Saturday, September 5, 2020

| September 6, 2020 | Reply

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

SATURDAY, SEPTEMBER 5, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR WEATHER WITH GREAT VISIBILITY ATOP
GREAT BLUE HILL….

Today started almost clear and cool, with a visibility
of 80 miles. Clouds began to fill the sky after noontime,
with conditions now being partly cloudy. Relative humidity
is around 35%, with dew points in the mid to upper 40’s.
This makes for a cool, fall-like day; with better visibility
than the day prior. Wind remained westerly at an average of
14 mph, with 23 mph being the max as of yet.

The high so far today is 75F, a degree below the daily
normal max of 76F. The low since midnight is 55F, which is
3 degrees below the normal low of 58F.

Today’s Observations:

7 A.M.
Weather: Few cumulus and cirrus
Temperature: 59F; Dew Point: 49F; Relative Humidity: 68%
Wind: WNW at 8 kts
Sea-level pressure: 30.16 ins. Hg: rising steadily
Visibility: 80 miles
6-hr Max temp: 62F
6-hr Min temp: 55F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 80 214/59/49/3008/016/ FEW CU/CI ALQDS/
8/101 53022 10062 20055

10 A.M.
Weather: Few cumulus and cirrus
Temperature: 69F; Dew Point: 48F; Relative Humidity: 55%
Wind: WNW at 11G19 kts
Sea-level pressure: 30.18 ins. Hg: rising then more slowly
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 80 219/69/48/3011G19/018/ FEW CU/CI ALQDS/
8/101 50005

1 P.M.
Weather: Scattered Cumulus, Scattered Cirrus
Temperature: 74F; Dew Point: 46F; Relative Humidity: 36%
Wind: W 9G18 kts
Sea-level pressure: 30.15 ins. Hg: falling unsteadily
Visibility: 80 miles
6-hr Max temp: 75F
6-hr Min temp: 59F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 250 SCT 80 211/74/46/2609G18/015/ 8/101
58008 10075 20059

SUMMARY FOR FRIDAY, SEPTEMBER 4, 2020

TEMPERATURE (DEGREES F)
MAX…..82   NORMAL…..76
MIN…..62   NORMAL…..59
MEAN….72   NORMAL…..67

DEPARTURE FROM 30-YEAR NORMAL……………. +5
TOTAL DEPARTURE FOR THE MONTH…………….  5 [+0.4 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………  7  DEPARTURE……+3
TOTAL COOLING UNITS FOR THE MONTH………… 16  DEPARTURE…….1
TOTAL COOLING UNITS FOR THE SEASON………..773  DEPARTURE….+221
TOTAL COOLING UNITS LAST SEASON TO DATE……634  DEPARTURE….+139

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..26 WNW AT  2:00 P.M.
AERO…………………….26 WNW AT  3:17 P.M.
ASOS…………………….26 W   AT  2:00 P.M.
DAVIS……………………26 W   AT  1:33 P.M.
RMY 25  MERLIN 25
FASTEST MILE FOR YESTERDAY………………….17 WNW AT  6:25 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 WNW AT  2:00 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………18 W   AT  1:24 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..11.2 WNW
ASOS…………………..10.9
DAVIS………………….11.5 WNW [287 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE….-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.22  DEPARTURE….-0.24
ASOS…………..0.24
TOTAL PRECIPITATION FOR THE YEAR……….33.03  DEPARTURE….-2.45
ASOS………….33.82

