Saturday, September 10, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, SEPTEMBER 10,  2016
ALL TIMES ARE IN EASTERN STANDARD TIME

NOT A RECORD AT 90F FOR YESTERDAY, SEPTEMBER 9
17TH 90-DEGREE DAY THIS YEAR AND FIRST SINCE AUGUST 14
LOW TEMPERATURE 71F THIS MORNING WOULD BE RECORD HIGH MINIMUM HOWEVER…
COLD FRONT BRINGS DRIER AIR OVERNIGHT

The first 90-degree temperature since August 14 fell short of
the daily record of 92 degrees on September 9, 2015, just last
year. It was the 17th 90-degree day for 2016

One year ago there was a 3-day September heat wave with a high of
97F on 8 September, with highs in the 90’s from 7-9 September

This morning low temperature of 71F was 14 degrees above normal
and would break a record high minimum record of 69 degrees
however the temperature will likely fall below that 69 by midnight
tonight.

7 A.M.
Weather: Broken stratocumulus, overcast altocumulus, small break
in overcast, virga distant ENE-ESE
Temperature: 72F; Dew Point: 60F; Wind: E at 10 kts
Sea-level pressure: 30.07 ins. Hg, rising then more quickly
Visibility: 40 miles, except 45 miles WNW, light distant haze
6-hr Max temp: 75F
6-hr Min temp: 71F
24-hr precip: none
BHO SA 1155 E55 BKN 90 OVC 40 183/72/60/0910/007/
SML BINOVC VIRGA DSNT ENE-ESE VSBY WNW 45 LGT DSNT HZ/
8/57/ 53012 10075 20071

10 A.M.
Weather: Overcast stratocumulus, hier altocumulus layer visible at
estimated ten thousand feet
Temperature: 76F; Dew Point: 62F; Wind: E at 8 kts,
Wind: Direction variability ENE-SE
Sea-level pressure: 30.10 ins. Hg, rising, then more slowly
Visibility: 35 miles, except 30 miles NE, light distant haze
BHO SA 1455 E60 OVC 35 192/76/62/1008/010/ BRGHT SPTS IOVC
HIER AC LYR VSB AT E100 VSBY NE 30 LGT DSNT HZ ALQDS WND 07V13/
8/53/ 51009

1 P.M.
Weather: Scattered stratocumulus and scattered altocumulus and
altostratus, thin broken cirrus, brief shower of rain past hour
was very light, 05-10 past the hour
Temperature: 78F; Dew Point: 63F; Wind: ESE at 10 kts
Sea-level pressure: 30.06 ins. Hg, falling, then more quickly
Visibility: 20 miles, except 15 miles N-NE
6-hr Max. temp: 79F
6-hr Min. temp: 72F
BHO SA 1755 65 SCT 100 SCT 250 -BKN 20 178/78/63/1110/006/
HAZY AND HZ ALF VSBY N-E 15 WND 07V14 RB05E10/
8/571/ 58014 MANUAL 6000/ 10079 20072

SUMMARY FOR FRIDAY, SEPTEMBER 9, 2016

TEMPERATURE (DEGREES F)
MAX…..90   NORMAL…..74
MIN…..69   NORMAL…..57
MEAN….80   NORMAL…..66

DEPARTURE FROM 30-YEAR NORMAL…………………..+14
TOTAL DEPARTURE FOR THE MONTH…………………..+18 [+1.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..15   DEPARTURE………+12
TOTAL COOLING UNITS FOR THE MONTH…………..35   DEPARTURE……….+5
TOTAL COOLING UNITS FOR THE SEASON…………827   DEPARTURE……..+260
TOTAL COOLING UNITS LAST SEASON TO DATE…….753   DIFFERENCE……..+74

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……….-2
TOTAL HEATING UNITS FOR THE MONTH……………0   DEPARTURE………-15
TOTAL HEATING UNITS FOR THE SEASON………….10   DEPARTURE………-30
TOTAL HEATING UNITS LAST SEASON TO DATE………9   DIFFERENCE………+1

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 W   AT  2:19 P.M.
AEROVANE………………..16 W   AT  2:19 P.M.
ASOS……………………24 W   AT  2:19 P.M.
DAVIS…………………..23 WSW AT  2:18 P.M. RMY 25
FASTEST MILE FOR YESTERDAY…………………16 W   AT  2:18 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17 W   AT  2:22 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16 WSW AT  2:22 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.7 W
ASOS…………………..9.5
DAVIS………………….8.7 W [260 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……….1.21  DEPARTURE……+0.12
ASOS…………..1.22
TOTAL PRECIPITATION FOR THE YEAR……….26.18  DEPARTURE….. -9.93
ASOS………….26.49

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

9/1  72/64/68/0/0.09/…/..                  21 NNW AERO 16 NNW RMY 20
9/2  76/58/67/-1/0.00/…/..                 23 ENE AERO 17 NE  RMY 23
9/3  71/56/64/-3/0.00/…/..                 16 E   AERO 12 E   RMY N/A
9/4  71/58/65/-2/0.00/…/..                 28 NE  AERO 21 NE  RMY 27
9/5  73/57/65/-2/0.52/…/..                 42 NNE AER0 33 NNE RMY 43
9/6  70/61/66/-1/0.54/…/..                 32 N   AERO 23 NNE RMY N/A
9/7  78/66/72/+6/0.05/…/..                 21 NE* AERO 15 NE* RMY 21
9/8  79/65/72/+6/T/…/..                    22 S   AERO 15 S   RMY 23
9/9  90/69/80/+14/T/…/..                   23 W   AERO 24 W   RMY 25

9/10 Low temp since midnight is 71F; normal low is now 57F

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

RECORDS FOR SEPTEMBER 10
HIGH 90F IN 1931,1989
LOW 41F IN 1956
PRECIP 5.60 INCHES IN 1999 (DAILY RECORD FOR SEPTEMBER)
PEAK GUST 48 MPH NW IN 1972

RECORDS FOR SEPTEMBER 11
HIGH 93F IN 1983, 2013
LOW 37F IN 1917
PRECIP 5.23 INCHES IN 1954 (HURRICANE EDNA)

TODAY’S REPORT PREPARED BY: Robert Skilling