Saturday, August 11, 2018

| August 11, 2018 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, AUGUST 11, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

RAINY DAY WITH OVERCAST SKIES….

We had a rainy and cooler day on top of Great Blue Hill.
So far we have received 0.28 ins. of precipitation. The
rain has been mostly light today with a heavy band
mid-morning. Temperatures so far today have been below
normal with a max of 71F at midnight and a day time max
of 69F. These are both below the daily normal of 80F.
Yesterday the wind shifted coming from the WNW to the ESE
and continued to come from the ESE for most of the day
today. Visibility was obscured due to fog today and we
could see a max of 20 miles at 10:00 A.M. then thicker fog
returned and we have variable visibility at the 1:00 P.M.
observation.
So far August has been above normal for both temperature
and precipitation.

Today’s Observations:

7 A.M.
Weather: Rain and fog
Temperature: 67F; Dew Point: 67F; Wind: SE at 6 kts,
Wind: Light
Sea-level pressure: 30.01 ins. Hg, rising then steady
Visibility: 1/2 mile
6-hr Max temp: 71F
6-hr Min temp: 67F
24-hr Precip: 0.03 ins.
BHO SA 1155 W3 X 1/2RF 163/67/67/1306/001/ WND LGT/ 8//// 51015
MANUAL 70003 ASOS 70002 10071 20067

10 A.M.
Weather: Light drizzle, scattered stratus fractus, broken
stratus, overcast nimbostratus
Temperature: 66F; Dew Point: 65F; Wind: ESE at 10G14 kts
Sea-level pressure: 29.89 ins. Hg, rising, then more slowly
Visibility: 20 miles, distant fog in all directions
3-hr Precip: 0.10 ins.
BHO SA 1455 8 SCT E40 BKN E80 OVC 20L- 171/66/65/1110G14/003/
PTCHS FG DRFTG BLO SMT ALQDS R BCMG L- 40 DSNT FG ALQDS/ 8/62/
53008 MANUAL 6010/ ASOS 60011

1 P.M.
Weather: Light drizzle and fog, scattered stratus
fractus, overcast nimbostratus
Temperature: 69F; Dew Point: 68F; Wind: ESE at 7G11 kts
Sea-level pressure: 30.04 ins. Hg, rising then falling
Visibility: 1/2 mile, except E-SSW 2 variable 3 miles
6-hr Max temp: 69F
6-hr Min temp: 66F
6-hr Precip: 0.25 ins.
BHO SA 1755 9 SCT E45 OVC 1/2L-F 173/69/68/1007G11/004/
VSBY 2V3 E-SSW/ 8/72/ 50002 MANUAL 6025/ ASOS 60026
10069 20066

SUMMARY FOR FRIDAY, AUGUST 10, 2018

TEMPERATURE (DEGREES F)
MAX…..85   NORMAL…..80
MIN…..66   NORMAL…..63
MEAN….76   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL…………………….+5
TOTAL DEPARTURE FOR THE MONTH……………………+72 [+7.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..11   DEPARTURE……….+4
TOTAL COOLING UNITS FOR THE MONTH………….141   DEPARTURE………+70
TOTAL COOLING UNITS FOR THE SEASON…………596   DEPARTURE……..+174
TOTAL COOLING UNITS LAST SEASON TO DATE…….489   DEPARTURE……..+107

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY…………………17 NW  AT  2:51 A.M.
AERO……………………..16 NW  AT  1:52 A.M.
ASOS……………………..17 NW  AT  1:52 A.M.
DAVIS…………………….17 NW  AT  1:16 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………..12 NW  AT  1:53 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………..13 ESE AT 10:07 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………….14 NW  AT  1:54 A.M.
AVERAGE WIND SPEED AND DIRECTION…………….7.0 NW
ASOS…………………….7.5
DAVIS……………………7.5 NW [314 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.03  DEPARTURE……-0.10
ASOS…………..0.02
TOTAL PRECIPITATION FOR THE MONTH……….2.15  DEPARTURE……+0.70
ASOS…………..2.16
TOTAL PRECIPITATION FOR THE YEAR……….36.16  DEPARTURE……+3.90
ASOS………….37.74

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 Low temp since midnight is 67F; normal low is now 63F

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 11
HIGH 97F IN 1944
LOW 49F IN 1972
PRECIP 3.13 INCHES IN 1990
PEAK GUST 44 MPH SW IN 1971

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

TODAY’S REPORT PREPARED BY: Kaitlin Geagan

 

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