Thursday, October 11, 2018

| October 11, 2018 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, OCTOBER 11, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST AND FOGGY WITH DECREASING TEMPERATURES
IN THE AFTERNOON….

Pressure has decreased by over 5 mb between the 7 A.M.
and the 1 P.M. observations. Winds have also shifted from
S to NE shortly after 1 P.M. Fog has limited visibility to
5 miles throughout the day. Temperatures have increased to
70F so far today. This is 8 degrees above the normal maximum
of 62F. Before the wind shift, temperatures decreased from
70F to 62F around noontime. The low since midnight is 62F,
which is 17 degrees above our normal low of 45F.

PRELIMINARY STATS FOR SEPTEMBER 2018

TEMPERATURE, Deg. F
Avg. Max. 72.5 [+0.9]
Avg. Min. 58.6 [+4.0]
Mean 65.6 [+2.5]
24-hour corrected mean: 64.8
Max. for month: 92F on 3rd, 6th
Min. for month: 47F on 23rd

HEATING DEGREE DAYS
Total heating units: 87 [-30]
Total for the season: 87 [-55]
Total for last season: 93

COOLING DEGREE DAYS
Total cooling units: 110 [+50]
Total for the season: 863 [+266]
Total for last season: 707

PRECIPITATION, Inches
Total: 9.13 [+5.07]
Greatest in 24 hrs: 3.32 ins. on the 18th-19th

WIND, mph
Avg. uncorrected wind speed: 9.4
Avg. corrected wind speed: 10.1
Prevailing wind direction: NE [12% of total hours]
Peak gust and direction: 37 SSW

SUNSHINE:
Campbell-Stokes card minutes: 7608 minutes of possible 21582 or 35%
Astronomical total minutes: 7924 minutes of possible 22447 or 35%

BHO Lowest September Sunshine, hours (1886-2018):
1) 120.7 in 1934  [34%]
2) 126.8 in 2018  [35%]
3) 130.8 in 1889  [36%]
4) 131.1 in 1996  [36%]
5) 133.0 in 1907  [37%]

BHO Wettest Septembers, inches (1886-2018):
1) 12.37 in 1999
2) 11.04 in 1933
3) 10.23 in 1896
4) 10.00 in 1961
5) 9.62 in 1987
6) 9.58 in 1888
7) 9.36 in 1918
8) 9.13 in 2018
9) 8.81 in 1907
10) 8.78 in 1996

Today’s Observations:

7 A.M.
Weather: Fog
Temperature: 65F; Dew Point: 65F; Wind: S at 6 kts,
Wind: Light
Sea-level pressure: 29.83 ins. Hg, falling steadily
Visibility: 1/2 mile, fog
6-hr Max temp: 67F
6-hr Min temp: 64F
24-hr Precip: 0.00 ins.
BHO SA 1155 W3 X 1/2F 103/65/65/1706/983/ WND LGT/ 8////
56008 10067 20064

10 A.M.
Weather: Overcast stratocumulus, few stratus fractus
in all directions
Temperature: 69F; Dew Point: 66F; Wind: S at 6 kts,
Wind: Light
Sea-level pressure: 29.79 ins. Hg, falling rapidly
Visibility: 5 miles, fog
3-hr Precip: 0.00 ins.
BHO SA 1455 E15 OVC 5F 087/69/66/1806/979/ FEW STFA ALQDS
WND LGT/ 8/4// 58016

1 P.M.
Weather: Overcast stratus
Temperature: 62F; Dew Point: 61F; Wind: NE at 8 kts
Sea-level pressure: 29.73 ins. Hg, falling rapidly
Visibility: 5 miles, fog
6-hr Max temp: 70F
6-hr Min temp: 62F
6-hr Precip: 0.00 ins.
BHO SA 1755 E15 OVC 5F 069/62/61/0408/973/ 8/6// 58028
10070 20062

SUMMARY FOR WEDNESDAY, OCTOBER 10, 2018

TEMPERATURE (DEGREES F)
MAX…..82   NORMAL…..62
MIN…..65   NORMAL…..45
MEAN….74   NORMAL…..54

DEPARTURE FROM 30-YEAR NORMAL………………….+20
TOTAL DEPARTURE FOR THE MONTH………………….+55 [+5.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……..-12
TOTAL HEATING UNITS FOR THE MONTH…………..52   DEPARTURE……..-48
TOTAL HEATING UNITS FOR THE SEASON…………139   DEPARTURE…….-104
TOTAL HEATING UNITS LAST SEASON TO DATE…….121   DIFFERENCE…….+18

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………9  DEPARTURE……….+9
TOTAL COOLING UNITS FOR THE MONTH…………..11  DEPARTURE……….+7
TOTAL COOLING UNITS FOR THE SEASON…………874  DEPARTURE……..+273
TOTAL COOLING UNITS LAST SEASON TO DATE…….727  DIFFERENCE…….+147

