Wednesday, October 25, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, OCTOBER 25, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

LOW PRESSURE BRINGS RAIN AND HIGH WINDS
TO GREAT BLUE HILL

As the pressure continues to fall, we have had a strong
wind gust from the south/southeast and a peak gust of
44 kts (51 MPH) so far today. Skies remained overcast
with stratus throughout the day. The morning started with
fog that limited visibility to 1/2 mile. The fog began
lifting allowing us to see 30 miles by 1:00 PM EST.
An overnight down pour left 1.26 ins. of precipitation
on top of Great Blue Hill. An additional 0.13 ins. was
measured by 1:00 PM EST. With winds from the south,
temperatures continue to be above seasonable with
a high of 67F by 1:00 PM EST. This is 10 degrees
above the normal of 57F. So far for the month of
October we are in the top three warmest for average
maximum temperatures and the warmest on record for
average minimum temperatures through the 24th.

The minimum temperature on the 24th of 64F was not only
a new record for the date, surpassing the previous record
of 61F set in 2001, it was also the highest daily minimum
temperature ever recorded at Blue Hill so late in the season.

Today’s Observations:

7 A.M.
Weather: Overcast stratus, fog and light drizzle
Temperature: 66F; Dew Point: 66F; Wind: S at 7 kts
Sea-level pressure: 29.75 ins. Hg, falling, then more slowly
Visibility: 1/2 mile
6-hr Max temp: 69F
6-hr Min temp: 64F
24-hr precip: 1.31 ins.
BHO SA 1155 E4 OVC 1/2L-F 074/66/66/1707/975/ PCPN VRY
LGT/ 8/6// 57002 MANUAL 70131 ASOS 70138 10069 20064

10 A.M.
Weather: Overcast stratus, fog and rain
Temperature: 66F; Dew Point: 66F; Wind: S at 14 kts
Sea-level pressure: 29.74 ins. Hg, rising then falling
Visibility: 5 miles
3-hr precip: 0.01 ins.
BHO SA 1455 E6 OVC 5RF 070/66/66/1714/974/ VSBY N-NNE 2/
8/6// 57004 MANUAL 6001/ ASOS 60002

1 P.M.
Weather: Overcast stratus, few stratus fractus
drifting below summit SSW-NNE, line of clearing
along horizon WNW-S, light drizzle
Temperature: 62F; Dew Point: 61F; Wind: SW at 7 kts
Sea-level pressure: 29.72 ins. Hg, steady then falling
Visibility: 30 miles distant fog in all directions
6-hr Max temp: 67F
6-hr Min temp: 61F
6-hr precip: 0.13 ins.
BHO SA 1755 E8 OVC 30L- 066/62/61/2307/972/ FEW LWR
STFRA DRFTG BLO SMT SSW-NNE LINE OF CLRG ALG HRZN WNW-S
DSNT FG ALQDS/ 8/6// 56004 MANUAL 6013/ ASOS 60017
10067 20061

SUMMARY FOR TUESDAY, OCTOBER 24, 2017

TEMPERATURE (DEGREES F)
MAX…..73   NORMAL…..58
MIN…..64   NORMAL…..40
MEAN….69   NORMAL…..49

DEPARTURE FROM 30-YEAR NORMAL……………………+20
TOTAL DEPARTURE FOR THE MONTH…………………..+209 [+8.5 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………4   DEPARTURE……….+4
TOTAL COOLING UNITS FOR THE MONTH…………..24   DEPARTURE………+19
TOTAL COOLING UNITS FOR THE SEASON…………731   DEPARTURE……..+129
TOTAL COOLING UNITS LAST SEASON TO DATE…….901   DEPARTURE……..-170

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………0   DEPARTURE………-16
TOTAL HEATING UNITS FOR THE MONTH………….108   DEPARTURE……..-191
TOTAL HEATING UNITS FOR THE SEASON…………201   DEPARTURE……..-240
TOTAL HEATING UNITS LAST SEASON TO DATE…….272   DEPARTURE………-71

