Friday, October 11, 2019

| October 11, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, OCTOBER 11, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

CONSISTENT RAINFALL, OVERCAST CONDITIONS AND LOW VISIBILITY
ATOP GREAT BLUE HILL….

We observed very limited visibility with our max visibility briefly being
40 miles. Winds continue to remain stiff from the NE with our coastal low
spinning offshore. The highest gust since midnight is 41 mph, which occurred
around 4 AM this morning. Our overnight rainfall amounted to a measly 0.05
inches, with with another 0.45 ins falling between 7 A.M. and 1 P.M. With
cloudy conditions and persistent NE winds, temperatures have varied very
little. The high so far today is 50F, which is 12 degrees below the normal
high of 62F. The low since midnight was 48F, which is 3 degrees above the
daily normal minimum of 45F.

PRELIMINARY STATS FOR SEPTEMBER 2019

TEMPERATURE, Deg. F
Avg. Max. 73.6 [+2.0]
Avg. Min. 54.5 [-0.1]
Mean      64.1 [+1.0]
24-hour corrected mean: 63.4
Max. for month: 88F on the 23rd
Min. for month: 43F on the 19th

HEATING DEGREE DAYS
Total heating units:    81 [-36]
Total for the season:   93 [-49]
Total for last season:  87

COOLING DEGREE DAYS
Total cooling units:    58  [-2]
Total for the season:  680 [+83]
Total for last season: 863

PRECIPITATION, Inches
Total: 1.27 [-2.79]
Greatest in 24 hrs: 0.37 ins. on the 2nd

WIND, mph
Avg. uncorrected wind speed: 10.3 mph
Avg. corrected wind speed:   10.9 mph
Prevailing wind direction:   SSW [11%]
Peak gust and direction:     39 W on the 2nd

SUNSHINE:
Campbell-Stokes card minutes: 14790 minutes of possible 21582 or 69%
Astronomical total minutes: 15399 minutes of possible 22468 or 69%

Today’s Observations:

7 A.M.
Weather: Scattered stratus factus, overcast nimbostratus, light rain
Temperature: 48F; Dew Point: 48F; Wind: NNE at 16G32 kts,
Peak Wind: 39 MPH (34 kts) NNE at 4:08 A.M.
Sea-level pressure: 30.17 ins. Hg, rising
Visibility: 3 miles, fog
6-hr Max temp: 52F
6-hr Min temp: 49F
24-hr Precip: 0.06 ins.
BHO SA 1155 15 SCT E60 OVC 3R-F 217/48/48/0316G32/017/
R-CTD PK WND 0334/0908/ 8/72/ 70006 53005 10052 20049

10 A.M.
Weather: Scattered stratus fractus, overcast nimbostratus, light drizzle
Temperature: 50F; Dew Point: 50F; Wind: NNE at 18G32 kts,
Peak wind: 39 MPH (34 kts) N at 9:18 A.M.
Sea-level pressure: 30.15 ins. Hg, rising, then falling
Visibility: 10 miles, except 40 miles SN-NW
3-hr Precip: 0.22 ins.
BHO SA 1455 15 SCT E60 OVC 10L- 210/50/50/0318G32/015/
VSBY 40 SW-NW L-CTD PK WND 0334/18 8/72/ 6022/ 58007

1 P.M.
Weather: Scattered stratus fractus, overcast nimbostratus, light rain
Temperature: 49F; Dew Point: 49F; Wind: NNE at 19G30 kts,
Peak wind: 39 MPH (34 kts) N at 12:26 P.M.
Sea-level pressure: 30.16 ins. Hg, rising steadily
Visibility: 3 miles, fog
6-hr Max temp: 51F
6-hr Min temp: 48F
6-hr Precip: 0.45 ins.
BHO SA 1755 15 SCT E60 OVC 3R-F 213/49/49/0219G30/016/
R-CTD PK WND 02034/26/ 8/72/ 6045/ 53003 10051 20048

SUMMARY FOR THURSDAY, OCTOBER 10, 2019

TEMPERATURE (DEGREES F)
MAX…..54   NORMAL…..62
MIN…..47   NORMAL…..45
MEAN….51   NORMAL…..54

DEPARTURE FROM 30-YEAR NORMAL………………….-3
TOTAL DEPARTURE FOR THE MONTH………………….-5 [-0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………14   DEPARTURE………+2
TOTAL HEATING UNITS FOR THE MONTH…………..103   DEPARTURE…….. +3
TOTAL HEATING UNITS FOR THE SEASON………….196   DEPARTURE……..-47
TOTAL HEATING UNITS LAST SEASON TO DATE……..139   DEPARTURE……..+57

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….0
TOTAL COOLING UNITS FOR THE MONTH……………2   DEPARTURE………-1
TOTAL COOLING UNITS FOR THE SEASON…………682   DEPARTURE……..+82
TOTAL COOLING UNITS LAST SEASON TO DATE…….865   DEPARTURE…….-183

