Friday, August 6, 2021

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

FRIDAY, AUGUST 6, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0442E
SUNSET:  1857E

RAIN AND CHILL EXIT, SUN AND WARMTH RETURN….

Yesterday’s overcast and cool temperatures coincided
with a good slug of rainfall. An area of low pressure
traversing a stationary front offshore induced considerably
wet conditions. Our gauge added another 0.61″ through this 
morning bringing the storm total to a whopping 2.39″! That’s
61% of our average for the entire month of August!

Thankfully, the overnight hours turned the page. We are
seeing partly cloudy skies with abundant sunshine. Visibility
has been quite meager, however, hanging firm around 25 miles.
Winds are now southwesterly ushering in moist, tropical air.
Consequently, dew points are running in the upper-60s…summer
is back!

The high so far today is 84F, 3 degrees above the daily normal
maximum of 81F. The low so far today is 62F, which is 2 degrees
below the daily normal minimum of 64F.

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PRELIMINARY STATS FOR JULY 2021

TEMPERATURE, Deg. F
Avg. Max. 76.3 [-5.4]
Avg. Min. 60.4 [-2.5]
Mean      68.8 [-4.0]
24-hour corrected mean: 67.9
Max. for month: 90F on the 16th
Min. for month: 52F on the 31st

HEATING DEGREE DAYS
Total heating units:     28 [+21]
Total for the season:    28 [+21]
Total for last season:    1

COOLING DEGREE DAYS
Total cooling units:     153 [-95]
Total for the season:    379 [-8]
Total for last season:   487

PRECIPITATION, Inches
Total: 11.59 [+8.12]
Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed:  9.0 mph
Avg. corrected wind speed:    9.7 mph
Prevailing wind direction:   NE [14%]
Peak gust and direction:     63 NW on the 7th

SUNSHINE:
Campbell-Stokes card minutes: 11574 minutes of a possible 26682 or 43%
Astronomical total minutes: 12005 minutes of a possible 27732 or 43%

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Today’s Observations:

7 A.M.
Weather: Scattered Altocumulus
Temperature: 67F; Dew Point: 65F; Relative Humidity: 94%
Wind: WSW @ 7G11kts
Sea-level pressure: 30.17 in. Hg; rising unsteadily
Visibility: 20 miles, thin fog all quadrants
6-hr Max temp: 67F
6-hr Min temp: 62F
24-hr Precip: 0.61 ins.
BHO SA 1155 65 SCT 20 217/67/65/250711/017/ THN F ALQDS/ 8/030
52010 70061 10067 20062

10 A.M.
Weather: Clear (few cumulus SSW)
Temperature: 76F; Dew Point: 68F; Relative Humidity: 76%
Wind: W  @ 4 kts (wind light)
Sea-level pressure: 30.19 in Hg; increasing then decreasing
Visibility: 25 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 25 218/76/68/2704/019/ FEW CU SSW WND LGT HAZY/
8/100 50001

1 P.M.
Weather: Scattered Cumulus
Temperature: 83F, Dew point: 68F; Relative Humidity: 62%
Wind: SW @ 7G14 kts
Sea-level pressure: 30.15 in Hg; falling then falling more slowly
Visibility: 25 miles, hazy
6-hr Max temp: 84F
6-hr Min temp: 67F
6-hr Precip: 0.00 ins.
BHO SA 1755 45 SCT 25 210/83/68/2207G14/015/ HAZY/ 8/100
56008 10084 20067

SUMMARY FOR THURSDAY, AUGUST 5, 2021

TEMPERATURE (DEGREES F)
MAX…….68     NORMAL…..82
MIN…….61     NORMAL…..64
MEAN……65     NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………..-8
TOTAL DEPARTURE FOR THE MONTH………………….-26 [-5.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……+/-0
TOTAL HEATING UNITS FOR THE MONTH…………….0  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE SEASON…………..28  DEPARTURE…….+20
TOTAL HEATING UNITS LAST SEASON TO DATE……….1  DEPARTURE…….+27

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-8
TOTAL COOLING UNITS FOR THE MONTH……………14  DEPARTURE…….-26
TOTAL COOLING UNITS FOR THE SEASON………….393  DEPARTURE…….-23
TOTAL COOLING UNITS LAST SEASON TO DATE……..555  DEPARTURE……-162

PEAK WIND GUST (MPH):
                     Official……………….28 NE  @  8:09 A.M.
                     AEROVANE (south tower)…..28 NE  @  8:09 A.M.
                     VECTOR #2 (south tower)….30     @  8:53 A.M.
                     DAVIS #2 (south tower)…..27     @  8:09 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………………20 NNE @  8:25 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20     @  8:27 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 SE  @  8:26 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…… 8.8 NNE [211 total miles]
                     VECTOR #2……………. 9.4
                     DAVIS #2…………….. 9.0 NE
                     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…….0.61  DEPARTURE….+0.47
TOTAL PRECIPITATION FOR THE MONTH………….2.39  DEPARTURE….+1.73
TOTAL PRECIPITATION FOR THE YEAR………….37.36  DEPARTURE….+6.26

PRELIMINARY CLIMATE SUMMARY FOR JULY 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

07/01   80/65/73/+2/0.74/155/17           22 W   AERO 20 WSW  RMY 21
07/02   65/55/60/-11/1.49/000/00          37 NE  AERO 36 NE   RMY 39
07/03   56/54/55/-17/1.98/000/00          41 NE  AERO 44 NE   RMY 45 TSTM
07/04   66/54/60/-12/0.16/191/21          26 ENE AERO 23 ENE  RMY 26
07/05   74/53/64/-8/0.01/546/60           26 SSW AERO 28 SSW  RMY 27
07/06   87/66/77/+5/0.26/255/28           37 W   AERO 48 W    RMY 38 TSTM
07/07   88/88/77/+5/0.77/699/77           63 NW  AERO 75 NW   RMY 70 TSTM
07/08   67/59/63/-9/0.38/109/12           46 W   AERO 46 W    RMY 51 TSTM
07/09   73/62/68/-5/3.02/163/18           40 WNW AERO 44 WNW  RMY 43
07/10   71/63/67/-6/0.07/109/12           23 NE  AERO 21 NNE  RMY 22
07/11   81/61/71/-2/T/325/36              21 SW  AERO 19 S    RMY N/A
07/12   67/61/64/-9/1.01/000/00           31 ENE AERO 31 ENE  RMY N/A
07/13   66/60/63/-10/0.02/000/00          19 E   AERO 18 E    RMY N/A
07/14   80/62/71/-2/0.01/216/24           19 S   AERO 18 S    RMY N/A
07/15   88/67/78/+5/0.00/844/94           19 WSW AERO 18 SSW  RMY N/A
07/16   90/70/80/+7/0.04/609/68           36 NNW AERO 39 NNW  RMY N/A TSTM
07/17   78/64/71/-2/0.34/394/44           26 ENE AERO 25 ENE  RMY N/A TSTM
07/18   74/63/69/-4/0.15/000/00           22 NE  AERO 22 NE   RMY N/A TSTM
07/19   71/63/67/-6/0.07/027/03           17 ENE AERO 17 ENE  RMY N/A
07/20   83/64/74/+1/0.00/730/82           23 NW  AERO 23 NW   RMY N/A
07/21   79/62/71/-2/0.16/577/65           26 NNW AERO 23 NNW  RMY N/A TSTM
07/22   79/58/69/-4/T/656/74              20 WNW AERO 20 WNW  RMY N/A
07/23   79/62/71/-2/0.00/708/80           22 S   AERO 21 S    RMY N/A TSTM
07/24   78/59/69/-4/0.00/830/94           19 S   AERO 18 S    RMY N/A
07/25   71/64/68/-5/0.08/009/01           40 SSW AERO 41 SSW  RMY N/A
07/26   87/67/77/+4/0.01/765/87           27 WSW AERO 25 WNW  RMY N/A
07/27   87/65/76/+3/0.56/754/86           55 NW  AERO 58 NW   RMY N/A TSTM
07/28   72/61/67/-6/0.06/446/51           18 NNE AERO 18 NNE  RMY N/A
07/29   77/61/69/-4/0.19/323/37           39 S   AERO 40 S    RMY N/A
07/30   78/58/68/-5/0.01/714/82           31 NW  AERO 31 NW   RMY N/A
07/31   74/52/63/-10/0.00/851/98          24 WNW AERO 25 WNW  RMY N/A

RECORDS FOR JULY:
JULY 2: Record daily precipitation of 1.49″,
        Surpasses previous record of 1.42″ set in 1986

JULY 3: Record daily precipitation of 1.98″,
        Surpasses previous record of 1.36″ set in 1985

JULY 7: Record peak gust of 63 MPH,
        Surpasses previous record of 55 MPH set in 1989

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/…/..             23 SSW AERO 24 SSW RMY N/A
08/02   78/61/70/-3/T/…/..             28 WNW AERO 28 WNW RMY N/A
08/03   76/60/68/-5/0.00/…/..          15 N   AERO 16 N   RMY N/A
08/04   75/61/68/-5/…./…/..          21 ESE AERO 21 ESE RMY N/A
08/05   68/61/65/-8/…./…/..          28 NE  AERO 28 NE  RMY N/A

08/06 The low since midnight is 61F, the daily normal low is 64F

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

RECORDS FOR AUGUST 6
HIGH 95F IN 1931
LOW 48F IN 1934
PRECIP 1.47 INCHES IN 1995
PEAK GUST 44e MPH SSW IN 1940

RECORDS FOR AUGUST 7
HIGH 95F IN 1924
LOW 51F IN 2004
PRECIP 3.32 INCHES IN 1926
PEAK GUST 51 MPH NE 1975

TODAY’S REPORT PREPARED BY: Andrew Swanson