Friday, September 4, 2020

| September 6, 2020 | Reply

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

FRIDAY, SEPTEMBER 4, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A SHARP TURN AROUND FROM YESTERDAY…

Much improved since yesterday’s dreary weather. Clear†skies
dominated for much of the morning yielding to scattered fair
weather cumulus in the afternoon. This is allowing for plentiful
sunshine – nice to see†our sun card is finally burning once
again after a 2-day hiatus.

We opened the day with a visibility of 45 miles increasing
to 75 miles by the early afternoon compliments of a cold front
that swept through the region around noontime ushering
in a drying westerly wind- yesterday’s dew point capped out
around 72 degrees! At the latest observation, 61 was the
calculated dew point and falling. It looks like the air will
continue to dry out as we head deeper into the day priming
us for a very comfortable and splendid Labor Day weekend!
Enjoy it!

The high so far today is 82F, 6 degrees above the daily
normal max of 76F. The low since midnight is 67F, which is
8 degrees above the normal low of 59F.

Today’s Observations:

7 A.M.
Weather: Clear (few altocumulus offshore E-SE)
Temperature: 69F; Dew Point: 66F; Relative Humidity: 90%
Wind: W at 9 kts
Sea-level pressure: 29.80 ins. Hg: rising steadily
Visibility: 45 miles, distant fog
6-hr Max temp: 69F
6-hr Min temp: 67F
24-hr Precip: 0.03 ins.
BHO SA 1155 CLR 45 092/69/66/2709/980/ FEW AC OFFSHR DSNT E-SE
THN F ALQDS/ 8/030 53008 70003 10069 20067

10 A.M.
Weather: Clear (few cumulus distant SW-NW, few cirrus distant
W-NW)
Temperature: 79F; Dew Point: 66F; Relative Humidity: 66%
Wind: WNW at 8 kts
Sea-level pressure: 29.85 ins. Hg: rising then more slowly
Visibility: 45 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 45 109/79/66/3008/985/ FEW CU DSNT SW-NW
FEW CI DSNT W-NW HAZY/ 8/101 51017

1 P.M.
Weather: Scattered Cumulus, Scattered Cirrus
Temperature: 82F; Dew Point: 61F; Relative Humidity: 51%
Wind: WNW 14G16 kts
Sea-level pressure: 29.86 ins. Hg: rising unsteadily
Visibility: 75 miles
6-hr Max temp: 82F
6-hr Min temp: 69F
6-hr Precip: 0.00 ins.
BHO SA 1755 45 SCT 250 75 111/82/61/2914G16/986/ 8/101 52002
10082 20069

SUMMARY FOR THURSDAY, SEPTEMBER 3, 2020†

TEMPERATURE (DEGREES F)
MAX…..75 † NORMAL…..76
MIN…..66 † NORMAL…..59
MEAN….71 † NORMAL…..67

DEPARTURE FROM 30-YEAR NORMAL……………. +4
TOTAL DEPARTURE FOR THE MONTH…………….  0 [-0.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY………… †6 †DEPARTURE……+2
TOTAL COOLING UNITS FOR THE MONTH………… †9 †DEPARTURE……-2
TOTAL COOLING UNITS FOR THE SEASON………..766 †DEPARTURE….+218
TOTAL COOLING UNITS LAST SEASON TO DATE……627 †DEPARTURE….+139

