Friday, July 19, 2024
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
FRIDAY, JULY 19, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0425E
SUNSET: 1916E
HUMIDITY FINALLY MOVES OUT, SUNSHINE AND LOWER TEMPS REMAIN
ON BLUE HILL TODAY….
After a very muggy and uncomfortable week, the dew points have
fallen to the upper 50’s making the outdoors fun and safe to
be out again! The skies have been mostly clear today with an
increasing cumulus coverage by the final observation. Plenty
of sunshine and low humidity has made it a beautiful day for
anything outside.
Temperatures were below 70F this morning and warmed to the upper
70’s by the afternoon. We have not yet reached the normal of
82F yet, but it’s still possible with plenty of sunshine left
in the day. The low temperature was even slightly below average
which is a pleasant welcome after the heat we have endured this
week.
The wind has been fairly light with an average of just under
9 mph. Winds have been mostly from the NNW-NW, bringing the
cooler air to our region. By this afternoon the winds have
dropped even lower and became variable but still out of the
NW and WNW directions. The peak gust for the day so far is
24 mph and occurred just before 2am.
Visibility has been splendid with 60 mile views for the day.
The last date we had visibility above 50 miles was back on the
7th of July! With the dry air and lack of hazy conditions we
should continue to have good visibility.
The maximum temperature so far today is 79F, which is 3 degrees
below the normal high of 82F. The minimum temperature since
midnight is 61F, which is 3 degrees below the normal low of 64F.
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Today’s Observations:
7 A.M.
Weather: Clear, few altocumulus NE-S-SSW
Temperature: 67F; Dew Point: 57F; Relative Humidity: 70%
Wind: NW @ 8 kts
Sea-level pressure: 1018.7 mb; 30.08 in. Hg: rising, then
more rapidly
Visibility: 60 miles
6-hr Max temp: 67F
6-hr Min temp: 61F
24-hr Precip: 0.00 inches
BHO SA 1155 CLR 60 187/67/57/3308/008/ FEW AC NE-S-SSW/
8/030 53021 10067 20061
10 A.M.
Weather: Clear, few cumulus WSW-W-NNE, few altocumulus
E-SSE
Temperature: 74F; Dew Point: 56F; Relative Humidity: 52%
Wind: NW @ 7 kts
Sea-level pressure: 1019.2 mb; 30.10 in. Hg: rising steadily
Visibility: 60 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 60 192/74/56/3007/010/ FEW CU WSW-W-NNE
FEW AC E-SSE/ 8/130 52005
1 P.M.
Weather: Clear, few cumulus all quadrants, few cirrus
NNE-ESE
Temperature: 78F; Dew Point: 56F; Relative Humidity: 46%
Wind: WNW @ 5 kts, wind light and variable
Sea-level pressure: 1019.1 mb; 30.09 in. Hg: falling,
then steady
Visibility: 60 miles
6-hr Max temp: 78F
6-hr Min temp: 67F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 60 191/78/56/2805/009/ FEW CU ALQDS FEW CI
NNE-ESE WND L/V/ 8/101 58001 10079 20067
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SUMMARY FOR THURSDAY, JULY 18, 2024
TEMPERATURE (DEGREES F)
MAX…….85 NORMAL…..82
MIN…….68 NORMAL…..64
MEAN……77 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+4
TOTAL DEPARTURE FOR THE MONTH…………………….+85 [+4.5 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH…………….0 DEPARTURE……..-5
TOTAL HEATING UNITS FOR THE SEASON……………0 DEPARTURE……..-5
TOTAL HEATING UNITS LAST SEASON TO DATE……….0 DEPARTURE………0
COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY……………12 DEPARTURE……..+4
TOTAL COOLING UNITS FOR THE MONTH…………..219 DEPARTURE…….+80
TOTAL COOLING UNITS FOR THE SEASON………….397 DEPARTURE……+119
TOTAL COOLING UNITS LAST SEASON TO DATE……..307 DEPARTURE…….+90
PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all on Main Tower.
