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Thursday, May 11, 2023

May 12, 2023

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY, MAY 11, 2023 ALL TIMES ARE…

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

THURSDAY, MAY 11, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0427E
SUNSET:  1855E

WARM WITH SUN FILLED SKIES CONTINUING TO BE FILTERED THROUGH A
LAYER OF SMOKE ALOFT…

Today is yet another day with milky skies thanks to the wildfire
smoke from Alberta, Canada. The only difference today, it appears
the smoke has made it into the lower levels of the atmosphere, as
the air has become increasingly hazy as the day has progressed.

Temperatures have rebounded nicely as a warmer air mass pushes
into the region. Readings have reached the 80F mark early this
afternoon.

The wind started off on the light side this morning, and at times
variable, but has seemed to have settled out of the west-northwest
with some increase in speed this afternoon. The average speed for
the day thus far is around 11mph, with the highest gust around
26mph occurring just after the 1pm observation.

As mentioned, the visibility has been decreasing through the day
due to increasing haziness. We could see up to 40 miles early this
morning, but only to 15 miles by early this afternoon.

The maximum temperature so far today is 80F, this is 14 degrees
above the normal high of 66F. The low since midnight is 53F,
which is 6 degrees above the normal low of 47F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Clear, thin smoke layer aloft all quadrants
Temperature: 59F; Dew Point: 39F; Relative Humidity: 47%
Wind: WNW @ 9 kts
Sea-level pressure: 1018.1 mb; 30.06 in. Hg: rising, then more rapidly
Visibility: 40 miles, hazy
6-hr Max temp: 59F
6-hr Min temp: 53F
24-hr Precip:  0.00 ins.
BHO SA 1155 CLR 40 181/59/39/2909/006/ THN K LYR ALF ALQDS
HAZY/ 8/000 53006 10059 20053

10 A.M.
Weather: Clear, thin smoke layer aloft all quadrants
Temperature: 69F; Dew Point: 42F; Relative Humidity: 31%
Wind: W @ 7 kts, wind WSW variable NW
Sea-level pressure: 1018.1 mb; 30.06in. Hg: rising, then falling
Visibility: 25 miles, hazy
3-hr Precip:  0.00 ins.
BHO SA 1455 CLR 25 181/74/42/2807/006/ THN K LYR ALF ALQDS
HAZY WND 25V32/ 8/000 50000

1 P.M.
Weather: Clear, few small cumulus all quadrants, thin smoke layer
aloft all quadrants
Temperature: 78F; Dew Point: 41F; Relative Humidity: 26%
Wind: WNW @ 10G17 kts
Sea-level pressure: 1015.6 mb; 29.99 in. Hg: falling, then more rapidly
Visibility: 15 miles, hazy
6-hr Max temp: 80F
6-hr Min temp: 59F
6-hr Precip:  0.00 ins.
BHO SA 1755 CLR 15 156/78/41/3010G17/999/ FEW SML CU ALQDS
THN K LYR ALF ALQDS HAZY/ 8/100 58025 10080 20059

————————————————————–

SUMMARY FOR WEDNESDAY, MAY 10, 2023

TEMPERATURE (DEGREES F)
MAX…….72   NORMAL…..65
MIN…….51   NORMAL…..47
MEAN……62   NORMAL…..56

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+6
TOTAL DEPARTURE FOR THE MONTH…………………+1 [-0.1 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……………92  DEPARTURE…….-16
TOTAL HEATING UNITS FOR THE SEASON…………5063  DEPARTURE……-932
TOTAL HEATING UNITS LAST SEASON TO DATE…….5507  DEPARTURE……-444

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……..-4
TOTAL COOLING UNITS FOR THE SEASON……………9  DEPARTURE……..+2
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)……….E25 WSW @   02:21 P.M.
VECTOR #1 (1-Sec)……….26 WSW @   02:21 P.M.
VECTOR #2 (1-Sec)……….25 W   @   02:18 P.M.
DAVIS #1……………….25 W   @   02:18 P.M.
DAVIS #2 ………………24 WNW @   11:31 A.M.
RMY #1 (Instantaneous)…..26 WSW @   02:21 P.M.
RMY #2 (Instantaneous)…..25 W   @   02:21 P.M.
MERLIN…………………24 W
RICHARDS (C5C) (Inst)……24     @   02:21 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 W   @   11:09 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..17     @   05:20 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19     @   05:17 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 W   @   05:17 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 W   @   05:17 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..16 W   @   05:20 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..18 W   @   05:17 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………17     @   05:20 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………10.8 W [258 total miles] VECTOR #1……………….10.8
VECTOR #2……………….11.2
DAVIS #1………………..11.2 W
DAVIS #2………………..11.1 WNW
RMY #1………………….10.4 W
RMY #2………………….10.9 WNW
RICHARDS (C5C)…………..11.0

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…..-0.76
TOTAL PRECIPITATION FOR THE YEAR…………..18.65 DEPARTURE…..-1.34

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 60/45/53/-3/0.00/0.0/…/..         24 NE   VEC1 25 NE  RMY 25
5/10  72/51/62/+6/0.00/0.0/…/..         25 WSW  VEC1 26 WSW RMY 26

5/11 The low since midnight is 53, the daily normal low is 47F

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

RECORDS FOR MAY 11
HIGH 90F IN 1993
LOW 28F IN 1900
PRECIP 1.28 INS IN 1957
SNOW 1.0 INS IN 1907 (LATEST MEASURABLE SNOW ON RECORD)
PEAK GUST 75e MPH NW IN 1945

RECORDS FOR MAY 12
HIGH 88F IN 2001
LOW 29F IN 1907
PRECIP 1.49 INCHES IN 1968
SNOW TRACE IN 2019
PEAK GUST 76 MPH S IN 1974

TODAY’S REPORT PREPARED BY: Matt Douglas

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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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