Monday, September 18, 2023

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

MONDAY, SEPTEMBER 18, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0527E
SUNSET:  1749E

OVERCAST AND DREARY WITH MORE RAIN ACROSS THE REGION….

It should be of no surprise to anyone that it’s raining again!
Today has featured a pretty steady rain which began in the wee
hours of the morning. 0.14″ was measured by 7am, with an
additional 0.49″ falling between 7am-1pm.

Temperatures have been held in the low to mid 60s thanks to the
clouds and rainfall. The dew point of course is also in the low
60s as a slug of moist air rides up the coast associated with a
developing coastal low.

The wind has decreased in speed since earlier this morning when
it was averaging around 10-15mph. As we move into the early
afternoon hours, the speed has decreased to under 5mph.

Visibility has been quite limited, but variable, thanks to the
rain and fog. We could see up to 4-5 miles early this morning,
but has dropped to as low as 1/16th of a mile at times through
the course of the day.

The maximum temperature so far today has been 64F, which is
8 degrees below to the normal high of 72F. The minimum temperature
since midnight is 61F, which is 6 degrees above the normal low
of 55F.

————————————————————–

Today’s Observations:

7 A.M.
Weather: Scattered stratus fractus, overcast nimbostratus, light rain
few lower stratus fractus all quadrants
Temperature: 62F; Dew Point: 62F; Relative Humidity: 99%
Wind: S @ 7 kts
Sea-level pressure: 1012.8 mb; 29.91 in. Hg: falling, then rising
Visibility: 4 miles, fog
6-hr Max temp: 63F
6-hr Min temp: 61F
24-hr Precip: 0.14 inches
BHO SA 1155 27 SCT E60 OVC 4R-F 128/62/62/1807/991/ FEW LWR STFRA
ALQDS/ 8/72/ 53003 6014/ 70014 10063 20061

10 A.M.
Weather: Sky obscured, vertical visibility 100ft, light rain
Temperature: 63F; Dew Point: 63F; Relative Humidity: 100%
Wind: SE @ 10G16 kts
Sea-level pressure: 1012.0 mb; 29.88 in. Hg: falling, then rising
Visibility: 1/16 mile, fog
3-hr Precip: 0.12 inches
BHO SA 1455 X W1 1/16R-F 120/63/63/1410G16/988/ R-E02B30/
8//// 55008 6012/

1 P.M.
Weather: Sky partially obscured, broken stratus fractus,
overcast nimbostratus, light rain
Temperature: 63F; Dew Point: 63F; Relative Humidity: 100%
Wind: ESE @ 4 kts, wind light
Sea-level pressure: 1010.2 mb; 29.83 in. Hg: falling, then more slowly
Visibility: 1 mile, 1/8 mile variable 2 miles, fog
6-hr Max temp: 64F
6-hr Min temp: 62F
6-hr Precip: 0.49 inches
BHO SA 1755 -X E12 BKN 55 OVC 1VR-F 102/63/63/1204/983/ STFRA OCNLY
DRFTG OVR SMT VSBY 1/8V2 WND LGT/ 8/72/ 56018 6049/ 10064 20062

————————————————————–

SUMMARY FOR SUNDAY, SEPTEMBER 17, 2023

TEMPERATURE (DEGREES F)
MAX…….76   NORMAL…..72
MIN…….53   NORMAL…..55
MEAN……65   NORMAL…..64

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+1
TOTAL DEPARTURE FOR THE MONTH…………………+81 [+4.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH……………11  DEPARTURE…….-21
TOTAL HEATING UNITS FOR THE SEASON…………..12  DEPARTURE…….-38
TOTAL HEATING UNITS LAST SEASON TO DATE………23  DEPARTURE…….-11

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…….+61
TOTAL COOLING UNITS FOR THE SEASON………….689  DEPARTURE…….+35
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)……….E26 WNW  @  01:35 A.M.
VECTOR #1 (1-Sec)……….25 WNW  @  01:35 A.M.
VECTOR #2 (1-Sec)……….25 WNW  @  03:32 A.M.
DAVIS #1……………….26 W    @  01:35 A.M.
DAVIS #2 ………………24 WNW  @  02:36 A.M.
RMY #1 (Instantaneous)…..24 WNW  @  01:35 A.M.
RMY #2 (Instantaneous)…..25 WNW  @  03:32 A.M.
MERLIN…………………M
RICHARDS (C5C) (Inst)……26      @  01:35 A.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………19 W    @  03:53 A.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18      @  03:06 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19      @  02:41 A.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 W    @  03:03 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 WNW  @  03:03 A.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 W    @  04:39 A.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..19 WNW  @  02:41 A.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………18      @  03:03 A.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL……..11.3 WSW [271 total miles] VECTOR #1………………11.3
VECTOR #2………………11.8
DAVIS #1……………….11.6 W
DAVIS #2……………….11.7 W
RMY #1…………………10.9 W
RMY #2…………………11.6 W
RICHARDS (C5C)………….11.4

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.14 DEPARTURE…..-0.01
TOTAL PRECIPITATION FOR THE MONTH…………..3.65 DEPARTURE…..+1.53
TOTAL PRECIPITATION FOR THE YEAR…………..44.10 DEPARTURE…..+7.37

————————————————————–

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  76/53/65/+1/0.00/…/..             26 WNW VEC1 25 WNW RMY 24

9/18 The low since midnight is 61F, 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 18
HIGH 88F IN 1906
LOW 36F IN 1919
PRECIP 4.25 INCHES IN 1996
PEAK GUST 77e MPH WNW IN 1948

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

TODAY’S REPORT PREPARED BY: Matt Douglas