Monday, October 30, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, OCTOBER 30, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

LOW PRESSURE BRINGS RECORD BREAKING HIGH WINDS AND
VERY HEAVY RAINFALL OVERNIGHT

Winds from the SSE started to pick up yesterday
evening and continued gusting over 50 MPH throughout
the day. We have had a peak gust so far today of 63 kts
(74 MPH) early this morning, which breaks the daily record
of 66 MPH set back in 1963.  The peak gust for Sunday of
54 kts (62 mph) from the ESE came just before midnight
and was not a record. Overnight we had heavy rains, which
left 3.11 inches of precipitation since last evening. This
brings the monthly total rainfall close to six inches.
After falling rapidly last evening, the pressure has been
rising, at some points rapidly, since 4:00 AM EST from a
minimum value near 29.05 inches as the storm center passed.
This is one of the lowest sea-level pressures ever observed
during October at Blue Hill. Temperatures remained above
seasonable overnight with the southerly winds. We had an
overnight low of 59F which is 20 degrees above the normal
daily low of 39F. Today temperatures returned to more
seasonable values with a maximum temperature of 59F by
1:00 P.M. EST. The normal daily max is 56F.

Today’s Observations:

7 A.M.
Weather: Light rain, scattered stratus fractus, broken altocumulus
Temperature: 59F; Dew Point: 59F; Wind: S at 25G28 kts,
Peak Wind: 40 kts (46 MPH) at 7:13 A.M. EST
Sea-level pressure: 29.08 ins. Hg, rising, then more slowly
Visibility: 30 miles, 15 miles N
6-hr Max temp: 63F
6-hr Min temp: 59F
24-hr precip: 3.12 ins.
BHO SA 1155 17 SCT E80 BKN 30R- 848/59/59/1725G28/908/ VSBY N 15 DSNT
FG N PK WND 1740/13/ 8/780 51021 MANUAL 70312 ASOS 70314 10063 20059

10 A.M.
Weather: Overcast Stratus with a break in overcast N
Temperature: 55F; Dew Point: 47F; Wind: S at 23G37 kts,
Peak Wind: 41 kts (47 MPH) at 10:12 A.M. EST
Sea-level pressure: 29.12 ins. Hg, rising, then more slowly
Visibility: 50 miles, 30 miles S-SSW  distant fog S-W
3-hr precip: Trace
BHO SA 1455 E30 OVC 50 862/55/47/19/1923G37/912 / BINOVC NNE VSBY
SW-W 30 VIRGA S–SSW DSNT FG S-W PK WND 1941/12/ 8/6/// 51014 MANUAL
6000/ ASOS 60001

1 P.M.
Weather: Scattered stratocumulus
Temperature: 51F; Dew Point: 37F; Wind: WSW at 25G38 kts,
Peak Wind: WSW 44 kts (51 MPH) at 12:03 P.M. EST
Sea-level pressure: 29.37 ins. Hg, rising, then more quickly
Visibility: 50 miles
6-hr Max temp: 59F
6-hr Min temp: 50F
6-hr precip: Trace
BHO SA 1755 E35 BKN 50 947/51/37/2525G38/937/ PRESRR/ PK WND 2544/03/
8/500 51085 MANUAL 6000/ ASOS 60001 10059 20050

SUMMARY FOR SUNDAY, OCTOBER 29, 2017

TEMPERATURE (DEGREES F)
MAX…..62   NORMAL…..56
MIN…..55   NORMAL…..39
MEAN….59   NORMAL…..47

DEPARTURE FROM 30-YEAR NORMAL……………………+12
TOTAL DEPARTURE FOR THE MONTH…………………..+251 [+8.5 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH…………..24   DEPARTURE………+19
TOTAL COOLING UNITS FOR THE SEASON…………731   DEPARTURE……..+129
TOTAL COOLING UNITS LAST SEASON TO DATE…….901   DEPARTURE……..-170

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………6   DEPARTURE………-12
TOTAL HEATING UNITS FOR THE MONTH………….151   DEPARTURE……..-234
TOTAL HEATING UNITS FOR THE SEASON…………244   DEPARTURE……..-283
TOTAL HEATING UNITS LAST SEASON TO DATE…….387   DEPARTURE……..-143