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

08/01  87/66/77/+5/0.00/866/100            18 S    AERO 21 S    RMY 19
08/02  85/69/77/+5/0.02/320/37             36 S    AERO 37 S    RMY 38
08/03  91/75/83/+11/0.00/715/83            36 WSW  AERO 38 SW   RMY 36
08/04  83/71/77/5/0.21/094/11              67 SSE  AERO 71 S    RMY 70
08/05  90/68/79/+7/0.00/668/78             28 SW   AERO 30 SW   RMY 29
08/06  84/65/75/3/0.00/701/82   20 W    AERO 17 W    RMY 19
08/07  79/65/72/0/T/136/16                 16 NE   AERO 16 NE   RMY N/A
08/08  83/64/74/+2/0.00/612/72             20 S    AERO 20 S    RMY 19
08/09  90/65/78/+6/0.00/661/78             26 SSW  AERO 26 SSW  RMY 26
08/10  94/69/82/+11/0.00/727/86            22 W    AERO 20 W    RMY 20
08/11  92/72/82/+11/0.00/708/84            31 SSW  AERO 35 SSW  RMY 31  TSTM
08/12  93/74/84/+13/0.00/647/77            22 SSW  AERO 22 SW   RMY 19
08/13  88/71/80/+9/0.00/528/63             18 ENE  AERO 18 NE   RMY 18
08/14  82/67/75/+4/0.00/618/74             23 ENE  AERO 23 ENE RMY N/A
08/15  67/62/65/-6/T/000/00                33 NNE  AERO 32 NNE  RMY N/A
08/16  69/62/66/-5/…./000/00             26 ENE  AERO 28 ENE  RMY 26
08/17  73/59/66/-5/…./339/41             25 NE   AERO 24 NE   RMY N/A
08/18  84/63/74/+3/…./784/95             23 W    AERO 23 W    RMY 24
08/19  81/59/70/0/0.03/526/64              26 W    AERO 28 W    RMY 27
08/20  80/56/68/-2/0.00/804/98             22 W    AERO 21 W    RMY 22
08/21  88/61/75/+5/0.00/719/88             28 SW   AERO 26 SW   RMY 28
08/22  85/66/76/+6/0.26/521/64             18 NNE  AERO 16 S    RMY 16
08/23  89/63/76/+6/2.21/552/68             60 WNW  AERO 53 WNW  RMY 58  TSTM HAIL
08/24  87/67/77/+7/0.00/493/61             18 S    AERO 18 S    RMY 19  TSTM
08/25  86/65/76/+7/0.01/492/61             35 NNW  AERO 37 NNW  RMY 35
08/26  74/56/65/-4/0.00/780/97             29 NW   AERO 32 NW   RMY N/A
08/27  68/57/63/-6/0.33/008/01             18 SSE  AERO 20 SSE  RMY 20  TSTM
08/28  80/59/70/+1/0.00/559/70             20 W    AERO 20 W    RMY N/A
08/29  74/65/70/+1/0.06/000/00             32 W    AERO 32 W    RMY N/A
08/30  75/57/66/-2/0.00/793/100            36 W    AERO 36 W    RMY N/A
08/31  75/54/65/-3/0.00/569/72             20 S    AERO 20 S    RMY 20

DAILY RECORDS FOR AUGUST 2020

8/23/20: DAILY RECORD HIGH MAXIMUM TEMPERATURE OF 89F,
BREAKS PREVIOUS RECORD of 88F SET IN 1918, 1947, 1949, 1996

8/23/20: DAILY RECORD PRECIPITATION OF 2.21 INS,
BREAKS PREVIOUS RECORD OF 2.09 INS SET IN 2010

8/23/20: DAILY RECORD PEAK WIND GUST OF 60 MPH,
TIES PREVIOUS RECORD OF 60 MPH SET IN 1940

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

09/01  76/59/68/0/0.00/…/..              22 SSE  AERO 21 SE   RMY 20
09/02  69/59/64/-4/…/…/..              23 SSE  AERO 23 SSE  RMY 24
09/03  75/66/71/+4/…/…/..              22 SSW  AERO 21 SSW  RMY n/a
09/04  82/62/72/+5/0.00/…/..             26 WNW  AERO 26 WNW  RMY 25

09/05 The low since midnight is 55F, the daily normal low is 58F

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

RECORDS FOR SEPTEMBER 5
HIGH 90F IN 1971
LOW 45F IN 1906
PRECIP 1.37 INCHES IN 1907
PEAK GUST 46 MPH NW IN 1994

RECORDS FOR SEPTEMBER 6
HIGH 92F IN 1900, 2018
LOW 39F IN 1888
PRECIP 3.19 INCHES IN 1890
PEAK GUST 78e MPH SE IN 1979 (TROPICAL STORM DAVID)

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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