Wednesday, September 7, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 7, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

FOG AND OVERCAST CONDITIONS PERSIST UNTIL LATE MORNING

Remnants of Hermine lasted through this morning bringing thick fog to
Blue Hill.  Visibility had only improved to 10 miles by 1:00PM EST as
distant fog lingered in the area, and, overhead, fog had cleared to
partly cloudy cumulus.  Temperatures were slow to warm to the max. of
78F by the 1:00PM observation.  Winds were much lighter than previous
days due to Hermine’s weakening.

A morning rain shower shortly after the 7:00AM observation left us with
0.05 in. of precip.  Precipitation is currently above normal for the month,
giving us a slight break from the severe drought.

7 A.M.
Weather: Thick fog
Temperature: 66F; Dew Point: 66F; Wind: NNE at 5 kts,
Wind Speed: Light
Sea-level pressure: 30.08 ins. Hg, rising unsteadily
Visibility: 1/8 mile
6-hr Max temp: 67F
6-hr Min temp: 66F
24-hr precip: 0.12 in.
BHO SA 1155 W2 X 1/8F 185/66/66/0305/008/ WND LGT/ 8//// 51013
MANUAL 70011 ASOS 70012 10067 20066

10 A.M.
Weather: Fog, overcast stratus
Temperature: 70F; Dew Point: 69F; Wind: ENE at 5 kts,
Wind Speed: Light
Sea-level pressure: 30.06 ins. Hg, falling, then more quickly
Visibility: 4 miles
3-hr. precip: 0.05
BHO SA 1455 E4 4F 179/70/69/0605/006/ WND LGT/ 8/6// 58006
MANUAL 6005/ ASOS 60005

1 P.M.
Weather: Few stratus NW-NNE, scattered cumulus
Temperature: 77F; Dew Point: 69F; Wind: NE at 8 kts
Sea-level pressure: 30.03 ins. Hg, falling, then more quickly
Visibility: 10 miles, distant fog
6-hr Max. temp: 78F
6-hr Min. temp: 66F
6-hr precip: 0.05 in.
BHO SA 1755 19 SCT 10 170/77/69/0408/003/ FEW ST NW-NNE DSNT FG/ 8/100 58009
MANUAL 6005/ ASOS 60005 10078 20066

SUMMARY FOR TUESDAY, SEPTEMBER 6, 2016

TEMPERATURE (DEGREES F)
MAX…..70   NORMAL…..75
MIN…..61   NORMAL…..58
MEAN….66   NORMAL…..67

DEPARTURE FROM 30-YEAR NORMAL……………………-1
TOTAL DEPARTURE FOR THE MONTH……………………-9 [-1.7 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………1   DEPARTURE……….-2
TOTAL COOLING UNITS FOR THE MONTH……………6   DEPARTURE………-15
TOTAL COOLING UNITS FOR THE SEASON…………798   DEPARTURE……..+240
TOTAL COOLING UNITS LAST SEASON TO DATE…….705   DIFFERENCE……..+93

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……….-2
TOTAL HEATING UNITS FOR THE MONTH……………0   DEPARTURE……….-8
TOTAL HEATING UNITS FOR THE SEASON………….10   DEPARTURE………-23
TOTAL HEATING UNITS LAST SEASON TO DATE………1   DIFFERENCE………+9

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….32 N   AT 12:19 A.M.
AEROVANE………………..23 NNE AT 12:21 A.M.
ASOS……………………33 N   AT 12:20 A.M.
DAVIS…………………..29 N   AT 12:20 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………22 NNE AT 12:00 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………21 NNE AT  3:09 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..20 NNE AT 12:09 A.M.
AVERAGE WIND SPEED AND DIRECTION………….15.0 NNE
ASOS………………….15.1
DAVIS…………………13.4 NE [040 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.11  DEPARTURE……-0.02
ASOS…………..0.12
TOTAL PRECIPITATION FOR THE MONTH……….1.15  DEPARTURE……+0.44
ASOS…………..1.16
TOTAL PRECIPITATION FOR THE YEAR……….26.12  DEPARTURE….. -9.61
ASOS………….26.43

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  72/57/65/-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  Low temp since midnight is 64F; normal low is now 58F

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

RECORDS FOR SEPTEMBER 6
HIGH 92F IN 1900
LOW 39F IN 1888
PRECIP 3.19 INCHES IN 1890
PEAK GUST 78e MPH SE IN 1979 (TROPICAL STORM DAVID)

RECORDS FOR SEPTEMBER 7
HIGH 92F IN 2007, 2015
LOW 40F IN 1888
PRECIP 2.95 INCHES IN 1891
PEAK GUST 58e MPH W IN 1941

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle