Tuesday, July 27, 2021

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

TUESDAY, JULY 27, 2021
ALL TIMES ARE IN EASTERN STANDARD TIME
SUNRISE: 0432E
SUNSET:  1909E

WARM AND HUMID AGAIN TODAY WITH PLENTY OF SUNSHINE THROUGH
EARLY AFTERNOON….

Plenty of sun has been observed through early this
afternoon with some high thin cirrus and a few cumulus
this afternoon. Most of the smoke from yesterday has
departed the area, however a very thin layer of it can
still be detected aloft.

A westerly breeze has helped to push the temperatures
into the upper 80s and low 90s across the region.

Humidity levels have been gradually increasing during the
day, starting in the low 60s this morning and reaching
the mid 60s by early afternoon. An increase in low level
moisture will continue into this evening as moisture pools
ahead of a cold front which is forecast to push through
overnight.

The high so far today is 87F, 5 degrees above the daily
normal maximum of 82F. The low so far today is 66F, which
is 2 degrees above the daily normal minimum of 64F.

———————————————–

Today’s Observations:

7 A.M.
Weather: Thin broken cirrus
Temperature: 70F; Dew Point: 62F; Relative Humidity: 76%
Wind: WNW @ 5 kts, wind light
Sea-level pressure: 29.95 in. Hg; rising, then more slowly
Visibility: 10 miles, hazy
6-hr Max temp: 70F
6-hr Min temp: 66F
24-hr Precip: 0.00 ins.
BHO SA 1155 E250 -BKN 10 142/70/62/2905/995/ HAZY WND LGT/
8/001 51012 10070 20066

10 A.M.
Weather: Thin broken cirrus
Temperature: 80F; Dew Point: 63F; Relative Humidity: 69%
Wind: WSW @ 3 kts, wind light and variable
Sea-level pressure: 29.97 in Hg; rising, then more rapidly
Visibility: 20 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 E250 -BKN 20 150/80/63/2503/997/ THN K LYR ALF
HAZY WND L/V/ 8/001 53008


1 P.M.
Weather: Scattered cumulus, thin broken cirrus
Temperature: 86F, Dew point: 64F; Relative Humidity: 49%
Wind: W @ 9 kts  
Sea-level pressure: 29.94 in Hg; falling, then more rapidly
Visibility: 20 miles, hazy
6-hr Max temp: 87F
6-hr Min temp: 70F
6-hr Precip: 0.00 ins.
BHO SA 1755 50 SCT E250 -BKN 20 139/86/64/2809/994/ HAZY/
8/201 58011 10087 20070


SUMMARY FOR MONDAY, JULY 26, 2021

TEMPERATURE (DEGREES F)
MAX…….87     NORMAL…..82
MIN…….67     NORMAL…..64
MEAN……77     NORMAL…..73

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL……….+4
TOTAL DEPARTURE FOR THE MONTH…………………-91 [-3.7 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…….+20
TOTAL HEATING UNITS FOR THE SEASON…………..26  DEPARTURE…….+20
TOTAL HEATING UNITS LAST SEASON TO DATE……….1  DEPARTURE…….+25

COOLING DEGREE DAYS (SEASON: JAN 2021 THRU DEC 2021)
TOTAL COOLING UNITS FOR YESTERDAY……………12  DEPARTURE……..+4
TOTAL COOLING UNITS FOR THE MONTH…………..133  DEPARTURE…….-73
TOTAL COOLING UNITS FOR THE SEASON………….359  DEPARTURE…….+14
TOTAL COOLING UNITS LAST SEASON TO DATE……..408  DEPARTURE…….-49

PEAK WIND GUST (MPH):
                     Official……………….27 WSW @  1:12 P.M.
                     AEROVANE (south tower)…..25 WNW @  3:37 P.M.
                     VECTOR #2 (south tower)….29     @  1:12 P.M.
                     DAVIS #2 (south tower)…..26 W   @  1:13 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………………17 W   @  3:00 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..18     @  3:36 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………18 WNW @  3:37 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…… 8.8 W  [212 total miles]                     VECTOR #2……………. 9.8
                     DAVIS #2…………….. 9.8 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…….0.00  DEPARTURE….-0.11
TOTAL PRECIPITATION FOR THE MONTH…………10.77  DEPARTURE….+7.89
TOTAL PRECIPITATION FOR THE YEAR………….34.15  DEPARTURE….+4.30


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/-2/0.16/…/..           26 NNW AERO 23 NNW  RMY N/A TSTM
07/22   79/58/69/-4/T/…/..              20 WNW AERO 20 WNW  RMY N/A
07/23   79/62/71/-2/0.00/…/..           22 S   AERO 21 S    RMY N/A TSTM
07/24   78/59/69/-4/0.00/…/..           19 S   AERO 18 S    RMY N/A
07/25   71/64/68/-5/0.08/…/..           40 SSW AERO 41 SSW  RMY N/A
07/26   87/67/77/+4/0.01/…/..           27 WSW AERO 25 WNW  RMY N/A

07/27 The low since midnight is 66F, 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 27
HIGH 95F IN 1949, 1963
LOW 50F IN 1920, 2001
PRECIP 4.01 INS IN 1979
WIND 47 MPH ENE IN 1984

RECORDS FOR JULY 28
HIGH 97F IN 1931
LOW 49F IN 1903
PRECIP 3.32 INS IN 1911
PEAK GUST 62 MPH SW IN 2006

TODAY’S REPORT PREPARED BY: Matt Douglas