Wednesday, May 17, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
WEDNESDAY, MAY 17, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0421E
SUNSET: 1901E
SUNNY AND BRISK CONDITIONS ON BLUE HILL TODAY…
Plenty of sunshine today at Blue Hill with considerably cooler
temperatures than yesterday. The smoke layer from the wildfires
in Alberta, Canada have moved from our area, however, the pollen
continues to reduce visibility.
Temperatures have been below normal today, as of this afternoon
we still haven’t reached 60F. Relative humidity has continued
to drop throughout the day as well with dew points, making for
very dry air. This has resulted in the region being under a Red
Flag Warning due to the high fire danger.
The wind has been relatively productive today, with an average
speed of around 20mph for the day so far. Gusts have been
exceeding 30mph at times.
Visibility remains to be limited to 40 miles today, despite the
clear skies and low dew points, primarily because of the pollen
in the air.
The high so far today is 59F, which is 8 degrees below our
normal max temperature of 67F. Our low since midnight is 46F,
which is 3 degrees below our normal low temperature of 49F.
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Today’s Observations:
7 A.M.
Weather: Clear, few stratocumulus all quadrants, few altocumulus
distant NNE-SSW, few cirrus distant SE-S
Temperature: 48F; Dew Point: 30F; Relative Humidity: 48%
Wind: N @ 17G26 kts, peak wind NNW 32 mph @ 6:20am
Sea-level pressure: 1005.0 mb; 29.68 in. Hg: rising, then more slowly
Visibility: 40 miles, hazy
6-hr Max temp: 54F
6-hr Min temp: 46F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 40 050/48/30/3517G26/968/ FEW SC ALQDS FEW
AC DSNT NNE-SSE FEW CI DSNT SE-S PK WND 3428/20/ HAZY/
8/571 51025 10054 20046
10 A.M.
Weather: Clear, few stratocumulus all quadrants
Temperature: 53F; Dew Point: 27F; Relative Humidity: 36%
Wind: NNW @ 15G30 kts, peak wind NNW 35 mph @ 9:50am
Sea-level pressure: 1006.8 mb; 29.73 in. Hg: rising, then more rapidly
Visibility: 40 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 40 068/53/27/3415G30/973/ FEW SC ALQDS PK
WND 3430/50/ HAZY/ 8/500 53018
1 P.M.
Weather: Clear, few stratocumulus all quadrants
Temperature: 57F; Dew Point: 24F; Relative Humidity: 27%
Wind: NNW @ 16G27 kts, peak wind NNW 31 mph @ 12:47pm
Sea-level pressure: 1007.7mb; 29.76 in. Hg: rising unsteadily
Visibility: 40 miles, hazy
6-hr Max temp: 59F
6-hr Min temp: 48F
6-hr Precip: 0.00 ins.
BHO SA 1755 CLR 40 077/57/24/3316G27/976/ FEW SC ALQDS PK
WND 3327/47/ HAZY/ 8/500 52009 10059 20048
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SUMMARY FOR TUESDAY, MAY 16, 2023
TEMPERATURE (DEGREES F)
MAX…….80 NORMAL…..67
MIN…….55 NORMAL…..48
MEAN……68 NORMAL…..58
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……..+10
TOTAL DEPARTURE FOR THE MONTH………………..+51 [+3.0 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-8
TOTAL HEATING UNITS FOR THE MONTH…………..106 DEPARTURE…….-54
TOTAL HEATING UNITS FOR THE SEASON…………5077 DEPARTURE……-970
TOTAL HEATING UNITS LAST SEASON TO DATE…….5528 DEPARTURE……-451
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….3 DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE MONTH……………16 DEPARTURE……..+8
TOTAL COOLING UNITS FOR THE SEASON…………..25 DEPARTURE…….+14
TOTAL COOLING UNITS LAST SEASON TO DATE………24 DEPARTURE……..+1
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)……….E38 SW @ 04:46 P.M.
VECTOR #1 (1-Sec)……….42 SW @ 04:46 P.M.
VECTOR #2 (1-Sec)……….41 W @ 04:07 P.M.
DAVIS #1……………….38 WSW @ 04:08 P.M.
DAVIS #2 ………………37 W @ 04:07 P.M.
RMY #1 (Instantaneous)…..41 WSW @ 03:25 P.M.
RMY #2 (Instantaneous)…..40 WSW @ 04:45 P.M.
MERLIN…………………37 WSW
RICHARDS (C5C) (Inst)……41 @ 04:45 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………28 WSW @ 03:51 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..25 @ 04:47 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..27 @ 03:32 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………26 WSW @ 04:08 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………28 WSW @ 04:08 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..26 WSW @ 04:47 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..27 WSW @ 03:52 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………26 @ 03:44 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………15.8 WSW [379 total miles]
VECTOR #1……………….15.3
VECTOR #2……………….15.8
DAVIS #1………………..15.8 WSW
DAVIS #2………………..16.0 W
RMY #1………………….15.0 WSW
RMY #2………………….15.6 WSW
RICHARDS (C5C)…………..14.9
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..0.45 DEPARTURE…..-1.45
TOTAL PRECIPITATION FOR THE YEAR…………..18.65 DEPARTURE…..-2.03
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
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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/…/.. 38 SW VEC1 39 SW RMY 41
5/17 The low since midnight is 46F, the daily normal low is 48F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR MAY 17
HIGH 90F IN 2017
LOW 34F IN 1956, 1957
PRECIP 2.07 INS IN 1916
PEAK GUST 52 MPH SW IN 1967, W IN 1974
RECORDS FOR MAY 18
HIGH 96F IN 2017(RECORD FOR MAY)
LOW 35F IN 2002
PRECIP 1.93 INS IN 2007
SNOW TRACE IN 2002 (Ice pellets)
PEAK GUST 64 MPH SSW IN 2000
TODAY’S REPORT PREPARED BY: Amanda Joly
