Tuesday, August 29, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, AUGUST 29, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST SKIES KEEPS TEMPS COOL TODAY

Clouds ahead of a low pressure system have been keeping
skies overcast all day with a mix of cumulus and alto-
stratus clouds.  Visibility was 10 miles during the 7:00AM
observation and only cleared to 40 miles by early afternoon.
The cloudy skies helped to prevent temperatures from reaching
higher than 70F by 1:00PM with a maximum of just 67F.  Winds
remain moderate and out of the northeast and east.

Today’s Observations:

7 A.M.
Weather: Few cumulus and cumulus fractus WNW-SSW, overcast altostratus,
patches of fog below summit, temperature inversion SE-N
Temperature: 59F; Dew Point: 57F; Wind: NE at 6 kts,
Wind speed: Light
Sea-level pressure: 30.32 ins. Hg, rising, then more quickly
Visibility: 10 miles, except 35 miles NE-SSE, distant fog in all directions
6-hr Max temp: 59F
6-hr Min temp: 57F
24-hr Precip: 0.00 in.
BHO SA 1155 E200 OVC 10 266/59/57/0506/032/ FEW CU/CUFRA WNW-SSW
VSBY 35 NE-SSE PTCHS FG BLO SMT DSNT FG ALQDS INVSN PRSNT SE-N WND LGT/
8/71/ 53007 10059 20057

10 A.M.
Weather: Broken cumulus, overcast altostratus, thin spot in overcast NNE
Temperature: 65F; Dew Point: 57F; Wind: ENE at 8G14 kts
Sea-level pressure: 30.29 ins. Hg, falling, then more quickly
Visibility: 30 miles, except 40 miles E-SSE, distant fog in all directions
BHO SA 1455 E17 BKN 200 OVC 30 258/65/57/0608G14/029/ THN SPTS IOVC NNE
VSBY 40 E-SSE DSNT FG ALQDS/ 8/11/ 58008

1 P.M.
Weather: Scattered cumulus, overcast altostratus
Temperature: 66F; Dew Point: 53F; Wind: E at 9 kts
Sea-level pressure: 30.25 ins. Hg, falling, then more slowly
Visibility: 40 miles, distant fog in all directions
6-hr Max temp: 67F
6-hr Min temp: 58F
BHO SA 1755 27 SCT E200 OVC 40 245/66/53/0909/025/ DSNT FG ALQDS/
8/11/ 56013 10067 20058

SUMMARY FOR MONDAY, AUGUST 28, 2017

TEMPERATURE (DEGREES F)
MAX…..74   NORMAL…..77
MIN…..56   NORMAL…..60
MEAN….65   NORMAL…..69

DEPARTURE FROM 30-YEAR NORMAL…………………….-4
TOTAL DEPARTURE FOR THE MONTH……………………+21 [+0.6 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….-5
TOTAL COOLING UNITS FOR THE MONTH………….184   DEPARTURE………+11
TOTAL COOLING UNITS FOR THE SEASON…………605   DEPARTURE………+81
TOTAL COOLING UNITS LAST SEASON TO DATE…….766   DEPARTURE……..-161

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….17 ENE AT 10:30 A.M.
AERO……………………16 ENE AT 11:39 A.M.*
ASOS……………………19 ENE AT  2:02 P.M.
DAVIS…………………..25 NNW AT  2:22 A.M. RMY 18
FASTEST MILE FOR YESTERDAY…………………12  N  AT  3:28 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………15 ENE AT  2:12 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..12 ENE AT  2:49 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..8.4 ENE
ASOS…………………..8.9
DAVIS………………….6.5 NE [050 DEG.] *last of multiple occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.11
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.44  DEPARTURE……-2.26
ASOS…………..1.43
TOTAL PRECIPITATION FOR THE YEAR……….36.20  DEPARTURE……+1.51
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/-1/0.00/831/98               18 S   AERO 18 S   RMY 19
8/10 86/63/75/+4/T/643/76                  20 S   AERO 18 S   RMY 20
8/11 82/63/73/+2/0.00/666/79               17 S   AERO 16 S   RMY 17
8/12 75/57/66/-5/0.17/294/35               22 SSW*AERO 22 SSW RMY 23
8/13 84/67/76/+5/0.00/796/95               26 WNW AERO 24 WNW RMY 26
8/14 82/67/75/+4/0.00/359/43               14 SSW*AERO 14 S   RMY 15
8/15 79/64/72/+1/T/058/07                  21 S   AERO 21 S   RMY 23
8/16 83/64/74/+3/0.00/698/84               23 NW* AERO 23 NW  RMY 25
8/17 81/58/70/-1/0.00/…/..               15 SSW AERO 14 SSW RMY N/A
8/18 79/63/71/0/0.01/…/..                33 S   AERO 35 S   RMY 35
8/19 89/65/77/+7/0.00/…/..               23 WSW AERO 23 WSW RMY 25
8/20 84/66/75/+5/0.00/…/..               23 NW  AERO 25 NW  RMY 27
8/21 85/63/74/+5/0.00/…/..               18 SW  AERO 20 SW  RMY 20
8/22 88/68/78/+8/0.00/…/..               31 S   AERO 35 S   RMY 34
8/23 83/64/74/+4/0.04/…/..               24 WNW*AERO 25 WNW RMY 27
8/24 80/59/70/0/0.00/…/..                18 WNW*AERO 17 WNW RMY 21
8/25 75/57/66/-3/T/…/..                  21 NW  AERO 21 NW  RMY 23
8/26 75/55/65/-4/0.00/…/..               16 WNW AERO 16 SSE RMY 17
8/27 75/55/65/-4/0.00/…/..               17 ENE*AERO 16 ENE*RMY 18
8/28 74/56/65/-4/0.00/…/..               17 ENE AERO 16 ENE*RMY 18

8/29 Low temp since midnight is 57F; normal low is now 60F

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 29
HIGH 95F IN 1953
LOW 41F IN 1982
PRECIP 2.88 INCHES IN 1962
PEAK GUST 70e MPH S IN 1949

RECORDS FOR AUGUST 30
HIGH 94F IN 1953
LOW 39F IN 1965
PRECIP 2.75 INCHES IN 1936
PEAK GUST 43 MPH NW IN 1965

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle