Wednesday, October 2, 2019

| October 2, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, OCTOBER 2, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

MOSTLY CLOUDY AND SOME RAIN WITH THE
APPROACHING FRONT….

Today we observed mostly cloudy skies with limited visibility due
to haze and distant afternoon rainfall. The lowest visibility of
ten miles was seen towards Boston, which encountered showers
around the 1 P.M. observation. The highest visibility of 45 miles
was seen at 10 A.M. The observatory encountered some light rain
between 10 and 11 A.M., leaving only a trace in the gauge. Wind
has shifted from SW-NE, with a max gust of 28 mph following the
frontal passage.

The high so far today is 75F, which is 10 degrees above
the normal high of 65F. The low this morning was 68F, which
is 20 degrees above the normal low of 48F.

Today’s Observations:

7 A.M.
Weather: Scattered cumulus, broken altocumulus
Temperature: 70F; Dew Point: 66F; Wind: W at 12 kts, gusting to 20 kts
Sea-level pressure: 29.78 ins. Hg, rising steadily
Visibility: 25 miles, hazy
6-hr Max temp: 70F
6-hr Min temp: 68F
24-hr Precip: 0.00 ins.
BHO SA 1155 20 SCT E140 BKN 25 086/70/66/2612G20/978/ HAZY/ 8/870 53011
10070 20068

10 A.M.
Weather: Broken stratocumulus and altostratus, light
rain beginning at 9:55 A.M.
Temperature: 72F; Dew Point: 67F; Wind: W at 10 kts,
Wind: Light and variable
Sea-level pressure: 29.79 ins. Hg, falling then rising
Visibility: 45 miles, distant haze
3-hr Precip: Trace
BHO SA 1455 E30 BKN 100 BKN 45 090/72/67/2604/979/ DSNT HZ ALQDS R-B55
WND L/V/ 8/820 600// 50004

1 P.M.
Weather: Broken stratocumulus and altostratus, virga
NW-NE
Temperature: 73F; Dew Point: 66F; Wind: NE at 6 kts,
Wind: Light
Sea-level pressure: 29.78 ins. Hg, rising then falling
Visibility: 20 miles, except 10 miles NW-NE
6-hr Max temp: 75F
6-hr Min temp: 70F
6-hr Precip: Trace
BHO SA 1755 E30 BKN 100 BKN 20 085/73/66/0506/978/ VIRGA NW-NE VSBY 10
NW-NE WND LGT/ 8/820 600// 55005 10075 20070

SUMMARY FOR TUESDAY, OCTOBER 1, 2019

TEMPERATURE (DEGREES F)
MAX…..67   NORMAL…..66
MIN…..52   NORMAL…..49
MEAN….60   NORMAL…..57

DEPARTURE FROM 30-YEAR NORMAL………………….+3
TOTAL DEPARTURE FOR THE MONTH………………….+3 [+2.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………5   DEPARTURE………-3
TOTAL HEATING UNITS FOR THE MONTH……………5   DEPARTURE………-3
TOTAL HEATING UNITS FOR THE SEASON………….98   DEPARTURE……..-53
TOTAL HEATING UNITS LAST SEASON TO DATE……..93   DEPARTURE………+5

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………-1
TOTAL COOLING UNITS FOR THE MONTH……………0   DEPARTURE………-1
TOTAL COOLING UNITS FOR THE SEASON…………680   DEPARTURE……..+83
TOTAL COOLING UNITS LAST SEASON TO DATE…….863   DEPARTURE…….-183

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..28 SW   AT 10:40 P.M.
AERO…………………….25 SSW  AT  7:22 P.M.
ASOS…………………….29 SW   AT 10:39 P.M.
DAVIS……………………26 SSW  AT  7:53 P.M. RMY 29
FASTEST MILE FOR YESTERDAY………………….21 SW   AT 10:20 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 SW   AT  9:29 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………20 SSW  AT  7:48 P.M.
AVERAGE WIND SPEED AND DIRECTION……………14.3 SSW
ASOS……………………14.3
DAVIS…………………..13.6 SSW [201 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.06  DEPARTURE……-0.10
ASOS…………..0.06
TOTAL PRECIPITATION FOR THE YEAR……….38.48  DEPARTURE……-0.77
ASOS………….38.35

