Sunday, September 29, 2019

| September 29, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 29, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR WEATHER DAY WITH PASSING CLOUDS, HIGH PRESSURE, AND
WARM TEMPERATURES….

Besides a few passing clouds, weather has been beautiful and sunny
today. Visibility remains excellent at about 80 miles, and has been
excellent since 7 this morning. The high temperature so far is 75F,
which is 8 degrees above the normal maximum temperature of 67F, and
the low since midnight is 64F, which is 15 degrees above our normal
minimum temperature of 49F.

Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus and cirrus in all directions
Temperature: 65F; Dew Point: 54F; Wind: NNW at 10 kts
Sea-level pressure: 30.20 ins. Hg, rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 66F
6-hr Min temp: 64F
24-hr Precip: 0.00 ins.
BHO SA 1155 CLR 80 228/65/54/3310/020/ FEW SC ALQDS FEW CI
ALQDS/ 8/402 51036 10066 20064

10 A.M.
Weather: Broken stratocumulus, broken cirrus
Temperature: 70F; Dew Point: 54F; Wind: N at 8 kts
Sea-level pressure: 30.25 ins. Hg, rising, then more slowly
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E40 BKN E250 BKN 80 245/70/54/3508/025/ 8/401 51017

1 P.M.
Weather: Scattered cumulus, scattered cirrus
Temperature: 74F; Dew Point: 52F; Wind: NNW at 7 kts
Sea-level pressure: 30.24 ins. Hg, falling, then more slowly
Visibility: 80 miles
6-hr Max temp: 75F
6-hr Min temp: 65F
6-hr Precip: 0.00 ins.
BHO SA 1755 40 SCT 250 SCT 80 240/74/52/3407/024/ 8/101
58005 10075 20065

SUMMARY FOR SATURDAY, SEPTEMBER 28, 2019

TEMPERATURE (DEGREES F)
MAX…..78   NORMAL…..67
MIN…..55   NORMAL…..50
MEAN….67   NORMAL…..58

DEPARTURE FROM 30-YEAR NORMAL………………….+9
TOTAL DEPARTURE FOR THE MONTH…………………+28 [+0.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON AUG TO JUL)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-7
TOTAL HEATING UNITS FOR THE MONTH…………..71   DEPARTURE……..-30
TOTAL HEATING UNITS FOR THE SEASON………….83   DEPARTURE……..-43
TOTAL HEATING UNITS LAST SEASON TO DATE……..76   DEPARTURE………+7

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………2   DEPARTURE………+1
TOTAL COOLING UNITS FOR THE MONTH…………..58   DEPARTURE………-1
TOTAL COOLING UNITS FOR THE SEASON…………680   DEPARTURE……..+84
TOTAL COOLING UNITS LAST SEASON TO DATE…….863   DEPARTURE…….-183

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..31 S   AT 12:18 P.M.
AERO…………………….29 S   AT 12:40 P.M.
ASOS…………………….32 S   AT 12:18 P.M.
DAVIS……………………31 S   AT  2:07 P.M. RMY 30
FASTEST MILE FOR YESTERDAY………………….23 S   AT 12:11 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 SSW AT  2:13 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 SSW AT  2:12 P.M.
AVERAGE WIND SPEED AND DIRECTION…………….14.2 SSW
ASOS…………………….14.3
DAVIS……………………13.3 SSW [203 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.15
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.27  DEPARTURE……-2.49
ASOS…………..1.19
TOTAL PRECIPITATION FOR THE YEAR……….38.42  DEPARTURE……-0.37
ASOS………….38.23

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  The low since midnight is 64F, normal daily minimum is 50F

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

RECORDS FOR SEPTEMBER 29
HIGH 85F IN 1952
LOW 28F IN 1914 (SEPTEMBER MINIMUM RECORD)
PRECIP 2.61 INCHES IN 1907
PEAK GUST 62 MPH S IN 2005

RECORDS FOR SEPTEMBER 30
HIGH 84F IN 1986
LOW 31F IN 1992
PRECIP 2.44 INCHES IN 2015
PEAK GUST 58 MPH SSE IN 1999

TODAY’S REPORT PREPARED BY: Samantha Richard

Category: Daily Discussions

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