Weather: Overcast stratus, light rain
Temperature: 39F; Dew Point: 39F; Wind: WNW at 15, gusting to 22 kts
Sea-level pressure: 29.74 ins. Hg, rising, then more rapidly
Visibility: 6 miles, fog
6-hr Max temp: 42F
6-hr Min temp: 38F
BHO SA 1755 E10 OVC 6R-F 070/39/39/2915G22/974/ 8/7// 53012 6006 10042 20038

SUMMARY FOR MONDAY, NOVEMBER 11, 2019

TEMPERATURE (DEGREES F)
MAX…..52   NORMAL…..52
MIN…..39   NORMAL…..35
MEAN….46   NORMAL…..43

DEPARTURE FROM 30-YEAR NORMAL………………..+3
TOTAL DEPARTURE FOR THE MONTH……………….-27 [-2.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………19  DEPARTURE………-3
TOTAL HEATING UNITS FOR THE MONTH…………..248  DEPARTURE……..+26
TOTAL HEATING UNITS FOR THE SEASON………….688  DEPARTURE……..-97
TOTAL HEATING UNITS LAST SEASON TO DATE……..730  DEPARTURE……..-42

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..23 NE  AT  3:59 P.M.
AERO…………………….22 NE  AT  3:50 P.M
ASOS…………………….25 NE  AT  4:02 P.M.
DAVIS……………………24 NE  AT  4:00 P.M. RMY 23
FASTEST MILE FOR YESTERDAY………………….18 NE  AT  4:04 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 NE  AT  4:03 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………18 NE  AT  4:00 P.M.
AVERAGE WIND SPEED AND DIRECTION……………..9.8 NE
ASOS……………………..9.7
DAVIS……………………10.2 NE [045 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…TRACE  DEPARTURE……-0.16
ASOS…………..0.00
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……….0.0  DEPARTURE……..0.0
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE…….-0.4
TOTAL SNOWFALL FOR THE SEASON……………0.0  DEPARTURE…….-0.7

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 The low since midnight is 35F, daily normal minimum is 35F

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

RECORDS FOR NOVEMBER 12
HIGH 74 IN 1909
LOW 18 IN 1926
PRECIP 3.25 INCHES IN 1947
SNOWFALL 8.1 INCHES IN 1987
PEAK GUST 79e MPH NW IN 1947

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

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

Leave a Reply