Wednesday, September 11, 2019

| September 11, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 11, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

WARMER AND MORE HUMID TODAY WITH A GUSTY
BREEZE….

Definitely doesn’t feel as comfortable today as
it has in recent days, as the dew point has been
rising through the day. Current values have reached
into the mid 60s. Temperatures were held mainly in
the 70s through late morning due to the abundance of
cloud cover the first half of the day, however an
abundance of sunshine developed for a time late this
morning into early afternoon.

The other story up here has been the wind, with
gusts just over 30mph early this morning out of
south-southwest. A gradual decrease in the wind has
been occurring into this afternoon.

The high so far today is 80F, 7 degrees above the
daily normal of 73F.
The low since midnight is 63F, 7 degrees above
average minimum of 56 degrees.

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 stratocumulus, broken altocumulus
Temperature: 68F; Dew Point: 63F; Wind: SW at 19 kts
gusting to 26 kts
Sea-level pressure: 30.15 ins. Hg, falling, then more rapidly
Visibility: 30 miles
6-hr Max temp: 68F
6-hr Min temp: 64F
24-hr Precip: 0.00 ins.
BHO SA 1155 E20 BKN 110 BKN 30 211/68/63/2219G26/015/
PK WND 2227/28 8/530 58009 10068 20064

10 A.M.
Weather: Overcast altocumulus, few breaks in overcast
Temperature: 74F; Dew Point: 65F; Wind: SW at 15 kts
gusting to 22 kts
Sea-level pressure: 30.11 ins. Hg, falling, then more rapidly
Visibility: 30 miles
3-hr Precip: 0.00 in.
BHO SA 1455 E120 OVC 30 197/74/65/2115G22/011/ FEW CU ALQDS
FEW BINOVC OHD/ 8/13/ 58014

1 P.M.
Weather: Broken cumulus, broken cirrus
Temperature: 79F; Dew Point: 66F; Wind: W at 11 kts
gusting to 16kts
Sea-level pressure: 30.05 ins. Hg, falling, then falling slower
Visibility: 30 miles
6-hr Max temp: 80F
6-hr Min temp: 68F
BHO SA 1755 E30 BKN 250 BKN 30 176/79/66/2611G16/005/ HAZY/
8/201 56021 10080 20068

SUMMARY FOR TUESDAY, SEPTEMBER 10, 2019

TEMPERATURE (DEGREES F)
MAX…..73   NORMAL…..74
MIN…..57   NORMAL…..57
MEAN….65   NORMAL…..65

DEPARTURE FROM 30-YEAR NORMAL………………….0
TOTAL DEPARTURE FOR THE MONTH…………………-21 [-2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON AUG TO JUL)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-2
TOTAL HEATING UNITS FOR THE MONTH…………..16   DEPARTURE…….. -1
TOTAL HEATING UNITS FOR THE SEASON………….28   DEPARTURE……..-14
TOTAL HEATING UNITS LAST SEASON TO DATE……..18   DEPARTURE……..+10

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………-3
TOTAL COOLING UNITS FOR THE MONTH…………..12   DEPARTURE……..-20
TOTAL COOLING UNITS FOR THE SEASON…………631   DEPARTURE……..+62
TOTAL COOLING UNITS LAST SEASON TO DATE…….822   DEPARTURE…….-191

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 S   AT 11:53 P.M.
AERO…………………….25 S   AT 11:53 P.M.
ASOS…………………….26 SSW AT 11:54 P.M.
DAVIS……………………28 S   AT 11:31 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….20 S   AT 11:58 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 SSW AT 11:55 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………19 S   AT 11:55 P.M.
AVERAGE WIND SPEED AND DIRECTION……………6.8 S
ASOS……………………7.2
DAVIS…………………..6.7 S      [173 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……-0.55
ASOS…………..0.67
TOTAL PRECIPITATION FOR THE YEAR……….37.82  DEPARTURE……+1.57
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 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 Low temp since midnight is 63F; normal low is 56F

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

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)

RECORDS FOR SEPTEMBER 12
HIGH 92F IN 1961
LOW 42F IN 1958,1967,1985
PRECIP 2.79 INCHES IN 1960 (HURRICANE DONNA)
PEAK GUST 140 MPH SSE IN 1960 (HURRICANE DONNA)

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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