Friday, September 16, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, SEPTEMBER 16, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

COOLER TEMPS AND DRY CONDITIONS CONTINUE

Today was another beautiful day on top of Blue Hill.  Morning cloud
cover cleared to scattered cirrus by the early afternoon with 70 miles
of visibility all day.  Winds remained light, but cool temperatures and
low dew points made for a very pleasant day.  Yesterday’s average
temperature of 60F gave us the first heating degree days for the month
and the first HDD’s of the season since mid-July.

7 A.M.
Weather: Few distant cumulus NE-S, broken stratocumulus
Temperature: 57F; Dew Point: 51F; Wind: SW at 6 kts,
Wind Speed: Light
Sea-level pressure: 30.35 ins. Hg, falling then rising
Visibility: 70 miles
6-hr Max temp: 57F
6-hr Min temp: 54F
24-hr precip: 0.00 in.
BHO SA 1155 E35 BKN 70 278/57/51/2206/035/ FEW DSNT CU NE-S WND LGT/
8/500 53009 10057 20054

10 A.M.
Weather: Scattered cumulus
Temperature: 65F; Dew Point: 47F; Wind: estimated W at 3 kts,
Wind: Light and variable
Sea-level pressure: 30.07 ins. Hg, rising then falling
Visibility: 70 miles
BHO SA 1455 54 SCT 70 285/65/47/E2603/307/ WND L/V/ 8/100 50007

1 P.M.
Weather: Few cirrus W-E, scattered cumulus
Temperature: 71F; Dew Point: 47F; Wind: SSE at 4 kts,
Wind: Light and variable
Sea-level pressure: 30.32 ins. Hg, falling, then more quickly
Visibility: 70 miles
6-hr Max. temp: 72F
6-hr Min. temp: 57F
BHO SA 1755 44 SCT 70 269/71/47/1504/032/ FEW CI W-E WND L/V/
8/101 58016 10072 20057

SUMMARY FOR THURSDAY, SEPTEMBER 15, 2016

TEMPERATURE (DEGREES F)
MAX…..67   NORMAL…..72
MIN…..52   NORMAL…..55
MEAN….60   NORMAL…..64

DEPARTURE FROM 30-YEAR NORMAL……………………-4
TOTAL DEPARTURE FOR THE MONTH…………………..+43 [+2.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….-2
TOTAL COOLING UNITS FOR THE MONTH…………..63   DEPARTURE………+20
TOTAL COOLING UNITS FOR THE SEASON…………855   DEPARTURE……..+275
TOTAL COOLING UNITS LAST SEASON TO DATE…….762   DIFFERENCE……..+93

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………5   DEPARTURE……….+2
TOTAL HEATING UNITS FOR THE MONTH……………5   DEPARTURE………-26
TOTAL HEATING UNITS FOR THE SEASON………….15   DEPARTURE………-41
TOTAL HEATING UNITS LAST SEASON TO DATE………6   DIFFERENCE………+9

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….21 NE  AT 10:37 A.M.
ASOS……………………21 NE  AT 10:37 A.M.
DAVIS…………………..19 NE  AT  9:51 A.M. RMY 20
FASTEST MILE FOR YESTERDAY…………………13 NNE AT 10:01 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………14 ENE AT 11:01 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..13 NNE AT 10:00 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.0 NNW
ASOS…………………..9.4
DAVIS………………….7.9 NE [050 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.31  DEPARTURE……-0.57
ASOS…………..1.30
TOTAL PRECIPITATION FOR THE YEAR……….26.28  DEPARTURE…..-10.62
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  71/56/64/-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 Low temp since midnight is 54F; normal low is now 55F

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 16
HIGH 91F IN 1939,1941
LOW 39F IN 1984
PRECIP 5.12 INCHES IN 1933 (Hurricane)
PEAK GUST 59 MPH SSE IN 1999

RECORDS FOR SEPTEMBER 17
HIGH 87F IN 2015
LOW 38F IN 1959
PRECIP 2.73 INCHES IN 1933
PEAK GUST 60 MPH WNW IN 1999

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle