Saturday, August 19, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, AUGUST 19, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

FOGGY START TO DAY WITH CLEARING SKIES AND HOTTER
TEMPERATURES IN AFTERNOON

A storm yesterday that was expected to bring rain to the area mainly
stayed south of Great Blue Hill, but 0.01 in. of rain was measured.
This morning, the observatory was in very dense fog with only 1/16
of a mile of visibility. By the afternoon, the fog lifted leaving us
with scattered cumulus and scattered cirrus clouds and 70 miles of
visibility. However, distant haze limited the visibility to just
20 miles in the NNW-E. Temperatures had increased over 80F to a
maximum of 86F around 1:00 P.M. EST from a minimum of 65F this
morning. Dew points have stayed in the upper 60s making for humid
conditions. Winds have calmed down significantly since yesterday,
when we had a peak gust of 33 MPH out of the S at 11:04 A.M.

Today’s Observations:

7 A.M.
Weather: Sky obscurement due to fog
Temperature: 66F; Dew Point: 66F; Wind: W at 6 kts,
Wind Speed: Light
Sea-level pressure: 29.82 ins. Hg, rising, then less quickly
Visibility: 1/16 mile, fog
6-hr Max temp: 73F
6-hr Min temp: 65F
24-hr precip: 0.01 in.
BHO SA 1155 W2 X 1/16F 097/66/66/2606/982/ WND LGT/ 8//// 51014
MANUAL 60001 10073 20065

10 A.M.
Weather: Overcast stratus
Temperature: 72F; Dew Point: 69F; Wind: Estimated WNW at 3 kts,
Wind Speed: Light
Sea-level pressure: 29.84 ins. Hg, rising, then less quickly
Visibility: 10 miles, distant fog in all directions
BHO SA 1455 E5 OVC 10 106/72/69/E2903/984/ DSNT FG ALQDS WND LGT/
8/6// 50009

1 P.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 86F; Dew Point: 67F; Wind: SW at 5 kts,
Wind Speed: Light
Sea-level pressure: 29.81 ins. Hg, falling, then more quickly
Visibility: 70 miles, except 20 miles NNW-E, distant haze NNW-E
6-hr Max temp: 86F
6-hr Min temp: 66F
BHO SA 1755 32 SCT 250 SCT 70 095/86/67/2205/981/ VSBY NNW-E 20
DSNT HZ NNW-E WND LGT/ 8/101 58011 10086 20066

SUMMARY FOR FRIDAY, AUGUST 18, 2017

TEMPERATURE (DEGREES F)
MAX…..79   NORMAL…..79
MIN…..63   NORMAL…..62
MEAN….71   NORMAL…..71

DEPARTURE FROM 30-YEAR NORMAL……………………..0
TOTAL DEPARTURE FOR THE MONTH…………………….+9 [+0.3 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………6   DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH………….125   DEPARTURE……….+4
TOTAL COOLING UNITS FOR THE SEASON…………546   DEPARTURE………+74
TOTAL COOLING UNITS LAST SEASON TO DATE…….670   DEPARTURE……..-124

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….33 S   AT 11:04 A.M.
AERO……………………35 S   AT 10:59 A.M.
ASOS……………………34 SSW AT  1:18 P.M.
DAVIS…………………..37 SSW AT 11:03 A.M. RMY 35
FASTEST MILE FOR YESTERDAY…………………26 SSW AT  1:29 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………26 SSW AT  1:19 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..26 SSW AT  1:31 P.M.
AVERAGE WIND SPEED AND DIRECTION………….14.1 S
ASOS………………….14.0
DAVIS…………………11.7 S [185 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE……-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.40  DEPARTURE……-1.09
ASOS…………..1.38
TOTAL PRECIPITATION FOR THE YEAR……….36.16  DEPARTURE……+2.68
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 79/64/72/+1/T/…/..                  21 S   AERO 21 S   RMY 23
8/16 83/64/74/+3/0.00/…/..               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/…./…/..                33 S   AERO 35 S   RMY 35

8/19 Low temp since midnight is 65F; 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 19
HIGH 90F IN 1906, 1966, 2002
LOW 48F IN 1958
PRECIP 7.02 INCHES IN 1955 [DIANE – RECORD FOR MONTH] PEAK GUST 78 MPH ENE IN 1991 – HURRICANE BOB

RECORDS FOR AUGUST 20
HIGH 93F IN 1937
LOW 48F IN 1896, 1905, 1949
PRECIP 2.71 INCHES IN 1970
PEAK GUST 47 MPH W IN 1983

TODAY’S REPORT PREPARED BY: Lizzy Suzedell