Tuesday, May 30, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, MAY 30, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0411E
SUNSET: 1913E
CLEAR SKIES AND PLEASANT TEMPERATURES, BUT SMOKY AIR HAS MOVED
INTO THE REGION….
Wildfire smoke from Nova Scotia has backed into the area from off
the ocean this morning, giving us reduced visibility and the odor
of smoke this afternoon. As a matter of fact, there is enough
particulate in the air, that an Air Quality Alert has been issued
until midnight tonight.
Despite the smoke, skies have been completely clear today giving
us abundant sunshine. Temperatures have been quite pleasant with
readings reaching the upper 60s to low 70s, which is about normal
for this time of year.
The wind has been rather light today with an average speed of only
around 7mph. The highest gust so far today is a meager 16mph!
Definitely not a nice day for those who like wind!
Visibility started the day around 40 miles, but has been reduced
as mentioned above, by the increasing smoke. Values this afternoon
have varied between 6 to 20 miles. At the 1pm observation, the
prevailing visibility was only around 10 miles.
It should be noted that the extended period of dry weather has
been quite notable. For the month of May to date, we’ve only seen
10 days with measurable rainfall. Of those 10, only 2 had more
than a tenth of an inch, one of which being the big rain event
on the 20th. 81% of the total rainfall for the month fell in that
one storm, with more than half of that falling in a 2 hour period!
The maximum temperature so far today is 68F, which is 2F degrees
below the normal high of 70F. The minimum temperature so far since
midnight is 46F, which is 6 degrees below the normal low of 52F.
————————————————————–
Today’s Observations:
7 A.M.
Weather: Clear, few stratocumulus distant all quadrants, few cirrus
distant NW-NE, thin smoke layer aloft all quadrants
Temperature: 54F; Dew Point: 43F; Relative Humidity: 66%
Wind: ESE @ 5 kts, wind light
Sea-level pressure: 1025.5 mb; 30.28 in. Hg: rising, then falling
Visibility: 40 miles, hazy
6-hr Max temp: 54F
6-hr Min temp: 46F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 40 255/54/43/1105/028/ FEW SC DSNT ALQDS
FEW CI DSNT NW-NE THN K LYR ALF ALQDS HAZY WND LGT/
8/501 50008 10054 20046
10 A.M.
Weather: Clear, smoke layer aloft all quadrants
Temperature: 62F; Dew Point: 46F; Relative Humidity: 54%
Wind: ENE @ 4 kts, wind light and variable
Sea-level pressure: 1025.5 mb; 30.28 in. Hg: rising, then falling
Visibility: 40 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 40 255/62/46/0604/028/ K LYR ALF ALQDS HAZY
WND L/V/ 8/000 50000
1 P.M.
Weather: Clear, thin smoke all quadrants
Temperature: 67F; Dew Point: 40F; Relative Humidity: 40%
Wind: S @ 6 kts, wind light
Sea-level pressure: 1024.8 mb; 30.26 in. Hg: rising, then falling
Visibility: 10 miles, 8 SW, 15 NW, 20 N, hazy
6-hr Max temp: 68F
6-hr Min temp: 54F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 10 248/67/40/1806/026/ THN K ALQDS HAZY
VSBY 8 SW 15 NW 20 N WND LGT/ 8/000 58007 10068 20054
————————————————————–
SUMMARY FOR MONDAY, MAY 29, 2023
TEMPERATURE (DEGREES F)
MAX…….65 NORMAL…..70
MIN…….48 NORMAL…..52
MEAN……57 NORMAL…..61
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………-4
TOTAL DEPARTURE FOR THE MONTH………………..+29 [+0.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….8 DEPARTURE……..+2
TOTAL HEATING UNITS FOR THE MONTH…………..207 DEPARTURE…….-40
TOTAL HEATING UNITS FOR THE SEASON…………5178 DEPARTURE……-956
TOTAL HEATING UNITS LAST SEASON TO DATE…….5566 DEPARTURE……-388
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH……………22 DEPARTURE………0
TOTAL COOLING UNITS FOR THE SEASON…………..31 DEPARTURE……..+6
TOTAL COOLING UNITS LAST SEASON TO DATE………51 DEPARTURE…….-20
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated
F420C (Official)……….E43 ENE @ 03:27 A.M.
VECTOR #1 (1-Sec)……….44 ENE @ 03:27 A.M.
VECTOR #2 (1-Sec)……….45 ENE @ 03:27 A.M.
DAVIS #1……………….39 ENE @ 03:25 A.M.
DAVIS #2 ………………41 ENE @ 03:27 A.M.
RMY #1 (Instantaneous)…..45 ENE @ 03:19 A.M.
RMY #2 (Instantaneous)…..46 ENE @ 03:24 A.M.
