Friday, June 30, 2023

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

FRIDAY, JUNE 30, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0411E
SUNSET:  1925E

HAZY CONDITIONS AND SMOKE LAYER RETURNS TO GREAT BLUE HILL…

The day began mild and sunny, with clear skies, though the
clouds moved in fairly early. Hazy conditions and a smoke layer
has made its way to our skies yet again, due to the Canadian wildfires.

The temperatures quickly climbed to the upper 70’s by the mid
morning with low 80’s reported as a maximum temperature so far
this afternoon. Dew points have remained constant in the mid 60’s
giving a very sticky feel to the air. Adding the sunshine and low
winds to the formula makes for a very summery feel!

The wind was light with some calm readings to the start of the day.
Fortunately, the wind has picked up a bit this afternoon with the
highest peak gust after the last observation of about 17mph. The
average so far has only been about 6 mph.

Visibility has been limited due to the smoke and hazy conditions;
we have seen about 30-40 miles for most of the day.

The maximum temperature so far today is 81F, this is 1 degree
above the normal high of 80F. The minimum since midnight is 63F,
which is 1 degree above the normal low of 62F.

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Today’s Observations:

7 A.M.
Weather: Clear, few cumulus SSW, few altocumulus NNW-SW
Temperature: 70F; Dew Point: 66F; Relative Humidity: 87%
Wind: Calm
Sea-level pressure: 1019.6 mb; 30.10 in. Hg: rising, then more slowly
Visibility: 30 miles, hazy, smoke layer aloft all quadrants
6-hr Max temp: 70F
6-hr Min temp: 63F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 30 196/70/66/0000/010/ FEW CU SSW FEW AC NNW-SW K LYR ALF
ALQDS HAZY WND CALM/ 8/130 51011 10070 20063

10 A.M.
Weather: Broken cumulus all quadrants, smoke layer aloft all quadrants
Temperature: 78F; Dew Point: 64F; Relative Humidity: 64%
Wind: ESE @ 7 kts
Sea-level pressure: 1020.0 mb; 30.12 in. Hg: rising, then falling
Visibility: 30 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E40 BKN 30 020/78/64/1107/012/ K LYR ALF ALQDS HAZY/ 8/200 50003

1 P.M.
Weather: Broken cumulus, broken altocumulus, smoke layer aloft all quadrants
Temperature: 77F; Dew Point: 66F; Relative Humidity: 71%
Wind: E @ 7 kts
Sea-level pressure: 1019.1 mb; 30.09 in. Hg: falling, then more rapidly
Visibility: 40 miles, hazy
6-hr Max temp: 77F
6-hr Min temp: 70F
6-hr Precip: 0.00 inches
BHO SA 1755 E40 BKN 50 BKN 40 191/77/66/1007/009/ K LYR ALF ALQDS HAZY/
8/250 58009 10077 20070

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SUMMARY FOR THURSDAY, JUNE 29, 2023

TEMPERATURE (DEGREES F)
MAX…….81   NORMAL…..80
MIN…….64   NORMAL…..62
MEAN……73   NORMAL…..71

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+2
TOTAL DEPARTURE FOR THE MONTH………………..-48 [-1.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH……………99  DEPARTURE…….+34
TOTAL HEATING UNITS FOR THE SEASON…………5295  DEPARTURE……-915
TOTAL HEATING UNITS LAST SEASON TO DATE…….5610  DEPARTURE……-315

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….8  DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE MONTH……………89  DEPARTURE…….-16
TOTAL COOLING UNITS FOR THE SEASON………….120  DEPARTURE…….-13
TOTAL COOLING UNITS LAST SEASON TO DATE……..149  DEPARTURE…….-29

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)……….E18 S     @  07:38 P.M.
VECTOR #1 (1-Sec)……….21 S     @  07:38 P.M.
VECTOR #2 (1-Sec)……….23 S     @  07:38 P.M.
DAVIS #1……………….21 S     @  07:33 P.M.
DAVIS #2 ………………25 S     @  07:38 P.M.
RMY #1 (Instantaneous)…..22 S     @  07:38 P.M.
RMY #2 (Instantaneous)…..23 S     @  07:38 P.M.
MERLIN…………………19 S
RICHARDS (C5C) (Inst)……20       @  07:38 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 S   @  07:39 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..25     @  07:39 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17     @  07:39 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 S   @  07:39 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………19 S   @  07:39 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 S   @  07:39 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 SSW @  07:39 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14     @  07:39 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………..6.7 SSW [161 total miles] VECTOR #1…………………7.2
VECTOR #2…………………7.5
DAVIS #1………………….6.6 SSW
DAVIS #2………………….7.4 SSW
RMY #1……………………7.5 SW
RMY #2……………………7.6 SW
RICHARDS (C5C)…………….7.3