E=Estimated
F420C (Official)……….E37 W @ 12:02 A.M.
VECTOR #1 (1-Sec)……….37 W @ 12:02 A.M.
VECTOR #2 (1-Sec)……….35 W @ 12:01 A.M.
DAVIS #1……………….37 W @ 12:02 A.M.
DAVIS #2 ………………34 WNW @ 12:02 A.M.
RMY #1 (Instantaneous)…..38 W @ 12:02 A.M.
RMY #2 (Instantaneous)…..35 W @ 12:02 A.M.
MERLIN…………………22 NW
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………26 W @ 12:01 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..27 @ 12:01 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..25 @ 12:02 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………28 W @ 12:01 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………26 W @ 12:01 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..26 W @ 12:01 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..25 W @ 12:02 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL…….9.1 WNW [219 total miles]
VECTOR #1……………..9.4
VECTOR #2…………….10.0
DAVIS #1………………9.6 W
DAVIS #2………………9.9 WNW
RMY #1………………..9.1 W
RMY #2………………..9.9 W
RICHARDS (C5C)…………OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….TRACE DEPARTURE…..-0.10
TOTAL PRECIPITATION FOR THE MONTH…………..2.12 DEPARTURE…..+0.12
TOTAL PRECIPITATION FOR THE YEAR (2024)…….37.80 DEPARTURE…..+8.57
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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 77/63/70/-1/0.07/722/79 29 N VEC1 27 N RMY 28 TSTM
7/2 80/60/70/-1/0.00/886/97 20 N VEC1 20 N RMY 19
7/3 84/62/73/+1/0.00/856/94 25 S VEC1 25 S RMY 26
7/4 85/62/74/+2/0.04/392/43 28 SSW VEC1 28 SSW RMY 28
7/5 84/68/76/+4/0.22/146/16 29 SSW VEC1 29 SSW RMY 29
7/6 77/71/74/+2/0.10/009/01 31 SW VEC1 33 SSW RMY 33
7/7 88/72/80/+8/0.00/345/38 15 SW VEC1 15 SW RMY 14
7/8 91/71/81/+9/0.00/780/86 17 NW VEC1 18 NW RMY 18
7/9 88/72/80/+7/T/534/59 26 SSW VEC1 27 SSW RMY 29
7/10 88/72/80/+7/0.00/552/61 38 SSW VEC1 37 SSW RMY 38
7/11 87/71/79/+6/0.01/470/52 41 SSW VEC1 40 SSW RMY 41
7/12 85/69/77/+4/0.05/…/.. 32 SW VEC1 32 SW RMY 32
7/13 80/72/76/+3/0.64/…/.. 28 SW VEC1 25 SW RMY 26
7/14 88/69/79/+6/0.00/…/.. 18 SW VEC1 18 SW RMY 19
7/15 92/70/81/+8/0.07/…/.. 28 WSW VEC1 27 WSW RMY 28 TSTM
7/16 92/72/82/+9/T/…/.. 33 SW VEC1 34 SW RMY 34
7/17 89/71/80/+7/0.37/…/.. 38 W VEC1 36 W RMY 37 TSTM
7/18 85/68/77/+4/0.55/…/.. 37 W VEC1 37 W RMY 38 TSTM
7/19 The low since midnight is 61F, the daily normal low is 64F.
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JULY DAILY RECORDS TO DATE
NONE.
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR JULY 19
HIGH 96F IN 1977, 1991
LOW 50F IN 1890
PRECIP 1.10 INS IN 1951
WIND 63 MPH SSW IN 1982
RECORDS FOR JULY 20
HIGH 99F IN 1991
LOW 47F IN 1890
PRECIP 1.64 INS IN 1938
WIND 56e MPH SSW IN 1943
TODAY’S REPORT PREPARED BY: Amanda Joly
