Friday, September 13, 2019

| September 13, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, SEPTEMBER 13, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

COOL AND FAIR WITH INCREASING VISIBILITY AND A
NICE SEA BREEZE….X

We observed a visibility of 70 miles throughout the
day. Sky conditions improved, becoming almost clear
by the 1 P.M. observation. Increasing pressure
arrived with a dry air mass, and dew points in the
low 40’s. Wind shifted from NE-E, and provided a
sea breeze that kept temperatures lower than normal.

The high so far today is 65F, 8 degrees below the
daily normal of 73F.
The low since midnight is 49F, 7 degrees below the
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      71.3 [+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 [+22]
Total for the season:  619 [+82]
Total for last season: 753

PRECIPITATION, Inches
Total: 1.83 [-2.21]
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: Scattered cumulus, broken cirrostratus
Temperature: 54F; Dew Point: 51F; Wind: NNE at 9 kts
Sea-level pressure: 30.47 ins. Hg, rising rapidly
Visibility: 65 miles
6-hr Max temp: 54F
6-hr Min temp: 49F
24-hr Precip: 0.11 ins.
BHO SA 1155 40 SCT E250 BKN 65 319/54/51/0309/047/
8/105 70011 53026 10054 20049

10 A.M.
Weather: Scattered cumulus
Temperature: 64F; Dew Point: 44F; Wind: ENE at 13 kts,
gusting to 23 kts
Sea-level pressure: 30.55 ins. Hg, rising steadily
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 40 SCT 70 342/64/44/0613G23/055/ 8/100
51023

1 P.M.
Weather: Clear, few cumulus and cirrostratus in all
directions
Temperature: 65F; Dew Point: 43F; Wind: NE at 7 kts,
gusting to 16kts
Sea-level pressure: 30.53 ins. Hg, rising then falling
Visibility: 75 miles
6-hr Max temp: 65F
6-hr Min temp: 54F
6-hr Precip: 0.00 ins.
BHO SA 1755 CLR 75 339/65/43/0407G16/053/ FEW CU/CS
ALQDS/ 8/105 56003 10065 20054

SUMMARY FOR THURSDAY, SEPTEMBER 12, 2019

TEMPERATURE (DEGREES F)
MAX…..70   NORMAL…..73
MIN…..52   NORMAL…..56
MEAN….61   NORMAL…..65

DEPARTURE FROM 30-YEAR NORMAL………………….-4
TOTAL DEPARTURE FOR THE MONTH…………………-17 [-1.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON AUG TO JUL)
TOTAL HEATING UNITS FOR YESTERDAY……………4   DEPARTURE………+1
TOTAL HEATING UNITS FOR THE MONTH…………..20   DEPARTURE………-2
TOTAL HEATING UNITS FOR THE SEASON………….28   DEPARTURE……..-15
TOTAL HEATING UNITS LAST SEASON TO DATE……..18   DEPARTURE……..+14

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………-2
TOTAL COOLING UNITS FOR THE MONTH…………..20   DEPARTURE……..-17
TOTAL COOLING UNITS FOR THE SEASON…………639   DEPARTURE……..+65
TOTAL COOLING UNITS LAST SEASON TO DATE…….826   DEPARTURE…….-187

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..29 ENE AT  7:40 A.M.
AERO…………………….28 ENE AT  7:34 A.M.
ASOS…………………….30 ENE AT  7:42 A.M.
DAVIS……………………29 E   AT  7:41 A.M. RMY 28
FASTEST MILE FOR YESTERDAY………………….21 ENE AT  7:38 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 ENE AT  7:51 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………21 ENE AT  7:57 A.M.
AVERAGE WIND SPEED AND DIRECTION……………10.7 NE
ASOS……………………11.1
DAVIS…………………..11.2 NE [43 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.11  DEPARTURE……-0.02
ASOS…………..0.10
TOTAL PRECIPITATION FOR THE MONTH……….0.78  DEPARTURE……-0.70
ASOS…………..0.77
TOTAL PRECIPITATION FOR THE YEAR……….37.93  DEPARTURE……+1.42
ASOS………….37.93

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  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 Low temp since midnight is 49F; normal low is 56F

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

RECORDS FOR SEPTEMBER 13
HIGH 91F IN 1957
LOW 40F IN 1985
PRECIP 3.10 INCHES IN 1987
PEAK GUST 44 MPH WNW IN 1986

RECORDS FOR SEPTEMBER 14
HIGH 90F IN 1931
LOW 34F IN 1911
PRECIP 4.38 INCHES IN 1944 (Great Atlantic Hurricane in 1944)
PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane in 1944)

TODAY’S REPORT PREPARED BY: Benjamin Turner and Rusty Moore

Category: Daily Discussions

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