Thursday, September 19, 2024
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
THURSDAY, SEPTEMBER 19, 2024
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0529E
SUNSET: 1746E
FINALLY A CHANGE, OVERCAST WITH PERIODS OF LIGHT RAIN AND DRIZZLE…
What’s this strange wet stuff falling from the sky today? Finally
we’re seeing some measurable rainfall today after going 11 days
with not even a trace. As a matter of fact, today is only the 3rd
day to receive measurable rainfall since August 20th! So far 0.10″
of rain has fallen since it began just before 8am this morning.
Temperatures are being held down by the clouds and rainfall.
Readings have only made it to the mid 60s so far today. With the
air being saturated, the dew point is also in the mid 60s, so it
does feel quite humid out there, especially when compared to
earlier in the week when the dew point was as low as the 30s!
The wind has been gradually increasing through the morning hours
with an average speed for the day thus far of around 11mph. It has
been gusty with frequent gusts over 20mph. The peak gust so far
for the day is 27mph, which occurred right around 11am this
morning.
Visibility was around 30 miles early this morning, but dropped
markedly by mid morning as the low clouds pushed across the summit.
The view during that time was a 1/4 mile or less. The clouds have
lifted by the 1pm observation, thus the visibility has improved,
up to 20 miles off to the NW-NE, but still as low as 7 miles to
the ESE-S and WSW-WNW.
The maximum temperature so far today is 66F, which is 6 degrees
below the normal high of 72F. The minimum temperature since midnight
is 60F, which is 5 degrees above the normal low of 55F.
————————————————————–
Today’s Observations:
7 A.M.
Weather: Scattered stratocumulus, scattered altocumulus/castellanus,
broken cirrus, few lower stratus fractus distant N-E-SSE
Temperature: 62F; Dew Point: 59F; Relative Humidity: 92%
Wind: NE @ 10G17 kts
Sea-level pressure: 1014.4 mb; 29.96 in. Hg: falling, then rising
Visibility: 30 miles, 15 miles E-ESE, thin fog
6-hr Max temp: 63F
6-hr Min temp: 60F
24-hr Precip: 0.00 inches
BHO SA 1155 55 SCT 80 SCT E250 BKN 30 144/62/59/0410G17/996/
FEW LWR STFRA DSNT N-E-SSE THN F ALQDS VSBY 15 E-ESE/ 8/584
55000 10063 20060
10 A.M.
Weather: Sky obscured, vertical visibility 200ft, light drizzle
Temperature: 64F; Dew Point: 64F; Relative Humidity: 100%
Wind: NNE @ 10G20 kts
Sea-level pressure: 1014.0 mb; 29.94 in. Hg: rising, then falling
Visibility: 1/4 mile, fog
3-hr Precip: 0.07 inches
BHO SA 1455 X W2 1/4L-F 140/64/64/0310G20/994/ R-E29 L-B29 SUN DMLY
VSBL/ 8//// 58004 6007/
1 P.M.
Weather: Overcast stratus, very light drizzle
Temperature: 66F; Dew Point: 65F; Relative Humidity: 96%
Wind: NNE @ 10G18 kts
Sea-level pressure: 1013.2 mb; 29.92 in. Hg: falling, then more rapidly
Visibility: 10 miles, 7 miles ESE-S and WSW-WNW, 20 miles NW-NE
6-hr Max temp: 66F
6-hr Min temp: 62F
6-hr Precip: 0.10 inches
BHO SA 1755 E3 OVC 10L- 132/66/65/0310G18/992/ THN F ALQDS PCPN VRY LGT
L-B08 VSBY 7 ESE-S AND WSW-WNW 20 NW-NE/ 8/6// 58008 6010/ 10066 20062
————————————————————–
SUMMARY FOR WEDNESDAY, SEPTEMBER 18, 2024
TEMPERATURE (DEGREES F)
MAX…….77 NORMAL…..72
MIN…….60 NORMAL…..55
MEAN……69 NORMAL…..63
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL…………..+6
TOTAL DEPARTURE FOR THE MONTH…………………….+24 [+1.1 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2024 THRU JUN 2025)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH……………10 DEPARTURE…….-25
TOTAL HEATING UNITS FOR THE SEASON…………..21 DEPARTURE…….-32
TOTAL HEATING UNITS LAST SEASON TO DATE………15 DEPARTURE……..+6
COOLING DEGREE DAYS (SEASON: JAN 2024 THRU DEC 2024)
TOTAL COOLING UNITS FOR YESTERDAY…………….4 DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE MONTH……………59 DEPARTURE……..-1
TOTAL COOLING UNITS FOR THE SEASON………….753 DEPARTURE…….+98
TOTAL COOLING UNITS LAST SEASON TO DATE……..689 DEPARTURE…….+64
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)……….E15 W @ 01:40 A.M.
