Friday, August 25, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, AUGUST 25, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

PASSING COLD FRONT BRINGS MORNING RAIN, COOLER TEMPS

A passing cold front made morning skies mostly cloudy, and
a trace of precip. was measured between 8:00AM and 9:00AM EST
due to light rain.  Light fog was observed during the rain
but quickly cleared to maintain a day of 70 miles of visibility.

High pressure and dry air helped to keep skies mostly sunny in
the late morning once the front passed. Diurnal cumulus formed
in the afternoon and became a broken cloud layer by the 1:00PM
observation.  The cold front has also brought cooler temps.
The overnight low measured 57F and the max. by 1:00PM was 75F.

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus, broken altocumulus
Temperature: 61F; Dew Point: 53F; Wind: NNW at 8 kts
Sea-level pressure: 30.06 ins. Hg, rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 61F
6-hr Min temp: 57F
24-hr Precip: 0.00 in.
BHO SA 1155 64 SCT E110 BKN 70 180/61/53/3308/006/ 8/590 51016
10061 20057

10 A.M.
Weather: Few cumulus all directions, altocumulus all directions
Temperature: 69F; Dew Point: 52F; Wind: NW at 5 kts,
Wind speed: Light
Sea-level pressure: 30.08 ins. Hg, rising then falling
Visibility: 70 miles
3-hr Precip: Trace
BHO SA 1455 CLR 70 187/69/52/3205/008/ FEW CU ALQDS FEW AC
ALQDS WND LGT/ 8/130 50007 MANUAL 600// ASOS 60001

1 P.M.
Weather: Broken cumulus
Temperature: 75F; Dew Point: 49F; Wind: WNW at 8 kts
Sea-level pressure: 30.08 ins. Hg, falling then steady
Visibility: 70 miles
6-hr Max temp: 75F
6-hr Min temp: 61F
6-hr Precip: Trace
BHO SA 1755 E60 BKN 70 185/75/49/3008/008/ 8/100 55002
MANUAL 600// ASOS 60001 10075 20061

SUMMARY FOR THURSDAY, AUGUST 24, 2017

TEMPERATURE (DEGREES F)
MAX…..80   NORMAL…..78
MIN…..59   NORMAL…..61
MEAN….70   NORMAL…..70

DEPARTURE FROM 30-YEAR NORMAL……………………..0
TOTAL DEPARTURE FOR THE MONTH……………………+36 [+1.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………5   DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH………….183   DEPARTURE………+29
TOTAL COOLING UNITS FOR THE SEASON…………604   DEPARTURE………+99
TOTAL COOLING UNITS LAST SEASON TO DATE…….719   DEPARTURE……..-115

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….18 WNW AT 12:23 P.M.*
AERO……………………17 WNW AT 11:58 A.M.
ASOS……………………21 NW  AT 12:03 P.M.
DAVIS…………………..19 W   AT 11:52 A.M. RMY 21
FASTEST MILE FOR YESTERDAY…………………15 WNW AT 12:00 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………15 WNW AT 12:24 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..14 WNW AT 12:24 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..7.8 WNW
ASOS…………………..8.0
DAVIS………………….6.6 WNW [299 DEG.] *last of multiple occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.44  DEPARTURE……-1.81
ASOS…………..1.42
TOTAL PRECIPITATION FOR THE YEAR……….36.20  DEPARTURE……+1.96
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 Low temp since midnight is 57F; normal low is now 61F

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 25
HIGH 93F IN 1947, 1948, 2007
LOW 41F IN 1940
PRECIP 2.69 INCHES IN 2010
PEAK GUST 60e MPH SSW IN 1941

RECORDS FOR AUGUST 26
HIGH 96F IN 1900, 1948
LOW 46F IN 1885
PRECIP 5.85 INCHES IN 1924
PEAK GUST 55e MPH NNW IN 1947

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle