Thursday, July 8, 2021

| July 8, 2021 | Reply

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

THURSDAY, JULY 8, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0416E
SUNSET:  1923E

RISE AND REPEAT- ANOTHER DAY OF CLOUDS AND INCOMING AFTERNOON
STORMS…

Two lines of storms cruised their way through the area within
the past 24 hours. The first batch yesterday evening  delivered
frequent cloud to ground lightning (even taking out our Davis #1 
anemometer!) and a peak gust of 63 MPH at 6:27 PM! This set
a new daily wind record for the 7th, beating the old speed
of 55 MPH in 1989. 

The second batch rolled in during the wee hours this morning
dumping another round of rain, wind, and lightning. Total
accumulated rainfall amounted to 1.11 inches. Monthly sum is
now a whopping 5.75 inches…one of the wettest beginnings
to July on record! Current radar looks active to our distant
southwest, so we anticipate our rain gauge (yet again) to collect
more precip later today as Elsa meanders northeastward. 

The heat and humidity have taken a break today after 2-consecutive
days near 90F. Temperatures have hung in the mid-60s thanks to
a wind shift off the water. Dew points have responded as well,
slipping into the upper-50s.

Visibility continues to be poor. We’ve only been able to see
20-30 miles.

The high so far today is 67F, 14 degrees below the daily average
of 81F. The low so far today is 59F, 4 degrees below the daily
average of 63F.
 

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: Scattered Stratocumulus, Broken Altostratus, (thin)
Broken Cirrus
Temperature: 62F; Dew Point: 59F; Relative Humidity: 88%
Wind: ENE @ 16G20 kts
Sea-level pressure: 30.06 in. Hg; Rising, then rising more slowly
Visibility: 20 miles, hazy
6-hr Max temp: 65F
6-hr Min temp: 59F
24-hr Precip: 1.11 ins.
BHO SA 1155 50 SCT 180 BKN 250 -BKN 20 180/62/59/0616G20/006/
HAZY/ 8/412 51019 70111 10065 20059

10 A.M.
Weather: Scattered Stratocumulus, Overcast Stratus
Temperature: 65F; Dew Point: 58F; Relative Humidity: 78%
Wind: ENE @ 12G19 kts
Sea-level pressure: 30.10 in Hg; Rising unsteadily
Visibility: 30 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 25 SCT 30 OVC 30 193/65/58/0612G19/010/ HAZY/ 8/4// 52015


1 P.M.
Weather: Scattered Stratocumulus, Overcast Stratus
Temperature: 65F, Dew point: 60F; Relative Humidity: 82%
Wind: ENE @ 12G17 kts
Sea-level pressure: 30.10 in Hg; Rising, then falling
Visibility: 30 miles, hazy
6-hr Max temp: 67F
6-hr Min temp: 62F
6-hr Precip: 0.00 ins.
BHO SA 1755 25 SCT 30 OVC 30 192/65/60/0612G17/010/ HAZY/ 8/4// 58001 10067 20062


SUMMARY FOR WEDNESDAY, JULY 7, 2021

TEMPERATURE (DEGREES F)
MAX…….88     NORMAL…..81
MIN…….66     NORMAL…..63
MEAN……77     NORMAL…..72

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……… +5
TOTAL DEPARTURE FOR THE MONTH…………………-36 [-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……………21  DEPARTURE…….+19
TOTAL HEATING UNITS FOR THE SEASON…………..21  DEPARTURE…….+19
TOTAL HEATING UNITS LAST SEASON TO DATE……….0  DEPARTURE…….+21

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY……………12  DEPARTURE…….+4
TOTAL COOLING UNITS FOR THE MONTH……………32  DEPARTURE……-17
TOTAL COOLING UNITS FOR THE SEASON………….258  DEPARTURE……+70
TOTAL COOLING UNITS LAST SEASON TO DATE……..219  DEPARTURE……+39

PEAK WIND GUST (MPH):
                     420C/Official…………..63 NW  @ 6:27 P.M.
                     AEROVANE (south tower)…..75 NW  @ 6:27 P.M.
                     VECTOR #1………………70     @ 6:27 P.M.
                     VECTOR #2 (south tower)….76     @ 6:27 P.M.
                     DAVIS #2 (south tower)…..58 NW  @ 6:22 P.M.
                     RMY……………………70     @ 6:27 P.M.
                     MERLIN…………………61
                     ASOS………..OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1…….DEFECTIVE D/T LIGHTNING STRIKE

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………41 NW  @  6:28 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..41     @  6:28 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………49 NW  @  6:29 P.M.
MAXIMUM 2-MINUTE RMY AVERAGE………………..41 NW  @  6:28 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……..OUT OF SERVICE D/T RENOVATIONS MAXIMUM 2-MINUTE DAVIS #1 AVERAGE….DEFECTIVE D/T LIGHTNING STRIKE

AVERAGE WIND SPEED AND DIRECTION:
                     CONTACTING/OFFICIAL……8.3 W  [200 total miles]
                     VECTOR #1…………….9.2
                     DAVIS #2……………..9.2 W
                     RMY………………….8.9 W
                     ASOS…………………OUT OF SERVICE D/T RENOVATIONS
                     DAVIS #1……………..DEFECTIVE D/T LIGHTNING STRIKE

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…….1.11  DEPARTURE….+1.01
TOTAL PRECIPITATION FOR THE MONTH………….5.75  DEPARTURE….+4.98
TOTAL PRECIPITATION FOR THE YEAR………….29.13  DEPARTURE….+1.39
     


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
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/+5/0.24/…/..           37 W   AERO 48 W     RMY 38 TSTM
07/07   88/88/77/+5/…/…/..            63 NW  AERO 75 NW    RMY 70 TSTM

07/08 The low since midnight is 59F, the daily normal low is 63F

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 8
HIGH 95F IN 1981
LOW 50F IN 1919
PRECIP 1.74 INS IN 1916
PEAK GUST 46e SSW IN 1941

RECORDS FOR JULY 9
HIGH 98F IN 1912
LOW 47F IN 1909
PRECIP 3.74 INS IN 1921
WIND 46 MPH NW IN 1992

TODAY’S REPORT PREPARED BY: Andrew Swanson

Category: Daily Discussions

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