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Tuesday, May 9, 2023

May 9, 2023

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA TUESDAY, MAY 9, 2023 ALL TIMES ARE…

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

TUESDAY, MAY 9, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0430E
SUNSET:  1852E

FILTERED SUNSHINE, BUT MUCH COOLER AND BRISK TODAY ON BLUE HILL…

Sunshine has been the theme today, however it’s been filtered
by a combination of some high thin cirrus clouds, and wildfire
smoke aloft being advected over the region from fires in the
Alberta province of Canada. The smoke was thick enough for a
time after sunrise, that the sun looked like a dim red disk in
the sky.

Despite the sunshine, temperatures are much cooler today thanks
to an onshore flow. Readings have only made it to the upper 50s
early this afternoon, after a morning low in the mid 40s.

The wind started off fairly light out of the north early this
morning, then veered through the northeast to the east by this
afternoon. Speeds also increased with a brisk flow coming in
off the ocean. The average speed for the day has been around
8mph thus far since midnight, but closer to 10mph since 7am this
morning. The highest gust so far has been around 23mph.

Visibility has been decent all day with views of around 60 miles.

The maximum temperature so far today is 59F, this is 6 degrees
below the normal high of 65F. The low since midnight is 45F,
which is 1 degree below the normal low of 46F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Thin broken cirrus, smoke layer aloft NW-NE-SE
Temperature: 51F; Dew Point: 32F; Relative Humidity: 48%
Wind: NNE @ 5 kts, wind light
Sea-level pressure: 1014.9 mb; 29.97 in. Hg: rising, then more slowly
Visibility: 60 miles
6-hr Max temp: 51F
6-hr Min temp: 45F
24-hr Precip:  0.00 ins.
BHO SA 1155 E250 -BKN 60 149/51/32/0205/997/ K LYR ALF NW-NE-SE
WND LGT/ 8/001 51014 10051 20045

10 A.M.
Weather: Thin broken cirrus, few small cumulus all quadrants,
smoke layer aloft all quadrants
Temperature: 56F; Dew Point: 29F; Relative Humidity: 35%
Wind: NE @ 10 kts
Sea-level pressure: 1016.1 mb; 30.01in. Hg: rising, then more slowly
Visibility: 60 miles
3-hr Precip:  0.00 ins.
BHO SA 1455 E250 -BKN 60 161/56/29/0510/001/ FEW SML CU ALQDS
K LYR ALF ALQDS/ 8/101 51012

1 P.M.
Weather: Thin broken cirrus, few cumulus all quadrants, smoke
layer aloft all quadrants
Temperature: 57F; Dew Point: 29F; Relative Humidity: 34%
Wind: E @ 8 kts, wind ENE variable ESE
Sea-level pressure: 1016.5 mb; 30.02 in. Hg: rising, then steady
Visibility: 60 miles
6-hr Max temp: 59F
6-hr Min temp: 51F
6-hr Precip:  0.00 ins.
BHO SA 1755 E250 -BKN 60 165/57/29/0908/002/ FEW CU ALQDS
K LYR ALF ALQDS WND 06V12/ 8/201 51004 10059 20051

————————————————————–

SUMMARY FOR MONDAY, MAY 8, 2023

TEMPERATURE (DEGREES F)
MAX…….74   NORMAL…..65
MIN…….49   NORMAL…..46
MEAN……62   NORMAL…..55

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+7
TOTAL DEPARTURE FOR THE MONTH…………………-2 [-0.5 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….3  DEPARTURE……..-7
TOTAL HEATING UNITS FOR THE MONTH……………77  DEPARTURE…….-11
TOTAL HEATING UNITS FOR THE SEASON…………5048  DEPARTURE……-927
TOTAL HEATING UNITS LAST SEASON TO DATE…….5474  DEPARTURE……-426

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE MONTH…………….0  DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE SEASON……………9  DEPARTURE……..+3
TOTAL COOLING UNITS LAST SEASON TO DATE……….0  DEPARTURE……..+9

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)……….E32 NW  @    2:52 P.M.
VECTOR #1 (1-Sec)……….33 NW  @    2:52 P.M.
VECTOR #2 (1-Sec)……….38 NNW @    1:42 P.M.
DAVIS #1……………….34 WNW @    2:52 P.M.
DAVIS #2 ………………33 NNW @    2:52 P.M.
RMY #1 (Instantaneous)…..35 NW  @    2:52 P.M.
RMY #2 (Instantaneous)…..39 NNW @    1:42 P.M.
MERLIN…………………33 NW
RICHARDS (C5C) (Inst)……34     @    2:52 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………25 NW  @    1:51 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22     @    1:16 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..25     @   12:45 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………23 WNW @    1:15 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………25 NW  @   12:45 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..21 WNW @    2:54 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..25 WNW @   12:45 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………22     @    1:16 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………10.9 NW [261 total miles] VECTOR #1……………….10.7
VECTOR #2……………….11.5
DAVIS #1………………..11.0 NW
DAVIS #2………………..11.3 NNW
RMY #1………………….10.5 NW
RMY #2………………….11.3 NNW
RICHARDS (C5C)…………..11.1

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH…………..0.45 DEPARTURE…..-0.54
TOTAL PRECIPITATION FOR THE YEAR…………..18.65 DEPARTURE…..-1.12

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/…/..        26 WNW  VEC1 27 W   RMY 28
5/8   74/49/62/+7/0.03/0.0/…/..         32 NW   VEC1 33 NW  RMY 35

5/9 The low since midnight is 45, the daily normal low is 46F

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

RECORDS FOR MAY 9
HIGH 93F IN 2000
LOW 31F IN 1947
PRECIP 2.72 INCHES IN 1954
SNOWFALL 5.0 INS IN 1977 (RECORD FOR MAY)
PEAK GUST 70e MPH NE IN 1977

RECORDS FOR MAY 10
HIGH 93F IN 1896
LOW 29F  IN 1900
PRECIP 1.85 INS IN 1998
SNOW 2.8 INS 1977 (7.8 INS TOTAL 5/9-5/10 1977)
PEAK GUST 64 MPH S IN 1990

TODAY’S REPORT PREPARED BY: Matt Douglas

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Blue Hill Observatory & Science Center · Legal

Data Use & Privacy Policy

Please read the full Policy before accessing Observatory data · Effective January 1, 2025

Notice: By accessing, downloading, or using any Blue Hill Observatory data or services, you unconditionally accept and agree to be bound by this Policy in its entirety. If you do not agree, you may not access or use Observatory data.
Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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