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..24 WSW AT 1:58  P.M.
AERO…………………….23 WSW AT 1:57  P.M.
ASOS…………………….25 SW  AT 1:55  P.M.
DAVIS……………………25 W   AT 1:18  P.M. RMY 25
FASTEST MILE FOR YESTERDAY………………….18 SW  AT 1:20  P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 SW  AT 1:39  P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………19 W   AT 1:19  P.M.
AVERAGE WIND SPEED AND DIRECTION…………..12.6 WSW
ASOS…………………..12.5
DAVIS………………….12.7 WSW [245 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.40  DEPARTURE……-0.08
ASOS…………..1.40
TOTAL PRECIPITATION FOR THE YEAR……….48.48  DEPARTURE……+8.10
ASOS………….50.32

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 75/58/67/-1/0.00/521/66        17 NE  AERO 15 NE  RMY 16
9/02 83/61/72/+4/0.00/684/87        20 SSW AERO 18 SSW RMY N/A
9/03 92/68/80/+13/0.00/650/83       24 WSW AERO 22 WSW RMY 25
9/04 88/70/79/+12/0.00/695/89       17 W   AERO 16 W   RMY 17
9/05 89/67/78/+11/0.00/638/82       23 SSW AERO 23 SSW RMY 25
9/06 92/70/81/+14/0.56/488/63       29 NNW AERO 29 NNW RMY N/A TSTM
9/07 70/63/67/+1/0.01/000/00        24 NE  AERO 22 NE  RMY N/A
9/08 68/54/61/-5/0.00/031/04        22 NE  AERO 18 NE  RMY 21
9/09 61/53/57/-9/0.00/000/00        23 NE  AERO 21 NE  RMY N/A
9/10 62/56/59/-6/…./000/00        30 E   AERO 28 E   RMY 28
9/11 75/61/68/+3/…./000/00        23 E   AERO 21 E   RMY N/A TSTM
9/12 69/63/66/+1/…./000/00        21 ENE AERO 21 ENE RMY 21  TSTM
9/13 68/62/65/+1/…./091/12        21 NE  AERO 21 NE  RMY N/A TSTM
9/14 75/61/68/+4/…./233/31        13 NE  AERO 12 ENE RMY 12
9/15 76/62/69/+5/0.01/218/29        14 SW  AERO 13 SW  RMY 13
9/16 84/61/73/+10/…./695/93       15 S   AERO 14 S   RMY N/A
9/17 82/64/73/+10/…./372/50       22 SSW AERO 22 SSW RMY N/A
9/18 74/67/71/+9/…./000/00        31 SSW AERO 30 SSW RMY N/A TSTM
9/19 66/57/62/0/…./007/01         28 NE  AERO 25 NE  RMY 26
9/20 63/55/59/-3/…./110/15        22 NE  AERO 21 NE  RMY 19
9/21 70/55/63/+2/…./352/48        37 SSW AERO 37 SSW RMY 41
9/22 70/51/61/0/…./175/24         37 SW  AERO 36 SW  RMY 30
9/23 60/47/54/-6/…./058/08        14 N   AERO 13 N   RMY N/A
9/24 55/50/53/-7/…./000/00        37 ENE AERO 35 ENE RMY 35
9/25 68/51/60/0/…./000/00         36 SE  AERO 37 SE  RMY 38
9/26 79/66/73/+14/…./244/34       35 SSW AERO 37 SSW RMY 37
9/27 66/56/61/+2/…./465/65        26 NNE AERO 25 NNE RMY 28
9/28 56/52/54/-4/…./029/04        24 NNE AERO 21 NNE RMY 23
9/29 71/50/61/+3/…./518/73        20 NW  AERO 18 NW  RMY 20
9/30 68/48/58/0/…./650/92         20 W   AERO 16 W   RMY N/A

DAILY RECORDS FOR SEPTEMBER

09/04/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 70F,
BREAKS PREVIOUS RECORD OF 68F SET IN 1937 AND 1959

09/06/18: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 92F,
TIES PREVIOUS RECORD OF 92F SET IN 1900

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 65/53/59/+2/…./…/..         21 ENE AERO 18 SSW RMY N/A
10/02 64/53/59/+2/…./…/..         33 S   AERO 32 S   RMY 35 TSTM
10/03 60/52/56/0/…./…/..          18 NNE AERO 14 NNE RMY 14
10/04 69/57/63/+7/…./…/..         29 SSW AERO 29 SSW RMY 32
10/05 64/47/56/0/…./…/..          25 NE  AERO 21 NE  RMY 24
10/06 64/45/55/0/0.00/…/..          23 SSW AERO 23 SSW RMY 25
10/07 75/56/66/+11/…./…/..        28 NE  AERO 24 ENE RMY 27
10/08 56/53/55/+1/…./…/..         22 ENE AERO 20 ENE RMY N/A
10/09 75/56/66/+12/…./…/..        26 WSW AERO 28 SW  RMY 29
10/10 82/65/74/+20/…./…/..        24 WSW AERO 23 WSW RMY 25

10/11 Low temp since midnight is 64F; normal low 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: Benjamin Turner

 

Category: Daily Discussions

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