Sunday, June 21, 2015
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, JUNE 21, 2015 FATHERS’ DAY
ALL TIMES ARE IN EASTERN STANDARD TIME
REMNANTS OF BILL PROVIDE MORNING SOAKING
TROPICAL AIR REMAINS IN PLACE THIS AFTERNOON
Light rain began late yesterday evening and continued light for much of the
pre-dawn hours of this Fathers’ Day. By sunrise, however, moderate to
occasionally heavy rain moved into the area. The storm total for this event
so far is 1.18 inches of rain. This rainfall is associated with the remnants
of Tropical Storm Bill, which made landfall in Texas early last week. This
has eliminated our monthly precipitation deficit to date, although our yearly
deficit remains over three inches.
Rainfall let up by the mid-morning hours, and has stopped entirely at times,
but periodic light showers have continued into early afternoon. Tropical air
remains in place as well, with dew points near 70F. Temperatures have been
mirroring the dew point, and our high for the day so far is 70F. Winds were
SSE for much of the morning but have shifted to SW early this afternoon,
running at about 10-15mph with a few gusts over 25mph this morning. Visibility
has been under a mile for most of the day with fog, although clouds did lift
slightly above the summit at times allowing for brief periods of somewhat
higher visibility.
The summer solstice occurred at 12:38 P.M. EDT today, marking the official
start of astronomical summer.
Today’s Observations:
7 A.M.
Weather: Sky obscured by moderate rain and fog, rain occasionally heavy
Temperature: 68F; Dew Point: 68F; Wind: SE at 8 kts
Sea-level pressure: 29.83 ins. Hg, falling
Visibility: 1/16 mile
6-hr Max temp: 68F
6-hr Min temp: 61F
24-hr precip: 0.93 ins.
BHO SA 1155 W2 X 1/16RF 099/68/68/1408/982/ R OCNLY R+/
8//// 57021 ASOS 60079 70087 MANUAL 70093 10068 20061
10 A.M.
Weather: Sky obscured by light rain and fog, stratus fractus drifting above
and below summit
Temperature: 69F; Dew Point: 69F; Wind: S at 11 kts
Sea-level pressure: 29.73 ins. Hg, falling then falling more rapidly
Visibility: 1/8 mile
3-hr precip.: 0.17 ins.
BHO SA 1455 W3 X 1/8 R-F 068/69/69/1711/973/ STFRA DRFTNG ABV AND BLO SMT/
8//// 58031 ASOS 60024 MANUAL 60017
1 P.M.
Weather: Sky obscured by dense fog, stratus fractus drifting above and below
summit, conditions variable
Temperature: 70F; Dew Point: 70F; Wind: WSW at 6 kts
Sea-level pressure: 29.67 ins. Hg, falling then falling more slowly
Visibility: 1/8 mile
6-hr Max temp: 70F
6-hr Min temp: 68F
6-hr precip: 0.25 ins.
BHO SA 1755 W3 X 1/8F 049/70/70/2406/967/ STFRA DRFTNG ABV AND BLO SMT
CNDTS VRB/ 8//// 56019 ASOS 60032 MANUAL 60025 10070 20068
SUMMARY FOR SATURDAY, JUNE 20, 2015
TEMPERATURE (DEGREES F)
MAX…..75 NORMAL…..76
MIN…..56 NORMAL…..59
MEAN….66 NORMAL…..68
DEPARTURE FROM 30-YEAR NORMAL……………………-2
TOTAL DEPARTURE FOR THE MONTH…………………..-32 [-1.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0 DEPARTURE………..-2
TOTAL HEATING UNITS FOR THE MONTH…………..87 DEPARTURE……….+23
TOTAL HEATING UNITS FOR THE SEASON………..6491 DEPARTURE………+125
TOTAL HEATING UNITS LAST SEASON TO DATE……6421 DIFFERENCE………+70
COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………1 DEPARTURE……….-3
TOTAL COOLING UNITS FOR THE MONTH…………..49 DEPARTURE……….-6
TOTAL COOLING UNITS FOR THE SEASON………….98 DEPARTURE………+19
TOTAL COOLING UNITS LAST SEASON TO DATE……..64 DIFFERENCE……..+34
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….23 SSE AT 11:57 P.M. *
ASOS……………………26 SSW AT 4:23 P.M.
DAVIS…………………..23 SSW AT 4:22 P.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………18 SSE AT 11:58 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE………………18 S AT 4:23 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..17 S AT 4:23 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.9 NE
ASOS………………….10.3
DAVIS………………….8.5 ESE [105 deg.]
* Last of several occurrences…
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.93 DEPARTURE….+0.80
ASOS……………0.87
TOTAL PRECIPITATION FOR THE MONTH………..3.11 DEPARTURE….-0.03
ASOS……………3.06
TOTAL PRECIPITATION FOR THE YEAR………. 22.48 DEPARTURE….-3.19
ASOS……………N/A ***
*** ASOS annual totals not available due to erroneous readings
PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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 48/46/47/-15/0.69/000/00 32 NE RMY 34
6/2 47/44/46/-16/…./000/00 28 NNE RMY 28
6/3 59/44/52/-10/0.00/172/19 16 ESE RMY 16
6/4 63/46/55/-8/0.00/445/49 17 E RMY 16
6/5 70/49/60/-3/T/500/55 17 NNE RMY 17
6/6 65/52/59/-4/0.06/382/42 26 ENE RMY 27
6/7 73/49/61/-3/0.00/884/97 28 S RMY 29
6/8 73/50/62/-2/T/310/34 41 SSW RMY 48
6/9 76/61/69/+4/0.03/228/25 29 SSW RMY 32
6/10 82/57/70/+5/0.00/840/92 24 WSW RMY N/A
6/11 85/61/73/+8/0.00/594/65 29 SSW RMY 32
6/12 86/65/76/+11/…./522/57 26 S RMY 29
6/13 83/67/75/+10/T/586/64 24 N RMY 27
6/14 75/61/68/+2/0.00/641/70 21 SSE RMY 21
6/15 61/52/57/-9/…./000/00 25 SE RMY 26
6/16 73/56/65/-1/…./009/01 18 NW RMY N/A
6/17 70/57/64/-3/0.00/…/.. 28 NE RMY 28
6/18 76/54/65/-2/0.00/…/.. 22 S RMY 26
6/19 84/60/72/+5/T/…/.. 24 SSW RMY 22
6/20 75/56/66/-2/…./…/.. 23 SSE RMY N/A
6/21 low since midnight is 60F; normal low is now 59F
DAILY RECORDS FOR JUNE 2015
6/1- NEW RECORD LOW MAXIMUM TEMPERATURE OF 48F
surpasses previous record of 51F in 2004
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR JUNE 21
HIGH 94F IN 2012
LOW 42F IN 1940
PRECIP 1.40 INS 1903
PEAK GUST 51 MPH SSW IN 2000
RECORDS FOR JUNE 22
HIGH 93F IN 1921, 2012
LOW 43F IN 1940
PRECIP 1.57 INS IN 1900
PEAK GUST 74 MPH NW IN 1988
TODAY’S REPORT PREPARED BY: Jonathan O’Brien
