Tuesday, September 14, 2021

| September 14, 2021 | Reply

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

TUESDAY, SEPTEMBER 14, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0523E
SUNSET:  1755E
 
PARTLY CLOUDY UNTIL NOONTIME WITH GOOD VISIBILITY….

We observed a visibility of 75 miles all day, and partly cloudy
skies until noontime. Cloud cover has increased since then with
a slight drop in pressure. Wind was southeasterly this morning,
but shifted to the southwest. Wind is light with a max gust of
only 15 mph.  

There is some fall color starting to show up in the Neponset
River valley.

The high so far today is 75F, this is a degree above the
daily normal maximum of 74F. The low so far today is 59F,
which is 3 degrees above the daily normal minimum of 56F.


PRELIMINARY STATS FOR AUGUST 2021

TEMPERATURE, Deg. F
Avg. Max. 81.6 [+1.4]
Avg. Min. 65.4 [+2.8]
Mean      73.5 [+2.1]
24-hour corrected mean: 72.6
Max. for month: 92F on the 13th
Min. for month: 58F on the 1st

HEATING DEGREE DAYS
Total heating units:      0 [-11]
Total for the season:    28 [+25]
Total for last season:    3

COOLING DEGREE DAYS
Total cooling units:     271 [+62]
Total for the season:    650 [+54]
Total for last season:   757

PRECIPITATION, Inches
Total: 5.37 [+1.46]
Greatest in 24 hrs: 2.38 ins. on the 4th-5th  

WIND, mph
Avg. uncorrected wind speed:  8.8 mph
Avg. corrected wind speed:    9.5 mph
Prevailing wind direction:   SSW [14%]
Peak gust and direction:     47 ESE on the 22nd

SUNSHINE:
Campbell-Stokes card minutes: 12612 minutes of a possible 24780, or 51%
Astronomical total minutes: 13116 minutes of a possible 25728, or 51%

Today’s Observations:

7 A.M.
Weather: Scattered cirrus, few cumulus
Temperature: 64F; Dew Point: 56F; Relative Humidity: 76%
Wind: ESE @ 4 kts, light and variable
Sea-level pressure: 1020.2 mb; 30.13 in. Hg; rising then more rapidly
Visibility: 75 miles  
6-hr Max temp: 64F
6-hr Min temp: 59F
24-hr Precip: 0.00 ins.
BHO SA 1155 250 -SCT 75 202/64/56/1104/013/ FEW CU THN K LYR ALQDS
WND L/V/ 8/101 53011 10064 20059

10 A.M.
Weather: Scattered cirrus, few cumulus
Temperature: 69F; Dew Point: 53F; Relative Humidity: 56%
Wind: ESE @ 7 kts
Sea-level pressure: 1020.9 mb; 30.15 in Hg; rising unsteadily
Visibility: 75 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 250 -SCT 75 209/69/53/1107/015/ FEW CU ALQDS/ 8/101
52007

1 P.M.
Weather: Broken stratocumulus and thin cirrus
Temperature: 73F, Dew point: 54F; Relative Humidity: 52%
Wind: SSW @ 8 kts
Sea-level pressure: 1019.5 mb; 30.11 in Hg; falling, then more rapdidly
Visibility: 75 miles
6-hr Max temp: 75F
6-hr Min temp: 64F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 BKN 250 -BKN 75 195/73/54/2008/011/ 8/801 58014
10075 20064

SUMMARY FOR MONDAY, SEPTEMBER 13, 2021

TEMPERATURE (DEGREES F)
MAX…….77     NORMAL…..74
MIN…….62     NORMAL…..57
MEAN……70     NORMAL…..65

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….+5
TOTAL DEPARTURE FOR THE MONTH…………………….-9 [-0.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-2
TOTAL HEATING UNITS FOR THE MONTH……………10  DEPARTURE…….-10
TOTAL HEATING UNITS FOR THE SEASON…………..38  DEPARTURE………0
TOTAL HEATING UNITS LAST SEASON TO DATE………10  DEPARTURE…….+27

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….5  DEPARTURE……..+2
TOTAL COOLING UNITS FOR THE MONTH……………30  DEPARTURE…….-18
TOTAL COOLING UNITS FOR THE SEASON………….680  DEPARTURE…….+36
TOTAL COOLING UNITS LAST SEASON TO DATE……..805  DEPARTURE……-125

PEAK WIND GUST (MPH):
                     Official……………….22 NW  @  6:31 A.M.
                     AEROVANE (south tower)…..23 NW  @  6:29 A.M.
                     VECTOR #2 (south tower)….24     @  6:31 A.M.
                     DAVIS #2 (south tower)…..21 NW  @  6:29 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………………16 NW   @  6:33 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..16      @  1:53 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………16 NW   @  1:53 P.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
*LAST OF TWO OCCURRENCES

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL……..9.3 NW [223 total miles]
                     VECTOR #2……………..10.1
                     DAVIS #2………………10.0 NW
                     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….-0.13
TOTAL PRECIPITATION FOR THE MONTH………….5.04  DEPARTURE….+3.47
TOTAL PRECIPITATION FOR THE YEAR………….45.38  DEPARTURE….+9.46

PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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

08/01   77/58/68/-5/T/589/68             23 SSW AERO 24 SSW RMY N/A
08/02   78/61/70/-3/T/821/95             28 WNW AERO 28 WNW RMY N/A
08/03   76/60/68/-5/0.00/302/35          15 N   AERO 16 N   RMY N/A
08/04   75/61/68/-5/0.71/077/09          21 ESE AERO 21 ESE RMY N/A
08/05   68/61/65/-8/1.68/000/00          28 NE  AERO 28 NE  RMY N/A
08/06   85/62/74/+1/0.00/727/85          19 S   AERO 20 WSW RMY N/A
08/07   88/66/77/+4/0.00/520/61          23 SW  AERO 23 SW  RMY N/A
08/08   80/67/74/+2/T/128/15             16 SW  AERO 16 WNW RMY N/A
08/09   75/64/70/-2/0.25/076/09          22 ENE AERO 21 NE  RMY N/A
08/10   78/63/71/-1/0.12/203/24          19 S   AERO 20 S   RMY N/A
08/11   89/70/80/+8/0.00/667/79          29 SSW AERO 28 SSW RMY N/A
08/12   91/71/81/+9/T/580/69             36 WSW AERO 37 WSW RMY N/A TSTM
08/13   92/73/83/+11/0.00/696/83         18 WSW AERO 18 WSW RMY N/A
08/14   87/69/78/+6/T/601/72             25 W   AERO 25 NNW RMY N/A
08/15   80/62/71/-1/0.00/800/96          19 NNW AERO 20 NNW RMY N/A
08/16   78/59/69/-3/0.00/564/68          15 S   AERO 15 S   RMY N/A
08/17   82/63/73/1/0.00/555/67           22 SSW AERO 23 SSW RMY N/A
08/18   86/66/76/+5/0.00/338/41          21 SSW AERO 22 SSW RMY N/A
08/19   81/69/75/+4/0.62/222/27          41 S   AERO 43 S   RMY N/A
08/20   78/70/74/+3/0.01/066/08          21 WSW AERO N/A    RMY N/A
08/21   86/69/78/+7/0.00/581/71          17 S   AERO 17 S   RMY N/A
08/22   74/66/70/-1/0.78/000/00          47 ESE AERO 48 ESE RMY N/A
08/23   83/68/76/+5/1.17/333/41          25 SSE AERO 26 SSE RMY N/A TSTM
08/24   86/67/77/+6/0.01/567/70          21 NNW AERO 21 NNW RMY N/A
08/25   89/70/80/+10/0.00/783/97         17 SW  AERO 18 SW  RMY N/A
08/26   92/72/82/+12/0.00/765/95         19 WSW AERO 18 WSW RMY N/A
08/27   89/70/80/+10/T/626/78            30 ENE AERO 30 ENE RMY N/A
08/28   70/59/65/-5/0.02/296/37          34 ENE AERO 34 ENE RMY N/A
08/29   72/59/66/-4/T/016/02             20 S   AERO 21 S   RMY N/A
08/30   84/67/76/+7/0.00/246/31          25 SW  AERO 26 SW  RMY N/A
08/31   80/65/73/+4/0.00/371/47          27 WNW AERO 28 WNW RMY N/A

RECORDS FOR THE MONTH

08/22 NEW PEAK GUST RECORD OF 47 MPH,
      BEATING THE OLD RECORD OF 44 MPH IN 1987

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/…/..          24 WNW AERO 25 WNW RMY N/A
09/07   78/57/68/+1/0.00/…/..          23 WSW AERO 22 WSW RMY N/A
09/08   81/61/71/+4/0.00/…/..          43 S   AERO 45 S   RMY N/A
09/09   71/64/68/+1/0.90/…/..          33 S   AERO 36 S   RMY N/A
09/10   74/55/65/-1/0.04/…/..          31 NW  AERO 32 WNW RMY N/A
09/11   75/51/63/-3/0.00/…/..          24 SW  AERO 24 SW  RMY N/A
09/12   79/60/70/+4/0.00/…/..          33 SW  AERO 32 SW  RMY N/A
09/13   77/62/70/+5/0.06/…/..          22 NW  AERO 23 NW  RMY N/A

09/14  The low since midnight is 59F, the daily normal low is 57F

DAILY EXTREMES

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

RECORDS FOR SEPTEMBER 14
HIGH 90F IN 1931
LOW 34F IN 1911
PRECIP 2.90 INCHES IN 1944 (Great Atlantic Hurricane in 1944)
PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane in 1944)

RECORDS FOR SEPTEMBER 15
HIGH 89F IN 1931
LOW 35F IN 1913
PRECIP 3.93 INCHES IN 1904 (Extra-tropical storm making landfall in New England on 9/15/1904 passing east of BHO and bringing a storm total of 4.11 inches 9/14-15/1904)
PEAK GUST 65e MPH NW IN 1944 (In the wake of Great Atlantic Hurricane)

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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