Tuesday, October 12, 2021

| October 12, 2021 | Reply

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

TUESDAY, OCTOBER 12, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0554E
SUNSET:  1707E

A MIX OF SUN AND CLOUDS WITH WARM AIR AND LIGHT WIND….

We were treated to a not too common complete undercast this
morning as dense fog was trapped under an inversion. Blue Hill
was high enough to be above this inversion. So while many were
waking up to fog, we were experiencing a nice early morning
with sunshine here on the summit. We could see only the tops of
about 5 skyscrapers in Boston as we looked north, with other
hill tops around the region looking like islands among a sea
of clouds! It was a really surreal sight!

The fog burned off by late morning and then everyone has been
able to share in the splendor of the day. Only some high thin
cirrus clouds are decorating the sky, thus allowing for abundant
sunshine. Temperatures have likewise responded with readings
getting to the low-mid 70s for many.

With a dew point hovering in the upper 50s to around 60, it
does feel a tad sticky, but compared to all the humidity this
summer, it’s really not bad at all.

The wind has been very light today, only averaging around 4mph
for the day. The peak gust so far has only been 12 mph! As high
pressure slips off the Mid Atlantic coast, the wind has backed
from north this morning to south this afternoon. I suspect
speeds may pick up a bit for a time this evening.

Visibility has been limited today, this morning due to fog, and
this afternoon due to haziness. We were able to see 20 miles
this morning above the inversion, but has improved to only
around 40 miles this afternoon.

The high so far today is 73F, 11 degrees above the normal max of
62F. The low since midnight is 54F, 9 degrees above the normal
low of 45F.


PRELIMINARY STATS FOR SEPTEMBER 2021

TEMPERATURE, Deg. F
Avg. Max. 73.2 [+0.5]
Avg. Min. 57.4 [+1.8]
Mean      65.3 [+1.1]
24-hour corrected mean: 64.8
Max. for month: 82F on the 15th
Min. for month: 45F on the 29th

HEATING DEGREE DAYS
Total heating units:     46 [-54]
Total for the season:    74 [-44]
Total for last season:   98

COOLING DEGREE DAYS
Total cooling units:      62 [-12]
Total for the season:    714 [+44]
Total for last season:   830

PRECIPITATION, Inches
Total: 6.64 [+2.58]
Greatest in 24 hrs: 4.00 inches on the 1st/2nd

WIND, mph
Avg. uncorrected wind speed:  10.5 mph
Avg. corrected wind speed:    11.0 mph
Prevailing wind direction:   NW [11%]
Peak gust and direction:     49 ENE on the 2nd

SUNSHINE:
Campbell-Stokes card minutes: 11490 of a possible 21582, or 53%
Astronomical total minutes: 11965 of a possible 22423, or 53%


Today’s Observations:

7 A.M.
Weather: Broken undercast stratus, thin broken cirrus
Temperature: 57F; Dew Point: 57F; Relative Humidity: 100%
Wind: NNW @ 3 kts, wind light
Sea-level pressure: 1021.6 mb; 30.17 in. Hg: rising, then more rapidly
Visibility: 20 miles
6-hr Max temp: 57F
6-hr Min temp: 54F
24-hr Precip: 0.00 ins.
BHO SA 1155 /// BKN E250 -BKN 20 216/57/57/3303/017/ BRKS IN UNDERCAST
E-ESE VSBY 20 ABV INVRSN WND LGT/ 8/601 53009 10057 20054

10 A.M.
Weather: Thin broken cirrus, few stratocumulus distant SW-W and distant E-SE
Temperature: 62F; Dew Point: 59F; Relative Humidity: 90%
Wind: Estimated SW @ 2 kts, wind light and variable
Sea-level pressure: 1021.4 mb; 30.16 in Hg; rising then falling
Visibility: 40 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E250 -BKN 40 214/62/59/E2302/016/ FEW SC DSNT SW-W AND DSNT E-SE
WND L/V/ 8/501 58002

1 P.M.
Weather: Thin broken cirrus
Temperature: 72F, Dew point: 58F; Relative Humidity: 61%
Wind: S @ 4 kts, wind light
Sea-level pressure: 1019.7 mb; 30.11 in Hg; falling, then more rapidly
Visibility: 40 miles
6-hr Max temp: 73F
6-hr Min temp: 57F
6-hr Precip: 0.00 ins.
BHO SA 1755 E250 -BKN 40 197/72/58/1904/011/ WND LGT/ 8/001 58017 10073 20057

SUMMARY FOR MONDAY, OCTOBER 11, 2021

TEMPERATURE (DEGREES F)
MAX…….67     NORMAL…..63
MIN…….56     NORMAL…..46
MEAN……62     NORMAL…..54

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….. +8
TOTAL DEPARTURE FOR THE MONTH……………………..+29 [+2.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….3  DEPARTURE……..-8
TOTAL HEATING UNITS FOR THE MONTH……………68  DEPARTURE…….-34
TOTAL HEATING UNITS FOR THE SEASON………….142  DEPARTURE…….-77
TOTAL HEATING UNITS LAST SEASON TO DATE……..182  DEPARTURE…….-40

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL COOLING UNITS FOR THE MONTH…………….0  DEPARTURE……..-5
TOTAL COOLING UNITS FOR THE SEASON………….714  DEPARTURE…….+39
TOTAL COOLING UNITS LAST SEASON TO DATE……..831  DEPARTURE……-117

PEAK WIND GUST (MPH):
                     Official……………….20 NE  @  3:31 A.M.
                     AEROVANE (south tower)…..21 NE  @  3:23 A.M.
                     VECTOR #2 (south tower)….23     @  3:31 A.M.
                     DAVIS #2 (south tower)…..20 ENE @  2:56 A.M.
                     ASOS………..OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1……OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1…….OUT OF SERVICE D/T RENOVATIONS
                     RMY…………OUT OF SERVICE D/T RENOVATIONS  
                     MERLIN………OUT OF SERVICE D/T RENOVATIONS

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………14 NE  @  3:24 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15     @  2:56 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 E   @  2:57 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE…….OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE…OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE..OUT OF SERVICE D/T RENOVATIONS
MAXIMUM 2-MINUTE RMY AVERAGE……..OUT OF SERVICE D/T RENOVATIONS

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL…….. 8.0 NE  [192 total miles]
                     VECTOR #2……………… 8.7
                     DAVIS #2………………. 8.6 ENE
                     RMY……………..OUT OF SERVICE D/T RENOVATIONS
                     ASOS…………….OUT OF SERVICE D/T RENOVATIONS
                     VECTOR #1………..OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1…………OUT OF SERVICE D/T RENOVATIONS   

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….0.00  DEPARTURE….-0.18
TOTAL PRECIPITATION FOR THE MONTH………….2.10  DEPARTURE….+0.24
TOTAL PRECIPITATION FOR THE YEAR………….49.08  DEPARTURE….+8.81

