Tuesday, September 17, 2019

| September 17, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, SEPTEMBER 17, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

PLEASANTLY FALL-LIKE TODAY WITH A MIX OF SUN AND CLOUDS…

Plenty of sunshine this morning has turned into an interplay
of sun and clouds this afternoon. Winds have been veering through
the day starting out of the northwest early this morning to now
being east. This easterly flow is responsible for holding
temperatures in the mid 60s thus far.

The air has been nice and dry with dew points generally in the low to
mid 40s this morning, however with the onshore flow this afternoon,
dew points have risen into the low 50s, which is still comfortable.
Visibility has been as high as 80 miles during the morning, but has
slipped a bit this afternoon to around 65 miles.

Our high so far today is 67F, 4 degrees below the normal high of
71F. Our low since midnight is 49F, 5 degrees below the normal of
low of 54F.

PRELIMINARY STATS FOR AUGUST 2019

TEMPERATURE, Deg. F
Avg. Max. 80.4 [+1.2]
Avg. Min. 62.1 [+0.3]
Mean      71.3 [+0.8]
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 [+25]
Total for the season:  622 [+85]
Total for last season: 753

PRECIPITATION, Inches
Total: 1.83 [-2.20]
Greatest in 24 hrs: 0.81 ins. on the 28th-29th

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: 16404 minutes of possible 24780 or 66%
Astronomical total minutes: 17074 minutes of possible 25768 or 66%

Today’s Observations:

7 A.M.
Weather: Clear, few Cumulus distant ENE-ESE, few Altocumulus distant
N-NE
Temperature: 54F; Dew Point: 45F; Wind: NW at 11 kts
Sea-level pressure: 30.11 ins. Hg, rising steadily
Visibility: 70 miles
6-hr Max temp: 54F
6-hr Min temp: 49F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 70 196/54/45/3211/011/ FEW CU DSNT ENE-ESE
FEW AC DSNT N-NE/ 8/280/ 52014 10054 20049

10 A.M.
Weather: Scattered Cumulus, few distant Altocumulus ESE-SE
Temperature: 63F; Dew Point: 43F; Wind: N at 8 kts, gusting to 16 kts
Sea-level pressure: 30.13 ins. Hg, steady, then rising
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 50 SCT 80 202/63/43/3608G16/013/ FEW AC DSNT
ESE-SE 8/280/ 53006

1 P.M.
Weather: Broken Cumulus, broken Altocumulus
Temperature: 65F; Dew Point: 51F; Wind: E at 10 kts, gusting to 18 kts
Sea-level pressure: 30.13 ins. Hg, steady, then rising
Visibility: 65 miles
6-hr Max temp: 67F
6-hr Min temp: 54F
6-hr Precip: 0.00 ins.
BHO SA 1755 E50 BKN 80 BKN 65 204/65/51/0810G18/013/ 8/250/ 53002
10067 20054

SUMMARY FOR MONDAY, SEPTEMBER 16, 2019

TEMPERATURE (DEGREES F)
MAX…..72   NORMAL…..72
MIN…..54   NORMAL…..55
MEAN….63   NORMAL…..63

DEPARTURE FROM 30-YEAR NORMAL…………………. 0
TOTAL DEPARTURE FOR THE MONTH…………………-23 [-1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON AUG TO JUL)
TOTAL HEATING UNITS FOR YESTERDAY……………2   DEPARTURE………-2
TOTAL HEATING UNITS FOR THE MONTH…………..36   DEPARTURE………+1
TOTAL HEATING UNITS FOR THE SEASON………….48   DEPARTURE……..-12
TOTAL HEATING UNITS LAST SEASON TO DATE……..28   DEPARTURE……..+20

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………-2
TOTAL COOLING UNITS FOR THE MONTH…………..25   DEPARTURE……..-20
TOTAL COOLING UNITS FOR THE SEASON…………644   DEPARTURE……..+62
TOTAL COOLING UNITS LAST SEASON TO DATE…….829   DEPARTURE…….-185

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 WNW AT 10:26 A.M.
AERO…………………….23 WNW AT  9:45 A.M.
ASOS…………………….25 WNW AT 10:26 A.M.
DAVIS……………………24 WNW AT  9:43 A.M. RMY 25
FASTEST MILE FOR YESTERDAY………………….17 WNW AT  9:43 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 NW  AT 10:27 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………18 WNW AT  9:45 A.M.
AVERAGE WIND SPEED AND DIRECTION…………… 9.4 NW
ASOS…………………… 9.5
DAVIS………………….. 9.8 NW [324 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.98  DEPARTURE……-1.04
ASOS…………..0.96
TOTAL PRECIPITATION FOR THE YEAR……….38.13  DEPARTURE……+1.08
ASOS………….37.99

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
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  73/57/65/0/0.00/…/..                 25 S   AERO 25 S   RMY N/A
9/11  83/63/73/+8/0.00/…/..                31 SW  AERO 32 SW  RMY N/A
9/12  70/52/61/-4/0.11/…/..                29 ENE AERO 28 ENE RMY 28
9/13  65/49/57/-7/0.00/…/..                29 ENE AERO 27 ENE RMY 27
9/14  69/49/59/-5/…./…/..                36 S   AERO 37 S   RMY 37
9/15  78/62/70/+6/0.00/…/..                24 W   AERO 23 W   RMY 22
9/16  72/54/63/0/0.00/…/..                 25 WNW AERO 23 WNW RMY 25

9/17  High so far 67F, Low so far 49F

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

RECORDS FOR SEPTEMBER 17
HIGH 87F IN 2015
LOW 38F IN 1959
PRECIP 2.73 INCHES IN 1933
PEAK GUST 60 MPH WNW IN 1999

RECORDS FOR SEPTEMBER 18
HIGH 88F IN 1906
LOW 36F IN 1919
PRECIP 4.25 INCHES IN 1996
PEAK GUST 77e MPH WNW IN 1948

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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