Saturday, June 18, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, JUNE 18, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

VERY SUNNY AND SEASONABLE

After a sunny day on Friday and thunderstorm formed to the
NE of the Observatory during the late evening. This brought
only traces of precipitation as it passed east of the summit
moving toward the south during the 10-11 PM EST hour. A
temporary wind shift from the SSW to the NNE was observed
as the storm approached with two wind gusts of 23 mph
occurring during that hour. Since midnight, the wind direction
has veered from SSW to ENE as of early afternoon.

The sky was completely free of clouds during the first two
observations this morning with only small cumulus forming
inland later in the day. Visibility remained near 70-75
miles with a dew point in the upper 40s to low 50s all day.

Today’s Observations:

7 A.M.
Weather: Sky clear (no clouds)
Temperature: 64F; Dew Point: 51F; Wind: N at 10 kts,
Sea-level pressure: 30.16 in. Hg, rising steadily
Visibility: 75 miles
6-hr Max temp: 64F
6-hr Min temp: 55F
24-hr precip: Trace
BHO SA 1155 CLR 75 214/64/51/3510/016/ SKC/ 52021 10064 20055

10 A.M.
Weather: Sky clear (no clouds)
Temperature: 73F; Dew Point: 49F; Wind: NE at 10 kts
Sea-level pressure: 30.23 in. Hg, rising, then more slowly
Visibility: 70 miles
BHO SA 1455 CLR 70 237/73/49/0510/023/ SKC LGT DSNT HZ/ 51023

1 P.M.
Weather: Clear, few small cumulus SSW-NNW
Temperature: 72F; Dew Point: 50F; Wind: ENE at 10 kts,
Sea-level pressure: 30.24 in. Hg, rising, then falling
Visibility: 70 miles
6-hr Max temp: 75F
6-hr Min temp: 64F
BHO SA 1755 CLR 70 241/72/50/0610/024/ FEW SML CU SSW-NNW
LGT DSNT HZ/ 8/100 50004 10075 20064

SUMMARY FOR FRIDAY, JUNE 17, 2016

TEMPERATURE (DEGREES F)
MAX…..77   NORMAL…..76
MIN…..59   NORMAL…..58
MEAN….68   NORMAL…..67

DEPARTURE FROM 30-YEAR NORMAL…………………….+1
TOTAL DEPARTURE FOR THE MONTH……………………+15 [+0.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……….-2
TOTAL HEATING UNITS FOR THE MONTH…………..34   DEPARTURE………-24
TOTAL HEATING UNITS FOR THE SEASON………..5282   DEPARTURE…….-1079
TOTAL HEATING UNITS LAST SEASON TO DATE……6491   DIFFERENCE……-1209

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………3   DEPARTURE……….-1
TOTAL COOLING UNITS FOR THE MONTH…………..36   DEPARTURE……….-8
TOTAL COOLING UNITS FOR THE SEASON………….84   DEPARTURE………+16
TOTAL COOLING UNITS LAST SEASON TO DATE……..90   DIFFERENCE………-6

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….25 E   AT  1:29 A.M.*
ASOS……………………26 ESE AT 12:22 A.M.
DAVIS…………………..24 E   AT 12:24 A.M. RMY 23
FASTEST MILE FOR YESTERDAY…………………21 E   AT  1:27 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………20 E   AT  1:08 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..19 E   AT  1:30 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.6 NE
ASOS…………………..9.3
DAVIS………………….8.2 ESE [117 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…Trace  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.05  DEPARTURE……-1.67
ASOS…………..1.08
TOTAL PRECIPITATION FOR THE YEAR……….21.12  DEPARTURE……-4.26
ASOS………….21.52

PRELIMINARY CLIMATE SUMMARY FOR JUNE 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

6/1  71/54/63/+1/0.00/860/95                 26 NE  AERO 30 NE  RMY N/A
6/2  68/54/61/-1/0.00/444/49                 21 NE  AERO 22 NE  RMY 21
6/3  70/57/64/+2/T/173/19                    16 SSW AERO 17 SSW RMY 16
6/4  81/61/71/+8/0.00/491/54                 18 S   AERO 21 S   RMY 20
6/5  67/60/64/+1/0.76/000/00                 32 SSE AERO 36 SSE RMY 34
6/6  80/63/72/+9/0.00/747/82                 26 W   AERO 28 W   RMY 27
6/7  83/58/71/+7/0.18/602/66                 32 WNW AERO 36 WNW RMY 33 TSTM
6/8  72/52/62/-2/0.05/684/75                 37 WNW AERO 41 WNW RMY 38 TSTM
6/9  67/48/58/-6/0.00/466/51                 41 WNW AERO 45 WNW RMY 40
6/10 71/50/61/-4/0.00/841/92                 25 W   AERO 28 W   RMY 26
6/11 68/52/60/-5/0.06/…/..                 30 SSW AERO 35 SSW RMY 31
6/12 76/51/64/-1/T/…/..                    41 W   AERO 48 W   RMY 42
6/13 70/49/60/-5/0.00/…/..                 36 NW  AERO 46 NW  RMY 38
6/14 77/50/64/-2/0.00/…/..                 32 NNW AERO 38 NNW RMY 33
6/15 83/60/72/+6/0.00/…/..                 22 NW  AERO 26 NW  RMY 25
6/16 82/62/72/+6/0.00/…/..                 26 E   AERO 28 E   RMY 27
6/17 77/59/68/+1/T/…/..                    25 E   AERO 28 E   RMY 23 TSTM

6/18 low temp since midnight is 55F; normal low now 58F

DAILY RECORDS FOR JUNE 2016
None so far

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR JUNE 18
HIGH 93F IN 1929,1994
LOW 39F IN 1920
PRECIP 3.36 INS 1998
PEAK GUST 48e MPH W IN 1943

RECORDS FOR JUNE 19
HIGH 92F IN 1923
LOW 40F IN 1920
PRECIP 3.92 INS 1922
PEAK GUST 66e MPH NW IN 1940

TODAY’S REPORT PREPARED BY: Mike Iacono