Sunday, June 18, 2023

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

SUNDAY, JUNE 18, 2023
ALL TIMES ARE IN EASTERN STANDARD TIME (EST)
SUNRISE: 0407E
SUNSET:  1924E

MORE CLOUDS THAN SUN WITH SCATTERED SHOWERS MOVING THROUGH
AGAIN TODAY…

A period of heavy rain moved through the area last evening
leaving 1.88″ of much needed rain in the gauge here at Blue
Hill. The heaviest of the rain fell between 2pm and 5pm,
during which time we picked up 1.29″ of rain!

The rain tapered off after midnight, but clouds remained
over the area right into this afternoon. There are some breaks
in the clouds developing early this afternoon, but sunshine
has still been quite limited so far today. Scattered showers have
continued to move from north to south across the area however,
and we’ve picked up another 0.03″ since 7am this morning.

Temperatures are once again being held down by the cloud cover
and cold pool of air aloft. Readings have only reached the
mid to upper 60s early this afternoon, which is around 10
degrees below the expected high for the date.

The wind has been light once again with only an average speed
of about 8mph. The highest gust so far today occurred just
after 5:30 this morning and was only around 20mph.

Visibility has been decent most of the day in between rain
showers. The view has improved from 50 miles early this morning
to 65 miles by early this afternoon.

The high temperature so far today is 67F, which is 9 degrees
below the normal maximum of 76F. The low since midnight is 56F,
this is 3 degrees below the normal minimum of 59F.

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Today’s Observations:

7 A.M.
Weather: Scattered stratus fractus, broken stratocumulus,
broken altocumulus/altostratus, broken cirrocumulus, virga distant N
Temperature: 59F; Dew Point: 58F; Relative Humidity: 97%
Wind: NW @ 7 kts
Sea-level pressure: 1007.6 mb; 29.75 in. Hg: rising unsteadily
Visibility: 50 miles, thin fog
6-hr Max temp: 59F
6-hr Min temp: 56F
24-hr Precip:  1.88 inches
BHO SA 1155 15 SCT E40 BKN 100 BKN 180 BKN 50 076/59/58/3107/975/
THN F ALQDS VIRGA DSNT N/ 8/779 52020 6001/ 70188 10059 20056

10 A.M.
Weather: Scattered stratus fractus, broken cumulus, overcast
stratocumulus, few breaks in overcast distant NNE-NE, very light
rain showers
Temperature: 62F; Dew Point: 59F; Relative Humidity: 89%
Wind: NNW @ 4 kts, wind light
Sea-level pressure: 1008.8 mb; 29.79 in. Hg: rising, then more slowly
Visibility: 60 miles, lower in scattered showers
3-hr Precip: 0.02 inches
BHO SA 1455 30 SCT E40 BKN 50 OVC 60RW- 088/62/59/3404/979/
FEW BINOVC DSNT NNE-NE HIER CLDS VSBL DSNT NNE-NE VIRGA ALQDS
RW-B18E24B49 PCPN VRY LGT VSBY LWR IN SCT RWS WND LGT/ 8/8//
51012 6002/

1 P.M.
Weather: Broken cumulus, broken stratocumulus, broken altocumulus/
altostratus, broken cirrus, few lower stratocumulus distant NNW-NE
Temperature: 66F; Dew Point: 59F; Relative Humidity: 78%
Wind: NE @ 5 kts, wind light
Sea-level pressure: 1010.1 mb; 29.83 in. Hg: rising, then more slowly
Visibility: 70 miles
6-hr Max temp: 67F
6-hr Min temp: 59F
6-hr Precip:  0.03 inches
BHO SA 1755 E30 BKN 55 BKN 70 BKN 250 BKN 70 101/66/59/0505/983/
FEW LWR SC DSNT NNW-NE VIRGA DSNT NE-SE WND LGT/ 8/571 51013
6003/ 10067 20059

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SUMMARY FOR SATURDAY, JUNE 17, 2023

TEMPERATURE (DEGREES F)
MAX…….64   NORMAL…..76
MIN…….55   NORMAL…..58
MEAN……60   NORMAL…..67

DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………-7
TOTAL DEPARTURE FOR THE MONTH………………..-35 [-2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON: JUL 2022 THRU JUN 2023)
TOTAL HEATING UNITS FOR YESTERDAY…………….5  DEPARTURE……..+3
TOTAL HEATING UNITS FOR THE MONTH……………83  DEPARTURE…….+29
TOTAL HEATING UNITS FOR THE SEASON…………5279  DEPARTURE……-920
TOTAL HEATING UNITS LAST SEASON TO DATE…….5589  DEPARTURE……-310

COOLING DEGREE DAYS (SEASON: JAN 2023 THRU DEC 2023)
TOTAL COOLING UNITS FOR YESTERDAY…………….0  DEPARTURE……..-4
TOTAL COOLING UNITS FOR THE MONTH……………37  DEPARTURE……..-8
TOTAL COOLING UNITS FOR THE SEASON…………..68  DEPARTURE……..-5
TOTAL COOLING UNITS LAST SEASON TO DATE……..106  DEPARTURE…….-38

PEAK WIND GUST (MPH):
Note: Instruments designated #1 = Main Tower, #2 = South Tower,
F420C, Contacting, Merlin, and Richards are all Main Tower.
E=Estimated

F420C (Official)……….E21 NE    @  05:53 P.M.
VECTOR #1 (1-Sec)……….21 NE    @  05:51 P.M.
VECTOR #2 (1-Sec)……….21 NE    @  06:19 P.M.
DAVIS #1……………….20 NE    @  06:19 P.M.
DAVIS #2 ………………20 ENE   @  05:47 P.M.
RMY #1 (Instantaneous)…..21 NE    @  06:19 P.M.
RMY #2 (Instantaneous)…..22 NE    @  06:19 P.M.
MERLIN…………………19 NE
RICHARDS (C5C) (Inst)……19       @  05:52 P.M.

FASTEST MILE:
CONTACTING ANEMOMETER/OFFICIAL………………13 E   @  03:04 P.M.
MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..14     @  05:52 P.M.
MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..15     @  06:18 P.M.
MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………15 E   @  03:02 P.M.
MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………15 NE  @  06:18 P.M.
MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..14 E   @  03:01 P.M.
MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..15 NE  @  06:18 P.M.
MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………14     @  03:01 P.M.

AVERAGE WIND SPEED AND DIRECTION:
CONTACTING/OFFICIAL………. 4.5 SW [109 total miles] VECTOR #1……………….. 5.1
VECTOR #2……………….. 5.3
DAVIS #1………………… 4.6 NE
DAVIS #2………………… 4.6 NE
RMY #1………………….. 5.1 W
RMY #2………………….. 5.2 W
RICHARDS (C5C)…………… 5.7

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST):
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..1.88 DEPARTURE…..+1.71
TOTAL PRECIPITATION FOR THE MONTH…………..3.58 DEPARTURE…..+0.82
TOTAL PRECIPITATION FOR THE YEAR…………..24.33 DEPARTURE…..-1.03

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PRELIMINARY CLIMATE SUMMARY FOR JUNE CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST
PEAK GUST: F420C (Official)
VEC1: Vector #1 1-second gust
RMY:  R.M. Young #1 wind gust recording system (Instantaneous)
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M:    Missing data

6/1   88/56/72/+10/0.00/859/95            21 WSW  VEC1 21 WSW RMY 21
6/2   91/53/72/+10/0.53/634/70            37 ENE  VEC1 39 ENE RMY 37 TSTM
6/3   53/43/48/-14/0.16/000/00            36 NE   VEC1 38 NE  RMY 36
6/4   52/43/48/-15/0.17/009/01            30 N    VEC1 32 N   RMY 29
6/5   58/47/53/-10/0.08/027/03            22 N    VEC1 24 N   RMY 23
6/6   72/50/61/-2/T/582/64                31 NNW  VEC1 31 NNW RMY 26 TSTM
6/7   65/50/58/-6/0.00/301/33             28 NW   VEC1 29 NW  RMY 29
6/8   64/51/58/-6/T/191/21                13 WNW  VEC1 13 WNW RMY 10
6/9   64/49/57/-7/0.47/210/23             20 WNW  VEC1 21 ESE RMY 20 TSTM
6/10  67/51/59/-6/0.05/365/40             26 WNW  VEC1 26 WNW RMY 26 TSTM
6/11  80/55/68/+3/0.00/823/90             23 S    VEC1 24 S   RMY 24
6/12  79/60/70/+5/0.15/439/48             32 SSE  VEC1 33 SSE RMY 31
6/13  78/59/69/+3/0.03/421/46             26 SE   VEC1 27 SE  RMY 24
6/14  78/57/68/+2/0.06/…/..             38 S    VEC1 39 S   RMY 39 TSTM
6/15  77/56/67/+1/0.00/…/..             23 WNW  VEC1 22 WNW RMY 22
6/16  81/61/71/+4/T/…/..                20 W    VEC1 19 SSW RMY 19
6/17  64/55/60/-7/1.86/…/..             21 NE   VEC1 21 NE  RMY 21

6/18  The low since midnight is 56F, the daily normal low is 59F

DAILY RECORDS

06/02/2023: TIED RECORD HIGH MAXIMUM TEMPERATURE OF 91F,
ALSO SET IN 1895

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

RECORDS FOR JUNE 18
HIGH 93F IN 1929, 1994
LOW 39F IN 1920
PRECIP 3.36 INS 1998
PEAK GUST 48e MPH W IN 1943

RECORDS FOR JUNE 19
HIGH 92F IN 1923
LOW 40F IN 1920
PRECIP 3.92 INS 1922
PEAK GUST 66e MPH NW IN 1940

TODAY’S REPORT PREPARED BY: Matt Douglas