Friday, September 9, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, SEPTEMBER 9, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

MAX TEMPERATURE FOR THE MONTH SO FAR,
OVERCAST SKIES CLEAR TO PARTLY SUNNY BY EARLY AFTERNOON

Overcast morning skies gave us the slightest trace of precipitation
before 6:00AM EST.  The clouds were slow to break away, but finally
cleared to partly sunny skies by the 1:00PM EST observation.  While
visibility was 70 miles at that time, the high amount of  moisture
in the air made for hazy conditions.

Temperatures warmed to a max. of 89F by 1:00PM, also the max. temp.
for the month so far.  The record high temperature for September 9
is 92F set in 2015.  It is very possible that we will tie or break
the record with clearer skies in place this afternoon.

7 A.M.
Weather: Broken altostratus, overcast altostratus
Temperature: 72F; Dew Point: 70F; Wind: WSW at 7 kts
Sea-level pressure: 29.84 ins. Hg, rising unsteadily
Visibility: 10 miles, distant fog
6-hr Max temp: 72F
6-hr Min temp: 69F
24-hr precip: Trace
BHO SA 1155 E74 BKN OVC 120 10 105/72/70/2407/984/ DSNT FG/
8/01/ 53014 10072 20069

10 A.M.
Weather: Broken altostratus, broken cirrus
Temperature: 79F; Dew Point: 72F; Wind: NW at 7 kts
Sea-level pressure: 29.85 ins. Hg, rising, then falling
BHO SA 1455 E74 BKN 250 BKN 20 107/79/72/3107/985/ DSNT FG/
8/011 50002

1 P.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 89F; Dew Point: 68F; Wind: W at 9G16 kts
Sea-level pressure: 29.84 ins. Hg, falling, then more quickly
Visibility: 70 miles, hazy
6-hr Max. temp: 89F
6-hr Min. temp: 72F
BHO SA 1755 35 SCT 250 SCT 70 106/89/68/2609G16/984/ HAZY/ 8/101
58001 10089 20072

SUMMARY FOR THURSDAY, SEPTEMBER 8, 2016

TEMPERATURE (DEGREES F)
MAX…..79   NORMAL…..74
MIN…..65   NORMAL…..57
MEAN….72   NORMAL…..66

DEPARTURE FROM 30-YEAR NORMAL……………………+6
TOTAL DEPARTURE FOR THE MONTH……………………+3 [+0.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………7   DEPARTURE……….+4
TOTAL COOLING UNITS FOR THE MONTH…………..20   DEPARTURE……….-7
TOTAL COOLING UNITS FOR THE SEASON…………812   DEPARTURE……..+248
TOTAL COOLING UNITS LAST SEASON TO DATE…….737   DIFFERENCE……..+75

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……….-2
TOTAL HEATING UNITS FOR THE MONTH……………0   DEPARTURE………-12
TOTAL HEATING UNITS FOR THE SEASON………….10   DEPARTURE………-27
TOTAL HEATING UNITS LAST SEASON TO DATE………1   DIFFERENCE………+9

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….22 S   AT  9:57 P.M.
AEROVANE………………..15 S   AT  9:57 P.M.
ASOS……………………23 S   AT  9:56 P.M.
DAVIS…………………..22 S   AT  9:56 P.M. RMY 23
FASTEST MILE FOR YESTERDAY…………………15 SSW AT 11:14 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17 SSW AT 11:20 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16 SSW AT 11:20 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..6.4 NNE
ASOS…………………..7.4
DAVIS………………….6.1 E [100 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…TRACE  DEPARTURE……-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.21  DEPARTURE……+0.25
ASOS…………..1.22
TOTAL PRECIPITATION FOR THE YEAR……….26.18  DEPARTURE….. -9.80
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  Low temp since midnight is 69F; 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 9
HIGH 92F IN 2015
LOW 41F IN 1938
PRECIP 1.97 INCHES IN 1969
PEAK GUST 52 MPH WNW IN 1969, NW IN 1978

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle