Tuesday, July 18, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
TUESDAY, JULY 18, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0423E
SUNSET: 1917E
MORE CLOUDS THAN SUN TODAY, BUT STILL WARM AND QUITE HUMID…
Early morning fog burned off, but a lot of low level cloud
cover remained through the morning hours. As we got into
the early afternoon, the lower clouds mainly dissipated, save
for a few cumulus, but mid and upper level clouds remained,
keeping any meaningful sunshine at bay. Haziness from the
wildfire smoke continued to reduce visibility after the fog
burned off, with views of generally around 10 miles late this
morning, however conditions have started to improve this
afternoon as the visibility has increased to around 20 miles.
Temperatures have warmed into the low to mid 80s despite the
abundance of cloud cover. With the dew point in the low 70s,
it feels rather stuffy outside.
The wind was generally light this morning, but has picked up
some this afternoon. The average speed for the day so far is
around 10mph, partly indicative of the increasing wind the
last few hours. The peak gust so far is around 23mph, occurring
just after 2pm!
The maximum temperature so far today is 84F, this is 2 degrees
above the normal high of 82F. The minimum temperature today is
70F, this is 6 degrees above the normal low of 64F.
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Today’s Observations:
7 A.M.
Weather: Overcast stratus
Temperature: 71F; Dew Point: 70F; Relative Humidity: 95%
Wind: SSW @ 7 kts
Sea-level pressure: 1016.3 mb; 30.01 in. Hg: falling, then rising
Visibility: 5 miles, fog
6-hr Max temp: 71F
6-hr Min temp: 70F
24-hr Precip: 0.00 inches
BHO SA 1155 E2 OVC 5F 163/71/70/2007/001/ 8/6// 53003 10071 20070
10 A.M.
Weather: Broken stratocumulus, broken altocumulus, broken cirrus
Temperature: 75F; Dew Point: 71F; Relative Humidity: 85%
Wind: SSW @ 7 kts
Sea-level pressure: 1016.5 mb; 30.02 in. Hg: rising, then falling
Visibility: 10 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E10 BKN 140 BKN 250 BKN 10 165/75/71/2007/002/ HAZY/
8/552 50002
1 P.M.
Weather: Broken altocumulus, broken cirrus, few cumulus all quadrants
Temperature: 81F; Dew Point: 70F; Relative Humidity: 71%
Wind: S @ 10G19 kts
Sea-level pressure: 1015.2mb; 29.98 in. Hg: falling, then more slowly
Visibility: 20 miles, hazy
6-hr Max temp: 84F
6-hr Min temp: 71F
6-hr Precip: 0.00 inches
BHO SA 1755 E140 BKN 250 BKN 20 152/81/70/1810G19/998/ FEW CU ALQDS
HAZY/ 8/252 56013 10084 20071
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SUMMARY FOR MONDAY, JULY 17, 2023
TEMPERATURE (DEGREES F)
MAX…….86 NORMAL…..82
MIN…….71 NORMAL…..64
MEAN……79 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+6
TOTAL DEPARTURE FOR THE MONTH…………………+41 [+2.2 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……..-4
TOTAL HEATING UNITS FOR THE SEASON……………0 DEPARTURE……..-4
TOTAL HEATING UNITS LAST SEASON TO DATE……….0 DEPARTURE………0
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY……………14 DEPARTURE……..+6
TOTAL COOLING UNITS FOR THE MONTH…………..167 DEPARTURE…….+37
TOTAL COOLING UNITS FOR THE SEASON………….295 DEPARTURE…….+26
TOTAL COOLING UNITS LAST SEASON TO DATE……..300 DEPARTURE……..-5
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 @ 03:05 P.M.
VECTOR #1 (1-Sec)……….21 W @ 03:02 P.M.
VECTOR #2 (1-Sec)……….21 WSW @ 03:05 P.M.
DAVIS #1……………….21 SW @ 03:01 P.M.
DAVIS #2 ………………21 SSE @ 06:46 P.M.
RMY #1 (Instantaneous)…..23 WSW @ 03:05 P.M.
RMY #2 (Instantaneous)…..21 WSW @ 03:05 P.M.
MERLIN…………………20 W
RICHARDS (C5C) (Inst)……22 @ 03:05 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 WSW @ 03:05 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..15 @ 03:06 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15 @ 03:06 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 WSW @ 03:07 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 WSW @ 03:06 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..15 WSW @ 03:06 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 WSW @ 03:06 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………15 @ 03:06 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………..8.0 SW [193 total miles]
VECTOR #1…………………8.4
VECTOR #2…………………8.7
DAVIS #1………………….8.0 SW
DAVIS #2………………….8.1 WSW
RMY #1……………………8.3 WSW
RMY #2……………………8.7 WSW
RICHARDS (C5C)…………….8.3
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH…………..5.10 DEPARTURE…..+3.20
TOTAL PRECIPITATION FOR THE YEAR…………..30.28 DEPARTURE…..+1.15
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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 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 88/67/78/+5/0.13/…/.. 35 SSW VEC1 35 SSW RMY 38 TSTM
7/14 78/65/72/-1/0.18/…/.. 29 SSW VEC1 32 SSW RMY 32 TSTM
7/15 86/70/78/+5/T/…/.. 28 SSW VEC1 30 SSW RMY 29 TSTM
7/16 76/71/74/+1/2.56/…/.. 40 S VEC1 41 SSW RMY 48 TSTM
7/17 86/71/79/+6/0.00/…/.. 21 WSW VEC1 21 W RMY 23
7/18 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 18
HIGH 96F IN 1991, 1999
LOW 54F IN 1892, 1956, 1971
PRECIP 1.65 INS IN 2000
WIND 43e MPH SW IN 1949
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
TODAY’S REPORT PREPARED BY: Matt Douglas
