Sunday, September 15, 2019

| September 15, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 15, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

GREAT WEATHER WITH NORMAL TEMPERATURES AND GOOD
VISIBILITY…

Today started off with some fog that lifted before the
7 o’clock observation. Visibility remained great at 80
miles at each observation, and we have finally come out
of our cold spell with seasonal temperatures experienced
at the top of the hill. Besides some scattered clouds,
it was generally sunny and warm all day. Humidity has
dropped greatly from 100% to about 50% through the day.
Our high so far today was 77F, and our low since midnight
was 62F.

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 cirrus
Temperature: 62F; Dew Point: 62F; Wind: W at 6 kts
Sea-level pressure: 30.14 ins. Hg, rising, then more slowly
Visibility: 80 miles, looming along horizon below inversion S-N
6-hr Max temp: 65F
6-hr Min temp: 62F
24-hr Precip: 0.20 ins.
BHO SA 1155 250 SCT 80 208/62/62/2806/014/ DSNT HZ ALQDS LOOMING
ALG HRZN BLO INVSN S-N/ 8/002 51005 70020 10065 20062

10 A.M.
Weather: Scattered cirrus, few cumulus in all directions
Temperature: 70F; Dew Point: 55F; Wind: W at 8 kts,
Sea-level pressure: 30.12 ins. Hg, falling, then more quickly
Visibility: 80 miles, looming along horizon below inversion in
all directions
3-hr Precip: 0.00 ins.
BHO SA 1455 250 SCT 80 201/70/55/2708/012/ FEW CU ALQDS LOOMING
ALG HRZN BLO INVSN ALQDS/ 8/102 58007

1 P.M.
Weather: Scattered cirrus, few cumulus in all directions
Temperature: 77F; Dew Point: 55F; Wind: W at 9 kts
Sea-level pressure: 30.08 ins. Hg, falling, then more quickly
Visibility: 80 miles, looming along horizon below inversion in
all directions
6-hr Max temp: 77F
6-hr Min temp: 62F
6-hr Precip: 0.00 ins.
BHO SA 1755 250 SCT 80 185/77/55/2609/008/ FEW CU ALQDS LOOMING
ALG HRZN BLO INVSN ALQDS/ 8/102 58016 10077 20062

SUMMARY FOR SATURDAY, SEPTEMBER 14, 2019

TEMPERATURE (DEGREES F)
MAX…..69   NORMAL…..73
MIN…..49   NORMAL…..56
MEAN….59   NORMAL…..64

DEPARTURE FROM 30-YEAR NORMAL………………….-5
TOTAL DEPARTURE FOR THE MONTH…………………-29 [-1.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON AUG TO JUL)
TOTAL HEATING UNITS FOR YESTERDAY……………6   DEPARTURE………+4
TOTAL HEATING UNITS FOR THE MONTH…………..34   DEPARTURE………+6
TOTAL HEATING UNITS FOR THE SEASON………….46   DEPARTURE………-7
TOTAL HEATING UNITS LAST SEASON TO DATE……..28   DEPARTURE……..+18

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………-2
TOTAL COOLING UNITS FOR THE MONTH…………..20   DEPARTURE……..-21
TOTAL COOLING UNITS FOR THE SEASON…………639   DEPARTURE……..+61
TOTAL COOLING UNITS LAST SEASON TO DATE…….829   DEPARTURE…….-190

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..36 S   AT 12:00 P.M.
AERO…………………….37 S   AT 12:16 P.M.
ASOS…………………….36 S   AT 12:00 P.M.
DAVIS……………………38 S   AT 10:56 A.M. RMY 37
FASTEST MILE FOR YESTERDAY………………….26 S   AT 11:56 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….26 S   AT 12:20 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………26 SSW AT 11:50 A.M.
AVERAGE WIND SPEED AND DIRECTION……………15.4 SSE
ASOS……………………14.7
DAVIS…………………..14.8 S [184 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.20  DEPARTURE……+0.07
ASOS…………..0.19
TOTAL PRECIPITATION FOR THE MONTH……….0.98  DEPARTURE……-0.77
ASOS…………..0.96
TOTAL PRECIPITATION FOR THE YEAR……….38.13  DEPARTURE……+1.35
ASOS………….37.99

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  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 Low temp since midnight is 62F; normal low is 55F

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

RECORDS FOR SEPTEMBER 15
HIGH 89F IN 1931
LOW 35F IN 1913
PRECIP 3.93 INCHES IN 1904 (Extra-tropical storm making landfall in New England on 9/15/1904 passing east of BHO and bringing a storm total of 4.11 inches 9/14-15/1904)
PEAK GUST 65e MPH NW, WSW IN 1944 (In the wake of Great Atlantic Hurricane)

RECORDS FOR SEPTEMBER 16
HIGH 91F IN 1939,1941
LOW 39F IN 1984
PRECIP 5.12 INCHES IN 1933 (Hurricane)
PEAK GUST 59 MPH SSE IN 1999

TODAY’S REPORT PREPARED BY: Samantha Richard

Category: Daily Discussions

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