Tuesday, September 10, 2019

| September 10, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, SEPTEMBER 10, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST WITH LIMITED VISIBILITY AND SOME
PASSING AFTERNOON SHOWERS….

Visibility was low this morning due to fog,
only 15 miles on average. We observed a maximum
visibility of 45 miles so far today. Conditions
have been mostly cloudy, becoming overcast after
the 1 P.M. observation. Wind has been light and
easterly, with a max gust around 15 mph. Some
showers passed the observatory to the south
between 2 P.M. and 3 P.M. The high so far today
is 71F, 3 degrees below the daily normal of 74F.
The low since midnight is 57F, the same as the
average minimum.

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, few distant lower stratocumulus
offshore
Temperature: 65F; Dew Point: 58F; Wind: Calm
Sea-level pressure: 30.40 ins. Hg, rising, then more slowly
Visibility: 15 miles, except 10 miles W-NW-NNE due to fog
6-hr Max temp: 63F
6-hr Min temp: 57F
24-hr Precip: 0.00 ins.
BHO SA 1155 E10 BKN 15 293/65/58/0000/040/ FEW DSNT LWR
SC OFFSHR FOG VSBY W-NW-NNE 10 WND CALM/ 8/400 53016
10063 20057

10 A.M.
Weather: Broken cumulus, broken altostratus
Temperature: 69F; Dew Point: 58F; Wind: E at 7 kts
Sea-level pressure: 30.40 ins. Hg, falling then rising
Visibility: 45 miles, distant haze
3-hr Precip: 0.00 in.
BHO SA 1455 E50 BKN 70 BKN 45 295/69/58/1007/040/
DSNT HZ ALQDS/ 8/260 50002

1 P.M.
Weather: Broken cumulus, broken altostratus
Temperature: 68F; Dew Point: 60F; Wind: WSW at 4 kts,
Wind: Light and variable
Sea-level pressure: 30.36 ins. Hg, falling steadily
Visibility: 45 miles
6-hr Max temp: 71F
6-hr Min temp: 59F
BHO SA 1755 E50 BKN 140 BKN 45 282/68/60/2404/036/
VIRGA SW-WSW WND L/V/ 8/220 58013 10071 20059

SUMMARY FOR MONDAY, SEPTEMBER 9, 2019

TEMPERATURE (DEGREES F)
MAX…..71   NORMAL…..74
MIN…..54   NORMAL…..57
MEAN….63   NORMAL…..65

DEPARTURE FROM 30-YEAR NORMAL………………….-3
TOTAL DEPARTURE FOR THE MONTH…………………-21 [-2.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………2   DEPARTURE……….0
TOTAL HEATING UNITS FOR THE MONTH…………..16   DEPARTURE……..-15
TOTAL HEATING UNITS FOR THE SEASON………….28   DEPARTURE……..+67
TOTAL HEATING UNITS LAST SEASON TO DATE……..12   DEPARTURE……..+16

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………-3
TOTAL COOLING UNITS FOR THE MONTH…………..12   DEPARTURE……..-18
TOTAL COOLING UNITS FOR THE SEASON…………631   DEPARTURE……..+64
TOTAL COOLING UNITS LAST SEASON TO DATE…….822   DEPARTURE…….-191

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..16 SE  AT  2:56 P.M.
AERO…………………….16 SE  AT  8:05 P.M.
ASOS…………………….16 SE  AT  2:58 P.M.
DAVIS……………………16 SE  AT  2:57 P.M. RMY 16
FASTEST MILE FOR YESTERDAY………………….11 ESE AT  2:56 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….12 SE  AT  2:57 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………12 SE  AT  2:56 P.M.
AVERAGE WIND SPEED AND DIRECTION……………7.3 NNE
ASOS……………………7.9
DAVIS…………………..7.8 ENE [84 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.67  DEPARTURE……-0.42
ASOS…………..0.67
TOTAL PRECIPITATION FOR THE YEAR……….37.82  DEPARTURE……+1.70
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/+2/0.34/367/43               32 SSW AERO 35 SSW RMY 35
8/08  84/67/76/+4/0.44/588/69               30 SW  AERO 24 WNW RMY 29
8/09  82/63/73/+1/0.00/815/96               28 NW  AERO 25 NW  RMY 26
8/10  78/59/69/-2/0.00/720/85               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/T/452/54                  24 ENE AERO 22 ENE RMY 22
8/15  77/59/68/-3/0.02/568/68               17 ESE AERO 15 SSE RMY 16
8/16  78/61/70/-1/0.00/740/89               20 E   AERO 17 ESE RMY 18
8/17  78/67/73/+2/0.01/099/12               14 SE  AERO 15 SE  RMY 15
8/18  88/70/79/+8/0.00/529/64               18 SSW AERO 18 SSW RMY 21
8/19  92/69/81/+11/0.03/536/65              25 WSW AERO 23 WSW RMY 25
8/20  87/66/77/+7/0.00/797/97               18 W   AERO 14 WSW RMY N/A
8/21  85/68/77/+7/0.12/287/35               33 SW  AERO 32 SW  RMY 33
8/22  88/68/78/+8/0.00/522/64               25 W   AERO 21 W   RMY 26
8/23  78/60/69/-1/0.04/016/02               23 N   AERO 18 N   RMY 24
8/24  72/55/64/-6/0.00/803/99               25 ENE AERO 21 ENE RMY 22
8/25  66/56/61/-8/0.00/590/73               31 ENE AERO 25 ENE RMY 29
8/26  71/51/61/-8/0.00/717/89               25 NE  AERO 21 NE  RMY 25
8/27  77/54/66/-3/0.00/530/66               18 SSW AERO 18 SSW RMY 17
8/28  78/59/69/0/0.66/184/23                21 SSE AERO 18 SSE RMY 20
8/29  83/63/73/+4/0.15/614/77               25 WNW AERO 21 WNW RMY 26
8/30  84/59/72/+4/0.00/739/93               30 SW  AERO 30 SW  RMY 28
8/31  79/61/70/+2/0.00/602/76               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  70/51/61/-5/0.00/…/..                37 N   AERO 37 N   RMY N/A
9/08  73/53/63/-3/0.00/…/..                25 W   AERO 21 W   RMY N/A
9/09  71/54/63/-3/0.00/…/..                17 SE  AERO 16 SE  RMY 16

9/10 Low temp since midnight is 57F; normal low is 57F

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

RECORDS FOR SEPTEMBER 10
HIGH 90F IN 1931,1989
LOW 41F IN 1956
PRECIP 5.60 INCHES IN 1999 (DAILY RECORD FOR SEPTEMBER)
PEAK GUST 48 MPH NW IN 1972

RECORDS FOR SEPTEMBER 11
HIGH 93F IN 1983, 2013
LOW 37F IN 1917
PRECIP 5.23 INCHES IN 1954 (HURRICANE EDNA)
PEAK GUST 101 MPH NW IN 1954 (HURRICANE EDNA)

TODAY’S REPORT PREPARED BY: Benjamin Turner and Matt Douglas

Category: Daily Discussions

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