MERLIN…………………40 ENE
RICHARDS (C5C) (Inst)……42 @ 03:42 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………29 ENE @ 04:13 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..24 @ 03:26 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..28 @ 03:49 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………27 ENE @ 03:43 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………28 E @ 03:49 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..25 ENE @ 03:43 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..27 ENE @ 03:49 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………25 @ 03:43 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………13.7 ENE [329 total miles]
VECTOR #1……………….12.7
VECTOR #2……………….13.9
DAVIS #1………………..14.0 E
DAVIS #2………………..14.1 E
RMY #1………………….13.0 E
RMY #2………………….13.6 E
RICHARDS (C5C)…………..13.5
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..2.55 DEPARTURE…..-0.99
TOTAL PRECIPITATION FOR THE YEAR…………..20.75 DEPARTURE…..-1.57
SNOWFALL (INCHES) THROUGH THIS MORNING (EST):
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE MONTH………………..0.0 DEPARTURE…….0.0
TOTAL SNOWFALL FOR THE SEASON (2022-2023)……34.9 DEPARTURE…..-34.8
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR MAY CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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
5/1 63/45/54/+1/0.04/0.0/540/64 44 SSE VEC1 46 SSE RMY 48
5/2 57/43/50/-4/0.22/0.0/144/17 33 S VEC1 34 S RMY 35
5/3 55/42/49/-5/0.01/0.0/093/11 25 E VEC1 25 E RMY 25
5/4 45/40/43/-11/0.07/0.0/009/01 29 NE VEC1 29 NE RMY 29
5/5 59/43/51/-4/0.07/0.0/367/43 18 NE VEC1 19 NE RMY 19
5/6 74/43/59/+4/0.00/0.0/847/99 25 NW VEC1 26 NW RMY 26
5/7 78/52/65/+10/0.01/0.0/789/92 26 WNW VEC1 27 W RMY 28
5/8 74/49/62/+7/0.03/0.0/800/93 32 NW VEC1 33 NW RMY 35
5/9 60/45/53/-3/0.00/0.0/819/95 24 NE VEC1 25 NE RMY 25
5/10 72/51/62/+6/0.00/0.0/830/96 25 WSW VEC1 26 WSW RMY 26
5/11 81/53/67/+11/T/0.0/729/84 30 W VEC1 30 W RMY 30
5/12 84/57/71/+14/T/0.0/687/79 31 WNW VEC1 35 WNW RMY 34
5/13 81/58/70/+13/0/0.0/715/82 28 NNW VEC1 30 NNW RMY 35
5/14 66/47/57/0/0.00/0.0/822/94 28 NNW VEC1 29 NNW RMY 31
5/15 72/45/59/+2/0.00/0.0/675/77 33 W VEC1 35 W RMY 34
5/16 80/55/68/+10/0.00/0.0/500/57 38 SW VEC1 39 SW RMY 41
5/17 62/37/50/-8/0.00/0.0/836/95 36 NNW VEC1 37 NNW RMY 40
5/18 64/34/49/-9/0.00/0.0/847/96 26 SSW VEC1 28 SSW RMY 28
5/19 68/42/55/-3/0.00/0.0/751/85 36 SSW VEC1 36 SSW RMY 34
5/20 65/51/58/-1/1.97/0.0/018/02 38 S VEC1 39 S RMY 39
5/21 73/55/64/+5/0.09/0.0/533/60 29 SSW VEC1 30 SSW RMY 31
5/22 59/46/53/-6/0.00/0.0/782/88 36 ENE VEC1 38 ENE RMY 39
5/23 65/45/55/-4/0.00/0.0/…/.. 17 SE VEC1 18 SE RMY 18
5/24 75/44/60/0/0.04/0.0/…/.. 35 NW VEC1 36 NW RMY 38
5/25 67/47/57/-3/0.00/0.0/…/.. 25 NNW VEC1 25 NNW RMY 26
5/26 70/44/57/-3/0.00/0.0/…/.. 20 N VEC1 21 N RMY 22
5/27 80/48/64/+4/0.00/0.0/…/.. 23 SSW VEC1 23 SSW RMY 23
5/28 86/56/71/+10/0.00/0.0/…/.. 23 SW VEC1 24 SW RMY 25
5/29 65/48/57/-4/0.00/0.0/…/.. 43 ENE VEC1 44 ENE RMY 45
5/30 The low since midnight is 46F, the daily normal low is 52F
DAILY RECORDS
05/18/2023: NEW RECORD LOW MINIMUM TEMPERATURE OF 34F,
THIS BEATS THE OLD RECORD OF 35F SET IN 2002
05/20/2023: NEW RECORD DAILY PRECIPITATION OF 1.97 INCHES,
THIS BEATS THE OLD RECORD OF 1.65 INCHES SET IN 1969
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR MAY 30
HIGH 93F IN 1929
LOW 39F IN 1949,1961
PRECIP 1.28 INS 1948
PEAK GUST 61e MPH NW IN 1945
RECORDS FOR MAY 31
HIGH 92F IN 1944,1987,2013
LOW 35F IN 1961
PRECIP 5.02 INS 1984 (RECORD FOR MAY)
PEAK GUST 54e MPH WNW IN 1945
TODAY’S REPORT PREPARED BY: Matt Douglas
