Sunday, September 17, 2023

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

SUNDAY, SEPTEMBER 17, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0526E
SUNSET:  1751E

SPECTACULAR MID-SEPTEMBER WEATHER TODAY IN THE WAKE OF LEE….

Extra-tropical storm Lee passed a couple of hundred miles to the east
of the region yesterday. It brought some gusty winds and generally
light rainfall amounts to Blue Hill. The peak wind gust for the
event was 44mph WNW occurring at 1:13 P.M. yesterday afternoon. Total
rainfall for the event was only 0.21″.

Conditions today are much improved over yesterday with mainly sunny
skies, comfortable humidity levels, and mild temperatures. The
temperature has reached the mid 70s early this afternoon, with the
dew point generally in the 50s. All in all it’s a beautiful day for
outdoor activities.

The wind has been gradually decreasing as the day progresses. The
average speed for the day so far is around 12mph.

Visibility has been decent today with views holding at 60 miles all
day.

The maximum temperature so far today has been 75F, which is
3 degrees above to the normal high of 72F. The minimum temperature
since midnight is 53F, which is 2 degrees below the normal low
of 55F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Clear, few cirrus distant NNW-N
Temperature: 55F; Dew Point: 49F; Relative Humidity: 80%
Wind: W @ 11 kts
Sea-level pressure: 1013.1 mb; 29.92 in. Hg: rising, then more rapidly
Visibility: 60 miles
6-hr Max temp: 57F
6-hr Min temp: 53F
24-hr Precip: 0.04 inches
BHO SA 1155 CLR 60 131/55/49/2711/992/ FEW CI DSNT NNW-N/
8/001 53019 70004 10057 20053

10 A.M.
Weather: Clear, few cirrus distant WSW-NW
Temperature: 68F; Dew Point: 54F; Relative Humidity: 61%
Wind: W @ 9 kts
Sea-level pressure: 1012.8 mb; 29.91 in. Hg: rising, then falling
Visibility: 60 miles
3-hr Precip: 0.00 inches
BHO SA 1455 CLR 60 128/68/54/2809/991/ FEW CI DSNT WSW-NW/ 8/001 50003

1 P.M.
Weather: Clear, few cirrus all quadrants
Temperature: 74F; Dew Point: 54F; Relative Humidity: 49%
Wind: W @ 10G16 kts
Sea-level pressure: 1012.3 mb; 29.89 in. Hg: falling, then more rapidly
Visibility: 60 miles
6-hr Max temp: 75F
6-hr Min temp: 55F
6-hr Precip: 0.00 inches
BHO SA 1755 CLR 60 123/74/54/2610G16/989/ FEW CI ALQDS/ 8/001 58005
10075 20055

————————————————————–

SUMMARY FOR SATURDAY, SEPTEMBER 16, 2023

TEMPERATURE (DEGREES F)
MAX…….68   NORMAL…..73
MIN…….54   NORMAL…..56
MEAN……61   NORMAL…..64

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-3
TOTAL DEPARTURE FOR THE MONTH…………………+80 [+4.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….4  DEPARTURE……..+1
TOTAL HEATING UNITS FOR THE MONTH……………11  DEPARTURE…….-17
TOTAL HEATING UNITS FOR THE SEASON…………..12  DEPARTURE…….-34
TOTAL HEATING UNITS LAST SEASON TO DATE………17  DEPARTURE……..-5

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-2
TOTAL COOLING UNITS FOR THE MONTH…………..119  DEPARTURE…….+63
TOTAL COOLING UNITS FOR THE SEASON………….689  DEPARTURE…….+34
TOTAL COOLING UNITS LAST SEASON TO DATE……..880  DEPARTURE……-191

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)……….E44 WNW  @  01:13 P.M.
VECTOR #1 (1-Sec)……….44 WNW  @  01:13 P.M.
VECTOR #2 (1-Sec)……….47 WNW  @  01:13 P.M.
DAVIS #1……………….43 W    @  01:13 P.M.
DAVIS #2 ………………44 WNW  @  01:13 P.M.
RMY #1 (Instantaneous)…..47 WNW  @  01:13 P.M.
RMY #2 (Instantaneous)…..48 NW   @  09:43 A.M.
MERLIN…………………40 NW
RICHARDS (C5C) (Inst)……47      @  01:13 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………30 WNW  @  01:14 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..27      @  01:14 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..30      @  01:14 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………31 WNW  @  10:40 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………29 NW   @  01:14 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..26 WNW  @  01:14 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..29 WNW  @  01:14 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………27      @  01:14 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..17.9 NW [430 total miles] VECTOR #1………………16.7
VECTOR #2………………19.3
DAVIS #1……………….17.5 NW
DAVIS #2……………….18.8 NW
RMY #1…………………16.2 NW
RMY #2…………………18.7 NW
RICHARDS (C5C)………….17.1

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.04 DEPARTURE…..-0.10
TOTAL PRECIPITATION FOR THE MONTH…………..3.51 DEPARTURE…..+1.54
TOTAL PRECIPITATION FOR THE YEAR…………..43.96 DEPARTURE…..+7.38

————————————————————–

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   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/+15/0.00/726/94            20 SSW VEC1 21 SSW RMY 21
9/8   86/70/78/+11/0.00/293/38            30 SSW VEC1 31 SSW RMY 32 TSTM
9/9   86/68/77/+10/0.49/291/38            30 S   VEC1 31 S   RMY 29 TSTM
9/10  78/67/73/+7/0.25/008/01             17 NE  VEC1 17 NE  RMY 15 TSTM
9/11  74/67/71/+5/0.64/023/03             15 E   VEC1 15 E   RMY 14 TSTM
9/12  79/65/72/+6/T/250/33                18 E   VEC1 17 E   RMY 18
9/13  76/64/70/+5/1.92/242/32             35 SSW VEC1 35 SSW RMY 36 TSTM
9/14  75/57/66/+1/0.00/670/89             24 NW  VEC1 24 NW  RMY 24
9/15  66/53/60/-5/0.00/465/62             36 N   VEC1 35 N   RMY 35
9/16  68/54/61/-3/0.21/022/03             44 WNW VEC1 44 WNW RMY 47

9/17 The low since midnight is 53F, the daily normal low is 55F

————————————————————–

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

————————————————————–

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated)

RECORDS FOR SEPTEMBER 17
HIGH 87F IN 2015
LOW 38F IN 1959
PRECIP 2.73 INCHES IN 1933
PEAK GUST 60 MPH WNW IN 1999

RECORDS FOR SEPTEMBER 18
HIGH 88F IN 1906
LOW 36F IN 1919
PRECIP 4.25 INCHES IN 1996
PEAK GUST 77e MPH WNW IN 1948

TODAY’S REPORT PREPARED BY: Matt Douglas