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/01  73/56/65/-3/0.00/703/89                21 ENE AERO 14 ENE RMY 18
9/02  75/57/66/-2/0.37/165/21                39 W   AERO 41 W   RMY 41
9/03  77/61/69/+2/0.00/643/82                18 S   AERO 16 S   RMY N/A
9/04  83/61/72/+5/0.00/375/48                30 SW  AERO 28 SW  RMY 30
9/05  68/54/61/-6/0.00/513/66                23 NW  AERO 17 NW  RMY N/A
9/06  65/56/61/-6/0.03/054/07                37 ENE AERO 36 ENE RMY 36
9/07  70/51/61/-5/0.27/325/42                37 N   AERO 37 N   RMY N/A
9/08  73/53/63/-3/0.00/631/82                25 W   AERO 21 W   RMY N/A
9/09  71/54/63/-3/0.00/537/70                17 SE  AERO 16 SE  RMY 16
9/10  73/57/65/0/0.00/207/27                 25 S   AERO 25 S   RMY N/A
9/11  83/63/73/+8/0.00/419/55                31 SW  AERO 32 SW  RMY N/A
9/12  70/52/61/-4/0.11/015/02                29 ENE AERO 28 ENE RMY 28
9/13  65/49/57/-7/0.00/741/98                29 ENE AERO 27 ENE RMY 27
9/14  69/49/59/-5/0.19/030/04                36 S   AERO 37 S   RMY 37
9/15  78/62/70/+6/0.00/600/80                24 W   AERO 23 W   RMY 22
9/16  72/54/63/0/0.00/673/90                 25 WNW AERO 23 WNW RMY 25
9/17  67/49/58/-5/0.00/611/82                23 NW  AERO 23 N   RMY N/A
9/18  61/49/55/-7/0.00/…/..                26 NE  AERO 25 NE  RMY 25
9/19  67/43/55/-7/0.00/…/..                17 NE  AERO 18 NE  RMY N/A
9/20  78/50/64/+2/0.00/…/..                21 W   AERO 18 W   RMY 20
9/21  83/60/72/+11/0.00/…/..               21 WNW AERO 18 WNW RMY N/A
9/22  85/62/74/+13/0.00/…/..               24 SW  AERO 23 SW  RMY 25
9/23  88/65/77/+17/0.00/…/..               29 SSW AERO 28 SSW RMY 29
9/24  76/56/66/+6/0.04/…/..                26 W   AERO 26 W   RMY 27
9/25  73/50/62/+2/0.00/…/..                22 W   AERO 21 W   RMY 21
9/26  79/55/67/+8/0.25/…/..                38 SW  AERO 37 SW  RMY 39
9/27  72/50/61/+2/0.00/…/..                23 S   AERO 23 S   RMY 22
9/28  78/55/67/+9/0.00/…/..                31 S   AERO 29 S   RMY 30
9/29  75/53/64/+6/0.00/…/..                24 NW  AERO 23 NW  RMY 23
9/30  62/49/56/-2/0.00/…/..                23 NNE AERO 16 NNE RMY N/A

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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

10/01  67/52/60/+3/0.06/…/..               28 SW  AERO 25 SSW RMY 29

10/02  The low since midnight is 67F, normal daily minimum is 48F

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

RECORDS FOR OCTOBER 2
HIGH 85F IN 1968
LOW 29F IN 1899
PRECIP 1.75 INCHES IN 1984
PEAK GUST 52e MPH S IN 1952, 52 NNW IN 1984

RECORDS FOR OCTOBER 3
HIGH 82F IN 1922
LOW 28F IN 1899
PRECIP 1.76 INCHES IN 1979
PEAK GUST 62 MPH WNW IN 1964

TODAY’S REPORT PREPARED BY: Benjamin Turner and Greg White

Category: Daily Discussions

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