Tuesday, October 18, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, OCTOBER 18, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

BACKDOOR COLD FRONT STALLS OVER REGION,
FOG STILL IN PLACE AT 1:00PM EST OBSERVATION

Early morning showers amounted to 0.54 in. of precip. at the 7:00AM
ob and brought our monthly departure to 1.32 in. above normal and
yearly departure to 10.44 in. below normal.  A backdoor cold front
stalled over the region and has left BHO in the fog all day.
Visibility improved to just 3 miles by the 1:00PM ob.

Today’s temperatures have been much lower than the 80F forecasted for
the Boston area.  Temperatures continued to decrease after 7:00AM to
a minimum of 56F and had increased to 62F by 1:00PM.  Despite being so
far from the original forecast, temperatures have still been approximately
8F above normal.

7 A.M.
Weather: Thick fog
Temperature: 57F; Dew Point: 56F; Wind: N at 5 kts,
Wind Speed: Light
Sea-level pressure: 29.96 ins. Hg, rising, then less quickly
Visibility: 1/8 mile
6-hr Max temp: 64F
6-hr Min temp: 57F
24-hr precip: 0.54 in.
BHO SA 1155 W3 X 1/8F 146/57/56/3505/996/ WND LGT/ 8//// 53013
ASOS 70055 MANUAL 70054 10064 20057

10 A.M.
Weather: Thick fog
Temperature: 58F; Dew Point: 57F; Wind: Calm
Sea-level pressure: 29.96 ins. Hg, rising then falling
Visibility: 1/8 mile
BHO SA 1455 W3 X 1/8F 146/58/57/0000/996/ WND CLM/ 8//// 58000

1 P.M.
Weather: Fog
Temperature: 62F; Dew Point: 60F; Wind: SSE at 4 kts,
Wind Speed: Light
Sea-level pressure: 29.91 ins. Hg, falling, then more quickly
Visibility: 3 miles
6-hr Max. temp: 62F
6-hr Min. temp: 56F
BHO SA 1755 W3 X 3F 127/62/60/1504/991/ WND LGT/ 8//// 58019 10062 20056

SUMMARY FOR MONDAY, OCTOBER 17, 2016

TEMPERATURE (DEGREES F)
MAX…..76   NORMAL…..60
MIN…..58   NORMAL…..42
MEAN….67   NORMAL…..51

DEPARTURE FROM 30-YEAR NORMAL…………………..+16
TOTAL DEPARTURE FOR THE MONTH…………………..+40 [+2.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………2   DEPARTURE……….+2
TOTAL COOLING UNITS FOR THE MONTH……………2   DEPARTURE……….-3
TOTAL COOLING UNITS FOR THE SEASON…………896   DEPARTURE……..+294
TOTAL COOLING UNITS LAST SEASON TO DATE…….810   DIFFERENCE……..+86

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-14
TOTAL HEATING UNITS FOR THE MONTH………….148   DEPARTURE………-44
TOTAL HEATING UNITS FOR THE SEASON…………223   DEPARTURE……..-111
TOTAL HEATING UNITS LAST SEASON TO DATE…….225   DIFFERENCE………-2

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 WSW AT  2:18 A.M.
ASOS……………………23 WSW AT  2:19 A.M.
DAVIS…………………..23 WSW AT  2:18 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………16 WSW AT  2:33 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17 WSW AT  2:33 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16 WSW AT  2:33 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..8.1 WSW
ASOS…………………..8.0
DAVIS………………….7.2 WSW [250 Deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.54  DEPARTURE……+0.39
ASOS…………..0.55
TOTAL PRECIPITATION FOR THE MONTH……….3.84  DEPARTURE……+1.32
ASOS…………..3.86
TOTAL PRECIPITATION FOR THE YEAR……….31.16  DEPARTURE…..-10.44
ASOS………….31.50

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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

10/1  57/52/55/-2/1.22/000/00                 33 NNE AERO  M  RMY 34
10/2  55/52/54/-3/0.19/…/..                 23 N   AERO  M  RMY N/A
10/3  69/53/61/+5/0.00/…/..                 21 ENE AERO  M  RMY 20
10/4  61/47/54/-2/T/…/..                    26 NE  AERO  M  RMY 27
10/5  61/44/53/-3/0.00/…/..                 22 NE  AERO  M  RMY 21
10/6  71/46/59/+4/0.00/…/..                 16 SW* AERO  M  RMY 15
10/7  75/54/65/+10/0.00/…/..                16 S   AERO  M  RMY 16
10/8  69/53/61/+7/0.00/…/..                 23 SSW AERO  M  RMY 23
10/9  63/44/54/0/1.89/…/..                  28 N   AERO  M  RMY 34
10/10 57/40/49/-5/0.00/…/..                 32 NW  AERO  M  RMY 32
10/11 62/39/51/-2/0.00/…/..                 17 N   AERO  M  RMY N/A
10/12 68/49/59/+6/0.00/…/..                 17 S   AERO  M  RMY 17
10/13 71/52/62/+9/T/…/..                    24 SSW AERO  M  RMY 28
10/14 58/41/50/-2/0.00/…/..                 26 NNW AERO  M  RMY 25
10/15 58/38/48/-4/0.00/…/..                 23 S   AERO  M  RMY 26
10/16 68/46/57/+6/0.00/…/..                 28 SSW AERO  M  RMY 30
10/17 76/58/67/+16/0.00/…/..                23 WSW AERO  M  RMY N/A

10/18 Low temp since midnight is 57F; normal low is now 42F

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

RECORDS FOR OCTOBER 18
HIGH 82F IN 1908
LOW 26F IN 1939
PRECIP 2.79 INCHES IN 1975
SNOWFALL 3.0 INCHES IN 2009
PEAK GUST 66 MPH S IN 1967

RECORDS FOR OCTOBER 19
HIGH 81F IN 1945
LOW 21F IN 1922
PRECIP 3.64 INCHES IN 1932
SNOWFALL 1.0 INCHES IN 1972
PEAK GUST 66 MPH SSW IN 1967

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle