Wednesday, September 8, 2021

| September 8, 2021 | Reply

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

WEDNESDAY, SEPTEMBER 8, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0517E
SUNSET:  1806E
 
INCREASINGLY WINDY WITH LIMITED VISIBILITY, YET COMFORTABLE
WEATHER AT THE SUMMIT….

Today we observed around 35 miles of visibility due to haze,
and almost cloudless skies by noontime.

Wind has been the main feature, reaching 35 mph by the 1 P.M.
observation. Pressure is dropping and cloud cover is increasing
at this point. The average wind speed at this point is almost
20 mph!

The air is comfortably dry with the dew point hanging out in
the low 60s. There’s a nice, cool breeze.

The high so far today is 81F, this is 5 degrees above the daily
normal maximum of 76F. The low so far today is 61F, which is 3
degrees above the daily normal minimum of 58F.


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: Scattered cumulus and cirrus, few distant stratus fractus
SW-NW
Temperature: 67F; Dew Point: 64F; Relative Humidity: 90%
Wind: S @ 13 kts
Sea-level pressure: 1014.1 mb; 29.95 in. Hg; rising, then more slowly
Visibility: 30 miles, thin fog
6-hr Max temp: 67F
6-hr Min temp: 61F
24-hr Precip: 0.00 ins.
BHO SA 1155 65 SCT 250 SCT 30 141/67/64/1813/995/ FEW STFRA DSNT SW-NW
THN F ALQDS/ 8/801 53003 10067 20061

10 A.M.
Weather: Clear, few cumulus, altocumulus, and cirrus
Temperature: 77F; Dew Point: 65F; Relative Humidity: 67%
Wind: SSW @ 12G18 kts
Sea-level pressure: 1013.8 mb; 29.94 in Hg; falling unsteadily
Visibility: 30 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 30 138/77/65/2212G18/994/ FEW CU/AC/CI ALQDS HAZY/
8/171 57003

1 P.M.
Weather: Scattered altocumulus, few cumulus
Temperature: 80F, Dew point: 62F; Relative Humidity: 54%
Wind: S @ 17G28 kts, peak of 35 mph at 12:33 P.M.
Sea-level pressure: 1012.2 mb; 29.89 in Hg; falling, then more rapidly
Visibility: 35 miles, hazy
6-hr Max temp: 81F
6-hr Min temp: 67F
6-hr Precip: 0.00 ins.
BHO SA 1755 70 SCT 35 122/80/62/1917G28/989/ FEW CU ALQDS HAZY PK WND
1930/33/ 8/180 56016 10081 20067  

SUMMARY FOR TUESDAY, SEPTEMBER 7, 2021

TEMPERATURE (DEGREES F)
MAX…….78     NORMAL…..76
MIN…….57     NORMAL…..59
MEAN……68     NORMAL…..67

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………… +1
TOTAL DEPARTURE FOR THE MONTH……………………-19 [-2.9 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………0
TOTAL HEATING UNITS FOR THE SEASON…………..36  DEPARTURE…….+10
TOTAL HEATING UNITS LAST SEASON TO DATE……….4  DEPARTURE…….+32

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….3  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH……………11  DEPARTURE…….-19
TOTAL COOLING UNITS FOR THE SEASON………….661  DEPARTURE…….+35
TOTAL COOLING UNITS LAST SEASON TO DATE……..782  DEPARTURE……-121

PEAK WIND GUST (MPH):
                     Official……………….23 WSW @ 12:54 P.M.
                     AEROVANE (south tower)…..22 WSW @ 12:53 P.M.
                     VECTOR #2 (south tower)….24     @ 12:54 P.M.
                     DAVIS #2 (south tower)…..22 W   @ 12:55 P.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 W   @ 12:17 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16     @  6:11 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 WNW @ 12:19 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……..9.3 W   [224 total miles]
                     VECTOR #2……………..10.3
                     DAVIS #2………………10.1 W
                     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………….4.04  DEPARTURE….+3.21
TOTAL PRECIPITATION FOR THE YEAR………….44.38  DEPARTURE….+9.20

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   72/60/66/-2/0.04/…/..          27 S   AERO 29 S   RMY N/A
09/06   80/61/71/+3/0.00/…/..          24 WNW AERO 25 WNW RMY N/A
09/07   78/57/68/+1/0.00/…/..          23 WSW AERO 22 WSW RMY N/A

09/08   The low since midnight is 61F, 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 8
HIGH 97F IN 2015
LOW 42F IN 1978
PRECIP 1.51 INCHES IN 2011
PEAK GUST 45 MPH S IN 2012

RECORDS FOR SEPTEMBER 9
HIGH 92F IN 2015
LOW 41F IN 1938
PRECIP 1.97 INCHES IN 1969
PEAK GUST 52 MPH WNW IN 1969, NW IN 1978

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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