Saturday, July 8, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JULY 8, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
PARTLY SUNNY WITH INCREASING HUMIDITY THIS MORNING…
CLOUDS ADVANCING THIS AFTERNOON WITH THUNDERSTORMS
BUILDING IN THE AREA…
Rainfall Friday morning and early afternoon brought a
total of 0.63 inches of rain, the first precipitation
of the month. An early overcast of stratocumulus today
moved off by mid-morning leaving a partly sunny sky.
The dew point climbed to the upper 60s by 10 AM EST,
and the temperature climbed to the low 80s by early
afternoon. At the 1 PM EST observation, moderate and
towering cumulus were approaching from the WNW-NW,
though the associated thunderstorms passed well to
the NW-N of the summit from 1-2:30 PM EST. After the
passage of the thunderstorms, the visibility to the
northwest climbed to 75 miles, though the dew point
remained in the middle 60s.
Today’s Observations:
7 A.M.
Weather: Scattered stratus fractus, overcast stratocumulus
thin spots in overcast, sun occasionally dimly visible, hazy
Temperature: 66F; Dew Point: 65F; Wind: SSW at 10 kts,
Sea-level pressure: 29.76 ins. Hg, rising then more quickly
Visibility: 20 miles, visibility north 10
6-hr Max temp: 66F
6-hr Min temp: 61F
24-hr precip: 0.63 inches
BHO SA 1155 5 SCT E7 OVC 20 079/66/65/2110/976/ FEW THN
SPTS IOVC SUN OCNLY DMLY VSBL VSBY N 10/ 8/5// 53011 70063
10066 20061
10 A.M.
Weather: Scattered stratocumulus, scattered altocumulus, hazy
Temperature: 76F; Dew Point: 68F; Wind: S at 7 kts
Sea-level pressure: 29.77 ins. Hg, rising slightly
Visibility: 30 miles
3-hour precip: 0.00 inches
BHO SA 1455 12 SCT 120 SCT 30 081/76/68/1907/977/ HAZY/
8/530 51002
1 P.M.
Weather: Scattered cumulus, thin broken cirrus, few moderate
cumulus WNW-NE, towering cumulus distant WNW-NW moving east,
hazy
Temperature: 82F; Dew Point: 67F; Wind: SSW at 15G20 kts
Sea-level pressure: 29.71 ins. Hg, falling, then more quickly
Visibility: 30 miles
6-hr Max temp: 82F
6-hr Min temp: 66F
6-hr precip: 0.00 inches
BHO SA 1755 35 SCT 250 -BKN 30 060/82/67/2015G20/971/ FEW
MDT CU WNW-NE TCU DSNT WNW-NW MVNG E HAZY/ 8/201 58021 10082 20066
SUMMARY FOR FRIDAY, JULY 7, 2017
TEMPERATURE (DEGREES F)
MAX…..71 NORMAL…..80
MIN…..60 NORMAL…..62
MEAN….66 NORMAL…..71
DEPARTURE FROM 30-YEAR NORMAL…………………….-5
TOTAL DEPARTURE FOR THE MONTH……………………+17 [+2.2 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………1 DEPARTURE……….-6
TOTAL COOLING UNITS FOR THE MONTH…………..57 DEPARTURE………+13
TOTAL COOLING UNITS FOR THE SEASON…………258 DEPARTURE………+85
TOTAL COOLING UNITS LAST SEASON TO DATE…….213 DEPARTURE………+45
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….28 ENE AT 3:36 P.M.
AERO……………………28 ENE AT 3:36 P.M.
ASOS……………………30 ENE AT 3:36 P.M.
DAVIS…………………..27 ENE AT 3:31 P.M. RMY 27
FASTEST MILE FOR YESTERDAY…………………22 ENE AT 3:31 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………22 ENE AT 3:32 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..19 ENE AT 3:32 P.M.
AVERAGE WIND SPEED AND DIRECTION………….10.0 NE
ASOS…………………..9.5
DAVIS………………….8.2 NNE [030 DEG.]
*last of multiple occurrences
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.63 DEPARTURE……+0.52
ASOS…………..0.62
TOTAL PRECIPITATION FOR THE MONTH……….0.63 DEPARTURE……-0.13
ASOS…………..0.62
TOTAL PRECIPITATION FOR THE YEAR……….31.37 DEPARTURE……+4.27
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings
PRELIMINARY CLIMATE SUMMARY FOR JULY 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
7/1 85/67/76/+6/T/439/48 35 S AERO 37 S RMY 38
7/2 87/69/78/+8/T/785/86 25 W* AERO 28 W* RMY 27
7/3 85/67/76/+5/0.00/894/98 28 W* AERO 29 W RMY 30
7/4 84/62/73/+2/0.00/783/86 17 W AERO 17 W RMY 18
7/5 82/62/72/+1/0.00/855/94 20 S AERO 20 ENE RMY 20
7/6 82/60/71/+6/0.00/664/73 21 SSW AERO 22 SSW RMY 21
7/7 71/60/66/-5/0.63/000/00 28 ENE AERO 28 ENE RMY 27
7/8 Low temp since midnight is 61F; normal low is now 63F
DAILY RECORDS FOR JULY
None so far.
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR JULY 8
HIGH 95F IN 1981
LOW 50F IN 1919
PRECIP 1.74 INS IN 1916
PEAK GUST 46e SSW IN 1941
RECORDS FOR JULY 9
HIGH 98F IN 1912
LOW 47F IN 1909
PRECIP 3.74 INS IN 1921
WIND 46 MPH NW IN 1992
TODAY’S REPORT PREPARED BY: Mike Iacono and Doug Gifford
