Saturday, August 27, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, AUGUST 27, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

ANOTHER DAY OF HEAT AND HIGH HUMIDITY YESTERDAY
BRIEF EARLY AFTERNOON DOWNPOUR YIELDS 0.25 IN.
ABOVE NORMAL WARMTH CONTINUES TODAY WITH MUCH LOWER HUMIDITY

Yesterday was yet another day this hot month of August with
high temperatures in the high 80’s (88F) and dew points rising
to the low 70’s.  The brief early afternoon downpour did little
to ease the ongoing extreme drought with 0.25 in about 15 minutes.

Overnight into this morning the air mass has changed with the
significant lowering of the humidity with dew points falling to near
60 degrees and then into the 50’s later this morning.

The above normal temperatures continue today with our morning low
of 66 degrees running 6 degrees above the normal. Only 5 days have
had cooler than normal temperatures this month.

7 A.M.
Weather: Thin broken cirrus
Temperature: 70F; Dew Point: 60F; Wind: NNW at 7 kts
Sea-level pressure: 30.18 ins. Hg, rising, then falling
Visibility: 50 miles, light distant haze
6-hr Max temp: 71F
6-hr Min temp: 66F
24-hr precip: 0.25 in.
BHO SA 1155 300 -BKN 50 221/70/60/3407/018/ LGT DSNT HZ/ 8/001 51022
MANUAL 70025 ASOS 70024 10071 20066

10 A.M.
Weather: Clear, cumulus forming distant NW, ci SSE
Temperature: 82F; Dew Point: 57F; Wind: ENE at 6 kts,
Wind: Light and variable
Sea-level pressure: 30.21 ins. Hg, rising then falling slightly
Visibility: 55 miles, NE-SE 30 miles,  hazy
BHO SA 1455 CLR 55 229/82/57/0706/021/ CU FRMG DSNT NW FEW CI SSE
VSBY NE-SE 30 LGT DSNT HZ WND L/V/ 8/101 50008

1 P.M.
Weather: Scattered cumulus, stratocumulus formed by spreading out
of the cumulus
Temperature: 85F; Dew Point: 57F; Wind: ENE at 5 kts,
Wind: Light
Sea-level pressure: 30.19 ins. Hg,
Visibility: 50 miles, distant haze
6-hr Max temp: 85F
6-hr Min temp: 70F
BHO SA 1755 60 SCT 50 223/85/57/0605/019/ CU/SCCU S-W-N CLR SKY NE-SE
LGT DSNT HZ/ 8/400 56006 10085 20070

SUMMARY FOR FRIDAY, AUGUST 26, 2016

TEMPERATURE (DEGREES F)
MAX…..88   NORMAL…..78
MIN…..70   NORMAL…..61
MEAN….79   NORMAL…..69

DEPARTURE FROM 30-YEAR NORMAL…………………..+10
TOTAL DEPARTURE FOR THE MONTH………………….+115 [+4.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..14   DEPARTURE……….+9
TOTAL COOLING UNITS FOR THE MONTH………….270   DEPARTURE……..+106
TOTAL COOLING UNITS FOR THE SEASON…………744   DEPARTURE……..+229
TOTAL COOLING UNITS LAST SEASON TO DATE…….628   DIFFERENCE…….+116

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 W   AT   1:17 P.M.
AEROVANE………………..17 W   AT   1:18 P.M.
ASOS……………………22 W   AT   1:18 P.M.
DAVIS…………………..21 SSW AT   8:46 A.M. RMY 21
FASTEST MILE FOR YESTERDAY…………………N/A
MAXIMUM 2-MINUTE ASOS AVERAGE………………16 W   AT   1:19 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16 SSW AT   8:52 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.5
ASOS………………….10.0
DAVIS………………… 8.7 WSW [240 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.25  DEPARTURE……+0.13
ASOS…………..0.24
TOTAL PRECIPITATION FOR THE MONTH……….1.78  DEPARTURE……-1.70
ASOS…………..1.76
TOTAL PRECIPITATION FOR THE YEAR……….24.97  DEPARTURE……-9.50
ASOS………….25.27

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

8/1  75/65/70/-2/0.02/320/37                 21 NE  AERO 20 ENE RMY 20
8/2  71/63/67/-5/0.12/000/00                 16 ENE AERO 16 ENE RMY 16
8/3  81/60/71/-1/0.00/603/70                 18 S   AERO 16 S   RMY 17
8/4  86/61/74/+2/0.00/833/97                 23 S   AERO 22 S   RMY 17
8/5  87/61/74/+2/0.00/823/96                 29 S   AERO 29 S   RMY 30
8/6  88/67/78/+6/T/419/49                    24 SSW AERO 23 SSW RMY 23
8/7  89/65/77/+5/0.00/784/92                 26 WNW AERO 25 WNW RMY 26
8/8  87/63/75/+3/0.00/816/96                 23 W   AERO 21 W   RMY 22
8/9  90/65/78/+6/0.00/789/93                 25 SSW AERO 24 SSW RMY 25
8/10 76/66/71/+0/0.28/017/02                 30 SSW AERO 31 SSW RMY 33
8/11 93/73/83/+12/T/666/79                   22 SSW AERO 21 SSW RMY 22
8/12 95/74/85/+14/0.00/487/58                30 SW  AERO 30 SW  RMY 31
8/13 77/67/72/+1/0.16/201/24                 25 NNW AERO 36 NNW RMY N/A TSTM
8/14 94/69/82/+11/0.39/701/84                39 SSW AERO 40 SSW RMY N/A TSTM
8/15 89/68/79/+8/0.00/758/91                 25 W   AERO 24 W   RMY 28
8/16 83/69/76/+5/0.02/125/15                 31 S   AERO 30 S   RMY N/A
8/17 84/68/76/+5/0.00/679/82                 38 W*  AERO 35 W   RMY 39
8/18 89/65/77/+6/T/635/77                    22 SW  AERO 20 SW  RMY 21
8/19 86/68/77/+7/0.00/674/82                 17 S   AERO 16 SSE RMY 17
8/20 86/65/76/+6/0.00/754/92                 25 S   AERO 23 S   RMY 25
8/21 87/63/75/+5/0.54/727/89                 25 S   AERO 22 SSE RMY N/A
8/22 78/59/69/-1/0.00/…/..                 31 NW  AERO 29 NW  RMY 32
8/23 80/54/67/-3/0.00/…/..                 23 WSW AERO 21 WSW RMY 23
8/24 87/62/75/+5/0.00/…/..                 22 W   AERO 18 W   RMY 20
8/25 86/65/76/+7/0.00/…/..                 28 SW  AERO 23 SW  RMY 27
8/26 88/70/79/+9/0.25/…/..                 23 W   AER0 17 W   RMY 21

Low temp since midnight is 66F; normal low is now 60F

DAILY RECORDS FOR AUGUST 2016
8/11/16: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 73F,
TIES PREVIOUS RECORD SET IN 1900 AND 1988

8/12/16: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 74F,
TIES PREVIOUS RECORD SET IN 1988

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

RECORDS FOR AUGUST 27
HIGH 99F IN 1948
LOW 44F IN 1885
PRECIP 2.77 INCHES IN 1946
PEAK GUST 48 MPH NW IN 1983

TODAY’S REPORT PREPARED BY: Robert Skilling