Friday, July 16, 2021

| July 16, 2021 | Reply

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

FRIDAY, JULY 16, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0422E
SUNSET:  1918E

FEELING QUITE TROPICAL ATOP GREAT BLUE HILL….

The main headline here today is the building heat and
elevated dew points. Overnight low only achieved 70F,
which nearly set a new record. Highest minimum temperature
for today is 71F set in 1901, 1958, 1968, & 2013. The
mercury has risen sharply throughout the morning, reaching
89F by 1 PM.

Skies have a milky appearance thanks to considerable haze. Few
cumulus and cirrus are decorating the scenery with developing
cumulonimbus to our distant west. Visibility is struggling to
break 30 miles. 25 statute miles is the peak thus far.

The high so far today is 89F, 7 degrees above the daily average
of 82F. The low so far today is 70F, which is 6 degrees above
the daily average of 64F.

On a side note, the renovations have begun in earnest this week.
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 patience with us as we navigate through our
new routine. Data at times may be delayed.

———————————————–
PRELIMINARY STATS FOR JUNE 2021

TEMPERATURE, Deg. F
Avg. Max. 80.9 [+5.9]
Avg. Min. 60.4 [+3.3]
Mean      70.7 [+4.6]
24-hour corrected mean: 70.0
Max. for month: 95F on the 29th
Min. for month: 50F on the 1st

HEATING DEGREE DAYS
Total heating units:     19 [-54]
Total for the season:  5597 [-725]
Total for last season: 5852

COOLING DEGREE DAYS
Total cooling units:     197 [+92]
Total for the season:    226 [+97]
Total for last season:   184

PRECIPITATION, Inches
Total: 2.72 [-1.59]
Greatest in 24 hrs: 0.68 inches on the 22nd

WIND, mph
Avg. uncorrected wind speed: 10.4 mph
Avg. corrected wind speed:   10.9 mph
Prevailing wind direction:   SSW [22%]
Peak gust and direction:     51 NW on the 30th

SUNSHINE:
Campbell-Stokes card minutes: 16230 minutes of a possible 26376 or 62%
Astronomical total minutes: 16866 minutes of a possible 27415 or 62%


Today’s Observations:

7 A.M.
Weather: (thin) Scattered Cirrus
Temperature: 76F; Dew Point: 71F; Relative Humidity: 85%
Wind: SSW @ 11G15 kts
Sea-level pressure: 30.01 in. Hg; Steady, then rising
Visibility: 20 miles, hazy
6-hr Max temp: 76F
6-hr Min temp: 70F
24-hr Precip: 0.00 in.
BHO SA 1155 250 -SCT 20 162/76/71/2011G15/001/ HAZY/ 8/001 53002
10076 20070

10 A.M.
Weather: (thin) Broken Cirrus, few cumulus
Temperature: 85F; Dew Point: 72F; Relative Humidity: 65%
Wind: WSW @ 11G19 kts
Sea-level pressure: 30.00 in Hg; Falling, then falling more rapidly
Visibility: 25 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 E250 -BKN 25 159/85/72/2411G19/000/ FEW CU ALQDS
HAZY/ 8/101 58003


1 P.M.
Weather: Scattered Cumulus (cumulonimbus distant E-NW moving E)
Temperature: 89F, Dew point: 71F; Relative Humidity: 56%
Wind: WSW @ 14G22 kts  
Sea-level pressure: 29.99 in Hg; falling unsteadily
Visibility: 25 miles
6-hr Max temp: 89F
6-hr Min temp: 76F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT 25 155/89/71/2414G22/999/ FEW CI ALQDS
CB DSNT E-NW MVG E HAZY/ 8/101 57004 10089 20076


SUMMARY FOR THURSDAY, JULY 15, 2021

TEMPERATURE (DEGREES F)
MAX…….88     NORMAL…..82
MIN…….67     NORMAL…..64
MEAN……78     NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+5
TOTAL DEPARTURE FOR THE MONTH…………………-76 [-5.3 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…….+22
TOTAL HEATING UNITS FOR THE SEASON…………..26  DEPARTURE…….+22
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE…….+26

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY……………13  DEPARTURE…….+5
TOTAL COOLING UNITS FOR THE MONTH……………62  DEPARTURE……-52
TOTAL COOLING UNITS FOR THE SEASON………….288  DEPARTURE……+36
TOTAL COOLING UNITS LAST SEASON TO DATE……..299  DEPARTURE……-11

PEAK WIND GUST (MPH):
                     Official (via Vector #2)…19 WSW @ 4:39 P.M.
                     AEROVANE (south tower)…..18 SSW @ 8:27 P.M.
                     VECTOR #2 (south tower)….20     @ 4:39 P.M.
                     DAVIS #2 (south tower)…..18 W   @ 4:40 P.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………………13 SW  @ 10:59 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..14     @ 10:53 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………14 W   @ 4:41 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

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL…….6.5 WSW [157 total miles]
                     VECTOR #2……………..7.6
                     DAVIS #2………………7.2 WSW
                     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….-0.11
TOTAL PRECIPITATION FOR THE MONTH………….9.92  DEPARTURE….+8.24
TOTAL PRECIPITATION FOR THE YEAR………….33.30  DEPARTURE….+4.65
     

PRELIMINARY CLIMATE SUMMARY FOR JUNE 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

06/01   74/50/62/0/0.00/425/47            20 WSW  AERO 24 WSW  RMY 22
06/02   80/55/68/+6/0.00/553/61           28 S    AERO 25 S    RMY 28
06/03   73/56/65/+3/0.01/073/08           29 SSW  AERO 29 SSW  RMY 29
06/04   77/61/69/+6/0.02/054/06           23 SW   AERO 25 WSW  RMY 25 TSTM
06/05   87/60/74/+11/0.00/801/88          32 SSW  AERO 37 SSW  RMY 35
06/06   91/69/80/+17/0.00/819/90          30 WSW  AERO 31 WSW  RMY 32
06/07   92/69/81/+17/0.00/838/92          31 SSW  AERO 35 SSW  RMY 34
06/08   92/69/81/+17/0.06/456/50          24 WSW  AERO 25 WSW  RMY 27 TSTM
06/09   88/70/79/+15/0.02/530/58          21 N    AERO 23 NNW  RMY 23
06/10   70/53/62/-3/0.00/795/87           28 NE   AERO 28 NE   RMY 28
06/11   70/51/61/-4/0.13/411/45           21 SSE  AERO 22 SSE  RMY 22
06/12   72/53/63/-2/0.43/430/47           20 WSW  AERO 18 WSW  RMY 20
06/13   82/56/69/+4/0.00/860/94           26 SSW  AERO 29 SSW  RMY 29
06/14   65/56/61/-5/0.63/027/03           28 S    AERO 30 SSE  RMY 29
06/15   77/61/69/+3/T/357/39              18 NE   AERO 20 NE   RMY 18 TSTM
06/16   73/56/65/-1/0.00/769/84           27 NNW  AERO 31 NNW  RMY 27
06/17   77/52/65/-2/0.00/880/96           21 WNW  AERO 21 NW   RMY 23
06/18   82/56/69/+2/T/789/86              26 WSW  AERO 28 WSW  RMY 30
06/19   86/63/75/+8/0.09/504/55           30 SW   AERO 32 SW   RMY 32
06/20   85/63/74/+6/0.00/816/89           24 S    AERO 25 SSW  RMY 25
06/21   83/65/74/+6/0.00/514/56           37 SSW  AERO 39 SSW  RMY 39
06/22   84/58/71/+3/0.68/229/25           30 NW   AERO 31 NW   RMY 31 TSTM
06/23   73/52/63/-5/0.00/807/88           25 NW   AERO 24 NW   RMY 26
06/24   76/58/67/-2/T/899/98              25 SE   AERO 24 SE   RMY 25
06/25   71/57/64/-5/0.11/046/05           23 S    AERO 23 S    RMY 23
06/26   81/61/71/+2/0.00/376/41           36 SSW  AERO 37 SSW  RMY 38
06/27   85/70/78/+9/0.00/476/52           38 SW   AERO 39 SW   RMY 42
06/28   93/70/82/+12/0.00/851/93          28 SW   AERO 28 SW   RMY 28
06/29   95/73/84/+14/T/750/82             26 W    AERO 30 W    RMY 27 TSTM
06/30   94/69/82/+12/0.54/731/80          51 NW   AERO 53 NW   RMY 56 TSTM

RECORDS FOR JUNE:
JUNE 7: Record high minimum temperature of 69F,
        Surpasses previous record of 66F set in 1922 and 1953

JUNE 29: Record high maximum temperature of 95F,
        Surpasses previous record of 94F set in 1933

JUNE 29: Record high minimum temperature of 73F,
        Surpasses previous record of 71F set in 1999

JUNE 30: Record high maximum temperature of 94F,
        Ties previous record of 94F set in 1964


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/…/..           22 W   AERO 20 WSW  RMY 21
07/02   65/55/60/-11/1.49/…/..          37 NE  AERO 36 NE   RMY 39
07/03   56/54/55/-17/1.98/…/..          41 NE  AERO 44 NE   RMY 45 TSTM
07/04   66/54/60/-12/0.16/…/..          26 ENE AERO 23 ENE  RMY 26
07/05   74/53/64/-8/0.01/…/..           26 SSW AERO 28 SSW  RMY 27
07/06   87/66/77/+5/0.26/…/..           37 W   AERO 48 W    RMY 38 TSTM
07/07   88/88/77/+5/0.77/…/..           63 NW  AERO 75 NW   RMY 70 TSTM
07/08   67/59/63/-9/0.38/…/..           46 W   AERO 46 W    RMY 51 TSTM
07/09   73/62/68/-5/3.02/…/..           40 WNW AERO 44 WNW  RMY 43
07/10   71/63/67/-6/0.07/…/..           23 NE  AERO 21 NNE  RMY 22
07/11   81/61/71/-2/T/…/..              21 SW  AERO 19 S    RMY N/A
07/12   67/61/64/-9/1.01/…/..           31 ENE AERO 31 ENE  RMY N/A
07/13   66/60/63/-10/0.02/…/..          19 E   AERO 18 E    RMY N/A
07/14   80/62/71/-2/…./…/..           19 S   AERO 18 S    RMY N/A
07/15   88/67/78/+5/…/…/..            19 WSW AERO 18 SSW  RMY N/A

07/16   The low since midnight is 70F, 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 16
HIGH 94F IN 1968, 1980, 1983, 1999
LOW 50F IN 1903
PRECIP 0.98 INS IN 2014
WIND 48e MPH SW 1944

RECORDS FOR JULY 17
HIGH 96F IN 1999
LOW 47F IN 1892
PRECIP 1.39 INS IN 1989
WIND 46 MPH WNW IN 1971

TODAY’S REPORT PREPARED BY: Andrew Swanson

Category: Daily Discussions

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