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….62 ESE  AT  11:37 P.M.
AERO……………………63 ESE  AT  11:38 P.M.
ASOS……………………63 ESE  AT  10:42 P.M.
DAVIS…………………..64 ESE  AT  10:41 P.M.  RMY N/A
FASTEST MILE FOR YESTERDAY…………………46 ESE  AT  11:37 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………39 ESE  AT  11:45 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..44 ESE  AT  11:21 P.M.
AVERAGE WIND SPEED AND DIRECTION………….18.0 ESE
ASOS………………….16.7
DAVIS…………………16.7 SE  [132 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….3.12  DEPARTURE……+2.96
ASOS…………..3.14
TOTAL PRECIPITATION FOR THE MONTH……….5.94  DEPARTURE……+1.56
ASOS…………..6.07
TOTAL PRECIPITATION FOR THE YEAR……….47.80  DEPARTURE……+4.34
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/-3/0.00/697/99             18 WNW AERO 16 NW  RMY N/A
10/2  65/46/56/-1/0.00/687/98             21 NNW AERO 21 NNW RMY 21
10/3  67/50/59/+3/0.00/677/97             21 S   AERO 21 S   RMY N/A
10/4  75/50/63/+7/0.00/660/95             30 SSW AERO 30 SW  RMY 32
10/5  79/60/70/+14/0.00/429/62            28 SW  AERO 26 SW  RMY N/A
10/6  73/57/65/+10/T/352/51               15 NW  AERO 14 NW  RMY 15
10/7  75/59/67/+12/T/344/50               29 S   AERO 30 SSW RMY N/A
10/8  71/67/69/+15/0.23/007/01            33 S   AERO 36 SSW RMY 37
10/9  71/68/70/+16/0.22/000/00            43 S   AERO 41 S   RMY 45
10/10 76/61/69/+15/0.00/637/94            21 WNW AERO 20 WNW RMY 21
10/11 68/55/62/+9/0.00/122/18             29 ENE AERO 25 ENE RMY 29
10/12 58/48/50/0/T/169/25                 30 NE  AERO 28 ENE RMY 30
10/13 64/48/56/+3/0.00/545/81             20 E   AERO 16 E   RMY 17
10/14 66/54/60/+8/…/637/94              15 SSE AERO 13 SSE RMY 13
10/15 72/58/65/+13/…/067/10             39 SSW AERO 36 SSW RMY 40
10/16 66/39/53/+2/…/146/22              28 NNW AERO 25 NNW RMY 29
10/17 57/35/46/-5/0.00/007/01             25 S   AERO 22 S   RMY 25
10/18 70/45/58/+7/0.00/659/100            25 SW  AERO 23 SW  RMY 22
10/19 72/52/62/+12/0.00/649/99            31 SSW AERO 30 SSW RMY 32
10/20 68/53/61/+11/0.00/…/..            28 WNW AERO 25 WNW RMY 29
10/21 77/52/65/+15/0.00/…/..            21 NW  AERO 20 NW  RMY 18
10/22 73/54/64/+15/0.00/…/..            21 ENE AERO 16 ENE RMY 17
10/23 69/50/60/+11/0.00/…/..            24 SSE AERO 24 SSE RMY N/A
10/24 73/64/69/+20/…/…/..             50 SSE AERO 51 S   RMY N/A
10/25 69/57/63/+14/…/…/..             50 SSW AERO 50 SSW RMY N/A
10/26 60/44/52/+4/…/…/..              40 W   AERO 41 W   RMY 39
10/27 60/42/51/+3/0.00/…/..             28 W   AERO 25 W   RMY N/A
10/28 66/47/57/+9/0.00/…/..             24 S   AERO 23 S   RMY 26
10/29 62/55/59/+12/…/…/..             62 ESE AERO 63 ESE RMY N/A

10/29 Low temp since midnight is 59F; normal low is now 39F

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

10/24/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 64F,
BREAKS PREVIOUS RECORD OF 61F SET IN 2001

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

RECORDS FOR OCTOBER 30
HIGH 75F IN 1946,1989
LOW 21F IN 1928
PRECIP 1.85 INCHES IN 1917
SNOWFALL 2.0 INCHES IN 2011
PEAK GUST 66 NW IN 1963

RECORDS FOR OCTOBER 31
HIGH 79F IN 1946
LOW 22F IN 1904
PRECIP 3.74 INCHES IN 1991
SNOWFALL TRACE IN 1906
PEAK GUST 70e S IN 1945

TODAY’S REPORT PREPARED BY: Kaitlin Ann Geagan / Afshin Pourmokhatarian