Thursday, September 22, 2016

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, SEPTEMBER 22, 2016
ALL TIMES ARE IN EASTERN STANDARD TIME

UNSEASONABLY WARM TEMPERATURES CONTINUE ON FIRST DAY OF FALL

Temperatures continue to be above normal as a max. of 82F occurred by the
1:00PM EST observation.  This is 13F above the average high temperature of
69F.  The previous two days have also seen temperatures 12F above the normal
daily average.

High pressure continued to bring dry conditions and mostly clear skies today.
Winds were light and out of the N-NE.  Today’s updated US Drought Monitor
still shows no change in the extreme drought conditions affecting most of the
state.  Blue Hill Observatory is currently 1.26 in. below normal for the month
and 11.31 in. below normal for the year.

7 A.M.
Weather: Few cirrostratus in all directions
Temperature: 68F; Dew Point: 51F; Wind: N at 8 kts
Sea-level pressure: 30.19 ins. Hg, rising, then more quickly
Visibility: 80 miles
6-hr Max temp: 68F
6-hr Min temp: 63F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 80 223/68/51/0108/019/ FEW CS ALQDS/ 8/005 51009 10068 20063

10 A.M.
Weather: Few cirrostratus ENE-SSE, few cirrus in all directions
Temperature: 80F; Dew Point: 51F; Wind: NE at 6 kts,
Wind Speed: Light
Sea-level pressure: 30.20 ins. Hg, rising then falling
Visibility: 70 miles
BHO SA 1455 CLR 70 228/80/51/0506/020/ FEW CS ENE-SSE FEW CI ALQDS WND LGT/
8/001 50005

1 P.M.
Weather: Few cirrus in all directions
Temperature: 81F; Dew Point: 53F; Wind: NNE at 8 kts
Sea-level pressure: 30.15 ins. Hg, falling, then less quickly
Visibility: 70 miles
6-hr Max. temp: 82F
6-hr Min. temp: 69F
6-hr precip: 0.00 in.
BHO SA 1755 CLR 70 211/81/53/0308/015/ FEW CI ALQDS/ 8/001 56017 10082 20069

SUMMARY FOR WEDNESDAY, SEPTEMBER 21, 2016

TEMPERATURE (DEGREES F)
MAX…..81   NORMAL…..70
MIN…..64   NORMAL…..53
MEAN….73   NORMAL…..61

DEPARTURE FROM 30-YEAR NORMAL…………………..+12
TOTAL DEPARTURE FOR THE MONTH…………………..+88 [+4.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………8   DEPARTURE……….+7
TOTAL COOLING UNITS FOR THE MONTH…………..92   DEPARTURE………+40
TOTAL COOLING UNITS FOR THE SEASON…………884   DEPARTURE……..+295
TOTAL COOLING UNITS LAST SEASON TO DATE…….797   DIFFERENCE……..+87

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……….-5
TOTAL HEATING UNITS FOR THE MONTH……………6   DEPARTURE………-51
TOTAL HEATING UNITS FOR THE SEASON………….16   DEPARTURE………-66
TOTAL HEATING UNITS LAST SEASON TO DATE……..13   DIFFERENCE………+3

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….20 WNW AT  5:26 A.M.
ASOS……………………19 NW  AT  6:07 A.M.
DAVIS…………………..18 WNW AT  5:26 A.M. RMY 18
FASTEST MILE FOR YESTERDAY…………………15 NW  AT  6:05 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………15 NW  AT  6:09 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..14 WNW AT  5:26 A.M.
AVERAGE WIND SPEED AND DIRECTION………….9.1 WNW
ASOS…………………..9.5
DAVIS………………….7.9 WNW [300 Deg.] * Last of several occurrences

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……….1.47  DEPARTURE……-1.26
ASOS…………..1.47
TOTAL PRECIPITATION FOR THE YEAR……….26.44  DEPARTURE…..-11.31
ASOS………….26.74

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

9/1  72/64/68/0/0.09/000/00                  21 NNW AERO 16 NNW RMY 20
9/2  76/58/67/-1/0.00/738/94                 23 ENE AERO 17 NE  RMY 23
9/3  72/56/64/-3/0.00/368/47                 16 E   AERO 12 E   RMY N/A
9/4  71/58/65/-2/0.00/740/95                 28 NE  AERO 21 NE  RMY 27
9/5  73/57/65/-2/0.52/241/31                 42 NNE AER0 33 NNE RMY 43
9/6  70/61/66/-1/0.54/046/06                 32 N   AERO 23 NNE RMY N/A
9/7  78/66/72/+6/0.05/339/44                 21 NE* AERO 15 NE* RMY 21
9/8  79/65/72/+6/T/276/36                    22 S   AERO 15 S   RMY 23
9/9  90/69/80/+14/T/421/55                   23 W   AERO 24 W   RMY 25
9/10 82/71/77/+12/T/229/30                   25 S   AERO 18 S   RMY 32
9/11 79/59/69/+4/0.10/365/48                 39 WNW AERO 30 WNW RMY 43
9/12 76/53/65/0/0.00/749/99                  18 SW* AERO 13 WNW RMY 19
9/13 81/57/69/+5/0.00/739/98                 25 SSW AERO  M     RMY 26
9/14 87/58/73/+9/T/526/70                    35 NNW AERO  M     RMY 35
9/15 67/52/60/-4/0.00/531/71                 21 NE  AERO  M     RMY 20
9/16 74/54/64/+1/0.00/567/76                 23 SSE AERO  M     RMY 24
9/17 77/54/66/+3/0.00/…/..                 28 S   AERO  M     RMY 28
9/18 79/63/71/+9/T/…/..                    30 SW  AERO  M     RMY 33
9/19 73/67/70/+8/0.16/…/..                 25 S   AERO  M     RMY N/A
9/20 81/66/74/+12/0.00/…/..                16 WSW*AERO  M     RMY N/A
9/21 81/64/73/+12/T/…/..                   20 WNW AERO  M     RMY 18

9/22 Low temp since midnight is 63F; normal low is now 52F

DAILY RECORDS FOR SEPTEMBER 2016

9/10/16: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 71F,
BREAKS PREVIOUS RECORD OF 69F SET IN 1915, 1931, AND 1989

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

RECORDS FOR SEPTEMBER 22
HIGH 90F IN 1895, 1914
LOW 30F IN 1904 (Earliest freeze)
PRECIP 1.16 INCHES IN 2001
PEAK GUST 60 MPH SSW IN 1989

RECORDS FOR SEPTEMBER 23
HIGH 93F IN 1895,1914
LOW 33F IN 1904
PRECIP 2.67 INCHES IN 1994
PEAK GUST 62 MPH SSW IN 1989

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle