Friday, June 12, 2020

| June 12, 2020 | Reply

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

FRIDAY, JUNE 12, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

FOGGY START, SPECTACULAR FINISH ATOP GREAT
BLUE HILL…

We observed sector visibility early this morning-
40 miles to the north and only 2 miles to the
south. That fog was quickly eroded by increasing
sunshine and a drying westerly wind. That wind direction
allowed dew points to find their way from the mid-60s
to the mid-50s by early afternoon yielding an increase in
visibility to 50 miles. We only noted a max gust of
12 MPH through much of the morning, but pushing to
29 MPH by 1PM.

Yesterday’s storms delivered a healthy 0.62 inches
of rain ushering us out of a monthly deficit into
positive territory (+0.10 inches), though this appears
it will be short-lived given the precipitation outlook.

The high so far today is 80 degrees, this is 6
degrees above the daily normal high of 74F. The
low since midnight is 66F, which is 10 degrees
above the daily normal low of 56F.

Today’s Observations:

7 A.M.
Weather: Broken Stratus Fractus, Broken Altocumulus, Broken
Cirrus
Temperature: 68F; Dew Point: 65F; Relative Humidity: 89%
Wind: WSW at 6 kts
Sea-level pressure: 30.10 ins. Hg: rising, then steady
Visibility: 40 miles (except E-SW 2 miles, fog)
6-hr Max temp: 68F
6-hr Min temp: 66F
24-hr Precip:  0.62 ins
24-hr Snowfall: 0.0 ins.
BHO SA 1155 E070 BKN E65 BKN E250 BKN 40 193/68/65/2506/010/
VSBY E-SW 2 FOG E-SW/ 8/781 51004 70062 10068 20066

10 A.M.
Weather: Broken Altocumulus (few cumulus, few cirrus)
Temperature: 75F; Dew Point: 55F; Relative Humidity: 51%
Wind: W at 10 kts
Sea-level pressure: 30.07 ins. Hg: steady, then falling
Visibility: 50 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 E90 BKN 50 184/75/55/2610/007/ FEW CU E-S
FEW CI SE-SW/ 8/262 58006

1 P.M.
Weather: Scattered Cumulus, Scattered Cirrostratus (NE-SSE)
Temperature: 79F; Dew Point: 55F; Relative Humidity: 44%
Wind: WSW 11G19 kts
Sea-level pressure: 30.02 ins. Hg: falling, then more rapidly
Visibility: 50 miles
6-hr Max temp: 80F
6-hr Min temp: 66F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 40 SCT 250 SCT 50 166/79/55/2411G19/002/
SCT CS DSNT NE-SSE HAZY/ 8/206 58018 10080 20066

SUMMARY FOR THURSDAY, JUNE 11, 2020

TEMPERATURE (DEGREES F)
MAX…..71   NORMAL…..74
MIN…..64   NORMAL…..56
MEAN….68   NORMAL…..65

DEPARTURE FROM 30-YEAR NORMAL………………+3
TOTAL DEPARTURE FOR THE MONTH……………..+28 [+2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-3
TOTAL HEATING UNITS FOR THE MONTH……………24  DEPARTURE…….-19
TOTAL HEATING UNITS FOR THE SEASON…………5836  DEPARTURE……-510
TOTAL HEATING UNITS LAST SEASON TO DATE…….6234  DEPARTURE……-398

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………… 3  DEPARTURE…….. 0
TOTAL COOLING UNITS FOR THE MONTH……………34  DEPARTURE…….+10
TOTAL COOLING UNITS FOR THE SEASON…………..66  DEPARTURE…….+18
TOTAL COOLING UNITS LAST SEASON TO DATE………29  DEPARTURE…….+37

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..40 S   AT  8:50 A.M.
AERO…………………….40 S   AT  8:56 A.M.
ASOS…………………….41 S   AT  8:38 A.M.
DAVIS……………………40 S   AT 11:57 A.M. RMY 42
FASTEST MILE FOR YESTERDAY………………….32 S   AT  8:41 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….31 S   AT  8:41 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………30 S   AT  8:41 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..17.3 S
ASOS…………………..16.8
DAVIS………………….16.0 SSW [198 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.62  DEPARTURE……+0.46
ASOS…………..0.64
TOTAL PRECIPITATION FOR THE MONTH……….1.91  DEPARTURE……+0.10
ASOS…………..1.91
TOTAL PRECIPITATION FOR THE YEAR……….21.70  DEPARTURE……-2.77
ASOS………….22.22

PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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  64/42/53/-9/T/0.0/…/..            28 WNW  AERO 29 WNW RMY 28
06/02  72/45/59/-3/…./0.0/…/..         28 W    AERO 27 W   RMY 28
06/03  79/55/67/+5/T/0.0/…/..            29 W    AERO 28 W   RMY 26
06/04  87/62/75/+12/…./0.0/…/..        26 W    AERO 25 S   RMY N/A
06/05  80/65/73/+10/…./0.0/…/..        28 SSW  AERO 28 SSW RMY N/A TSTM
06/06  86/57/72/+9/…./0.0/…/..         55 SW   AERO 59 SW  RMY 59  TSTM
06/07  68/54/61/-3/0.00/0.0/…/..         24 NW   AERO 24 NW  RMY N/A
06/08  77/51/64/0/0.00/0.0/…/..          25 W    AERO 24 W   RMY 25
06/09  77/60/69/+5/T/…/..                23 E    AERO 21 E   RMY N/A
06/10  70/58/64/-1/T/0.0/…/..            25 E    AERO 24 E   RMY N/A
06/11  71/64/68/+3/0.62/0.0/…/..         40 S    AERO 40 S   RMY 42

06/12 The low since midnight is 66F, the daily normal low is 56F

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

RECORDS FOR JUNE 12
HIGH 94F IN 2017
LOW 40F IN 1906
PRECIP 1.79 INS 1955
PEAK GUST 58 MPH NW IN 1991

RECORDS FOR JUNE 13
HIGH 93F IN 1988
LOW 43F IN 1982
PRECIP 6.07 INS 1998 [Record for month]
PEAK GUST 69 MPH N IN 1956

TODAY’S REPORT PREPARED BY: Andrew Swanson

Category: Daily Discussions

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