Wednesday, July 12, 2017
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JULY 12, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME
MULTIPLE THUNDERSTORMS SPOTTED FROM BHO
The first thunderstorm began shortly before 10:00AM EST
and was south of the observatory. It quickly moved east
and dissipated. An additional storm began in the west
before noon and separated into a storm moving southeast
and a storm moving northeast. Thunder from these storms
is still ongoing at the time of this discussion. No rain
had been measured at the observatory by 1:00 PM.
Winds have been light and variable throughout the day.
Temperatures were warm and reached a max. of 85F by 1:00PM.
Dew points remained in the upper 60s and low 70s. The humid
conditions and light wind have kept visibility at 15 miles
or less.
Today’s Observations:
7 A.M.
Weather: Few cumulus SE-S, a layer of scattered altocumulus, a layer
of broken altocumulus, broken cirrus
Temperature: 73F; Dew Point: 69F; Wind: WSW at 6 kts,
Wind speed: Light
Sea-level pressure: 29.99 ins. Hg, rising then falling
Visibility: 10 miles, distant fog in all directions
6-hr Max temp: 73F
6-hr Min temp: 69F
24-hr precip: 0.05 inches
BHO SA 1155 120 SCT E200 BKN 250 BKN 10 157/73/69/2506/999/
FEW CU SE-S DSNT FG ALQDS WND LGT/ 8/191 50000 MANUAL 70005
ASOS 70006 10073 20069
10 A.M.
Weather: Thunderstorm to the south moving east, few cumulus N and SSW-SSW,
broken stratocumulus, overcast altostratus
Temperature: 81F; Dew Point: 69F; Wind: estimated S at 1 kt,
Wind: Light and variable
Sea-level pressure: 30.00 ins. Hg, rising then falling
Visibility: 20 miles, except 10 miles SE-S, distant fog in all directions
BHO SA 1455 E110 BKN 200 OVC 20 158/81/69/E1801/000/ FEW CU N AND SSE-SSW
VSBY SE-S 10 TSB30 S MOV E DSNT FG ALQDS WND L/V/ 8/151 51001
1 P.M.
Weather: Thunderstorms to the north and south moving east, cumulonimbus
N and S, scattered cumulus, scattered altocumulus, broken cirrus
Temperature: 85F; Dew Point: 73F; Wind: SE at 5 kts,
Wind speed: Light
Sea-level pressure: 29.96 ins. Hg, steady then falling
Visibility: 15 miles, except 10 miles S, distant fog in all directions
6-hr Max temp: 85F
6-hr Min temp: 73F
BHO SA 1755 59 SCT 110 SCT E200 BKN 15 146/85/73/1405/996/ CB N AND S
VSBY S 10 TS N AND S MOV E DSNT FG ALQDS WND LGT/ 8/391 58012 10085 20073
SUMMARY FOR TUESDAY, JULY 11, 2017
TEMPERATURE (DEGREES F)
MAX…..82 NORMAL…..81
MIN…..66 NORMAL…..63
MEAN….74 NORMAL…..72
DEPARTURE FROM 30-YEAR NORMAL…………………….+2
TOTAL DEPARTURE FOR THE MONTH……………………+21 [+1.7 DEGREES/DAY]
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………9 DEPARTURE……….+2
TOTAL COOLING UNITS FOR THE MONTH…………..89 DEPARTURE………+18
TOTAL COOLING UNITS FOR THE SEASON…………290 DEPARTURE………+90
TOTAL COOLING UNITS LAST SEASON TO DATE…….215 DEPARTURE………+75
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….24 S AT 1:03 A.M.
AERO……………………24 S AT 12:28 A.M.
ASOS……………………26 S AT 1:03 A.M.
DAVIS…………………..24 SSW AT 12:13 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………18 S AT 12:14 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………18 S AT 12:39 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..17 S AT 12:16 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.6 S
ASOS…………………..9.7
DAVIS………………….8.1 SW [219 DEG.]
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.05 DEPARTURE……-0.08
ASOS…………..0.06
TOTAL PRECIPITATION FOR THE MONTH……….1.03 DEPARTURE……-0.22
ASOS…………..1.02
TOTAL PRECIPITATION FOR THE YEAR……….32.40 DEPARTURE……+4.18
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 84/61/73/+1/0.15/…/.. 30 SW* AERO 32 SSW RMY 33
7/9 81/60/71/-1/0.00/…/.. 26 W AERO 26 W RMY 26
7/10 85/63/74/+2/T/…/.. 25 SW AERO 25 S RMY 26
7/11 82/66/74/+2/0.25/…/.. 24 S AERO 24 S RMY N/A
7/12 Low temp since midnight is 69F; 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 12
HIGH 97F IN 1943
LOW 48F IN 1945
PRECIP 1.43 INS IN 1975
WIND 48e MPH SSW IN 1944
RECORDS FOR JULY 13
HIGH 95F IN 1894
LOW 52F IN 1888, 1895, 1939, 1973
PRECIP 3.54 INS IN 1996
WIND 55 MPH SE IN 1996
TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle
