Wednesday, October 9, 2019

| October 9, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, OCTOBER 9, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

WINDY AND COOL WITH LIGHT RAIN ATOP GREAT
BLUE HILL….

We observed a visibility decrease from 85 miles this morning
to 25 miles this afternoon due to fog. Skies were overcast,
and light rain began to fall around 9 A.M. By 1 P.M., only
0.02 inches were measured. Wind has been strong and northeasterly,
with frequent gusts above 20 mph. The highest gust so far today
is around 37 mph.

The strong cold air advection and cloudy skies have kept temperatures
well below seasonal averages. The high so far today is 55F, which is
8 degrees below the normal high of 63F. The low this morning was 52F,
which is 6 degrees above the daily normal minimum of 46F. This continues
the trend of higher than normal overnight temperatures and lower than
normal maximum temperatures seen this month.

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: Broken stratocumulus, broken altostratus
Temperature: 54F; Dew Point: 46F; Wind: NE at 13G21 kts,
Peak wind: 32 MPH (28 kts) NE at 5:42 A.M.
Sea-level pressure: 30.29 ins. Hg, rising then steady
Visibility: 85 miles
6-hr Max temp: 54F
6-hr Min temp: 52F
24-hr Precip: Trace
BHO SA 1155 E60 BKN 120 BKN 85 026/54/46/0513G21/029/ PK WND 0428/1042/
8/470 53008 10054 20052

10 A.M.
Weather: Scattered stratus fractus, overcast nimbostratus,
break in overcast NW, very light rain
Temperature: 55F; Dew Point: 47F; Wind: NE at 16G27 kts,
Peak wind: 37 MPH (32 kts) NE at 8:54 A.M.
Sea-level pressure: 30.33 ins. Hg, rising, then rising more slowly
Visibility: 40 miles, distant fog
3-hr Precip: Trace
BHO SA 1455 40 SCT E120 OVC 40R- 037/55/47/0516G27/033/ DSNT FG ALQDS
BINOVC NW R-CTD PCPN VRY LGT PK WND 0532/1354/ 8/72/ 600// 53011

1 P.M.
Weather: Broken stratus fractus, overcast nimbostratus,
light rain
Temperature: 53F; Dew Point: 48F; Wind: NE at 15G23 kts,
Peak wind: 32 MPH (28 kts) NE at 12:42 P.M.
Sea-level pressure: 30.30 ins. Hg, falling, then falling more rapidly
Visibility: 25 miles due to fog, except 70 miles to the NW
6-hr Max temp: 55F
6-hr Min temp: 52F
6-hr Precip: 0.02 ins.
BHO SA 1755 E30 BKN 110 OVC 25R- 029/53/48/0515G23/030/ DSNT FG ALQDS
VSBY 70 NW R-CTD PK WND 0528/42/ 8/72/ 6002/ 57008 10055 20052

SUMMARY FOR TUESDAY, OCTOBER 8, 2019

TEMPERATURE (DEGREES F)
MAX…..60   NORMAL…..63
MIN…..52   NORMAL…..46
MEAN….56   NORMAL…..54

DEPARTURE FROM 30-YEAR NORMAL………………….+2
TOTAL DEPARTURE FOR THE MONTH…………………..0 [-0.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………9   DEPARTURE………-2
TOTAL HEATING UNITS FOR THE MONTH…………..76   DEPARTURE…….. -1
TOTAL HEATING UNITS FOR THE SEASON…………169   DEPARTURE……..-51
TOTAL HEATING UNITS LAST SEASON TO DATE…….139   DEPARTURE……..+30

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…….864   DEPARTURE…….-182

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..22 NE   AT 10:37 P.M.
AERO…………………….18 NW   AT  3:02 A.M.
ASOS…………………….22 NE   AT 10:39 P.M.
DAVIS……………………21 NE   AT  8:37 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….15 NE   AT 11:06 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….15 NE   AT 11:25 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………15 NE   AT  8:35 P.M.
AVERAGE WIND SPEED AND DIRECTION……………..8.2 NE
ASOS……………………..8.6
DAVIS…………………….8.4 NNE [27 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…Trace  DEPARTURE……-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.71  DEPARTURE……-0.48
ASOS…………..0.69
TOTAL PRECIPITATION FOR THE YEAR……….39.13  DEPARTURE……-1.15
ASOS………….38.92

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/+11/0.00/711/97               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  The low since midnight is 52F, 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 9
HIGH 82F IN 2011
LOW 29F IN 1907,1937
PRECIP 2.54 INCHES IN 1976
SNOWFALL 0.2 INCHES IN 1888
PEAK GUST 81e MPH S IN 1976 (RECORD FOR MONTH)

RECORDS FOR OCTOBER 10
HIGH 85F IN 1949
LOW 27F IN 1929
PRECIP 2.02 INCHES IN 1998
SNOWFALL 6.8 INCHES IN 1979 (RECORD FOR MONTH)
PEAK GUST 59 MPH WNW IN 1958

TODAY’S REPORT PREPARED BY: Benjamin Turner and Greg White

Category: Daily Discussions

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