Wednesday, August 21, 2019

| August 21, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, AUGUST 21, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

LIMITED VISIBILITY WITH BUILDING CUMULUS
IN THE AFTERNOON….

Visibility was limited throughout the day,
with 35 miles on average due to a distant haze.
Conditions were increasingly cloudy, with some
cumulonimbus clouds being seen during the 1 P.M.
observation. A couple rumbles of thunder were
heard to the southwest. Wind has been southerly,
with speeds up to 26 mph. The high so far today
is 85F, 6 degrees above the daily normal maximum
of 79F. The low since midnight is 67F, 6 degrees
above the average daily minimum of 61F.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, broken cirrus
Temperature: 74F; Dew Point: 70F; Wind: S at 9 kts
Sea-level pressure: 30.03 ins. Hg, rising then falling
Visibility: 30 miles, hazy
6-hr Max temp: 74F
6-hr Min temp: 67F
24-hr Precip: 0.00 ins.
BHO SA 1155 110 SCT E250 BKN 30 169/74/70/1909/003/
HAZY/ 8/078 55001 10074 20067

10 A.M.
Weather: Broken altocumulus, overcast cirrostratus
Temperature: 79F; Dew Point: 71F; Wind: S at 8 kts
Sea-level pressure: 29.98 ins. Hg, falling, then more rapidly
Visibility: 35 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 E110 BKN 250 OVC 35 154/79/71/1708/998/
HAZY/ 8/078 58015

1 P.M.
Weather: Scattered cumulus with cumulonimbus to the SW,
Overcast cirrostratus
Temperature: 82F; Dew Point: 71F; Wind: S at 1913G19 kts
Sea-level pressure: 29.92 ins. Hg, falling steadily
Visibility: 35 miles, hazy
6-hr Max temp: 85F
6-hr Min temp: 74F
6-hr Precip: 0.00 ins.
BHO SA 1755 40 SCT E230 OVC 35 135/82/71/1913G19/992/
DSNT CB SW HAZY/ 8/208 58019 10085 20074

SUMMARY FOR TUESDAY, AUGUST 20, 2019

TEMPERATURE (DEGREES F)
MAX…..87   NORMAL…..79
MIN…..66   NORMAL…..62
MEAN….77   NORMAL…..70

DEPARTURE FROM 30-YEAR NORMAL………………….+7
TOTAL DEPARTURE FOR THE MONTH…………………+30 [+1.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..12   DEPARTURE………+7
TOTAL COOLING UNITS FOR THE MONTH………….157   DEPARTURE……..+24
TOTAL COOLING UNITS FOR THE SEASON…………568   DEPARTURE……..+84
TOTAL COOLING UNITS LAST SEASON TO DATE…….663   DEPARTURE……..-95

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..18 W   AT  3:10 P.M.
AERO…………………….14 SSW AT 11:06 P.M.
ASOS…………………….17 SW  AT  3:10 P.M.
DAVIS……………………16 W   AT 12:04 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………….12 SSW AT 11:06 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….12 SSW AT 11:10 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………13 W   AT 12:02 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..6.8 W
ASOS…………………..7.3
DAVIS………………….7.2 W [266 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.86  DEPARTURE……-1.90
ASOS…………..0.85
TOTAL PRECIPITATION FOR THE YEAR……….36.18  DEPARTURE……+2.43
ASOS………….36.13

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

8/01  84/66/75/+3/0.00/755/87               18 NNW AERO 20 NW  RMY 17
8/02  83/61/72/0/0.00/804/93                18 WSW AERO 18 WSW RMY 18
8/03  84/66/75/+3/0.00/302/35               25 SW  AERO 26 SW  RMY 25
8/04  83/66/75/+3/0.00/732/85               21 NE  AERO 23 SW  RMY 25
8/05  81/58/70/-2/0.00/842/98               20 S   AERO 18 S   RMY 19
8/06  79/63/71/-1/0.00/282/33               15 S   AERO 14 S   RMY 17
8/07  82/66/74/+2/…./367/43               32 SSW AERO 35 SSW RMY 35
8/08  84/67/76/+4/…./588/69               30 SW  AERO 24 WNW RMY 29
8/09  82/63/73/+1/…./815/96               28 NW  AERO 25 NW  RMY 26
8/10  78/59/69/-2/…./669/79               32 NW  AERO 28 NW  RMY 28
8/11  78/55/67/-4/0.00/…/..               28 W   AERO 25 W   RMY 28
8/12  82/60/71/0/0.00/…/..                25 W   AERO 23 W   RMY 26
8/13  77/66/72/+1/0.02/…/..               25 W   AERO 24 WSW RMY 24
8/14  75/62/69/-2/…./…/..               24 ENE AERO 22 ENE RMY 22
8/15  77/59/68/-3/…./…/..               17 ESE AERO 15 SSE RMY 16
8/16  78/61/70/-1/…./../..                20 E   AERO 17 ESE RMY 18
8/17  78/67/73/+2/…./../..                14 SE  AERO 15 SE  RMY 15
8/18  88/70/79/+8/…./…/..               18 SSW AERO 18 SSW RMY 21
8/19  92/69/81/+11/…./…/..              25 WSW AERO 23 WSW RMY 25
8/20  87/66/77/+7/…./…/..               18 W   AERO 14 WSW RMY N/A

8/21 Low temp since midnight is 67F; normal low is 62F

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

RECORDS FOR AUGUST 21
HIGH 92F IN 1937, 1995
LOW 47F IN 1982
PRECIP 2.84 INCHES IN 1888
PEAK GUST 54 MPH WSW IN 2004

RECORDS FOR AUGUST 22
HIGH 90F IN 1939
LOW 42F IN 1894
PRECIP 2.28 INCHES IN 1935
PEAK GUST 44 MPH SSW IN 1987

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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