PEAK GUST AND AVERAGE WIND SPEED (MPH)†
PEAK WIND GUST FOR YESTERDAY………………..22 SSW AT †12:13 A.M. †
† † † † † † † † † †AERO…………………….21 SSW AT †12:07 A.M.†
† † † † † † † † † †ASOS…………………….22 SSW AT †12:12 A.M.
† † † † † † † † † †DAVIS……………………23 S † AT †12:09 A.M.
† † † † † † † † † †RMY n/a †MERLIN n/a
FASTEST MILE FOR YESTERDAY………………….16 SSW AT †12:13 A.M.†
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 SSW AT †12:13 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………16 SSW AT †12:13 A.M.
AVERAGE WIND SPEED AND DIRECTION………….. 7.0 SSW† † † † ††
† † † † † † † † † †ASOS………………….. 7.3
† † † † † † † † † †DAVIS…………………. 7.0 †SW [215 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.03 †DEPARTURE….-0.09
† † † † † † † † † † † † †ASOS…………..0.04
TOTAL PRECIPITATION FOR THE MONTH……….0.22 †DEPARTURE….-0.12
† † † † † † † † † † † † †ASOS…………..0.24
TOTAL PRECIPITATION FOR THE YEAR……….33.03 †DEPARTURE….-2.33
† † † † † † † † † † † † †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/…/.. † † † † † † 18 S † †AERO 21 S † †RMY 19
08/02 †85/69/77/+5/0.02/…/.. † † † † † † 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/…/.. † † † † † †31 SSW †AERO 35 SSW †RMY 31 †TSTM
08/12 †93/74/84/+13/0.00/…/.. † † † † † †22 SSW †AERO 22 SW † RMY 19
08/13 †88/71/80/+9/0.00/…/.. † † † † † † 18 ENE †AERO 18 NE † RMY 18
08/14 †82/67/75/+4/0.00/…/.. † † † † † † 23 ENE †AERO 23 ENE RMY N/A
08/15 †67/62/65/-6/T/…/.. † † † † † † † †33 NNE †AERO 32 NNE †RMY N/A
08/16 †69/62/66/-5/…./…/.. † † † † † † 26 ENE †AERO 28 ENE †RMY 26
08/17 †73/59/66/-5/…./…/.. † † † † † † 25 NE † AERO 24 NE † RMY N/A
08/18 †84/63/74/+3/…./…/.. † † † † † † 23 W † †AERO 23 W † †RMY 24
08/19 †81/59/70/0/0.03/…/.. † † † † † † †26 W † †AERO 28 W † †RMY 27
08/20 †80/56/68/-2/0.00/…/.. † † † † † † 22 W † †AERO 21 W † †RMY 22†
08/21 †88/61/75/+5/0.00/…/.. † † † † † † 28 SW † AERO 26 SW † RMY 28
08/22 †85/66/76/+6/0.26/…/.. † † † † † † 18 NNE †AERO 16 S † †RMY 16
08/23 †89/63/76/+6/2.21/…/.. † † † † † † 60 WNW †AERO 53 WNW †RMY 58 †TSTM HAIL
08/24 †87/67/77/+7/0.00/…/.. † † † † † † 18 S † †AERO 18 S † †RMY 19 †TSTM
08/25 †86/65/76/+7/0.01/…/.. † † † † † † 35 NNW †AERO 37 NNW †RMY 35
08/26 †74/56/65/-4/0.00/…/.. † † † † † † 29 NW † AERO 32 NW † RMY N/A
08/27 †68/57/63/-6/0.33/…/.. † † † † † † 18 SSE †AERO 20 SSE †RMY 20 †TSTM
08/28 †80/59/70/+1/0.00/…/.. † † † † † † 20 W † †AERO 20 W † †RMY N/A
08/29 †74/65/70/+1/0.06/…/.. † † † † † † 32 W † †AERO 32 W † †RMY N/A
08/30 †75/57/66/-2/0.00/…/.. † † † † † † 36 W † †AERO 36 W † †RMY N/A
08/31 †75/54/65/-3/0.00/…/.. † † † † † † 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 The low since midnight is 67F, the daily normal low is 59F

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

RECORDS FOR SEPTEMBER 4
HIGH 90F IN 1953, 1973
LOW 46F IN 1987
PRECIP 3.22 INCHES IN 1922
PEAK GUST 47 MPH SE IN 1966

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

TODAY’S REPORT PREPARED BY: Andrew Swanson

Category: Daily Discussions

Leave a Reply