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Thursday, July 13, 2023

July 13, 2023

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA THURSDAY, JULY 13, 2023 ALL TIMES ARE…

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

THURSDAY, JULY 13, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0419E
SUNSET:  1921E

HAZY, HOT, AND HUMID WITH INCREASING CLOUD COVER AT BLUE HILL….

Sunshine was the theme this morning under only some high thin
cirrus clouds. However as the afternoon progressed, cumulus
have developed in the unstable air mass. Also the cirrus has
transformed to a thicker and lower cirrostratus layer that is
now enough to dim the sun.

Despite the increasing cloud cover, temperatures have still
reached the upper 80s to near 90. With the dew point hanging
out in the mid to upper 60s, it is once again on the sticky
side out there.

The wind, which started the day off on the light side, has
increased a bit early this afternoon as the pressure gradient
tightens a little. The average speed so far for the day is
around 8mph, but has perked up to around 14mph in the last
hour or so. The peak gust so far is around 29mph, occurring
just after 12pm.

Visibility has been limited today due to haziness, generally
holding between 15-20 miles.

The maximum temperature so far today is 88F, this is 6 degrees
above the normal high of 82F. The minimum since midnight is 70F,
which is 6 degrees above the normal low of 64F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Thin broken cirrus
Temperature: 74F; Dew Point: 68F; Relative Humidity: 81%
Wind: SSW @ 5 kts, wind light
Sea-level pressure: 1014.4 mb; 29.96 in. Hg: rising, then more slowly
Visibility: 15 miles, hazy
6-hr Max temp: 74F
6-hr Min temp: 70F
24-hr Precip: 0.00 inches
BHO SA 1155 E250 -BKN 15 144/74/68/2005/996/ HAZY WND LGT/
8/001 51010 10074 20070

10 A.M.
Weather: Thin broken cirrus, few cumulus S-W-N
Temperature: 85F; Dew Point: 69F; Relative Humidity: 60%
Wind: S @ 7 kts
Sea-level pressure: 1014.0 mb; 29.94 in. Hg: steady, then falling
Visibility: 15 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E250 -BKN 15 140/85/69/1907/994/ HAZY/ 8/201 58004

1 P.M.
Weather: Broken cirrostratus, thin broken cirrus, few cumulus all
quadrants
Temperature: 85F; Dew Point: 66F; Relative Humidity: 53%
Wind: SSW @ 13G24 kts
Sea-level pressure: 1012.5mb; 29.90 in. Hg: falling, then more rapidly
Visibility: 20 miles, hazy
6-hr Max temp: 88F
6-hr Min temp: 74F
6-hr Precip: 0.00 inches
BHO SA 1755 E200 BKN 250 -BKN 20 125/85/66/2013G24/990/
FEW CU ALQDS HAZY/ 8/208 58015 10088 20074

————————————————————–

SUMMARY FOR WEDNESDAY, JULY 12, 2023

TEMPERATURE (DEGREES F)
MAX…….91   NORMAL…..82
MIN…….70   NORMAL…..64
MEAN……81   NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+8
TOTAL DEPARTURE FOR THE MONTH…………………+25 [+1.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………….0  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE SEASON……………0  DEPARTURE……..-3
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE………0

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY……………16  DEPARTURE……..+8
TOTAL COOLING UNITS FOR THE MONTH…………..111  DEPARTURE…….+22
TOTAL COOLING UNITS FOR THE SEASON………….239  DEPARTURE…….+11
TOTAL COOLING UNITS LAST SEASON TO DATE……..248  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)……….E21 WSW   @  03:16 P.M.
VECTOR #1 (1-Sec)……….22 SSW   @  03:48 P.M.
VECTOR #2 (1-Sec)……….21 SSW   @  03:48 P.M.
DAVIS #1……………….21 SSE   @  03:48 P.M.
DAVIS #2 ………………22 S     @  05:21 P.M.
RMY #1 (Instantaneous)…..20 SSW   @  03:48 P.M.
RMY #2 (Instantaneous)…..21 SSW   @  03:48 P.M.
MERLIN…………………19 S
RICHARDS (C5C) (Inst)……20       @  03:48 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………13 SSW @  05:04 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14     @  04:55 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15     @  03:53 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………14 S   @  04:56 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 S   @  04:55 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 SSW @  04:55 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 SSW @  03:53 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14     @  04:55 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………..7.6 WSW [182 total miles] VECTOR #1…………………8.0
VECTOR #2…………………8.3
DAVIS #1………………….7.7 WSW
DAVIS #2………………….7.9 WSW
RMY #1……………………7.8 WSW
RMY #2……………………8.3 WSW
RICHARDS (C5C)…………….8.2

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.12
TOTAL PRECIPITATION FOR THE MONTH…………..2.23 DEPARTURE…..+0.90
TOTAL PRECIPITATION FOR THE YEAR…………..27.41 DEPARTURE…..-1.15

————————————————————–

PRELIMINARY CLIMATE SUMMARY FOR JULY 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

7/1   80/61/71/0/0.00/567/62              17 SSE  VEC1 16 SSE RMY 17
7/2   74/63/69/-2/0.34/027/03             35 S    VEC1 35 S   RMY 35
7/3   79/63/72/-1/0.40/265/29             18 NNW  VEC1 18 NNW RMY 17 TSTM
7/4   71/65/68/-4/0.81/000/00             17 NE   VEC1 18 NE  RMY 17 TSTM
7/5   88/66/77/+5/0.00/720/79             17 S    VEC1 16 SE  RMY 15
7/6   92/69/81/+9/0.00/683/75             23 SSW  VEC1 22 SSW RMY 23
7/7   87/70/78/+6/0.00/763/84             23 SW   VEC1 22 SW  RMY 23
7/8   84/70/77/+5/0.00/463/51             20 W    VEC1 20 W   RMY 19
7/9   81/69/75/+2/T/200/22                17 ESE  VEC1 18 E   RMY 17
7/10  71/66/69/-4/0.68/000/00             22 ESE  VEC1 21 ESE RMY 22
7/11  85/62/74/+1/0.00/796/88             24 WNW  VEC1 25 WNW RMY 25
7/12  91/70/81/+8/0.00/…/..             21 WSW  VEC1 22 SSW RMY 20

7/13 The low since midnight is 70, the daily normal low is 64F

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

RECORDS FOR JULY 13
HIGH 95F IN 1894
LOW 52F IN 1888, 1939, 1973
PRECIP 3.54 INS IN 1996
WIND 55 MPH SE IN 1996

RECORDS FOR JULY 14
HIGH 98F IN 1952
LOW 51F IN 1895, 1937
PRECIP 2.28 INS IN 1948
WIND 110e MPH NW IN 1942 [THUNDERSTORM GUST; RECORD FOR MONTH]

TODAY’S REPORT PREPARED BY: Matt Douglas

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

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Effective January 1, 2025 · Milton, Massachusetts · bluehill.org
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