Sunday, September 18, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 18, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

TRACE OF PRECIP BEFORE 1PM EST

Skies have been mostly cloudy all day, but no measurable precip has fallen as
of 1PM EST. Dew points increased to the upper 60s making for humid and hazy
conditions. Winds have increased ahead of the approaching cold front. The peak
gust for the day has been 26 kts (30 MPH) SSW at 9:49AM EST. Temperatures have
been above normal with a max of 79F and an overnight low of 63F, both above
the normals of 71F and 54F respectively.

7 A.M.
Weather: Few cumulus and cumulus fractus in all directions,
scattered altocumulus, broken cirrus
Temperature: 68F; Dew Point: 65F; Wind: SSW at 16G21 kts
Sea-level pressure: 30.06 ins. Hg, falling then rising
Visibility: 20 miles, except 15 miles NNW-NNE, distant fog
6-hr Max temp: 68F
6-hr Min temp: 64F
24-hr precip: 0.00 in.
BHO SA 1155 100 SCT E160 BKN 20 181/68/65/2016G21/006/ FEW CU AND CUFRA ALQDS
VSBY NNW-NNE 15 DSNT FG/ 8/762 53006 10068 20064

10 A.M.
Weather: Scattered cumulus, broken altocumulus, broken cirrus
Temperature: 77F; Dew Point: 66F; Wind: SW at 13G26 kts
Peak Wind: 26 kts (30 MPH) SSW at 9:49AM EST
Sea-level pressure: 30.06 ins. Hg, falling, then rising
Visibility: 35 miles, except 20 miles SW-NNE, distant fog
BHO SA 1455 25 SCT E130 BKN 250 BKN 35 181/77/66/2213G26/006/ VSBY SW-NNE 20
DSNT FG PK WND 2126/49/ 8/171 56000

1 P.M.
Weather: Scattered cumulus, broken altocumulus, overcast altostratus
Temperature: 79F; Dew Point: 67F; Wind: SSW at 13G25 kts
Sea-level pressure: 30.03 ins. Hg, falling, then more quickly
Visibility: 35 miles, distant fog
6-hr Max. temp: 79F
6-hr Min. temp: 68F
BHO SA 1755 24 SCT E84 BKN 130 OVC 35 171/79/67/2113G25/003/ DSNT FG/ 8/11/
58010 MANUAL 600// 10079 20068

SUMMARY FOR SATURDAY, SEPTEMBER 17, 2016

TEMPERATURE (DEGREES F)
MAX…..77   NORMAL…..71
MIN…..54   NORMAL…..54
MEAN….66   NORMAL…..63

DEPARTURE FROM 30-YEAR NORMAL……………………+3
TOTAL DEPARTURE FOR THE MONTH…………………..+48 [+2.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………1   DEPARTURE……….+1
TOTAL COOLING UNITS FOR THE MONTH…………..64   DEPARTURE………+18
TOTAL COOLING UNITS FOR THE SEASON…………856   DEPARTURE……..+273
TOTAL COOLING UNITS LAST SEASON TO DATE…….781   DIFFERENCE……..+75

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……….-4
TOTAL HEATING UNITS FOR THE MONTH……………6   DEPARTURE………-33
TOTAL HEATING UNITS FOR THE SEASON………….16   DEPARTURE………-48
TOTAL HEATING UNITS LAST SEASON TO DATE………6   DIFFERENCE……..+10

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….28 S   AT 11:06 P.M.
ASOS……………………28 SSW AT 11:07 P.M.
DAVIS…………………..27 S   AT 11:06 P.M. RMY 28
FASTEST MILE FOR YESTERDAY…………………21 S   AT 11:17 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………21 S   AT 11:11 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..20 S   AT 11:19 A.M.
AVERAGE WIND SPEED AND DIRECTION…………13.1 S
ASOS………………….13.4
DAVIS…………………12.2 S [190 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.31  DEPARTURE……-0.85
ASOS…………..1.30
TOTAL PRECIPITATION FOR THE YEAR……….26.28  DEPARTURE…..-10.90
ASOS………….26.57

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

9/1  72/64/68/0/0.09/000/00                  21 NNW AERO 16 NNW RMY 20
9/2  76/58/67/-1/0.00/738/94                 23 ENE AERO 17 NE  RMY 23
9/3  72/56/64/-3/0.00/368/47                 16 E   AERO 12 E   RMY N/A
9/4  71/58/65/-2/0.00/740/95                 28 NE  AERO 21 NE  RMY 27
9/5  73/57/65/-2/0.52/241/31                 42 NNE AER0 33 NNE RMY 43
9/6  70/61/66/-1/0.54/046/06                 32 N   AERO 23 NNE RMY N/A
9/7  78/66/72/+6/0.05/339/44                 21 NE* AERO 15 NE* RMY 21
9/8  79/65/72/+6/T/276/36                    22 S   AERO 15 S   RMY 23
9/9  90/69/80/+14/T/421/55                   23 W   AERO 24 W   RMY 25
9/10 82/71/77/+12/T/…/..                   25 S   AERO 18 S   RMY 32
9/11 79/59/69/+4/0.10/…/..                 39 WNW AERO 30 WNW RMY 43
9/12 76/53/65/0/0.00/…/..                  18 SW* AERO 13 WNW RMY 19
9/13 81/57/69/0/0.00/…/..                  25 SSW AERO  M     RMY 26
9/14 87/58/73/+5/T/…/..                    35 NNW AERO  M     RMY 35
9/15 67/52/60/+9/0.00/…/..                 21 NE  AERO  M     RMY 20
9/16 74/54/64/+1/0.00/…/..                 23 SSE AERO  M     RMY 24
9/17 77/54/66/+3/0.00/…/..                 28 S   AERO  M     RMY 28

9/18 Low temp since midnight is 64F; normal low is now 54F

DAILY RECORDS FOR SEPTEMBER 2016

9/10/16: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F,
BREAKS PREVIOUS RECORD OF 69F SET IN 1915, 1931, AND 1989

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

RECORDS FOR SEPTEMBER 18
HIGH 88F IN 1906
LOW 36F IN 1919
PRECIP 4.25 INCHES IN 1996
PEAK GUST 77e MPH WNW IN 1948

RECORDS FOR SEPTEMBER 19
HIGH 87F IN 1906,1983
LOW 37F IN 1929
PRECIP 3.69 INCHES IN 1936
PEAK GUST 55 MPH S IN 2012

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle