Thursday, July 22, 2021

| July 22, 2021 | Reply

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

THURSDAY, JULY 22, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0426E
SUNSET:  1914E

A VERY NICE SUMMER DAY ATOP GREAT BLUE HILL….

The smoke layer is completely gone from yesterday
accompanied by partly cloudy skies and lower humidity
than days prior. Dew points are hanging in the mid 50’s
and visibility is good at 60 miles.  

We have a nice northwesterly breeze around 15 mph keeping
the region cool and dry for a midsummer’s day.

We are still on the watch for breaking the record for
wettest July on record. We are currently 0.99″ away from
tying the record from 1938.

Here are the rankings for wettest Julys as compiled by our
Chief Scientist, Mike Iacono…

BHO Wettest Julys, inches (1885-2021)

1) 11.67 in 1938
2) 10.68 in 1988
3) 10.43 in 1921
4) 9.52 in 1915
5) 8.47 in 1889
6) 7.62 in 2009
7) 7.55 in 1916

The high so far today is 79F, 3 degrees below the daily
normal maximum of 82F. The low so far today is 58F, which is
6 degrees less than the daily normal minimum of 64F.

On a side note, the renovations have now begun in earnest.
We are no longer operating out of the tower and have moved to
another part of the building. All wind instruments on the main
tower have been taken offline and will remain so until further
notice. Please be patient with us as we navigate through our
new routine. Data at times may be delayed.

———————————————–

Today’s Observations:

7 A.M.
Weather: Clear, few cumulus offshore
Temperature: 64F; Dew Point: 56F; Relative Humidity: 75%
Wind: N @ 11 kts
Sea-level pressure: 30.02 in. Hg; rising then falling
Visibility: 65 miles
6-hr Max temp: 64F
6-hr Min temp: 58F
24-hr Precip: 0.02 in.
BHO SA 1155 CLR 65 167/64/56/0111/002/ FEW CU OFFSHR/ 8/100
53020 70002 10064 20058

10 A.M.
Weather: Clear, few cumulus E-WNW, few altocumulus SW
Temperature: 72F; Dew Point: 57F; Relative Humidity: 59%
Wind: N @ 8G12 kts
Sea-level pressure: 30.03 in Hg; rising unsteadily
Visibility: 60 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 60 171/72/57/3608G12/003/ FEW CU E-WNW FEW
AC SW/ 8/180 52004


1 P.M.
Weather: Scattered cumulus and altocumulus, broken
cirrostratus
Temperature: 78F, Dew point: 58F; Relative Humidity: 51%
Wind: WNW @ 6G14 kts  
Sea-level pressure: 30.04 in Hg; rising unsteadily
Visibility: 60 miles
6-hr Max temp: 79F
6-hr Min temp: 64F
6-hr Precip: 0.00 ins.
BHO SA 1755 40 SCT 70 SCT 250 BKN 60 173/78/58/3006G14/004/
8/186 52002 10079 20064


SUMMARY FOR WEDNESDAY, JULY 21, 2021

TEMPERATURE (DEGREES F)
MAX…….79     NORMAL…..82
MIN…….62     NORMAL…..64
MEAN……71     NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….-2
TOTAL DEPARTURE FOR THE MONTH…………………-80 [-4.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2021 THRU JUN 2022)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE………0
TOTAL HEATING UNITS FOR THE MONTH……………26  DEPARTURE…….+21
TOTAL HEATING UNITS FOR THE SEASON…………..26  DEPARTURE…….+21
TOTAL HEATING UNITS LAST SEASON TO DATE……….1  DEPARTURE…….+25

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY…………….6  DEPARTURE……..-3
TOTAL COOLING UNITS FOR THE MONTH…………..104  DEPARTURE…….-60
TOTAL COOLING UNITS FOR THE SEASON………….330  DEPARTURE…….+27
TOTAL COOLING UNITS LAST SEASON TO DATE……..348  DEPARTURE…….-18

PEAK WIND GUST (MPH):
                     Official……………….26 NNW @ 12:20 A.M.
                     AEROVANE (south tower)…..23 NNW @ 12:12 A.M.
                     VECTOR #2 (south tower)….28 NNW @ 12:20 A.M.
                     DAVIS #2 (south tower)…..24 NNW @ 12:20 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………………17 NNW @ 12:22 A.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18     @  8:36 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………17 N   @ 12:22 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…… 7.5 W  [173 total miles]
                     VECTOR #2……………. 8.2
                     DAVIS #2…………….. 8.0 W
                     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…….0.02  DEPARTURE….-0.09
TOTAL PRECIPITATION FOR THE MONTH…………10.68  DEPARTURE….+8.35
TOTAL PRECIPITATION FOR THE YEAR………….34.06  DEPARTURE….+4.76

 

PRELIMINARY CLIMATE SUMMARY FOR JULY 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


07/01   80/65/73/+2/0.74/155/17           22 W   AERO 20 WSW  RMY 21
07/02   65/55/60/-11/1.49/000/00          37 NE  AERO 36 NE   RMY 39
07/03   56/54/55/-17/1.98/000/00          41 NE  AERO 44 NE   RMY 45 TSTM
07/04   66/54/60/-12/0.16/191/21          26 ENE AERO 23 ENE  RMY 26
07/05   74/53/64/-8/0.01/546/60           26 SSW AERO 28 SSW  RMY 27
07/06   87/66/77/+5/0.26/255/28           37 W   AERO 48 W    RMY 38 TSTM
07/07   88/88/77/+5/0.77/699/77           63 NW  AERO 75 NW   RMY 70 TSTM
07/08   67/59/63/-9/0.38/109/12           46 W   AERO 46 W    RMY 51 TSTM
07/09   73/62/68/-5/3.02/163/18           40 WNW AERO 44 WNW  RMY 43
07/10   71/63/67/-6/0.07/109/12           23 NE  AERO 21 NNE  RMY 22
07/11   81/61/71/-2/T/325/36              21 SW  AERO 19 S    RMY N/A
07/12   67/61/64/-9/1.01/000/00           31 ENE AERO 31 ENE  RMY N/A
07/13   66/60/63/-10/0.02/000/00          19 E   AERO 18 E    RMY N/A
07/14   80/62/71/-2/0.01/…/..           19 S   AERO 18 S    RMY N/A
07/15   88/67/78/+5/0.00/…/..           19 WSW AERO 18 SSW  RMY N/A
07/16   90/70/80/+7/0.04/…/..           36 NNW AERO 39 NNW  RMY N/A TSTM
07/17   78/64/71/-2/0.34/…/..           26 ENE AERO 25 ENE  RMY N/A TSTM
07/18   74/63/69/-4/0.15/…/..           22 NE  AERO 22 NE   RMY N/A TSTM
07/19   71/63/67/-6/0.07/…/..           17 ENE AERO 17 ENE  RMY N/A
07/20   83/64/74/+1/0.00/…/..           23 NW  AERO 23 NW   RMY N/A
07/21   79/62/71/-2/…./…/..           26 NNW AERO 23 NNW  RMY N/A TSTM

07/22   The low since midnight is 58F, the daily normal low is 64F

RECORDS FOR JULY:
JULY 2: Record daily precipitation of 1.49″,
        Surpasses previous record of 1.42″ set in 1986

JULY 3: Record daily precipitation of 1.98″,
        Surpasses previous record of 1.36″ set in 1985

JULY 7: Record peak gust of 63 MPH,
        Surpasses previous record of 55 MPH set in 1989


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

RECORDS FOR JULY 22
HIGH 99F IN 1926, 2011
LOW 52F IN 1890
PRECIP 1.73 INS IN 1887
PEAK GUST 55 MPH IN 1983

RECORDS FOR JULY 23
HIGH 99F IN 1952
LOW 51F IN 1923,1977
PRECIP 1.82 INS IN 1953
PEAK GUST 54e MPH S IN 1946

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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