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

09/01   68/56/62/-7/1.47/000/00          34 NNE AERO 37 NNE RMY N/A    
09/02   71/55/63/-6/2.53/322/41          49 ENE AERO 52 ENE RMY N/A
09/03   72/52/62/-6/0.00/735/94          23 NW  AERO 23 NW  RMY N/A
09/04   76/55/66/-2/0.00/757/97          22 WNW AERO 21 WNW RMY N/A
09/05   72/60/66/-2/0.04/008/01          27 S   AERO 29 S   RMY N/A
09/06   80/61/71/+3/0.00/557/72          24 WNW AERO 25 WNW RMY N/A
09/07   78/57/68/+1/0.00/732/95          23 WSW AERO 22 WSW RMY N/A
09/08   81/61/71/+4/0.00/646/84          43 S   AERO 45 S   RMY N/A
09/09   71/64/68/+1/0.90/000/00          33 S   AERO 36 S   RMY N/A
09/10   74/55/65/-1/0.04/595/78          31 NW  AERO 32 WNW RMY N/A
09/11   75/51/63/-3/0.00/730/96          24 SW  AERO 24 SW  RMY N/A
09/12   79/60/70/+4/0.00/591/78          33 SW  AERO 32 SW  RMY N/A
09/13   77/62/70/+5/0.06/559/74          22 NW  AERO 23 NW  RMY N/A
09/14   75/59/67/+2/0.00/444/59          23 S   AERO 25 S   RMY N/A
09/15   82/65/74/+9/T/539/72             32 SSW AERO 35 SSW RMY N/A
09/16   69/61/65/+1/0.27/037/05          24 ENE AERO 24 ENE RMY N/A TSTM      
09/17   66/60/63/-1/0.02/000/00          22 NE  AERO 23 NE  RMY N/A
09/18   74/62/68/+5/0.04/207/28          17 WNW AERO 18 WNW RMY N/A TSTM
09/19   71/57/64/+1/0.15/619/84          23 NNE AERO 24 NNE RMY N/A
09/20   71/55/63/0/0.00/647/88           20 SE  AERO 20 SE  RMY N/A
09/21   75/55/65/+3/0.00/490/67          19 SSE AERO 20 SSE RMY N/A
09/22   75/65/70/+8/0.02/153/21          30 S   AERO 30 S   RMY N/A
09/23   78/65/72/+10/0.08/298/41         36 SSE AERO 37 SSE RMY N/A
09/24   75/62/69/+8/0.02/007/01          43 SSE AERO 45 SSE RMY N/A
09/25   74/59/67/+6/0.02/303/42          14 N   AERO 14 NNW RMY N/A
09/26   73/54/64/+4/0.57/510/71          33 WNW AERO 32 WNW RMY N/A
09/27   73/52/63/+3/T/529/74             30 SW  AERO 30 SW  RMY N/A
09/28   67/52/60/+1/0.40/028/04          27 SSW AERO 25 SSW RMY N/A TSTM
09/29   63/45/54/-5/0.00/568/80          25 NNW AERO 25 NNW RMY N/A
09/30   60/46/53/-6/0.01/354/50          22 NNW AERO 21 NNW RMY N/A

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY:  R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

10/01   64/44/54/-4/0.00/…/..          20 WNW AERO 20 WNW RMY N/A
10/02   73/47/60/+2/0.00/…/..          24 WSW AERO 23 WSW RMY N/A
10/03   65/55/60/+3/0.09/…/..          19 E   AERO 19 E   RMY N/A
10/04   59/51/55/-2/1.69/…/..          30 E   AERO 30 E   RMY N/A
10/05   58/50/54/-3/0.30/…/..          22 NNE AERO 23 NE  RMY N/A
10/06   69/50/60/+4/0.00/…/..          15 N   AERO 16 N   RMY N/A
10/07   73/55/64/+8/0.00/…/..          15 WSW AERO 15 W   RMY N/A
10/08   69/55/62/+7/T/…/..             24 ENE AERO 23 ENE RMY N/A
10/09   62/54/58/+3/0.01/…/..          23 E   AERO 23 E   RMY N/A
10/10   62/54/58/+3/T/…/..             22 E   AERO 21 E   RMY N/A
10/11   67/56/62/+8/0.01/…/..          20 NE  AERO 21 NE  RMY N/A

10/12   The low since midnight is 54F, the daily normal low is 45F

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

RECORDS FOR OCTOBER 12
HIGH 87F IN 1954
LOW 31F IN 1906
PRECIP 1.70 INCHES IN 1948
SNOWFALL TRACE IN 1904, 1941
PEAK GUST 55 MPH NW IN 1963

RECORDS FOR OCTOBER 13
HIGH 84F IN 1930,1954
LOW 29F IN 2012
PRECIP 5.87 INCHES IN 1895
SNOWFALL 4.2 INCHES IN 1934
PEAK GUST 46e MPH W IN 1950

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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