Monday, September 26, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, SEPTEMBER 26, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

HIGH CLOUDS MOVE IN AS HIGH PRESSURE MOVES OFFSHORE

Skies gradually became cloudier with cirrostratus and cirrus clouds today
while the high pressure system which has given us such clear fall weather
for the past few days moved offshore.  Temperatures were slightly below
normal.  The overnight low reached a minimum of 43F, 8F below the average
of 51F. By 1:00PM EST, the maximum temp. recorded was 66F, 2F below average.
Winds were light and out of the SW-NW during today’s observations.

7 A.M.
Weather: Few cumulus NE-SE, few cirrus in all directions
Temperature: 47F; Dew Point: 36F; Wind: NNW at 5 kts,
Wind Speed: Light
Sea-level pressure: 30.23 ins. Hg, rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 47F
6-hr Min temp: 43F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 70 236/47/36/3305/023/ FEW CU NE-SE FEW CI ALQDS WND LGT/
8/101 51012 10047 20043

10 A.M.
Weather: Few cumulus NE-SE, few cirrostratus in all directions
Temperature: 59F; Dew Point: 34F; Wind: W at 4 kts,
Wind Speed: Light
Sea-level pressure: 30.22 ins. Hg, rising then falling
Visibility: 70 miles
BHO SA 1455 CLR 70 232/59/34/2804/022/ FEW CU NE-SE FEW CS ALQDS WND LGT/
8/105 58004

1 P.M.
Weather: Few cumulus SE and SSW, broken cirrus
Temperature: 65F; Dew Point: 33F; Wind: SW at 5 kts,
Wind Speed: Light
Sea-level pressure: 30.16 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max. temp: 66F
6-hr Min. temp: 47F
6-hr precip: 0.00 in.
BHO SA 1755 E250 70 212/65/33/2205/016/ FEW CU SE AND SSW WND LGT/
8/102 58020 10066 20047

SUMMARY FOR SUNDAY, SEPTEMBER 25, 2016

TEMPERATURE (DEGREES F)
MAX…..65   NORMAL…..68
MIN…..44   NORMAL…..51
MEAN….55   NORMAL…..60

DEPARTURE FROM 30-YEAR NORMAL……………………-5
TOTAL DEPARTURE FOR THE MONTH…………………..+99 [+3.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH………….102   DEPARTURE………+46
TOTAL COOLING UNITS FOR THE SEASON…………894   DEPARTURE……..+301
TOTAL COOLING UNITS LAST SEASON TO DATE…….797   DIFFERENCE……..+97

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..10   DEPARTURE……….+4
TOTAL HEATING UNITS FOR THE MONTH…………..24   DEPARTURE………-56
TOTAL HEATING UNITS FOR THE SEASON………….34   DEPARTURE………-71
TOTAL HEATING UNITS LAST SEASON TO DATE……..27   DIFFERENCE………+7

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….31 NW  AT  1:20 P.M.
ASOS……………………32 NW  AT  1:20 P.M.
DAVIS…………………..29 WNW AT  1:19 P.M. RMY 32
FASTEST MILE FOR YESTERDAY…………………21 WNW AT 12:47 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………23 NW  AT  1:21 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..21 WNW AT  1:21 P.M.
AVERAGE WIND SPEED AND DIRECTION………….12.0 NW
ASOS………………….11.7
DAVIS………………….9.8 NW  [320 Deg.] * Last of several occurrences

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……….1.66  DEPARTURE……-1.66
ASOS…………..1.66
TOTAL PRECIPITATION FOR THE YEAR……….26.63  DEPARTURE…..-11.71
ASOS………….26.93

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/229/30                   25 S   AERO 18 S   RMY 32
9/11 79/59/69/+4/0.10/365/48                 39 WNW AERO 30 WNW RMY 43
9/12 76/53/65/0/0.00/749/99                  18 SW* AERO 13 WNW RMY 19
9/13 81/57/69/+5/0.00/739/98                 25 SSW AERO  M     RMY 26
9/14 87/58/73/+9/T/526/70                    35 NNW AERO  M     RMY 35
9/15 67/52/60/-4/0.00/531/71                 21 NE  AERO  M     RMY 20
9/16 74/54/64/+1/0.00/567/76                 23 SSE AERO  M     RMY 24
9/17 77/54/66/+3/0.00/…/..                 28 S   AERO  M     RMY 28
9/18 79/63/71/+9/T/…/..                    30 SW  AERO  M     RMY 33
9/19 73/67/70/+8/0.16/…/..                 25 S   AERO  M     RMY N/A
9/20 81/66/74/+12/0.00/…/..                16 WSW*AERO  M     RMY N/A
9/21 81/64/73/+12/T/…/..                   20 WNW AERO  M     RMY 18
9/22 82/63/73/+12/0.00/…/..                23 S   AERO  M     RMY 25
9/23 80/53/67/+7/0.16/…/..                 32 NE  AERO  M     RMY 32
9/24 66/48/57/-3/0.03/…/..                 24 NW  AERO  M     RMY 25
9/25 65/44/55/-5/0.00/…/..                 31 NW  AERO  M     RMY 32

9/26 Low temp since midnight is 43F; normal low is now 51F

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 26
HIGH 91F IN 2007
LOW 36F IN 1905,1922,1978
PRECIP 3.84 INCHES IN 1888
PEAK GUST 54e MPH S IN 1977

RECORDS FOR SEPTEMBER 27
HIGH 84F IN 1998, 2014
LOW 32F IN 1947
PRECIP 2.26 INCHES IN 1962
PEAK GUST 100 MPH SSE IN 1985 (HURRICANE GLORIA)

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle