Sunday, September 5, 2021

| September 5, 2021 | Reply

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

SUNDAY, SEPTEMBER 5, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0514E
SUNSET:  1811E
 
LOTS OF CLOUDS TODAY WITH A FEW SHOWERS….

Clouds have been the theme today with a few showers moving through
the region this morning. 0.02″ of rain was measured in the gauge
at 1 P.M.

Humidity levels have been on the increase today, rising to the mid
60s early this afternoon. With the dry air of the past couple of
days, the change today is rather noticeable.

The wind had been generally light out of the south all morning, but
has been increasing a bit this afternoon with gusts over 25 mph at
times.

The high so far today is 70F, this is 7 degrees below the daily
normal maximum of 77F. The low so far today is 60F, which is
1 degree above the daily normal minimum of 59F.


PRELIMINARY STATS FOR AUGUST 2021

TEMPERATURE, Deg. F
Avg. Max. 81.6 [+1.4]
Avg. Min. 65.4 [+2.8]
Mean      73.5 [+2.1]
24-hour corrected mean: 72.6
Max. for month: 92F on the 13th
Min. for month: 58F on the 1st

HEATING DEGREE DAYS
Total heating units:      0 [-11]
Total for the season:    28 [+25]
Total for last season:    3

COOLING DEGREE DAYS
Total cooling units:     271 [+62]
Total for the season:    650 [+54]
Total for last season:   757

PRECIPITATION, Inches
Total: 5.37 [+1.46]
Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed:  8.8 mph
Avg. corrected wind speed:    9.5 mph
Prevailing wind direction:   SSW [14%]
Peak gust and direction:     47 ESE on the 22nd

SUNSHINE:
Campbell-Stokes card minutes: 12612 minutes of a possible 24780, or 51%
Astronomical total minutes: 13116 minutes of a possible 25728, or 51%

Today’s Observations:

7 A.M.
Weather: Broken altocumulus, broken cirrostatus, overcast cirrus,
few stratocumulus distant E-SSE, few mammatus E
Temperature: 61F; Dew Point: 60F; Relative Humidity: 96%
Wind: SSW @ 8 kts
Sea-level pressure: 1013.7 mb; 29.94 in. Hg; rising then falling
Visibility: 40 miles
6-hr Max temp: 61F
6-hr Min temp: 60F
24-hr Precip: 0.00 ins.
BHO SA 1155 E150 BKN 200 BKN 250 OVC 40 137/61/60/2008/994/ FEW SC DSNT E-SSE
FEW MAMMATUS E THN K LYR ALNG HRZN SW-NNW/ 8/557 58003 10061 20060

10 A.M.
Weather: Scattered stratocumulus, broken nimbostratus, overcast cirrostratus,
few stratus fractus all quadrants
Temperature: 65F; Dew Point: 63F; Relative Humidity: 93%
Wind: SSW @ 7 kts
Sea-level pressure: 1014.0 mb; 29.94 in Hg; falling, then rising
Visibility: 15 miles, 35 miles ESE-SSE
3-hr Precip: 0.01 ins.
BHO SA 1455 45 SCT E120 BKN 200 OVC 15RW- 140/65/63/2007/994/
FEW BINOVC DSNT ESE-SSE FEW STFRA ALQDS HIER CLDS VSBL DSNT ESE-SSE
VSBY 35 ESE-SSE RW-B34/ 8/727 50003 6001/

1 P.M.
Weather: Scattered stratocumulus, overcast altostratus, few breaks in
overcast distant E-S
Temperature: 69F, Dew point: 64F; Relative Humidity: 84%
Wind: S @ 13 kts
Sea-level pressure: 1012.8 mb; 29.91 in Hg; falling, then more rapidly
Visibility: 35 miles, hazy
6-hr Max temp: 70F
6-hr Min temp: 61F
6-hr Precip: 0.02 ins.
BHO SA 1755 20 SCT 110 OVC 35 128/69/64/1913/991/ FEW BINOVC DSNT E-S
HIER CLDS VSBL DSNT E-S HAZY/ 8/52/ 58012 6002/ 10070 20061

SUMMARY FOR SATURDAY, SEPTEMBER 4, 2021

TEMPERATURE (DEGREES F)
MAX…….76     NORMAL…..77
MIN…….55     NORMAL…..59
MEAN……66     NORMAL…..68

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………-2
TOTAL DEPARTURE FOR THE MONTH……………………-21 [-5.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………….8  DEPARTURE……..+4
TOTAL HEATING UNITS FOR THE SEASON…………..36  DEPARTURE…….+14
TOTAL HEATING UNITS LAST SEASON TO DATE……….4  DEPARTURE…….+32

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….1  DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE MONTH…………….1  DEPARTURE…….-17
TOTAL COOLING UNITS FOR THE SEASON………….651  DEPARTURE…….+37
TOTAL COOLING UNITS LAST SEASON TO DATE……..773  DEPARTURE……-122

PEAK WIND GUST (MPH):
                     Official……………….22 WNW @  3:33 A.M.
                     AEROVANE (south tower)…..21 WNW @  3:33 A.M.
                     VECTOR #2 (south tower)….25     @  3:33 A.M.
                     DAVIS #2 (south tower)…..21 WNW @  3:33 A.M.
                     ASOS………..OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
                     RMY…………OUT OF SERVICE D/T RENOVATIONS  
                     MERLIN………OUT OF SERVICE D/T RENOVATIONS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………16 WNW @  3:34 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17     @  3:33 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 NW  @  3:33 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY AVERAGE……..OUT OF SERVICE D/T RENOVATIONS

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL……. 9.5 WNW  [227 total miles]
                     VECTOR #2……………..10.3
                     DAVIS #2………………10.2 WNW
                     RMY……………..OUT OF SERVICE D/T RENOVATIONS
                     ASOS…………….OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1………..OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1…………OUT OF SERVICE D/T RENOVATIONS   

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00  DEPARTURE….-0.12
TOTAL PRECIPITATION FOR THE MONTH………….4.00  DEPARTURE….+3.54
TOTAL PRECIPITATION FOR THE YEAR………….44.34  DEPARTURE….+9.53

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   77/58/68/-5/T/589/68             23 SSW AERO 24 SSW RMY N/A
08/02   78/61/70/-3/T/821/95             28 WNW AERO 28 WNW RMY N/A
08/03   76/60/68/-5/0.00/302/35          15 N   AERO 16 N   RMY N/A
08/04   75/61/68/-5/0.71/077/09          21 ESE AERO 21 ESE RMY N/A
08/05   68/61/65/-8/1.68/000/00          28 NE  AERO 28 NE  RMY N/A
08/06   85/62/74/+1/0.00/727/85          19 S   AERO 20 WSW RMY N/A
08/07   88/66/77/+4/0.00/520/61          23 SW  AERO 23 SW  RMY N/A
08/08   80/67/74/+2/T/128/15             16 SW  AERO 16 WNW RMY N/A
08/09   75/64/70/-2/0.25/076/09          22 ENE AERO 21 NE  RMY N/A
08/10   78/63/71/-1/0.12/203/24          19 S   AERO 20 S   RMY N/A
08/11   89/70/80/+8/0.00/667/79          29 SSW AERO 28 SSW RMY N/A
08/12   91/71/81/+9/T/580/69             36 WSW AERO 37 WSW RMY N/A TSTM
08/13   92/73/83/+11/0.00/696/83         18 WSW AERO 18 WSW RMY N/A
08/14   87/69/78/+6/T/601/72             25 W   AERO 25 NNW RMY N/A
08/15   80/62/71/-1/0.00/800/96          19 NNW AERO 20 NNW RMY N/A
08/16   78/59/69/-3/0.00/564/68          15 S   AERO 15 S   RMY N/A
08/17   82/63/73/1/0.00/555/67           22 SSW AERO 23 SSW RMY N/A
08/18   86/66/76/+5/0.00/338/41          21 SSW AERO 22 SSW RMY N/A
08/19   81/69/75/+4/0.62/222/27          41 S   AERO 43 S   RMY N/A
08/20   78/70/74/+3/0.01/066/08          21 WSW AERO N/A    RMY N/A
08/21   86/69/78/+7/0.00/581/71          17 S   AERO 17 S   RMY N/A
08/22   74/66/70/-1/0.78/000/00          47 ESE AERO 48 ESE RMY N/A
08/23   83/68/76/+5/1.17/333/41          25 SSE AERO 26 SSE RMY N/A TSTM
08/24   86/67/77/+6/0.01/567/70          21 NNW AERO 21 NNW RMY N/A
08/25   89/70/80/+10/0.00/783/97         17 SW  AERO 18 SW  RMY N/A
08/26   92/72/82/+12/0.00/765/95         19 WSW AERO 18 WSW RMY N/A
08/27   89/70/80/+10/T/626/78            30 ENE AERO 30 ENE RMY N/A
08/28   70/59/65/-5/0.02/296/37          34 ENE AERO 34 ENE RMY N/A
08/29   72/59/66/-4/T/016/02             20 S   AERO 21 S   RMY N/A
08/30   84/67/76/+7/0.00/246/31          25 SW  AERO 26 SW  RMY N/A
08/31   80/65/73/+4/0.00/371/47          27 WNW AERO 28 WNW RMY N/A

RECORDS FOR THE MONTH

08/22 NEW PEAK GUST RECORD OF 47 MPH,
      BEATING THE OLD RECORD OF 44 MPH IN 1987

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   68/56/62/-7/1.47/…/..          34 NNE AERO 37 NNE RMY N/A    
09/02   71/55/63/-6/2.53/…/..          49 ENE AERO 52 ENE RMY N/A
09/03   72/52/62/-6/0.00/…/..          23 NW  AERO 23 NW  RMY N/A
09/04   76/55/66/-2/0.00/…/..          22 WNW AERO 21 WNW RMY N/A

09/05   The low since midnight is 60F, 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 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: Matt Douglas

Category: Daily Discussions

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