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.13
TOTAL PRECIPITATION FOR THE MONTH…………..4.43 DEPARTURE…..-0.07
TOTAL PRECIPITATION FOR THE YEAR…………..25.18 DEPARTURE…..-1.92

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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   88/56/72/+10/0.00/859/95            21 WSW  VEC1 21 WSW RMY 21
6/2   91/53/72/+10/0.53/634/70            37 ENE  VEC1 39 ENE RMY 37 TSTM
6/3   53/43/48/-14/0.16/000/00            36 NE   VEC1 38 NE  RMY 36
6/4   52/43/48/-15/0.17/009/01            30 N    VEC1 32 N   RMY 29
6/5   58/47/53/-10/0.08/027/03            22 N    VEC1 24 N   RMY 23
6/6   72/50/61/-2/T/582/64                31 NNW  VEC1 31 NNW RMY 26 TSTM
6/7   65/50/58/-6/0.00/301/33             28 NW   VEC1 29 NW  RMY 29
6/8   64/51/58/-6/T/191/21                13 WNW  VEC1 13 WNW RMY 10
6/9   64/49/57/-7/0.47/210/23             20 WNW  VEC1 21 ESE RMY 20 TSTM
6/10  67/51/59/-6/0.05/365/40             26 WNW  VEC1 26 WNW RMY 26 TSTM
6/11  80/55/68/+3/0.00/823/90             23 S    VEC1 24 S   RMY 24
6/12  79/60/70/+5/0.15/439/48             32 SSE  VEC1 33 SSE RMY 31
6/13  78/59/69/+3/0.03/421/46             26 SE   VEC1 27 SE  RMY 24
6/14  78/57/68/+2/0.06/448/49             38 S    VEC1 39 S   RMY 39 TSTM
6/15  77/56/67/+1/0.00/559/61             23 WNW  VEC1 22 WNW RMY 22
6/16  81/61/71/+4/T/513/56                20 W    VEC1 19 SSW RMY 19
6/17  64/55/60/-7/1.86/000/00             21 NE   VEC1 21 NE  RMY 21
6/18  70/56/63/-4/0.05/321/35             20 WNW  VEC1 20 WNW RMY 20
6/19  67/54/61/-7/0.00/284/31             20 SE   VEC1 20 SE  RMY 18
6/20  71/53/62/-6/T/367/40                20 ESE  VEC1 20 ESE RMY 20
6/21  69/53/61/-7/0.00/826/90             20 E    VEC1 20 NE  RMY 20
6/22  70/58/62/-7/0.01/789/86             22 ENE  VEC1 23 NE  RMY 22
6/23  80/58/69/+0/0.04/303/33             18 SSW  VEC1 19 SSW RMY 19
6/24  77/66/72/+3/0.12/220/24             29 SW   VEC1 29 SW  RMY 31
6/25  85/67/76/+6/0.00/660/72             21 SSW  VEC1 21 S   RMY 21 TSTM
6/26  82/66/74/+4/T/385/42                23 S    VEC1 27 S   RMY 25
6/27  77/65/71/+1/0.38/275/30             38 SSW  VEC1 39 SSW RMY 39 TSTM
6/28  78/66/72/+2/0.25/…/..             29 SSW  VEC1 29 SSW RMY 28 TSTM
6/29  81/64/73/+2/0.00/…/..             18 S    VEC1 21 S   RMY 22

6/30  The low since midnight is 63F, the daily normal low is 62F

DAILY RECORDS

06/02/2023: TIED RECORD HIGH MAXIMUM TEMPERATURE OF 91F,
ALSO SET IN 1895

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

RECORDS FOR JUNE 30
HIGH 94F IN 1964
LOW 47F IN 1919
PRECIP 3.04 INS IN 1921
PEAK GUST 51 MPH WNW IN 1957

RECORDS FOR JULY 1
HIGH 98F IN 1964
LOW 44F IN 1988 [RECORD FOR MONTH] PRECIP 4.46 INS IN 1915 [RECORD FOR MONTH] PEAK GUST 52 MPH WNW IN 1974

TODAY’S REPORT PREPARED BY: Amanda Joly