Tuesday, August 31, 2021

| September 1, 2021 | Reply

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

TUESDAY, AUGUST 31, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0509E
SUNSET:  1819E
 
A LOT OF CLOUD COVER, BUT AN OTHERWISE PLEASANT DAY….

Today marks the 4th day in a row that has again featured a lot of
cloud cover. A cold front has moved through early this afternoon
marked only by a bump in wind speeds and drying air.

Humidity levels are lower than yesterday, holding in the mid 60s
this morning, but has started dropping into the low 60s early
this afternoon as a weak cold front slipped through. Dew points are
expected to continue dropping into the 50s through the remainder of
the afternoon and evening.

The wind had been light all morning only averaging around 5mph, but
has bumped up early this afternoon out of the west gusting 20-25mph.

Visibility was limited to 30-40 miles this morning due to haziness,
but as the air dries out early this afternoon, the visibility has
increased to around 60 miles!

The high so far today is 80F, this is 2 degrees above the daily
normal maximum of 78F. The low so far today is 66F, which is 6
degrees above the daily normal minimum of 60F.


Today’s Observations:

7 A.M.
Weather: Broken cirrocumulus, thin overcast cirrus, few altocumulus
distant E-SSE
Temperature: 68F; Dew Point: 63F; Relative Humidity: 84%
Wind: WNW @ 7 kts
Sea-level pressure: 1009.0 mb; 29.80 in. Hg; rising, then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 73F
6-hr Min temp: 66F
24-hr Precip: 0.00 ins.
BHO SA 1155 E200 BKN 250 -OVC 30 090/68/63/2907/980/ FEW BINOVC ALQDS
FEW AC DSNT E-SSE HAZY/ 8/059 51004 10073 20066

10 A.M.
Weather: Scattered altocumulus/castellanus, broken cirrocumulus,
thin overcast cirrus, few breaks in overcast W-WNW  
Temperature: 76F; Dew Point: 65F; Relative Humidity: 69%
Wind: WNW @ 6 kts
Sea-level pressure: 1008.8 mb; 29.79 in Hg; rising, then falling
Visibility: 40 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 110 SCT 200 BKN 250 -OVC 40 088/76/65/2906/979/ FEW BINOVC W-NNW/
8/089 58002

1 P.M.
Weather: Broken altocumulus, thin broken cirrus, few cumulus all quadrants,
clearing line W-N-NE moving ESE
Temperature: 78F, Dew point: 62F; Relative Humidity: 58%
Wind: W @ 8G16 kts
Sea-level pressure: 1007.7 mb; 29.76 in Hg; falling, then more slowly
Visibility: 60 miles
6-hr Max temp: 80F
6-hr Min temp: 68F
6-hr Precip: 0.00 ins.
BHO SA 1755 E150 BKN 200 BKN 250 -BKN 60 077/78/62/2808G16/976/ FEW CU ALQDS
CLRG LINE W-N-NE MVG ESE/ 8/258 56011 10080 20068

SUMMARY FOR MONDAY, AUGUST 30, 2021

TEMPERATURE (DEGREES F)
MAX…….84     NORMAL…..78
MIN…….67     NORMAL…..61
MEAN……76     NORMAL…..69

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….. +7
TOTAL DEPARTURE FOR THE MONTH…………………..+68 [+2.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE MONTH…………….0  DEPARTURE…….-10
TOTAL HEATING UNITS FOR THE SEASON…………..28  DEPARTURE…….+11
TOTAL HEATING UNITS LAST SEASON TO DATE……….3  DEPARTURE…….+25

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY……………11  DEPARTURE……..+6
TOTAL COOLING UNITS FOR THE MONTH…………..263  DEPARTURE…….+59
TOTAL COOLING UNITS FOR THE SEASON………….642  DEPARTURE…….+51
TOTAL COOLING UNITS LAST SEASON TO DATE……..757  DEPARTURE……-115

PEAK WIND GUST (MPH):
                     Official……………….25 SW  @ 11:16 A.M.
                     AEROVANE (south tower)…..26 SW  @ 10:58 A.M.
                     VECTOR #2 (south tower)….28     @  7:58 A.M.
                     DAVIS #2 (south tower)…..26 S   @  7:36 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………………21 SW  @ 11:19 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..20     @ 11:17 A.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………20 SW  @ 11:18 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…….12.5 SSW [300 total miles]
                     VECTOR #2……………..13.2
                     DAVIS #2………………12.8 SW
                     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….-0.12
TOTAL PRECIPITATION FOR THE MONTH………….5.37  DEPARTURE….+1.57
TOTAL PRECIPITATION FOR THE YEAR………….40.34  DEPARTURE….+6.10

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/…/..          21 WSW AERO N/A    RMY N/A
08/21   86/69/78/+7/0.00/…/..          17 S   AERO 17 S   RMY N/A
08/22   74/66/70/-1/0.78/…/..          47 ESE AERO 48 ESE RMY N/A
08/23   83/68/76/+5/1.17/…/..          25 SSE AERO 26 SSE RMY N/A TSTM
08/24   86/67/77/+6/0.01/…/..          21 NNW AERO 21 NNW RMY N/A
08/25   89/70/80/+10/0.00/…/..         17 SW  AERO 18 SW  RMY N/A
08/26   92/72/82/+12/0.00/…/..         19 WSW AERO 18 WSW RMY N/A
08/27   89/70/80/+10/T/…/..            30 ENE AERO 30 ENE RMY N/A
08/28   70/59/65/-5/0.02/…/..          34 ENE AERO 34 ENE RMY N/A
08/29   72/59/66/-4/T/…/..             20 S   AERO 21 S   RMY N/A
08/30   84/67/76/+7/0.00/…/..          25 SW  AERO 26 SW  RMY N/A

08/31   The low since midnight is 66F, the daily normal low is 60F

RECORDS FOR THE MONTH

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

DAILY EXTREMES

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

RECORDS FOR AUGUST 31
HIGH 94F IN 1953
LOW 42F IN 1976
PRECIP 2.46 INCHES IN 1954
PEAK GUST 125 MPH SE IN 1954 [CAROL – RECORD FOR MONTH]

RECORDS FOR SEPTEMBER 1
HIGH 93F IN 1969, 2010
LOW 47F IN 1975, 2017
PRECIP 2.32 INCHES IN 2013
PEAK GUST 59e MPH S IN 1945, SSW IN 1965

TODAY’S REPORT PREPARED BY: Matt Douglas

Category: Daily Discussions

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