Monday, July 17, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
MONDAY, JULY 17, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0422E
SUNSET: 1918E
SUNSHINE THROUGH HAZY SKIES FOLLOWING HEAVY RAIN YESTERDAY;
VERY WARM AND HUMID TODAY AT BLUE HILL…
Yesterday’s stormy weather brought a heavy slug of rainfall to
the hill. 2.56″ storm total fell here on the hill, all of it
occurring on the calendar day yesterday. This pushes our monthly
total to over 5 inches, with still 2 weeks left before July is
over.
Sunshine has been the theme today after some early morning fog
burned off. Haziness increased late this morning and this
afternoon as Canadian wildfire smoke makes another visit to the
region today. As a matter of fact, the visibility has dropped
from 30 miles early this morning to only 9 miles at the 1pm
observation, all of this under clear (cloud-wise) skies.
Temperatures have warmed well into the 80s today with continued
high dew points in the upper 60s to low 70s.
The wind has been generally light today after gusty conditions
yesterday. The average speed for today has been around 8mph so
far. The peak gust occurred just after 2am at around 18mph.
The maximum temperature so far today is 86F, this is 4 degrees
above the normal high of 82F. The minimum temperature today is
71F, this is 7 degrees above the normal low of 64F.
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Today’s Observations:
7 A.M.
Weather: Scattered stratus fractus, scattered altocumulus
Temperature: 73F; Dew Point: 73F; Relative Humidity: 100%
Wind: WSW @ 5 kts, wind light
Sea-level pressure: 1013.1 mb; 29.92 in. Hg: rising, then more slowly
Visibility: 30 miles, thin fog
6-hr Max temp: 73F
6-hr Min temp: 71F
24-hr Precip: 2.33 inches
BHO SA 1155 6 SCT 120 SCT 30 131/73/73/2505/992/ THN F ALQDS
WND LGT/ 8/750 51012 70233 10073 20071
10 A.M.
Weather: Clear, smoke layer all quadrants
Temperature: 79F; Dew Point: 68F; Relative Humidity: 69%
Wind: WNW @ 4 kts, wind light and variable
Sea-level pressure: 1014.3 mb; 29.95 in. Hg: rising unsteadily
Visibility: 10 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 10 143/79/68/2904/995/ K LYR ALQDS HAZY WND L/V/
8/000 52012
1 P.M.
Weather: Clear, smoke layer all quadrants
Temperature: 85F; Dew Point: 67F; Relative Humidity: 55%
Wind: W @ 6 kts, wind light
Sea-level pressure: 1014.3mb; 29.95 in. Hg: falling, then rising
Visibility: 9 miles, hazy
6-hr Max temp: 85F
6-hr Min temp: 73F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 9 143/85/67/2706/995/ K LYR ALQDS HAZY WND LGT/
8/000 55000 10085 20073
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SUMMARY FOR SUNDAY, JULY 16, 2023
TEMPERATURE (DEGREES F)
MAX…….76 NORMAL…..82
MIN…….71 NORMAL…..64
MEAN……74 NORMAL…..73
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+1
TOTAL DEPARTURE FOR THE MONTH…………………+35 [+2.0 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…………….9 DEPARTURE……..+1
TOTAL COOLING UNITS FOR THE MONTH…………..153 DEPARTURE…….+31
TOTAL COOLING UNITS FOR THE SEASON………….281 DEPARTURE…….+20
TOTAL COOLING UNITS LAST SEASON TO DATE……..288 DEPARTURE……..-7
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)……….E40 S @ 10:04 A.M.
VECTOR #1 (1-Sec)……….41 SSW @ 10:40 A.M.
VECTOR #2 (1-Sec)……….44 S @ 10:04 A.M.
DAVIS #1……………….42 S @ 10:01 A.M.
DAVIS #2 ………………45 S @ 09:47 A.M.
RMY #1 (Instantaneous)…..48 S @ 09:19 A.M.
RMY #2 (Instantaneous)…..48 S @ 10:04 A.M.
MERLIN…………………38 S
RICHARDS (C5C) (Inst)……41 @ 09:19 A.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………28 S @ 10:04 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..27 @ 10:03 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..28 @ 10:03 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………26 S @ 10:37 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………32 S @ 10:01 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..26 S @ 10:03 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..29 S @ 10:01 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………26 @ 10:03 A.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………..15.1 S [362 total miles]
VECTOR #1…………………14.9
VECTOR #2…………………16.2
DAVIS #1………………….13.3
DAVIS #2………………….16.4
RMY #1……………………14.5 S
RMY #2……………………16.4 SSW
RICHARDS (C5C)…………….14.5
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..2.33 DEPARTURE…..+2.22
TOTAL PRECIPITATION FOR THE MONTH…………..5.10 DEPARTURE…..+3.31
TOTAL PRECIPITATION FOR THE YEAR…………..30.28 DEPARTURE…..+1.26
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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
7/15 76/71/74/+1/2.56/…/.. 40 S VEC1 41 SSW RMY 48 TSTM
7/16 The low since midnight is 71, 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 17
HIGH 96F IN 1999
LOW 47F IN 1892
PRECIP 1.39 INS IN 1989
WIND 46 MPH WNW IN 1971
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
TODAY’S REPORT PREPARED BY: Matt Douglas
