Saturday, September 7, 2019

| September 9, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, SEPTEMBER 7, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

MOSTLY CLOUDY WITH DISSIPATING FOG FOLLOWING
LAST NIGHT’S RAIN FROM HURRICANE DORIAN PASSING
OFFSHORE….

We observed a good visibility of 75 miles on average
throughout the day. Wind shifted from N-NW, with a
max gust so far of 36 mph this morning. Rainfall from
the passing of Hurricane Dorian left 0.30 inches in
the gauge by 7 A.M. Only trace amounts of rain were
observed afterword. Due to mostly cloudy skies and a
northerly breeze, temperatures have remained below
seasonal averages. The high so far today is 67F, which
is 8 degrees below the daily normal maximum of 75F.
The low since midnight is 51F, which is 7 degrees below
the normal minimum of 58F.

PRELIMINARY STATS FOR AUGUST 2019

TEMPERATURE, Deg. F
Avg. Max. 80.4 [+1.2]
Avg. Min. 62.1 [+0.3]
Mean      71.5 [+1.0]
24-hour corrected mean: 70.5
Max. for month: 92F on the 19th
Min. for month: 51F on the 26th

COOLING DEGREE DAYS
Total cooling units:   211 [+22]
Total for the season:  619 [+82]
Total for last season: 753

PRECIPITATION, Inches
Total: 1.83 [-2.21]
Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 9.1 mph
Avg. corrected wind speed:   9.8 mph
Prevailing wind direction: N/A
Peak gust and direction: N/A

SUNSHINE:
Campbell-Stokes card minutes: N/A
Astronomical total minutes:   N/A

Today’s Observations:

7 A.M.
Weather: Broken stratus fractus, overcast nimbostratus,
breaks in overcast to the S, light rain
Temperature: 53F; Dew Point: 53F; Wind: N at 9G22 kts,
Peak wind: 36 MPH (31 kts) N at 5:57 A.M.
Sea-level pressure: 29.70 ins. Hg, rising unsteadily
Visibility: 70 miles, except 30 miles S-SW and 10 miles
NW-NE due to fog
6-hr Max temp: 56F
6-hr Min temp: 51F
24-hr Precip: 0.30 ins.
BHO SA 1155 20 BKN E65 OVC 70R- 057/53/53/0109G22/970/
BINOVC S DSNT FG ALQDS VSBY 30 S-SW 10 NW-NE R-CTD PK
WND 0131/1057/ 8/72/ 70030 52010 10056 20051

10 A.M.
Weather: Broken stratocumulus
Temperature: 55F; Dew Point: 52F; Wind: NW at 9G17 kts
Sea-level pressure: 29.72 ins. Hg, rising steadily
Visibility: 80 miles, except 30 miles NE-SSE
3-hr Precip: Trace
BHO SA 1455 E20 BKN 80 063/55/52/3309G17/972/ DSNT
FG VSBY 30 NE-SSE/ 8/800 600// 53006

1 P.M.
Weather: Broken cumulus and altostratus
Temperature: 65F; Dew Point: 51F; Wind: NW at 10G18 kts
Sea-level pressure: 29.73 ins. Hg, rising steadily
Visibility: 75 miles
6-hr Max temp: 67F
6-hr Min temp: 52F
BHO SA 1755 E40 BKN 200 BKN 75 067/65/51/3210G18/973/
8/820 600// 53004 10067 20052

SUMMARY FOR FRIDAY, SEPTEMBER 6, 2019

TEMPERATURE (DEGREES F)
MAX…..65   NORMAL…..75
MIN…..56   NORMAL…..58
MEAN….61   NORMAL…..67

DEPARTURE FROM 30-YEAR NORMAL………………….-6
TOTAL DEPARTURE FOR THE MONTH…………………-10 [-1.9 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………-3
TOTAL COOLING UNITS FOR THE MONTH…………..12   DEPARTURE………-9
TOTAL COOLING UNITS FOR THE SEASON…………631   DEPARTURE……..+73
TOTAL COOLING UNITS LAST SEASON TO DATE…….820   DEPARTURE…….-189

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..37 ENE AT 10:49 P.M.
AERO…………………….36 ENE AT 10:05 P.M.
ASOS…………………….37 ENE AT  9:00 P.M.
DAVIS……………………38 E   AT  8:50 P.M. RMY 36
FASTEST MILE FOR YESTERDAY………………….25 ENE AT  9:00 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….24 ENE AT  9:00 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………25 ENE AT  9:00 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..11.9 E
ASOS…………………..13.0
DAVIS………………….12.5 ENE [75 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.30  DEPARTURE……+0.17
ASOS…………..0.30
TOTAL PRECIPITATION FOR THE MONTH……….0.67  DEPARTURE……-0.04
ASOS…………..0.67
TOTAL PRECIPITATION FOR THE YEAR……….37.82  DEPARTURE……+2.08
ASOS………….37.70

