Monday, June 26, 2023

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

MONDAY, JUNE 26, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0409E
SUNSET:  1925E

WARM AND HUMID ONCE AGAIN ON BLUE HILL UNDER PARTIAL SUNSHINE…

Today has almost been a carbon copy of yesterday with the day
starting off with stratus and fog, then lifting to reveal a
mix of sun and clouds. As the sun heated the surface, cumulus
grew to become cumulonimbus as thunderstorms developed
to the west through north of the Hill.

Temperatures here at Blue Hill have reached the low 80s early
this afternoon. With the dew point continuing to hover in the
upper 60s to near 70, it still feels quite sticky out there.
However this is creating plenty of fuel for storms to produce
torrential downpours in spots.

The wind has been on the light side, but is trying to increase
a bit this afternoon. The average speed so far for the day is
only around 8mph, but in the last couple of hours, the average
has been closer to 11mph. The peak gust so far, having occurred
just after the 1pm observation, is around 23mph.

Visibility improved from a 1/4 mile early this morning in fog,
to around 20 miles late this morning and this afternoon, limited
by haziness from the high humidity levels.

The maximum temperature so far today is 82F, this is 3 degrees
above the normal high of 79F. The minimum since midnight is 66F,
which is 5 degrees above the normal low of 61F.

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Today’s Observations:

7 A.M.
Weather: Sky obscured, vertical visibility 200ft
Temperature: 68F; Dew Point: 68F; Relative Humidity: 100%
Wind: S @ 5 kts, wind light
Sea-level pressure: 1011.3 mb; 29.86 in. Hg: rising, then more slowly
Visibility: 1/4 mile, fog
6-hr Max temp: 68F
6-hr Min temp: 66F
24-hr Precip:  0.00 inches
BHO SA 1155 X W2 1/4F 113/68/68/1805/986/ WND LGT/ 8//// 51011
10068 20066

10 A.M.
Weather: Overcast cumulus, few breaks in overcast all quadrants
Temperature: 76F; Dew Point: 69F; Relative Humidity: 79%
Wind: SSW @ 6 kts, wind light
Sea-level pressure: 1011.5 mb; 29.87 in. Hg: rising, then falling
Visibility: 20 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E20 OVC 20 115/76/69/2106/987/ FEW BINOVC ALQDS HAZY
WND LGT/ 8/2// 50002

1 P.M.
Weather: Broken cumulonimbus, broken altocumulus, broken cirrostratus,
broken cirrus, towering cumulus N, few cumulus all quadrants
Temperature: 80F; Dew Point: 69F; Relative Humidity: 69%
Wind: S @ 9 kts
Sea-level pressure: 1010.3 mb; 29.83 in. Hg: falling, then more rapidly
Visibility: 20 miles, hazy
6-hr Max temp: 82F
6-hr Min temp: 68F
6-hr Precip:  0.00 inches
BHO SA 1755 E30 BKN 100 BKN 180 BKN 250 BKN 20 103/80/69/1809/983/
CB WNW-NW MOV N TCU N FEW CU ALQDS VIRGA DSNT WNW-N/ 8/993 58012
10082 20068

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SUMMARY FOR SUNDAY, JUNE 25, 2023

TEMPERATURE (DEGREES F)
MAX…….85   NORMAL…..79
MIN…….67   NORMAL…..61
MEAN……76   NORMAL…..70

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+6
TOTAL DEPARTURE FOR THE MONTH………………..-57 [-2.5 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…….+36
TOTAL HEATING UNITS FOR THE SEASON…………5295  DEPARTURE……-913
TOTAL HEATING UNITS LAST SEASON TO DATE…….5607  DEPARTURE……-312

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY……………11  DEPARTURE……..+6
TOTAL COOLING UNITS FOR THE MONTH……………59  DEPARTURE…….-22
TOTAL COOLING UNITS FOR THE SEASON…………..90  DEPARTURE…….-19
TOTAL COOLING UNITS LAST SEASON TO DATE……..123  DEPARTURE…….-33

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)……….E21 SSW   @  02:24 P.M.
VECTOR #1 (1-Sec)……….21 S     @  06:58 P.M.
VECTOR #2 (1-Sec)……….21 S     @  02:40 P.M.
DAVIS #1……………….21 S     @  03:42 P.M.
DAVIS #2 ………………24 S     @  02:35 P.M.
RMY #1 (Instantaneous)…..21 S     @  06:58 P.M.
RMY #2 (Instantaneous)…..22 S     @  02:40 P.M.
MERLIN…………………19 S
RICHARDS (C5C) (Inst)……21       @  12:46 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………15 SSW @  03:44 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15     @  03:43 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..17     @  03:43 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 SW  @  12:00 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 S   @  03:43 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 SW  @  12:00 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..17 SSW @  03:43 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15     @  12:00 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………. 8.2 SSW [197 total miles] VECTOR #1……………….. 8.7
VECTOR #2……………….. 9.1
DAVIS #1………………… 8.1 SSW
DAVIS #2………………… 9.1 SSW
RMY #1………………….. 8.5 SSW
RMY #2………………….. 9.2 SSW
RICHARDS (C5C)…………… 8.6

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..3.78 DEPARTURE…..-0.18
TOTAL PRECIPITATION FOR THE YEAR…………..24.53 DEPARTURE…..-2.03

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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/…/..             20 E    VEC1 20 NE  RMY 20
6/22  70/58/62/-7/0.01/…/..             22 ENE  VEC1 23 NE  RMY 22
6/23  80/58/69/+0/0.04/…/..             18 SSW  VEC1 19 SSW RMY 19
6/24  77/66/72/+3/0.12/…/..             29 SW   VEC1 29 SW  RMY 31
6/25  85/67/76/+6/0.00/…/..             21 SSW  VEC1 21 S   RMY 21 TSTM

6/26  The low since midnight is 66F, the daily normal low is 61F

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 26
HIGH 96F IN 1952
LOW 45F IN 1986
PRECIP 1.22 INS IN 1938
PEAK GUST 48 MPH N IN 1998

RECORDS FOR JUNE 27
HIGH 93F IN 1999, 2007
LOW 46F IN 1897
PRECIP 1.72 INS IN 1938
PEAK GUST 55e N IN 1945

TODAY’S REPORT PREPARED BY: Matt Douglas