Thursday, August 31, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, AUGUST 31, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

TEMPS FALL, AFTERNOON SKIES MOSTLY CLOUDY DUE TO COLD FRONT

Cloud cover became broken with stratocumulus in the early
afternoon due to a passing cold front.  Temperatures rose
to 79F before falling to 73F at 1:00PM EST as the front
entered the region.  Winds out of the west and northwest
began gusting over 20 MPH, and a peak gust of 23 MPH was
recorded before noon.  Distant haze was present during
each observation which limited visibility to 40 miles.

Today’s Observations:

7 A.M.
Weather: Few altostratus WSW-N
Temperature: 59F; Dew Point: 51F; Wind: W at 10 kts
Sea-level pressure: 29.87 ins. Hg, rising unsteadily
Visibility: 40 miles, distant fog in all directions
6-hr Max temp: 59F
6-hr Min temp: 55F
24-hr Precip: Trace
BHO SA 1155 CLR 40 114/59/51/2610/987/ FEW AS WSW-N DSNT
FG ALQDS/ 8/010 52007 10059 20055

10 A.M.
Weather: Few altocumulus in all directions
Temperature: 75F; Dew Point: 54F; Wind: WNW at 8 kts
Sea-level pressure: 29.85 ins. Hg, rising then falling
Visibility: 40 miles, distant haze in all directions
BHO SA 1455 CLR 40 109/75/54/3008/985/ FEW AC ALQDS DSNT
HZ ALQDS/ 8/030 58005

1 P.M.
Weather: Broken stratocumulus, broken altocumulus
Temperature: 73F; Dew Point: 56F; Wind: WNW at 12G17 kts
Sea-level pressure: 29.84 ins. Hg, falling then rising
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 79F
6-hr Min temp: 59F
BHO SA 1755 E49 BKN 130 BKN 40 105/73/56/2912G17/984/ DSNT
HZ ALQDS/ 8/530 55004 10079 20059

SUMMARY FOR WEDNESDAY, AUGUST 30, 2017

TEMPERATURE (DEGREES F)
MAX…..72   NORMAL…..77
MIN…..57   NORMAL…..60
MEAN….65   NORMAL…..68

DEPARTURE FROM 30-YEAR NORMAL…………………….-3
TOTAL DEPARTURE FOR THE MONTH……………………+12 [+0.2 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….-4
TOTAL COOLING UNITS FOR THE MONTH………….184   DEPARTURE……….+2
TOTAL COOLING UNITS FOR THE SEASON…………605   DEPARTURE………+72
TOTAL COOLING UNITS LAST SEASON TO DATE…….784   DEPARTURE……..-179

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….22 NNE AT 10:58 A.M.
AERO……………………21 NNE AT 11:02 A.M.
ASOS……………………23 NE  AT 11:42 A.M.
DAVIS…………………..21 N   AT 10:58 A.M. RMY 23
FASTEST MILE FOR YESTERDAY…………………16 NNE AT 11:42 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………17 NE  AT 11:43 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..16 NNE AT 11:42 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.0 NNE
ASOS…………………..9.3
DAVIS………………….5.3 NNE [034 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…Trace  DEPARTURE……-0.11
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.60  DEPARTURE……-2.32
ASOS…………..1.58
TOTAL PRECIPITATION FOR THE YEAR……….36.36  DEPARTURE……+1.45
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 68/57/63/-6/…./…/..               18 ENE AERO 16 ENE RMY N/A
8/30 72/57/65/-3/…./…/..               22 NNE AERO 21 NNE RMY 23

8/31 Low temp since midnight is 55F; 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 31
HIGH 94F IN 1953
LOW 42F IN 1976
PRECIP 2.46 INCHES IN 1954
PEAK GUST 125 MPH SE IN 1954 [CAROL – RECORD FOR MONTH]

RECORDS FOR SEPTEMBER 1
HIGH 93F IN 1969, 2010
LOW 47F IN 1975
PRECIP 2.32 INCHES IN 2013
PEAK GUST 59e MPH S IN 1945, SSW IN 1965

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle