Saturday, September 9, 2023
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
SATURDAY, SEPTEMBER 9, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0518E
SUNSET: 1805E
WARM AND VERY HUMID CONDITIONS CONTINUE AS THE LATE SUMMER
PATTERN PERSISTS….
The low temperature of 70F yesterday tied the record high minimum
for the date also established in 2015. The low temperature so far
this morning is 72F, which if it holds, will establish a new
record high minimum for today, beating the old record of 70F set
in 2015. These high overnight temperatures are quite indicative
of the very high dew points we’ve been experiencing the last
several days. For reference, the normal low for this time of year is 58F!
Clouds have dominated the sky today with a few splashes of
sunshine here and there. Despite the cloud cover, the temperature
has warmed into the mid 80s. Again, with the dew points in the low
70s, it’s another day feeling oppressive.
As a result of the warm and humid air, the atmosphere has become
unstable. That, along with some lingering boundaries from
yesterday’s storms, has sparked some thunderstorms to the east
through south of the Observatory. So far no rain has occurred
here at Blue Hill, but thunder can be heard at the 1pm observation.
Unlike yesterday, today has featured light winds, as such it’s
just adding to the stuffiness outdoors. The average speed so far
for the day is only around 9mph. The peak gust so far, which
occurred during the midnight hour, is only around 20mph.
Visibility has been limited today, but has improved from around
10 miles early this morning, to around 20-25 miles early this
afternoon.
The maximum temperature so far today has been 86F, which is
11 degrees above the normal high of 75F. The minimum temperature
since midnight is 72F, which is 14 degrees above the normal low of 58F.
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Today’s Observations:
7 A.M.
Weather: Overcast stratocumulus, few lower stratus fractus
all quadrants
Temperature: 73F; Dew Point: 72F; Relative Humidity: 95%
Wind: SSW @ 7 kts
Sea-level pressure: 1020.0 mb; 30.12 in. Hg: rising, then more slowly
Visibility: 10 miles, 20 miles ENE-SE, thin fog
6-hr Max temp: 73F
6-hr Min temp: 72F
24-hr Precip: 0.00 inches
BHO SA 1155 E15 OVC 10 200/73/72/2107/012/ FEW LWR STFRA ALQDS
THN F ALQDS VSBY 20 ENE-SE/ 8/5// 51015 10073 20072
10 A.M.
Weather: Broken cumulus, overcast stratocumulus, few lower
stratus fractus all quadrants
Temperature: 78F; Dew Point: 71F; Relative Humidity: 79%
Wind: SW @ 6 kts, wind light
Sea-level pressure: 1020.8 mb; 30.14 in. Hg: rising, then more rapidly
Visibility: 25 miles, hazy
3-hr Precip: 0.00 inches
BHO SA 1455 E22 BKN 30 OVC 25 208/78/71/2206/014/ FEW LWR STFRA ALQDS
HAZY WND LGT/ 8/8// 53008
1 P.M.
Weather: Broken cumulus, broken cumulonimbus, broken cirrus,
thin broken cirrus, thunderstorm
Temperature: 84F; Dew Point: 72F; Relative Humidity: 69%
Wind: W @ 5 kts, wind light and variable
Sea-level pressure: 1020.0 mb; 30.12 in. Hg: falling unsteadily
Visibility: 20 miles, hazy
6-hr Max temp: 86F
6-hr Min temp: 73F
6-hr Precip: 0.00 inches
BHO SA 1755 E27 BKN 40 BKN 200 BKN 250 -BKN 20T 200/84/72/2605/012/
CB ENE-S MOV NE TB55 OCNL LTGICCCCG ESE-SE VIRGA ENE-S HAZY WND L/V/
8/963 57008 10086 20073
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SUMMARY FOR FRIDAY, SEPTEMBER 8, 2023
TEMPERATURE (DEGREES F)
MAX…….86 NORMAL…..76
MIN…….70 NORMAL…..58
MEAN……78 NORMAL…..67
DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………+11
TOTAL DEPARTURE FOR THE MONTH…………………+54 [+6.6 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0 DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH…………….2 DEPARTURE……..-8
TOTAL HEATING UNITS FOR THE SEASON……………3 DEPARTURE…….-25
TOTAL HEATING UNITS LAST SEASON TO DATE……….7 DEPARTURE……..-4
COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY……………13 DEPARTURE……..+9
TOTAL COOLING UNITS FOR THE MONTH……………80 DEPARTURE…….+47
TOTAL COOLING UNITS FOR THE SEASON………….650 DEPARTURE…….+21
TOTAL COOLING UNITS LAST SEASON TO DATE……..857 DEPARTURE……-207
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)……….E30 SSW @ 04:42 P.M.
VECTOR #1 (1-Sec)……….31 SSW @ 04:42 P.M.
VECTOR #2 (1-Sec)……….32 SW @ 04:41 P.M.
DAVIS #1……………….30 S @ 05:13 P.M.
DAVIS #2 ………………32 S @ 04:09 P.M.
RMY #1 (Instantaneous)…..32 SSW @ 04:42 P.M.
RMY #2 (Instantaneous)…..33 SW @ 04:41 P.M.
MERLIN…………………29 SSW
RICHARDS (C5C) (Inst)……31 @ 04:42 P.M.
FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………23 SSW @ 05:44 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..22 @ 04:42 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..23 @ 04:42 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………22 SSW @ 04:42 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 SSW @ 04:42 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..22 SSW @ 04:42 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..23 SW @ 04:42 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………20 @ 04:43 P.M.
AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..10.0 SSW [241 total miles]
VECTOR #1………………10.3
VECTOR #2………………11.1
DAVIS #1………………..9.7 SSW
DAVIS #2……………….11.1 SSW
RMY #1…………………10.1 SSW
RMY #2…………………11.2 SSW
RICHARDS (C5C)………….10.2
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.11
TOTAL PRECIPITATION FOR THE MONTH………….TRACE DEPARTURE…..-0.94
TOTAL PRECIPITATION FOR THE YEAR…………..40.45 DEPARTURE…..+4.90
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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 73/52/63/-6/0.00/774/98 23 SSW VEC1 22 SSW RMY 21
9/2 79/56/68/-1/0.00/708/90 25 SW VEC1 24 SW RMY 26
9/3 85/61/73/+5/T/674/86 21 SW VEC1 21 SW RMY 21
9/4 85/68/77/+9/0.00/719/92 17 NW VEC1 16 NW RMY 16
9/5 86/68/77/+9/0.00/647/83 16 NNE VEC1 16 ENE RMY 16
9/6 89/70/80/+12/0.00/722/93 17 WSW VEC1 17 SSW RMY 18
9/7 92/72/82/+15/0.00/…/.. 20 SSW VEC1 21 SSW RMY 21
9/8 86/70/78/+11/0.00/…/.. 30 SSW VEC1 31 SSW RMY 32 TSTM
9/9 The low since midnight is 72F, the daily normal low is 58F
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SEPTEMBER DAILY RECORDS
09/07/2023: NEW RECORD HIGH DAILY MINIMUM TEMPERATURE OF 72F;
BEATS THE RECORD OF 70F SET IN 1999
09/07/2023: RECORD HIGH TEMPERATURE OF 92F;
TIES THE RECORD OF 92F SET IN 2007 AND 2015
09/08/2023: RECORD HIGH DAILY MINIMUM TEMPERATURE OF 70F;
TIES THE RECORD OF 70F SET IN 2015
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DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)
RECORDS FOR SEPTEMBER 9
HIGH 92F IN 2015
LOW 41F IN 1938
PRECIP 1.97 INCHES IN 1969
PEAK GUST 52 MPH WNW IN 1969, NW IN 1978
RECORDS FOR SEPTEMBER 10
HIGH 90F IN 1931,1989
LOW 41F IN 1956
PRECIP 5.60 INCHES IN 1999 (DAILY RECORD FOR SEPTEMBER)
PEAK GUST 48 MPH NW IN 1972
TODAY’S REPORT PREPARED BY: Matt Douglas
