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Tuesday, October 8, 2019

October 8, 2019

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, OCTOBER…

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, OCTOBER 8, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

BACK TO REALITY, CLOUDY AND COOL FOLLOWING A WARM DAY….

The warm temperatures of yesterday are but a mere memory today
as cloudy and cool conditions have dominated today. A cold front
passed through the region last evening bringing with it 0.12 inches
of rain. Temperatures dropped 9 degrees in 1 hour between 8 and 9
P.M. marking the end of the warm air mass.

A few light rain showers this morning only amounted to a trace.

The high so far today is 60F, which is 3 degrees below the normal
high of 63F. The low this morning was a toasty 53F, which is 7
degrees above the daily normal minimum of 46F.

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: N/A
Astronomical total minutes:   N/A

Today’s Observations:

7 A.M.
Weather: Overcast altostratus, few stratus fractus distant ESE-SSE
Temperature: 54F; Dew Point: 52F; Wind: NNW at 7 kts
Sea-level pressure: 30.25 ins. Hg, rising then steady
Visibility: 70 miles
6-hr Max temp: 57F
6-hr Min temp: 53F
24-hr Precip: 0.12 ins.
BHO SA 1155 E90 OVC 70 243/54/52/3407/025/ FEW STRAFRA DSNT
ESE-SSE PTCHY GF ALQDS/ 8/72/ 51013 70012 10057 20053

10 A.M.
Weather: Overcast altostratus, few break in overcast distant WNW-N,
few stratus fractus all quadrants, few cumulus distant WNW-NNW
Temperature: 57F; Dew Point: 54F; Wind: N at 6 kts
Sea-level pressure: 30.28 ins. Hg, rising, then rising more slowly
Visibility: 60 miles
3-hr Precip: Trace
BHO SA 1455 E140 OVC 60 254/57/54/3506/028/ FEW BINOVC DSNT
WNW-N FEW STRAFRA ALQDS FEW CU DSNT WNW-NNW VIRGA
N-NE WND L/V/ 8/72/ 51011 6000

1 P.M.
Weather: Scattered altocumulus, Overcast altostratus, few breaks in
overcast distant WNW-N, few stratocumulus all quadrants
Temperature: 60F; Dew Point: 52F; Wind: NE at 6kts
Sea-level pressure: 30.26 ins. Hg, falling, then falling more rapidly
Visibility: 70 miles
6-hr Max temp: 60F
6-hr Min temp: 53F
6-hr Precip: Trace
BHO SA 1755 140 SCT E170 OVC 70 246/60/52/0406/026/ FEW BINOVC
DSNT WNW-N FEW SC ALQDS WND LGT/ 8/52/ 58008 6000 10060 20054

SUMMARY FOR MONDAY, OCTOBER 7, 2019

TEMPERATURE (DEGREES F)
MAX…..77   NORMAL…..63
MIN…..57   NORMAL…..46
MEAN….67   NORMAL…..55

DEPARTURE FROM 30-YEAR NORMAL………………….+12
TOTAL DEPARTURE FOR THE MONTH………………….-2 [-0.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….. 0   DEPARTURE……..-11
TOTAL HEATING UNITS FOR THE MONTH…………..67   DEPARTURE…….. +1
TOTAL HEATING UNITS FOR THE SEASON…………160   DEPARTURE……..-49
TOTAL HEATING UNITS LAST SEASON TO DATE…….129   DEPARTURE……..+31

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………2   DEPARTURE………+2
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…….863   DEPARTURE…….-181

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..47 SSW  AT 12:45 P.M.
AERO…………………….46 SSW  AT 12:45 P.M.
ASOS…………………….50 SSW  AT 12:00 P.M.
DAVIS……………………46 SW   AT 12:42 P.M. RMY 49
FASTEST MILE FOR YESTERDAY………………….42 SSW  AT 11:59 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….37 SSW  AT 12:00 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………35 SSW  AT 11:58 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….19.3 SSW
ASOS…………………….17.9
DAVIS……………………18.1 SSW [212 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.12  DEPARTURE……-0.03
ASOS…………..0.11
TOTAL PRECIPITATION FOR THE MONTH……….0.71  DEPARTURE……-0.33
ASOS…………..0.69
TOTAL PRECIPITATION FOR THE YEAR……….39.13  DEPARTURE……-1.00
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  The low since midnight is 53F, normal daily minimum is 46F

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

RECORDS FOR OCTOBER 8
HIGH 81F IN 1916,1990
LOW 28F IN 1919
PRECIP 2.31 INCHES IN 1891
SNOWFALL TRACE IN 1988, 2001 (EARLIEST DATE)
PEAK GUST 60 MPH NE IN 1996

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)

TODAY’S REPORT PREPARED BY: Matt Douglas

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