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..41 NE   AT  6:32 P.M.
AERO…………………….37 NE   AT  6:32 P.M.
ASOS…………………….41 NE   AT  6:32 P.M.
DAVIS……………………40 ENE  AT  6:30 P.M. RMY 42
FASTEST MILE FOR YESTERDAY………………….M
MAXIMUM 2-MINUTE ASOS AVERAGE……………….26 NE   AT  11:52 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………28 NE   AT  11:51 P.M.
AVERAGE WIND SPEED AND DIRECTION…………….18.8 NNE
ASOS…………………….17.6 NE
DAVIS……………………18.4 NE [40 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.06  DEPARTURE……-0.09
ASOS…………..0.06
TOTAL PRECIPITATION FOR THE MONTH……….1.03  DEPARTURE……-0.45
ASOS…………..1.02
TOTAL PRECIPITATION FOR THE YEAR……….39.45  DEPARTURE……-1.12
ASOS………….39.25

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/01  73/56/65/-3/0.00/703/89                21 ENE AERO 14 ENE RMY 18
9/02  75/57/66/-2/0.37/165/21                39 W   AERO 41 W   RMY 41
9/03  77/61/69/+2/0.00/643/82                18 S   AERO 16 S   RMY N/A
9/04  83/61/72/+5/0.00/375/48                30 SW  AERO 28 SW  RMY 30
9/05  68/54/61/-6/0.00/513/66                23 NW  AERO 17 NW  RMY N/A
9/06  65/56/61/-6/0.03/054/07                37 ENE AERO 36 ENE RMY 36
9/07  70/51/61/-5/0.27/325/42                37 N   AERO 37 N   RMY N/A
9/08  73/53/63/-3/0.00/631/82                25 W   AERO 21 W   RMY N/A
9/09  71/54/63/-3/0.00/537/70                17 SE  AERO 16 SE  RMY 16
9/10  73/57/65/0/0.00/207/27                 25 S   AERO 25 S   RMY N/A
9/11  83/63/73/+8/0.00/419/55                31 SW  AERO 32 SW  RMY N/A
9/12  70/52/61/-4/0.11/015/02                29 ENE AERO 28 ENE RMY 28
9/13  65/49/57/-7/0.00/741/98                29 ENE AERO 27 ENE RMY 27
9/14  69/49/59/-5/0.19/030/04                36 S   AERO 37 S   RMY 37
9/15  78/62/70/+6/0.00/600/80                24 W   AERO 23 W   RMY 22
9/16  72/54/63/0/T/673/90                    25 WNW AERO 23 WNW RMY 25
9/17  67/49/58/-5/0.00/611/82                23 NW  AERO 23 N   RMY N/A
9/18  61/49/55/-7/0.00/579/78                26 NE  AERO 25 NE  RMY 25
9/19  67/43/55/-7/0.00/709/96                17 NE  AERO 18 NE  RMY N/A
9/20  78/50/64/+2/0.00/677/92                21 W   AERO 18 W   RMY 20
9/21  83/60/72/+11/0.00/689/94               21 WNW AERO 18 WNW RMY N/A
9/22  85/62/74/+13/0.00/687/94               24 SW  AERO 23 SW  RMY 25
9/23  88/65/77/+17/0.00/539/74               29 SSW AERO 28 SSW RMY 29
9/24  76/56/66/+6/0.04/616/85                26 W   AERO 26 W   RMY 27
9/25  73/50/62/+2/0.00/686/95                22 W   AERO 21 W   RMY 21
9/26  79/55/67/+8/0.25/388/54                38 SW  AERO 37 SW  RMY 39
9/27  72/50/61/+2/0.00/695/97                23 S   AERO 23 S   RMY 22
9/28  78/55/67/+9/0.00/664/93                31 S   AERO 29 S   RMY 30
9/29  75/53/64/+6/0.00/619/87                24 NW  AERO 23 NW  RMY 23
9/30  62/49/56/-2/0.00/609/86                23 NNE AERO 16 NNE RMY N/A

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/…/..               28 SW  AERO 25 SSW RMY 29
10/02  74/49/62/+5/0.42/…/..               30 ENE AERO 25 ENE RMY 28
10/03  51/46/49/-7/…./…/..               28 ENE AERO 26 ENE RMY N/A
10/04  59/40/50/-6/…./…/..               38 NNW AERO 38 NNW RMY 38
10/05  58/35/47/-9/0.00/…/..               21 N   AERO 18 SSW RMY N/A
10/06  65/44/55/0/0.00/…/..                36 SSW AERO 35 SSW RMY N/A
10/07  77/57/67/+12/0.12/…/..              47 SSW AERO 46 SSW RMY 49
10/08  60/52/56/+2/T/…/..                  22 NE  AERO 18 NW  RMY N/A
10/09  55/49/52/-2/…./…/..               43 NE  AERO 37 NE  RMY 44
10/10  54/47/51/-3/…./…/.. 41 NE  AERO 37 NE  RMY 42

The low since midnight is 48F, normal daily minimum is 45F

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

RECORDS FOR OCTOBER 11
HIGH 80F IN 1919,1949
LOW 28F IN 1993
PRECIP 0.96 INCHES IN 1903
SNOWFALL (NONE)
PEAK GUST 66e MPH WNW IN 1941

RECORDS FOR OCTOBER 12
HIGH 87F IN 1954
LOW 31F IN 1906
PRECIP 1.53 INCHES IN 1948
SNOWFALL TRACE IN 1941
PEAK GUST 55 MPH NW IN 1963

TODAY’S REPORT PREPARED BY: Andrew Swanson & Benjamin Turner

Category: Daily Discussions

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