VECTOR #1 (1-Sec)……….14 W @ 01:36 A.M.
VECTOR #2 (1-Sec)……….13 WSW @ 01:19 A.M.
DAVIS #1……………….13 SW @ 12:11 A.M.
DAVIS #2 ………………13 WSW @ 12:12 A.M.
RMY #1 (Instantaneous)…..14 W @ 01:32 A.M.
RMY #2 (Instantaneous)…..13 WSW @ 01:08 A.M.
MERLIN………………….M
RICHARDS (C5C) (Inst)…..OTS
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………12 SW @ 12:36 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..11 @ 12:07 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..11 @ 12:12 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………11 SW @ 12:08 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………11 WSW @ 12:11 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..11 WSW @ 12:07 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..11 SW @ 12:12 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE……..OTS
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..4.7 ESE [113 total miles]
VECTOR #1………………5.6
VECTOR #2………………5.8
DAVIS #1……………….5.4 SE
DAVIS #2……………….5.4 SE
RMY #1…………………5.6 ESE
RMY #2…………………5.7 E
RICHARDS (C5C)………….OTS
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.14
TOTAL PRECIPITATION FOR THE MONTH…………..0.04 DEPARTURE…..-2.22
TOTAL PRECIPITATION FOR THE YEAR (2024)…….41.25 DEPARTURE…..+4.38
————————————————————–
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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
9/1 82/67/75/+6/T/244/31 28 SSW VEC1 27 SW RMY 28
9/2 79/56/68/-1/0.00/644/82 31 NNW VEC1 31 NNW RMY 32
9/3 74/49/62/-6/0.00/766/98 23 NW VEC1 23 NNW RMY 23
9/4 80/56/68/0/0.00/732/94 18 ESE VEC1 19 SE RMY 18
9/5 77/58/68/0/0.00/737/95 20 ESE VEC1 19 ESE RMY 19
9/6 73/58/66/-2/0.00/240/31 22 E VEC1 21 ENE RMY 23
9/7 77/56/67/0/0.04/301/39 34 WNW VEC1 31 WNW RMY 33
9/8 70/50/60/-7/0.00/753/98 35 W VEC1 35 W RMY 34
9/9 75/51/63/-4/0.00/727/95 31 WNW VEC1 28 WNW RMY 30
9/10 78/56/67/+1/0.00/717/94 21 NW VEC1 20 SW RMY 21
9/11 78/53/66/0/0.00/714/94 20 S VEC1 19 S RMY 18
9/12 82/58/70/+4/0.00/711/94 20 S VEC1 19 S RMY 20
9/13 85/59/72/+7/0.00/595/79 21 SSW VEC1 20 SSW RMY 20
9/14 81/61/71/+6/0.00/691/92 21 ENE VEC1 20 ENE RMY 21
9/15 78/60/69/+4/0.00/598/80 23 SE VEC1 23 SE RMY 25
9/16 83/55/69/+5/0.00/700/94 22 SSW VEC1 21 SSW RMY 21
9/17 83/55/69/+5/0.00/453/61 16 SW VEC1 14 S RMY 15
9/18 77/60/69/+6/0.00/163/22 15 W VEC1 14 W RMY 14
9/19 The low since midnight is 60F, the daily normal low is 55F.
————————————————————–
SEPTEMBER DAILY RECORDS TO DATE
NONE.
————————————————————–
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR SEPTEMBER 19
HIGH 87F IN 1906,1983
LOW 37F IN 1929
PRECIP 3.69 INCHES IN 1936
PEAK GUST 55 MPH S IN 2012
RECORDS FOR SEPTEMBER 20
HIGH 90 IN 1983
LOW 34 IN 1979
PRECIP 4.57 INS IN 1899
PEAK GUST 44 MPH NE IN 1972
TODAY’S REPORT PREPARED BY: Matt Douglas
