Sunday, August 12, 2018

| August 12, 2018 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, AUGUST 12, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

FOGGY, DRIZZLY AND COOL ATOP GREAT BLUE HILL….

We measured 0.43 inches of rain at 7 A.M, and 0.15 inches
at 10 A.M. Weather conditions consisted of a light drizzle
for most of the day, with a period of heavier rain between
8 A.M. and 9 A.M. Visibility was limited to a 1/2 mile due
to a thick fog surrounding the summit. It was cool today,
with a high temperature so far of 73F. This is 7 degrees
below the daily normal of 80F.

Today’s Observations:

7 A.M.
Weather: Light drizzle, overcast nimbostratus
Temperature: 68F; Dew Point: 68F; Wind: NE at 5 kts,
Wind: Light
Sea-level pressure: 30.01 ins. Hg, rising, then more rapidly
Visibility: 1/2 mile, fog
6-hr Max temp: 68F
6-hr Min temp: 67F
24-hr Precip: 0.42 ins.
BHO SA 1155 W3 X 1/2L-F 187/68/68/0505/008/ FOG WND LGT/
8//// 53012 MANUAL 70042 ASOS 70043 10068 20067

10 A.M.
Weather: Light drizzle, overcast nimbostratus
Temperature: 70F; Dew Point: 70F; Wind: NE at 5 kts,
Wind: Light
Sea-level pressure: 30.11 ins. Hg, rising steadily
Visibility: 1/2 mile, fog
3-hr Precip: 0.15 ins.
BHO SA 1455 W3 X 1/2L-F 195/70/70/0405/011/ FOG WND LGT/
8//// 53008 MANUAL 6015/ ASOS 60015

1 P.M.
Weather: Overcast stratus
Temperature: 71F; Dew Point: 70F; Wind: NE at 13G18 kts
Sea-level pressure: 30.09 ins. Hg, falling steadily
Visibility: 1/2 mile, fog
6-hr Max temp: 73F
6-hr Min temp: 67F
6-hr Precip: 0.15 ins.
BHO SA 1755 W3 X 1/2F 192/71/70/0513G18/009/ FOG/ 8////
58003 MANUAL 60015 ASOS 60015 10073 20067

SUMMARY FOR SATURDAY, AUGUST 11, 2018

TEMPERATURE (DEGREES F)
MAX…..70   NORMAL…..80
MIN…..66   NORMAL…..63
MEAN….68   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL…………………….-3
TOTAL DEPARTURE FOR THE MONTH……………………+69 [+6.1 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………3   DEPARTURE……….-4
TOTAL COOLING UNITS FOR THE MONTH………….144   DEPARTURE………+66
TOTAL COOLING UNITS FOR THE SEASON…………599   DEPARTURE……..+170
TOTAL COOLING UNITS LAST SEASON TO DATE…….497   DEPARTURE……..+102

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………………18 SE  AT  7:57 A.M.
AERO……………………..17 SE  AT  7:57 A.M.
ASOS……………………..19 ESE AT  7:59 A.M.
DAVIS…………………….18 SE  AT  7:33 A.M. RMY 18
FASTEST MILE FOR YESTERDAY…………………..15 SE  AT  8:00 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………..15 ESE AT  8:00 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………….15 ESE AT  8:00 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….8.5 ESE
ASOS…………………….9.2
DAVIS……………………9.0 ESE [123 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.43  DEPARTURE……+0.29
ASOS…………..0.45
TOTAL PRECIPITATION FOR THE MONTH……….2.58  DEPARTURE……+0.99
ASOS…………..2.59
TOTAL PRECIPITATION FOR THE YEAR……….36.59  DEPARTURE……+4.19
ASOS………….38.17

PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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

8/1  82/66/74/+2/T/…/..           31 S   AERO 30 S   RMY 31
8/2  92/74/83/+11/0.00/…/..       30 SW  AERO 28 SW  RMY 31
8/3  88/74/81/+9/0.19/…/..        35 NW  AERO 32 NW  RMY 35 TSTM
8/4  82/69/76/+4/1.16/…/..        28 SW  AERO 25 SW  RMY 30 TSTM
8/5  89/66/78/+6/0.00/…/..        20 W   AERO 18 W   RMY 19
8/6  92/71/82/+10/0.00/…/..       20 W   AERO 16 WSW RMY N/A
8/7  92/73/83/+11/0.00/…/..       25 S   AERO 23 S   RMY 26
8/8  88/71/80/+8/…./…/..        25 SSW AERO 25 SSW RMY N/A TSTM
8/9  86/70/78/+6/…./…/..        29 SW  AERO 28 SW  RMY N/A TSTM
8/10 85/66/76/+5/…./…/..        17 NW  AERO 16 NW  RMY N/A
8/11 70/66/68/-3/…./…/..        18 SE  AERO 17 SE  RMY 18

8/12 Low temp since midnight is 67F; normal low is now 62F

DAILY RECORDS FOR AUGUST 2018

08/03/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 74F,
BREAK PREVIOUS RECORD OF 71F SET IN 1928, 1969, AND 1979

08/07/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 73F,
BREAK PREVIOUS RECORD OF 72F SET IN 1988

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

RECORDS FOR AUGUST 12
HIGH 99F IN 1944
LOW 48F IN 1930
PRECIP 1.89 INCHES IN 1979
PEAK GUST 50 MPH NE IN 1983

RECORDS FOR AUGUST 13
HIGH 98F IN 1944, 2002
LOW 47F IN 1902, 1957
PRECIP 2.92 INCHES IN 1989
PEAK GUST 52 MPH SSE IN 1963

TODAY’S REPORT PREPARED BY: Benjamin Turner

 

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