Sunday, September 24, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, SEPTEMBER 24, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

CLEAR SKIES BUT HAZY CONDITIONS

High pressure continues to build over southern New England.
Skies have been mostly sunny all day and completely clear of
clouds in the late morning and early afternoon.  Visibility
only measured 35-40 miles today due to distant haze, and winds
have been quite light this afternoon.  Temps. have been well
above normal with a max. of 84F by 1:00PM EST. The average temp.
so far for today is 74F which is 14F above normal.

Today’s Observations:

7 A.M.
Weather: Few cirrus E
Temperature: 67F; Dew Point: 61F; Wind: N at 9 kts
Sea-level pressure: 30.09 ins. Hg, rising, then more slowly
Visibility: 40 miles, distant haze in all directions
6-hr Max temp: 67F
6-hr Min temp: 63F
24-hr precip: 0.00 in.
BHO SA 1155 CLR 40 189/67/61/0109/009/ FEW CI E DSNT HZ ALQDS/
8/001 51011 10067 20063

10 A.M.
Weather: Sky clear
Temperature: 79F; Dew Point: 65F; Wind: estimated NE at 3 kts,
Wind speed: Light
Sea-level pressure: 30.09 ins. Hg, steady, then falling slightly
Visibility: 35 miles, distant haze in all directions
BHO SA 1455 CLR 35 189/79/65/E0503/009/ SKC DSNT HZ ALQDS
WND LGT/ 50000

1 P.M.
Weather: Sky clear
Temperature: 84F; Dew Point: 65F; Wind: estimated NNE at 3 kts,
Wind speed: Light
Sea-level pressure: 30.07 ins. Hg, falling unsteadily
Visibility: 35 miles, distant haze in all directions
6-hr Max temp: 84F
6-hr Min temp: 66F
BHO SA 1755 CLR 35 183/84/65/E0303/007/ SKC DSNT HZ ALQDS
WND LGT/ 57006 10084 20066

SUMMARY FOR SATURDAY, SEPTEMBER 23, 2017

TEMPERATURE (DEGREES F)
MAX…..74   NORMAL…..69
MIN…..59   NORMAL…..52
MEAN….67   NORMAL…..60

DEPARTURE FROM 30-YEAR NORMAL…………………….+7
TOTAL DEPARTURE FOR THE MONTH……………………+26 [+0.9 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………2   DEPARTURE……….+1
TOTAL COOLING UNITS FOR THE MONTH…………..60   DEPARTURE……….+6
TOTAL COOLING UNITS FOR THE SEASON…………667   DEPARTURE………+76
TOTAL COOLING UNITS LAST SEASON TO DATE…….894   DEPARTURE……..-227

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE……….-6
TOTAL HEATING UNITS FOR THE MONTH…………..42   DEPARTURE………-26
TOTAL HEATING UNITS FOR THE SEASON………….68   DEPARTURE………-25
TOTAL HEATING UNITS LAST SEASON TO DATE……..17   DEPARTURE………+51

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….29 NNE AT 12:38 A.M.
AERO……………………29 NNE AT 12:39 A.M.
ASOS……………………33 NNE AT 12:40 A.M.
DAVIS…………………..28 NNE AT 12:38 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………18  N  AT  1:07 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………20 NNE AT  2:10 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..17  N  AT  1:07 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.5 NNE
ASOS…………………..9.6
DAVIS………………….8.1 NNE [033 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….3.17  DEPARTURE……+0.15
ASOS…………..3.24
TOTAL PRECIPITATION FOR THE YEAR……….39.53  DEPARTURE……+1.49
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

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  68/47/58/-10/0.00/749/95              26 WNW AERO 28 WNW RMY 31
9/2  72/46/59/-9/0.00/542/69               18 NNW AERO 18 NNW RMY 21
9/3  63/52/58/-9/0.24/000/00               33 W   AERO 33 W   RMY 37
9/4  79/55/67/0/0.00/702/90                29 SSW AERO 28 SSW RMY N/A
9/5  84/62/73/+6/0.00/583/75               36 S   AERO 32 S   RMY 38
9/6  76/59/68/+1/0.49/070/09               28 S   AERO 28 S   RMY 30 TSTM
9/7  74/58/66/0/0.79/417/54                24*WSW AERO 23 WSW RMY 24
9/8  74/53/64/-2/0.00/577/75               21 WSW AERO 18 WSW RMY 22
9/9  68/51/60/-5/T/620/81                  18 ENE AERO 16 ENE RMY 18
9/10 71/51/61/-4/0.00/694/91               18 NW  AERO 16 NW  RMY N/A
9/11 78/50/64/-1/0.00/692/91               20 NNW AERO 17 NNW RMY 20
9/12 84/58/71/+6/0.00/690/91               22 WSW AERO 18 WSW RMY 23
9/13 84/59/72/+8/T/680/90                  18 WSW AERO 15 WSW RMY 20 TSTM
9/14 82/66/74/+10/0.00/233/31              23 SW  AERO 23 WSW RMY 25 TSTM
9/15 83/66/75/+11/0.05/300/40              18 WNW AERO 15 WNW RMY 18
9/16 78/65/72/+9/T/…/..                  14 E   AERO  9 E   RMY 12
9/17 79/61/70/+7/T/…/..                  15 SSE AERO 14 SSE RMY 15
9/18 67/62/65/+3/…./…/..               21 NE  AERO 18 NE  RMY N/A
9/19 63/61/62/0/…./…/..                28 NE* AERO 25 NNE RMY N/A
9/20 68/62/65/+3/…./…/..               41 NNE AERO 44 NNE RMY 45
9/21 69/60/65/+4/…./…/..               47 NNE AERO 44 NNE RMY 50
9/22 60/54/57/-4/…./…/..               40 NNE AERO 38 NNE RMY N/A
9/23 74/59/67/+7/…./…/..               29 NNE AERO 29 NNE RMY N/A

9/24 Low temp since midnight is 63F; normal low is now 52F

DAILY RECORDS FOR SEPTEMBER

9/1/17: DAILY RECORD LOW MINIMUM TEMPERATURE OF 47F,
TIES PREVIOUS RECORD SET IN 1975

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

RECORDS FOR SEPTEMBER 24
HIGH 87F IN 1959
LOW 33F IN 1885,1950,1963
PRECIP 1.19 INCHES IN 1955
PEAK GUST 54e MPH SW IN 1940

RECORDS FOR SEPTEMBER 25
HIGH 87F IN 1970
LOW 31F IN 1950
PRECIP 2.68 INCHES IN 1961
PEAK GUST 63 MPH SSW IN 1991

TODAY’S REPORT PREPARED BY: Cecilia Borries-Strigle