Tuesday, June 18, 2024
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, JUNE 18, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0407E
SUNSET: 1924E
HAZY SUNSHINE, HOT, AND HUMID AS THE MUCH ANTICIPATED HEATWAVE
BEGINS….
Day 1 of the expected heatwave has begun as we have reached the
low 90s today under hazy sunshine. A thin layer of broken cirrus
has been covering the sky all day, adding to the milky appearance
to the air. Cumulus clouds have also popped up early this
afternoon as the convective temperature has been reached.
Today of course is the first 90F degree temperature of the season,
the first of what I suspect may be many this summer. Stay tuned!
The record high for today is 93F set in 1929 and 1994, while
we’re getting close, I don’t think we’ll make it today. However
we will be watching the records for tomorrow and Thursday closely
as we have a better shot of tying or exceeding those. The record
for tomorrow is 92F set in 1923, and the record for Thursday is
94F set in 1953.
Humidity levels are flirting with oppressive territory as the
dew point has reached 71F today. This is of course the highest
dew point of the season so far as well. Definitely a day to take
it easy if you must be outdoors. The better bet is to remain
indoors with air conditioning. In either case, staying hydrated
is very important on days like this.
Unfortunately, the wind has been on the light side today, thus
offering little or no ventilation. It’s been mainly out of the
southwest averaging at around 11mph for the day so far, however
this average is a bit misleading as it was windier during the
predawn hours than it has been during the mid morning hours
onward. The peak gust so far is 23mph, which occurred just
after 1am this morning.
Visibility has been limited most of the day due to haziness. The
view has been between decreasing from 30 miles early this morning
to only 20 miles by early this afternoon.
The maximum temperature so far today is 91 degrees, which is
15 degrees above the normal high of 76F. The minimum temperature
since midnight is 64F, which is 5 degrees above the normal
low of 59F.
With this June heatwave taking shape, here is the ranking for
longest June Heatwaves here at Blue Hill, as compiled by our
Chief Scientist Mike Iacono.
BHO Longest June Heatwaves, days (1885-2023):
1) 4, 3-6 June 1925 (93/94/91/95)
4, 7-10 June 2008 (91/91/94/98)
3) 3, 3-5 June 1919 (98/99/92)
3, 19-21 June 1923 (92/91/90)
3, 13-15 June 1956 (92/93/92)
3, 8-10 June 1984 (94/92/92)
3, 13-15 June 1988 (93/92/94)
3, 27-29 June 1991 (91/95/91)
3, 17-19 June 1994 (91/93/90)
3, 26-28 June 1999 (90/93/91)
3, 20-22 June 2012 (93/94/93)
3, 6-8 June 2021 (91/92/92)
3, 28-30 June 2021 (93/95/94)
————————————————————–
Today’s Observations:
7 A.M.
Weather: Thin broken cirrus, few altocumulus distant NW-ESE
Temperature: 70F; Dew Point: 65F; Relative Humidity: 82%
Wind: WSW @ 8 kts
Sea-level pressure: 1023.8 mb; 30.23 in. Hg: rising, then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 70F
6-hr Min temp: 64F
24-hr Precip: 0.00 inches
BHO SA 1155 E250 -BKN 30 238/70/65/2508/023/ FEW AC DSNT NW-ESE
HAZY/ 8/051 51015 10070 20064
10 A.M.
Weather: Thin broken cirrus
Temperature: 82F; Dew Point: 70F; Relative Humidity: 67%
Wind: SSW @ 4 kts, wind light
Sea-level pressure: 1024.5 mb; 30.25 in. Hg: rising, then more slowly
Visibility: 25 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E250 -BKN 25 245/82/70/2104/025/ HAZY WND LGT/ 8/001 51007
1 P.M.
Weather: Scattered cumulus, thin scattered cirrus
Temperature: 91F; Dew Point: 71F; Relative Humidity: 52%
Wind: SSW @ 7 kts
Sea-level pressure: 1023.5 mb; 30.22 in. Hg: falling unsteadily
Visibility: 20 miles, hazy
6-hr Max temp: 91F
6-hr Min temp: 70F
6-hr Precip: 0.00 inches
BHO SA 1755 45 SCT 250 -SCT 20 235/91/71/2107/022/ HAZY HX 98/
8/201 57010 10091 20070
————————————————————–
SUMMARY FOR MONDAY, JUNE 17, 2024
TEMPERATURE (DEGREES F)
MAX…….80 NORMAL…..76
MIN…….56 NORMAL…..58
MEAN……68 NORMAL…..67
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+1
TOTAL DEPARTURE FOR THE MONTH…………………….+40 [+2.2 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH……………11 DEPARTURE…….-43
TOTAL HEATING UNITS FOR THE SEASON…………5390 DEPARTURE……-809
TOTAL HEATING UNITS LAST SEASON TO DATE…….5279 DEPARTURE……+111
COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….3 DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH……………40 DEPARTURE……..-5
TOTAL COOLING UNITS FOR THE SEASON…………..77 DEPARTURE……..+5
TOTAL COOLING UNITS LAST SEASON TO DATE………68 DEPARTURE……..+9
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated
F420C (Official)……….E30 SSW @ 03:08 P.M.
VECTOR #1 (1-Sec)……….31 SSW @ 04:22 P.M.
VECTOR #2 (1-Sec)……….31 SSW @ 12:46 P.M.
DAVIS #1……………….33 S @ 03:09 P.M.
DAVIS #2 ………………35 S @ 01:46 P.M.
RMY #1 (Instantaneous)…..31 SSW @ 03:00 P.M.
RMY #2 (Instantaneous)…..33 SSW @ 03:21 P.M.
MERLIN…………………28 SW
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………23 SSW @ 03:21 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22 @ 03:22 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23 @ 03:22 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 S @ 03:21 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………24 S @ 03:22 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 SSW @ 03:23 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 SSW @ 03:22 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……13.9 SSW [334 total miles]
VECTOR #1…………….13.9
VECTOR #2…………….14.8
DAVIS #1……………..13.4 SSW
DAVIS #2……………..14.8 SSW
RMY #1……………….13.7 SSW
RMY #2……………….15.0 SSW
RICHARDS (C5C)…………OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.17
TOTAL PRECIPITATION FOR THE MONTH…………..1.38 DEPARTURE…..-1.38
TOTAL PRECIPITATION FOR THE YEAR (2024)…….32.20 DEPARTURE…..+6.84
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY: R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M: Missing data
6/1 79/53/66/+4/0.00/878/97 18 WNW VEC1 20 NW RMY 20
6/2 83/52/68/+6/0.00/780/86 21 W VEC1 21 W RMY 21
6/3 78/57/68/+6/0.00/626/69 22 NE VEC1 22 NE RMY 21
6/4 75/55/65/+2/0.00/817/90 20 SSW VEC1 19 SSW RMY 19
6/5 84/56/70/+7/T/564/62 29 SW VEC1 28 SW RMY 29
6/6 74/60/67/+4/0.01/064/07 20 SSE VEC1 20 SSE RMY 20
6/7 80/60/70/+6/0.14/410/45 26 WNW VEC1 27 WNW RMY 27
6/8 73/54/64/0/T/767/84 48 W VEC1 49 W RMY 47
6/9 67/55/61/-3/0.25/292/32 29 WNW VEC1 28 WNW RMY 26
6/10 75/54/65/0/T/868/95 28 W VEC1 27 W RMY 27
6/11 71/53/62/-3/0.00/320/35 16 WNW VEC1 15 WNW RMY 15
6/12 76/59/68/+3/0.00/531/58 16 S VEC1 16 SSE RMY 17
6/13 82/57/70/+4/0.00/…/.. 28 SW VEC1 27 SW RMY 28
6/14 84/63/74/+9/0.75/…/.. 50 NW VEC1 50 NW RMY 53 TSTM
6/15 75/54/66/0/0.23/…/.. 23 NNW VEC1 27 NW RMY 26
6/16 72/51/62/-5/0.00/…/.. 22 SSE VEC1 23 S RMY 23
6/17 80/56/68/+1/0.00/…/.. 30 SSW VEC1 31 SSW RMY 31
6/18 The low since midnight is 64F, the daily normal low is 59F.
————————————————————–
JUNE DAILY RECORDS TO DATE
NONE.
————————————————————–
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: Matt Douglas
