Tuesday, August 15, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, AUGUST 15, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

BRIEF RAIN SHOWER IN THE MORNING, OVERCAST SKIES ALL DAY

Low clouds have kept skies mostly cloudy and overcast all
day.  A very light rain shower occurred for a few minutes
around 5:30AM EST, but no other precip. has been observed
since then.  The cloudy skies have helped to keep temps.
slightly lower than expected.  Temperatures rose to 79F
before 1:00PM and seemed to be on a downward trend for the
rest of the afternoon.  Distant fog and haze have limited
visibility to 15-30 miles.

Today’s Observations:

7 A.M.
Weather: Broken altocumulus, overcast cirrostratus
Temperature: 68F; Dew Point: 65F; Wind: SW at 6 kts,
Wind speed: Light
Sea-level pressure: 29.96 ins. Hg, falling then rising
Visibility: 15 miles, except 30 miles NE-E and 20 miles ENE-S,
distant fog ENE-NNE
6-hr Max temp: 68F
6-hr Min temp: 66F
24-hr precip: Trace
BHO SA 1155 E85 BKN 220 OVC 15 147/68/65/2206/996/ VSBY NE-E 30
VSBY ENE-S 20 DSNT FG ENE-NNE WND LGT/ 8/037 55000 10068 20066

10 A.M.
Weather: Scattered cumulus, broken altocumulus, broken cirrus
Temperature: 75F; Dew Point: 65F; Wind: SSW at 7 kts
Sea-level pressure: 29.95 ins. Hg, steady then falling
Visibility: 30 miles, except 20 miles WSW-NW,
distant haze in all directions
BHO SA 1455 54 SCT E69 BKN 300 BKN 30 143/75/65/2007/995/
VSBY WSW-NW 20 DSNT HZ ALQDS/ 8/131 58004

1 P.M.
Weather: Few cumulus in all directions, scattered stratocumulus,
overcast stratus
Temperature: 76F; Dew Point: 63F; Wind: SSW at 5 kts,
Wind Speed: Light
Sea-level pressure: 29.92 ins. Hg, falling, then more slowly
Visibility: 30 miles, except 20 miles WNW-NW,
distant haze in all directions
6-hr Max temp: 79F
6-hr Min temp: 68F
BHO SA 1755 34 SCT E49 OVC 30 133/76/63/2005/992/ FEW CU ALQDS
VSBY WNW-NW 20 DSNT HZ ALQDS WND LGT/ 8/6// 56010 10079 20068

SUMMARY FOR MONDAY, AUGUST 14, 2017

TEMPERATURE (DEGREES F)
MAX…..82   NORMAL…..80
MIN…..67   NORMAL…..62
MEAN….75   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL…………………….+4
TOTAL DEPARTURE FOR THE MONTH…………………….+5 [+0.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..10   DEPARTURE……….+4
TOTAL COOLING UNITS FOR THE MONTH…………..98   DEPARTURE……….+1
TOTAL COOLING UNITS FOR THE SEASON…………519   DEPARTURE………+71
TOTAL COOLING UNITS LAST SEASON TO DATE…….622   DEPARTURE……..-103

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….14 SSW AT 2:53 P.M.*
AERO……………………14  S  AT 3:52 P.M.
ASOS……………………15 SSW AT 2:53 P.M.
DAVIS…………………..15  S  AT 2:53 P.M. RMY 15
FASTEST MILE FOR YESTERDAY………………….9 SSW AT 4:22 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………12 SSW AT 4:00 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..11 SSW AT 3:59 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..6.0  S
ASOS…………………..6.4
DAVIS………………….4.8  S [174 DEG.] *last of multiple occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…Trace  DEPARTURE……-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.39  DEPARTURE……-0.58
ASOS…………..1.38
TOTAL PRECIPITATION FOR THE YEAR……….36.15  DEPARTURE……+3.19
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

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

8/1  87/65/76/+4/0.00/762/88               16 ESE*AERO 16 NNW RMY 16
8/2  86/65/76/+4/1.09/372/43               32 W   AERO 36 W   RMY 34 TSTM
8/3  83/65/74/+2/0.00/552/64               22 S   AERO 23 S   RMY 24
8/4  84/66/75/+3/0.00/697/81               26 S   AERO 30 S   RMY 29
8/5  75/63/69/-3/0.10/060/07               23 NW  AERO 28 NW  RMY 29
8/6  76/57/67/-5/0.00/795/93               30 NW  AERO 32 NW  RMY 31
8/7  76/60/68/-4/0.01/597/70               28 SSW AERO 28 SSW RMY 29
8/8  74/60/67/-5/0.02/000/00               17 S   AERO 16 SSE RMY 16
8/9  83/58/71/-1/0.00/…/..               18 S   AERO 18 S   RMY 19
8/10 86/63/75/+4/T/…/..                  20 S   AERO 18 S   RMY 20
8/11 82/63/73/+2/0.00/…/..               17 S   AERO 16 S   RMY 17
8/12 75/57/66/-5/0.17/…/..               22 SSW*AERO 22 SSW RMY 23
8/13 84/67/76/+5/0.00/…/..               26 WNW AERO 24 WNW RMY 26
8/14 82/67/75/+4/0.00/…/..               14 SSW*AERO 14 S   RMY 15

8/15  Low temp since midnight is 66F; normal low is now 62F

DAILY RECORDS FOR AUGUST

None so far.

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

RECORDS FOR AUGUST 15
HIGH 95F IN 1928
LOW 47F IN 1964
PRECIP 1.89 INCHES IN 2011
PEAK GUST 44e MPH S IN 1941

RECORDS FOR AUGUST 16
HIGH 95F IN 1944
LOW 50F IN 1927
PRECIP 1.47 INCHES IN 1926
PEAK GUST 45e MPH N IN 1951

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle