Wednesday, June 13, 2018

| June 13, 2018 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, JUNE 13, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

SKIES TURN OVERCAST TODAY WITH CONTINUED BREEZY CONDITIONS

It was a mostly sunny start to the day at Blue Hill, but an approaching warm
front caused clouds to stream into the region from the west by mid-morning.
Skies have been near overcast since then, with a few raindrops also observed
but no measurable rainfall so far. The temperature quickly jumped into the low
70s this morning, but the advancing clouds have limited the rise from there.
The high so far is 74F. Dew points have hovered just above 60F, an increase
from previous days, signaling a more humid air mass in place.

The breezy conditions of yesterday continued into today. Yesterday’s 17.2 mph
average wind speed was the highest since April 16. A peak gust of 37 mph
occurred yesterday, with 35 mph being today’s peak gust so far, and sustained
winds remaining around 15 mph. The pressure has steadily fallen in advance of
the approaching frontal system.

Today’s Observations:

7 A.M.
Weather: Scattered cirrus, band of stratocumulus SSE-W, few altocumulus
castellanus SW
Temperature: 64F; Dew Point: 55F; Wind: SW at 12 kts
Sea-level pressure: 29.99 ins. Hg, about steady
Visibility: 50 miles, distant haze
6-hr Max temp: 64F
6-hr Min temp: 56F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 SCT 50 156/64/55/2312/999/ BAND SC SSE-W
FEW ACC SW DSNT HZ/ 8/581 55000 10064 20056

10 A.M.
Weather: Light rain (very light), broken stratocumulus, overcast altostratus
Temperature: 69F; Dew Point: 61F; Wind: SW at 22G30 kts,
Peak Wind: 30 kts (35 mph) SW at 9:53 A.M.
Sea-level pressure: 29.94 ins. Hg, falling then more rapidly
Visibility: 45 miles
3-hr Precip: Trace
BHO SA 1455 E40 BKN 70 OVC 45R- 142/69/61/22022G30/994/
PCPN VRY LGT PK WND 2230/53/ 8/72/ 58014 MANUAL 6000/

1 P.M.
Weather: Broken stratocumulus, broken altocumulus, overcast altostratus
Temperature: 73F; Dew Point: 61F; Wind: S at 12G22 kts,
Wind: Direction variable SSE-SW
Sea-level pressure: 29.88 ins. Hg, falling then more rapidly
Visibility: 50 miles, distant haze
6-hr Max temp: 74F
6-hr Min temp: 64F
6-hr precip: Trace
BHO SA 1755 E25 BKN 80 BKN 120 OVC 50 119/73/61/1912G22/988/
DSNT HZ WND 15V22/ 8/77/ 58023 MANUAL 6000/ 10074 20064

SUMMARY FOR TUESDAY, JUNE 12, 2018

TEMPERATURE (DEGREES F)
MAX…..77   NORMAL…..74
MIN…..49   NORMAL…..56
MEAN….63   NORMAL…..65

DEPARTURE FROM 30-YEAR NORMAL…………………….-2
TOTAL DEPARTURE FOR THE MONTH……………………-28 [-2.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..2   DEPARTURE………..-1
TOTAL HEATING UNITS FOR THE MONTH………….58   DEPARTURE……….+12
TOTAL HEATING UNITS FOR THE SEASON……….5905   DEPARTURE………-444
TOTAL HEATING UNITS LAST SEASON TO DATE…..5721   DIFFERENCE……..+184

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE……….-3
TOTAL COOLING UNITS FOR THE MONTH…………..12   DEPARTURE………-15
TOTAL COOLING UNITS FOR THE SEASON………….74   DEPARTURE………+23
TOTAL COOLING UNITS LAST SEASON TO DATE……..94   DEPARTURE………-20

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..37  SW  AT 12:41 P.M.
AERO…………………….37  SW  AT  4:35 P.M.*
ASOS…………………….39  SW  AT 12:43 P.M.
DAVIS……………………38  M   AT  3:38 P.M.** RMY 39
FASTEST MILE FOR YESTERDAY………………….27  SSW AT  3:36 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE……………….28  SW  AT  3:36 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………28  M   AT  3:35 P.M.**
AVERAGE WIND SPEED AND DIRECTION…………. .17.2 SW
ASOS……………………16.4
DAVIS…………………..16.5
*Last of several occurrences
**Davis direction malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.01  DEPARTURE……-0.96
ASOS…………..1.04
TOTAL PRECIPITATION FOR THE YEAR……….28.33  DEPARTURE……+3.88
ASOS………….29.91

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
M:    Missing data

6/01 78/62/70/+8/T/…/..            21 S   AERO 21 S   RMY N/A
6/02 79/54/67/+5/0.00/…/..         26 ENE AERO 25 ENE RMY 27
6/03 59/45/52/-10/0.00/…/..        28 ENE AERO 25 ENE RMY N/A
6/04 52/45/49/-14/…/…/..         29 ENE AERO 26 ENE RMY 29
6/05 64/47/56/-7/…./…/..         24 N   AERO 21 N   RMY 23 TSTM
6/06 66/50/58/-5/0.00/…/..         23 S   AERO 21 S   RMY 22
6/07 69/50/60/-4/0.00/…/..         25 S   AERO 25 S   RMY 27
6/08 79/52/66/+2/0.00/…/..         20 SW  AERO 17 SW  RMY 18
6/09 79/58/69/+5/0.00/…/..         22 W   AERO 21 W   RMY 22
6/10 72/56/64/-1/0.00/…/..         20 S   AERO 18 S   RMY 17
6/11 68/51/60/-5/0.00/…/..         21 ENE AERO 20 SSW RMY N/A
6/12 77/49/63/-2/0.00/…/..         37 SW  AERO 37 SW  RMY 39

6/13 Low temp since midnight is 56F; normal low is now 57F

DAILY RECORDS FOR JUNE 2018

None so far.

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

RECORDS FOR JUNE 13
HIGH 93F IN 1988
LOW 43F IN 1982
PRECIP 6.07 INS 1998 [Record for month]
PEAK GUST 69 MPH N IN 1956

RECORDS FOR JUNE 14
HIGH 93F IN 1956
LOW 41F IN 1912
PRECIP 1.49 INS 1896
PEAK GUST 55 MPH WNW IN 1958

TODAY’S REPORT PREPARED BY: Jonathan O’Brien and Devin Richardt

 

Category: Daily Discussions

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