Tuesday, August 11, 2020

| August 11, 2020 | Reply

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

TUESDAY, AUGUST 11, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER HAZY, HOT, AND HUMID DAY WITH A PASSING
THUNDERSTORM….

Hot and humid weather continues on what is day 3 of
90+ temperatures, and thus officially a heat wave.
This marks only the second heat wave of the summer
for the summit of Blue Hill, while surrounding areas
have had at least 3 so far this warm season.

A thunderstorm passed about 6-8 miles to the south
and southeast of the Observatory between 11:29 A.M.
and 12:30 P.M. Thunder could be heard and even
observed a few distant lightning bolts, however we
were not close enough to get any rain from it.
Nonetheless, today will go down as a thunderstorm day.

Otherwise sunshine mixed with cumulus, towering cumulus
and high thin cirrus clouds has been the theme today.
The dewpoint has hovered in the upper 60s to low 70s
making it feel rather miserable outside.

The rainfall deficit continues to grow, with the
month now 1.22 inches below normal, and the year
dropping to 3.14 inches below normal.

The high so far today is 92F, which is 12 degrees
above the daily normal high of 80F. The low since
midnight is 72F, which is 9 degrees above the daily
normal low of 63F.

PRELIMINARY STATS FOR JULY 2020

TEMPERATURE, Deg. F
Avg. Max. 83.5 [+2.7]
Avg. Min. 66.0 [+3.1]
Mean      74.8 [+2.9]
24-hour corrected mean: 73.6
Max. for month: 95F on the 28th
Min. for month: 57F on the 16th

COOLING DEGREE DAYS
Total cooling units:    303  [+81]
Total for the season:   487  [+136]
Total for last season:  411

PRECIPITATION, Inches
Total: 1.72 [-2.30]
Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 9.1 mph
Avg. corrected wind speed:   9.8 mph
Prevailing wind direction:   S [12%]
Peak gust and direction:     39 S on the 11th

SUNSHINE:
Campbell-Stokes card minutes: 15300 minutes of a possible 26682 or 57%
Astronomical total minutes: 15879 minutes of a possible 27720 or 57%

Today’s Observations:

7 A.M.
Weather: Scattered Stratus Fractus, scattered Altocumulus and
Altocumulus Castellanus, thin scattered Cirrus
Temperature: 75F; Dew Point: 72F; Relative Humidity: 91%
Wind: S at 7 kts
Sea-level pressure: 29.99 ins. Hg: Rising, then more slowly
Visibility: 10 miles, thin fog
6-hr Max temp: 76F
6-hr Min temp: 72F
24-hr Precip: 0.00 ins.
BHO SA 1155 5 SCT 65 SCT 250 –SCT 10 156/75/72/1907/999/
THN F ALQDS/ 8/681 51005 10076 20072

10 A.M.
Weather: Thin broken Cirrus, few Cumulus all quadrants
Temperature: 87F; Dew Point: 69F; Relative Humidity: 56%
Wind: WSW at 9G15 kts
Sea-level pressure: 30.00 ins. Hg: Rising, then steady
Visibility: 20 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 250 –BKN 20 159/87/69/2409G15/000/ FEW CU ALQDS
HAZY/ 8/201 51003

1 P.M.
Weather: Scattered Cumulus, thin broken Cirrus,
Cumulonimbus E-SE moving E, Towering Cumulus all quadrants
Temperature: 90F; Dew Point: 68F; Relative Humidity: 49%
Wind: S at 10G17 kts
Sea-level pressure: 29.97 ins. Hg: Falling, then more slowly
Visibility: 25 miles, hazy
6-hr Max temp: 92F
6-hr Min temp: 75F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 250 –BKN 25 149/90/68/1810G17/997/
CB E-SE MVG E TCU ALQDS HAZY TE30/ 8/393 56010 10092 20075

SUMMARY FOR MONDAY, AUGUST 10, 2020

TEMPERATURE (DEGREES F)
MAX…..94   NORMAL…..80
MIN…..69   NORMAL…..63
MEAN….82   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL……………..+11
TOTAL DEPARTURE FOR THE MONTH……………..+55 [+5.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………..17  DEPARTURE……+10
TOTAL COOLING UNITS FOR THE MONTH…………….124  DEPARTURE……+53
TOTAL COOLING UNITS FOR THE SEASON……………611  DEPARTURE…..+189
TOTAL COOLING UNITS LAST SEASON TO DATE……….491  DEPARTURE…..+120

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..22 W   AT  3:07 P.M.
AERO…………………….20 W   AT  3:25 P.M.
ASOS…………………….21 SW  AT  3:07 P.M.
DAVIS……………………21 SW  AT  3:00 P.M
RMY 20  MERLIN 20
FASTEST MILE FOR YESTERDAY………………….13 W   AT  3:26 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….15 W   AT  3:26 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………16 W   AT  3:25 P.M.
AVERAGE WIND SPEED AND DIRECTION…………… 9.1 WSW
ASOS…………………… 9.1
DAVIS………………….. 8.9 SW [229 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.23  DEPARTURE……-1.22
ASOS…………..0.23
TOTAL PRECIPITATION FOR THE YEAR……….29.30  DEPARTURE……-3.14
ASOS………….30.04

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  76/63/70/0/0.00/228/25              16 E    AERO 14 E    RMY 14  TSTM
07/02  86/61/74/+4/0.00/803/88             30 WSW  AERO 25 WSW  RMY 33
07/03  73/60/67/-4/0.00/091/10             30 NE   AERO 28 NE   RMY 30
07/04  79/60/70/-1/0.00/565/62             16 S    AERO 16 S    RMY 16
07/05  83/63/73/+2/0.54/373/41             24 NW   AERO 30 NW   RMY 26  TSTM
07/06  73/60/67/-4/0.00/482/53             20 ENE  AERO 16 NNE  RMY 18
07/07  78/60/69/-2/0.00/454/50             25 S    AERO 25 S    RMY 26
07/08  83/64/74/+2/0.00/227/25             32 SSW  AERO 32 SSW  RMY 32
07/09  89/70/80/+8/0.00/834/92             24 S    AERO 23 S    RMY 22
07/10  83/70/77/+5/0.05/109/12             30 SSE  AERO 32 SSE  RMY N/A
07/11  85/70/78/+6/0.00/614/68             39 S    AERO 39 S    RMY 38
07/12  86/70/78/+6/0.00/830/92             28 WSW  AERO 28 WSW  RMY 29
07/13  82/69/76/+4/0.23/306/34             30 SSE  AERO 31 SSE  RMY 30  TSTM
07/14  78/63/71/-1/0.00/369/41             26 ENE  AERO 25 ENE  RMY 26
07/15  72/59/66/-6/0.00/539/60             21 NE   AERO 21 NE   RMY N/A
07/16  73/57/65/-7/0.00/815/91             21 E    AERO 21 E    RMY 19
07/17  71/57/64/-8/0.19/027/03             24 SSW  AERO 24 SSW  RMY 25
07/18  89/66/78/+6/0.00/822/92             18 W    AERO 17 W    RMY 19
07/19  92/69/81/+9/0.00/722/81             28 S    AERO 28 S    RMY 26
07/20  91/72/82/+10/T/481/54               25 SSW  AERO 25 SSW  RMY N/A
07/21  88/68/78/+6/0.00/799/90             25 W    AERO 25 W    RMY 24
07/22  80/67/74/+2/…./275/31             16 ENE  AERO M  M    RMY 16
07/23  88/68/78/+6/0.48/203/23             31 N    AERO 32 N    RMY 31  TSTM
07/24  81/68/75/+3/0.00/476/54             15 ENE  AERO 15 ENE  RMY 16
07/25  88/67/78/+6/0.00/845/96             18 W    AERO 18 WNW  RMY N/A
07/26  89/70/80/+8/0.00/632/72             27 W    AERO 28 W    RMY 27
07/27  94/72/83/+11/0.00/823/94            23 SW   AERO 25 SW   RMY N/A
07/28  95/74/85/+13/0.01/621/71            28 WSW  AERO 25 WSW  RMY 25
07/29  90/68/79/+7/0.00/698/80             23 SSW  AERO 25 SSW  RMY 24
07/30  88/71/80/+8/0.00/252/29             29 W    AERO 28 W    RMY 29
07/31  84/69/77/+5/0.00/564/65             14 ENE  AERO 14 ENE  RMY 15

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/…/..            36 WSW  AERO 38 SW   RMY 36
08/04  83/71/77/5/0.21/…/..              67 SSE  AERO 71 S    RMY 70
08/05  90/68/79/+7/0.00/…/..             28 SW   AERO 30 SW   RMY 29
08/06  84/65/75/3/0.00/…/..   20 W    AERO 17 W    RMY 19
08/07  79/65/72/0/T/…/..                 16 NE   AERO 16 NE   RMY N/A
08/08  83/64/74/+2/0.00/…/..             20 S    AERO 20 S    RMY 19
08/09  90/65/78/+6/0.00/…/..             26 SSW  AERO 26 SSW  RMY 26
08/10  94/69/82/+11/0.00/…/..            22 W    AERO 20 W    RMY 20

<08/11  The low since midnight is 72F, the daily normal low is 63F

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

RECORDS FOR AUGUST 11
HIGH 97F IN 1944
LOW 49F IN 1972
PRECIP 3.13 INCHES IN 1990
PEAK GUST 44 MPH SW IN 1971

RECORDS FOR AUGUST 12
HIGH 99F IN 1944
LOW 48F IN 1930
PRECIP 1.89 INCHES IN 1979
PEAK GUST 50 MPH NE IN 1983

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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