Wednesday, October 11, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, OCTOBER 11, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

MOSTLY CLOUDY DAY WITH CLOSER TO SEASONABLE TEMPERATURES

Yesterday we had a high of 76F, which is 14 degrees above the
normal  of 62F for October 10th. Today the temperatures reached
68F which is still 6 degrees above normal making the day above
normal. A distant fog/haze reduced visibility today to 50-60
miles. Winds began the day coming from the NW but shifted just
after 7:00 AM EST to the NE. We also saw a slight increase in
gusts after the shift.

Today remained mostly cloudy with a mixture of altocumulus
and stratus clouds.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, broken cirrostratus,
few altocumulus ENE-SSE
Temperature: 60F; Dew Point: 55F; Wind: N at 8 kts
Sea-level pressure: 30.18 ins. Hg, rising, then more rapidly
Visibility: 50 miles, distant fog SSE-NNE
6-hr Max temp: 61F
6-hr Min temp: 59F
24-hr precip: 0.00 in.
BHO SA 1155 180 SCT E250 BKN 50 216/60/55/3508/018/ FEW AC ENE-SSE DSNT
FG SSE-NNE/ 8/096 53020 10061 20059

10 A.M.
Weather: Scattered altocumulus, broken altostratus
Temperature: 62F; Dew Point: 50F; Wind: NE at 10 kts
Sea-level pressure: 30.19 ins. Hg, rising then steady
Visibility: 60 miles, distant haze in all directions
BHO SA 1455 180 SCT E200 BKN 60 225/62/50/0510/019/ DSNT HZ ALQDS
8/070 51009

1 P.M.
Weather: Broken Stratus, broken altocumulus
Temperature: 64F; Dew Point: 52F; Wind: ENE AT 10 kts
Sea-level pressure: 30.19 ins. Hg, falling then steady
Visibility: 55 miles, distant haze in all directions
6-hr Max temp: 68F
6-hr Min temp: 60F
BHO SA 1755 E60 BKN E170 BKN 55 224/64/52/0610/019/ DSNT HZ ALQDS/
8/630 58001 10068 20060

SUMMARY FOR TUESDAY, OCTOBER 10, 2017

TEMPERATURE (DEGREES F)
MAX…..76   NORMAL…..62
MIN…..61   NORMAL…..45
MEAN….69   NORMAL…..54

DEPARTURE FROM 30-YEAR NORMAL……………………+15
TOTAL DEPARTURE FOR THE MONTH……………………+88 [+8.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………4   DEPARTURE……….+4
TOTAL COOLING UNITS FOR THE MONTH…………..20   DEPARTURE………+16
TOTAL COOLING UNITS FOR THE SEASON…………727   DEPARTURE……..+126
TOTAL COOLING UNITS LAST SEASON TO DATE…….894   DEPARTURE……..-161

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-12
TOTAL HEATING UNITS FOR THE MONTH…………..28   DEPARTURE………-72
TOTAL HEATING UNITS FOR THE SEASON…………121   DEPARTURE……..-122
TOTAL HEATING UNITS LAST SEASON TO DATE…….160   DEPARTURE………-39

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….21 WNW AT 2:47 P.M.
AERO……………………20 NW  AT 4:28 A.M.
ASOS……………………21 WNW AT 2:48 P.M.
DAVIS…………………..20 WNW AT 2:48 P.M.   RMY 21
FASTEST MILE FOR YESTERDAY…………………15 WNW AT 2:49 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………16 WNW AT 2:48 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..15 WNW AT 2:48 P.M.
AVERAGE WIND SPEED AND DIRECTION………….10.6 NW
ASOS………………….10.4
DAVIS…………………10.0 NW [309 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……….0.45  DEPARTURE……-1.03
ASOS…………..0.46
TOTAL PRECIPITATION FOR THE YEAR……….42.31  DEPARTURE……+1.75
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

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

10/1  65/42/54/-3/0.00/…/..               18 WNW AERO 16 NW  RMY N/A
10/2  65/46/56/-1/0.00/…/..               21 NNW AERO 21 NNW RMY 21
10/3  67/50/59/+3/0.00/…/..               21 S   AERO 21 S   RMY N/A
10/4  75/50/63/+7/0.00/…/..               30 SSW AERO 30 SW  RMY 32
10/5  79/60/70/+14/0.00/…/..              28 SW  AERO 26 SW  RMY N/A
10/6  73/57/65/+10/T/…/..                 15 NW  AERO 14 NW  RMY 15
10/7  75/59/67/+12/T/…/..                 29 S   AERO 30 SSW RMY N/A
10/8  71/67/69/+15/0.23/../..               33 S   AERO 36 SSW RMY 37
10/9  71/68/70/+16/0.22/../..               43 S   AERO 41 S   RMY 45
10/10 76/61/69/+15/0.00/../..               21 WNW AERO 20 WNW RMY 21
10/10 Low temp since midnight is 63F; normal low is now 45F

DAILY RECORDS FOR OCTOBER

10/8/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F,
BREAKS PREVIOUS RECORD OF 60F SET IN 1944

10/9/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 68F,
BREAKS PREVIOUS RECORD OF 61F SET IN 2011

10/9/17: MONTHLY RECORD HIGH MINIMUM TEMPERATURE OF 68F,
BREAKS PREVIOUS RECORD OF 67F SET ON OCTOBER 13, 1990
AND TIED ON OCTOBER 8, 2017

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: Kaitlin Geagan