Friday, December 9, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, DECEMBER 9, 2016

NW WINDS BRING CHILLY ARCTIC AIR TO REGION

Gusty winds have made the already lower than normal temperatures
feel much colder today.  Temperatures warmed to just 35F by 1:00PM
after an overnight low of 28F.  Tomorrow’s temperatures are expected
to drop even further as more arctic air enters the region.

Westerly winds continue to gust through the early afternoon.  A
peak gust of 30 kts (35 MPH) W was recorded at 9:06AM.  Skies have
been partly cloudy with cumulus, and visibility has held steady at
70 miles.

7 A.M.
Weather: Few cumulus in all directions
Temperature: 28F; Dew Point: 18F; Wind: W at 14G23 kts
Sea-level pressure: 29.90 ins. Hg, rising, then more quickly
Visibility: 70 miles
6-hr Max temp: 29F
6-hr Min temp: 28F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 70 126/28/18/2714G23/990/ FEW CU ALQDS/
8/100 53015 10029 20028

10 A.M.
Weather: Scattered cumulus
Temperature: 32F; Dew Point: 19F; Wind: WNW at 16G22 kts,
Peak Wind: 30 kts (35 MPH) W at 9:06AM
Sea-level pressure: 29.96 ins. Hg, rising, then less quickly
Visibility: 70 miles
BHO SA 1455 39 SCT 145/32/19/2916G22/996/ PK WND 2830/06/ 8/100 51019

1 P.M.
Weather: Scattered cumulus
Temperature: 32F; Dew Point: 14F; Wind: WNW at 20G28 kts,
Peak Wind: 28 kts (32 MPH) WNW at 12:46PM
Sea-level pressure: 29.94 ins. Hg, steady then falling
Visibility: 70 miles
6-hr Max temp: 35F
6-hr Min temp: 28F
BHO SA 1755 49 SCT 140/32/14/2920G28/994/ PK WND 2928/46/
8/100 58005 10035 20028

SUMMARY FOR THURSDAY, DECEMBER 8, 2016

TEMPERATURE (DEGREES F)
MAX…..40   NORMAL…..42
MIN…..29   NORMAL…..26
MEAN….35   NORMAL…..34

DEPARTURE FROM 30-YEAR NORMAL……………………+1
TOTAL DEPARTURE FOR THE MONTH…………………..+17 [+1.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..30   DEPARTURE……….-1
TOTAL HEATING UNITS FOR THE MONTH………….221   DEPARTURE………-17
TOTAL HEATING UNITS FOR THE SEASON………..1251   DEPARTURE……..-249
TOTAL HEATING UNITS LAST SEASON TO DATE……1183   DIFFERENCE……..+68

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….30 W   AT 10:12 P.M.
ASOS……………………33 WNW AT 10:12 P.M.
DAVIS…………………..28 W   AT 10:12 P.M. RMY 33
FASTEST MILE FOR YESTERDAY…………………22 W   AT 10:12 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………22 WNW AT 10:38 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..20 W   AT 10:13 P.M.
AVERAGE WIND SPEED AND DIRECTION………….10.3 WSW
ASOS………………….10.6
DAVIS………………….9.1 WSW [240 Deg.] *last of multiple occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.43  DEPARTURE……-0.89
ASOS…………..0.49
TOTAL PRECIPITATION FOR THE YEAR……….37.40  DEPARTURE…..-12.45
ASOS………….37.92

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.3
TOTAL SNOWFALL FOR THE MONTH…………….0.4  DEPARTURE…….-1.3
TOTAL SNOWFALL FOR THE SEASON……………0.4  DEPARTURE…….-3.9

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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

12/1  55/39/47/+10/0.20/0.0/385/69          36 W   AERO 37 W   RMY 36
12/2  48/34/41/+5/0.00/0.0/535/96           32 W   AERO 32 W   RMY N/A
13/3  44/31/38/+2/0.00/0.0/…/..           37 WNW AERO 39 WNW RMY 40
12/4  39/27/33/-2/0.00/0.0/…/..           25 NW  AERO 25 NW  RMY N/A
12/5  36/27/32/-3/0.13/0.4/…/..           26 W   AERO 25 W   RMY 29
12/6  42/30/36/+1/0.00/0.0/…/..           22 W   AERO 21 W   RMY N/A
12/7  39/34/37/+3/0.10/0.0/…/..           21 E   AERO 21 E   RMY N/A
12/8  40/29/35/+1/0.00/0.0/…/..           30 W   AERO 31 W   RMY 33

12/9  Low temp since midnight is 28F; normal low is now 26F

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

RECORDS FOR DECEMBER 9
HIGH 68 IN 1966
LOW -14 IN 1902
PRECIP 3.23 INS. IN 2014
SNOWFALL 10.8 INS. IN 2005
PEAK GUST 66 SE IN 1973

RECORDS FOR DECEMBER 10
HIGH 62 IN 1946
LOW -6 IN 1902
PRECIP 1.67 INS. IN 1907
SNOWFALL 6.0 INS. IN 1905
PEAK GUST 66e SW IN 1940

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle