Friday, August 23, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, AUGUST 23, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

A FAIR WEATHER DAY WITH EXCELLENT
VISIBILITY ATOP GREAT BLUE HILL….

Visibility was very good after the fog dissipated
this morning, with an average of 85 miles being
seen. A light rain earlier on in the day left
0.04 inches in the gauge by 7 A.M.; and ended
shortly after. Conditions were cool and dry,
with the relative humidity dropping to a little
over 40% by noontime. The high so far today
is 77F, a degree below the daily normal maximum
of 78F. The low since midnight is 61F, the same as
the average daily minimum.

Today’s Observations:

7 A.M.
Weather: Light rain and overcast nimbostratus
Temperature: 62F; Dew Point: 61F; Wind: S at 6 kts,
Wind: Light
Sea-level pressure: 29.97 ins. Hg, rising, then more rapidly
Visibility: 40 miles, distant fog
6-hr Max temp: 69F
6-hr Min temp: 61F
24-hr Precip: 0.04 ins.
BHO SA 1155 E110 OVC 40R- 149/62/61/3106/997/ DSNT FG
ALQDS R-CTD WND LGT/ 8/02/ 51017 10069 20061

10 A.M.
Weather: Overcast altocumulus with a few cumulus
Temperature: 68F; Dew Point: 62F; Wind: WNW at 5 kts,
Wind: Light
Sea-level pressure: 29.99 ins. Hg, falling then rising
Visibility: 85 miles
3-hr Precip: Trace
BHO SA 1455 E110 OVC 85 155/68/62/2905/999/ FEW CU
ALQDS WND LGT/ 8/17/ 600// 50006

1 P.M.
Weather: Broken altocumulus with a few cumulus
Temperature: 77F; Dew Point: 56F; Wind: WNW at 6 kts,
Wind: Light
Sea-level pressure: 29.96 ins. Hg, falling steadily
Visibility: 80 miles
6-hr Max temp: 77F
6-hr Min temp: 62F
6-hr Precip: Trace
BHO SA 1755 E130 BKN 80 148/77/56/3006/996/ FEW CU
ALQDS WND LGT/ 8/170 600// 56007 10077 20062

SUMMARY FOR THURSDAY, AUGUST 22, 2019

TEMPERATURE (DEGREES F)
MAX…..88   NORMAL…..79
MIN…..68   NORMAL…..61
MEAN….78   NORMAL…..70

DEPARTURE FROM 30-YEAR NORMAL………………….+8
TOTAL DEPARTURE FOR THE MONTH…………………+45 [+1.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..13   DEPARTURE………+7
TOTAL COOLING UNITS FOR THE MONTH………….182   DEPARTURE……..+38
TOTAL COOLING UNITS FOR THE SEASON…………593   DEPARTURE……..+98
TOTAL COOLING UNITS LAST SEASON TO DATE…….670   DEPARTURE……..-77

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 W   AT  3:36 P.M.
AERO…………………….21 W   AT  3:36 P.M.
ASOS…………………….25 W   AT  3:37 P.M.
DAVIS……………………26 W   AT  3:35 P.M. RMY 26
FASTEST MILE FOR YESTERDAY………………….17 W   AT  2:24 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 W   AT  3:38 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………19 W   AT  3:37 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.2 SW
ASOS…………………..9.9
DAVIS………………….9.5 WSW [252 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.04  DEPARTURE……-0.08
ASOS…………..0.02
TOTAL PRECIPITATION FOR THE MONTH……….1.02  DEPARTURE……-1.91
ASOS…………..0.96
TOTAL PRECIPITATION FOR THE YEAR……….36.34  DEPARTURE……+2.34
ASOS………….36.24

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  85/68/77/+7/0.12/…/..               33 SW  AERO 32 SW  RMY 33
8/22  88/68/78/+8/0.00/…/..               25 W   AERO 21 W   RMY 26

8/23 Low temp since midnight is 61F; normal low is 62F

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

RECORDS FOR AUGUST 23
HIGH 88F IN 1918, 1947, 1949, 1996
LOW 45F IN 1923
PRECIP 2.09 INCHES IN 2010
PEAK GUST 60e MPH NW IN 1940

RECORDS FOR AUGUST 24
HIGH 92F IN 1947
LOW 43F IN 1971
PRECIP 2.40 INCHES IN 2010
PEAK GUST 54 MPH W IN 1986

TODAY’S REPORT PREPARED BY: Benjamin Turner