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

8/01  84/66/75/+3/0.00/755/87               18 NNW AERO 20 NW  RMY 17
8/02  83/61/72/0/0.00/804/93                18 WSW AERO 18 WSW RMY 18
8/03  84/66/75/+3/0.00/302/35               25 SW  AERO 26 SW  RMY 25
8/04  83/66/75/+3/0.00/732/85               21 NE  AERO 23 SW  RMY 25
8/05  81/58/70/-2/0.00/842/98               20 S   AERO 18 S   RMY 19
8/06  79/63/71/-1/0.00/282/33               15 S   AERO 14 S   RMY 17
8/07  82/66/74/+2/…./367/43               32 SSW AERO 35 SSW RMY 35
8/08  84/67/76/+4/…./588/69               30 SW  AERO 24 WNW RMY 29
8/09  82/63/73/+1/…./815/96               28 NW  AERO 25 NW  RMY 26
8/10  78/59/69/-2/…./720/85               32 NW  AERO 28 NW  RMY 28
8/11  78/55/67/-4/0.00/734/87               28 W   AERO 25 W   RMY 28
8/12  82/60/71/0/0.00/749/89                25 W   AERO 23 W   RMY 26
8/13  77/66/72/+1/0.02/059/07               25 W   AERO 24 WSW RMY 24
8/14  75/62/69/-2/…./452/54               24 ENE AERO 22 ENE RMY 22
8/15  77/59/68/-3/…./568/68               17 ESE AERO 15 SSE RMY 16
8/16  78/61/70/-1/…./732/88               20 E   AERO 17 ESE RMY 18
8/17  78/67/73/+2/…./099/12               14 SE  AERO 15 SE  RMY 15
8/18  88/70/79/+8/…./529/64               18 SSW AERO 18 SSW RMY 21
8/19  92/69/81/+11/…./…/..              25 WSW AERO 23 WSW RMY 25
8/20  87/66/77/+7/…./…/..               18 W   AERO 14 WSW RMY N/A
8/21  85/68/77/+7/0.12/…/..               33 SW  AERO 32 SW  RMY 33
8/22  88/68/78/+8/0.00/…/..               25 W   AERO 21 W   RMY 26
8/23  78/60/69/-1/0.04/…/..               23 N   AERO 18 N   RMY 24
8/24  72/55/64/-6/0.00/…/..               25 ENE AERO 21 ENE RMY 22
8/25  66/56/61/-8/0.00/…/..               31 ENE AERO 25 ENE RMY 29
8/26  71/51/61/-8/0.00/…/..               25 NE  AERO 21 NE  RMY 25
8/27  77/54/66/-3/0.00/…/..               18 SSW AERO 18 SSW RMY 17
8/28  78/59/69/0/…./…/..                21 SSE AERO 18 SSE RMY 20
8/29  83/63/73/+4/…./…/..               25 WNW AERO 21 WNW RMY 26
8/30  84/59/72/+4/…./…/..               30 SW  AERO 30 SW  RMY 28
8/31  79/61/70/+2/…./…/..               21 W   AERO 18 W   RMY 20

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

9/01  73/56/65/-3/0.00/…/..                21 ENE AERO 14 ENE RMY 18
9/02  75/57/66/-2/0.37/…/..                39 W   AERO 41 W   RMY 41
9/03  77/61/69/+2/0.00/…/..                18 S   AERO 16 S   RMY N/A
9/04  83/61/72/+5/0.00/…/..                30 SW  AERO 28 SW  RMY 30
9/05  68/54/61/-6/0.00/…/..                23 NW  AERO 17 NW  RMY N/A
9/06  65/56/61/-6/…./…/..                37 ENE AERO 36 ENE RMY 36

9/07 Low temp since midnight is 51F; normal low is 58F

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

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

RECORDS FOR SEPTEMBER 8
HIGH 97F IN 2015
LOW 42F IN 1978
PRECIP 1.51 INCHES IN 2011
PEAK GUST 45 MPH S IN 2012

TODAY’S REPORT PREPARED BY: Benjamin Turner and Andrew Swanson

Category: Daily Discussions

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