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….50  SSE AT  2:01 P.M.
AERO……………………51  S   AT  2:45 P.M.
ASOS……………………52  S   AT  2:58 P.M.
DAVIS…………………..50  S   AT  2:01 P.M.  RMY N/A
FASTEST MILE FOR YESTERDAY…………………36  S   AT 10:41 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………37  S   AT 10:42 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..35  S   AT 10:42 A.M.
AVERAGE WIND SPEED AND DIRECTION………….23.8  S
ASOS………………….22.7
DAVIS…………………20.8  S  [170 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….1.31  DEPARTURE……+1.26
ASOS…………..1.38
TOTAL PRECIPITATION FOR THE MONTH……….1.92  DEPARTURE……-1.68
ASOS…………..2.01
TOTAL PRECIPITATION FOR THE YEAR……….43.78 DEPARTURE……+0.05
ASOS……………N/A ***
*** ASOS annual total not available due to erroneous readings

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

10/1  65/42/54/-3/0.00/697/99             18 WNW AERO 16 NW  RMY N/A
10/2  65/46/56/-1/0.00/687/98             21 NNW AERO 21 NNW RMY 21
10/3  67/50/59/+3/0.00/677/97             21 S   AERO 21 S   RMY N/A
10/4  75/50/63/+7/0.00/660/95             30 SSW AERO 30 SW  RMY 32
10/5  79/60/70/+14/0.00/429/62            28 SW  AERO 26 SW  RMY N/A
10/6  73/57/65/+10/T/352/51               15 NW  AERO 14 NW  RMY 15
10/7  75/59/67/+12/T/344/50               29 S   AERO 30 SSW RMY N/A
10/8  71/67/69/+15/0.23/007/01            33 S   AERO 36 SSW RMY 37
10/9  71/68/70/+16/0.22/000/00            43 S   AERO 41 S   RMY 45
10/10 76/61/69/+15/0.00/637/94            21 WNW AERO 20 WNW RMY 21
10/11 68/55/62/+9/0.00/122/18             29 ENE AERO 25 ENE RMY 29
10/12 58/48/50/0/T/169/25                 30 NE  AERO 28 ENE RMY 30
10/13 64/48/56/+3/0.00/545/81             20 E   AERO 16 E   RMY 17
10/14 66/54/60/+8/…/637/94              15 SSE AERO 13 SSE RMY 13
10/15 72/58/65/+13/…/067/10             39 SSW AERO 36 SSW RMY 40
10/16 66/39/53/+2/…/146/22              28 NNW AERO 25 NNW RMY 29
10/17 57/35/46/-5/0.00/007/01             25 S   AERO 22 S   RMY 25
10/18 70/45/58/+7/0.00/659/100             25 SW  AERO 23 SW  RMY 22
10/19 72/52/62/+12/0.00/649/99            31 SSW AERO 30 SSW RMY 32
10/20 68/53/61/+11/0.00/…/..            28 WNW AERO 25 WNW RMY 29
10/21 77/52/65/+15/0.00/…/..            21 NW  AERO 20 NW  RMY 18
10/22 73/54/64/+15/0.00/…/..            21 ENE AERO 16 ENE RMY 17
10/23 69/50/60/+11/0.00/…/..            24 SSE AERO 24 SSE RMY N/A
10/24 73/64/69/+20/…/…/..             50 SSE AERO 51 S   RMY N/A

10/25 Low temp since midnight is 64F; normal low is now 40F

DAILY RECORDS FOR OCTOBER

10/8/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 67F,
BREAKS PREVIOUS RECORD OF 60F SET IN 1944

10/9/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 68F,
BREAKS PREVIOUS RECORD OF 61F SET IN 2011

10/9/17: MONTHLY RECORD HIGH MINIMUM TEMPERATURE OF 68F,
BREAKS PREVIOUS RECORD OF 67F SET ON OCTOBER 13, 1990
AND TIED ON OCTOBER 8, 2017

10/24/17: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 64F,
BREAKS PREVIOUS RECORD OF 61F SET IN 2001

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

RECORDS FOR OCTOBER 25
HIGH 81F IN 1963
LOW 26F IN 1922,1939
PRECIP 2.45 INCHES IN 2005
SNOWFALL 1.2 INCHES IN 1960
PEAK GUST 72 MPH ESE IN 1980

RECORDS FOR OCTOBER 26
HIGH 80F IN 1963
LOW 24F IN 1933
PRECIP 1.72 INCHES IN 1894
SNOW 3.0 INCHES IN 1962
WIND 59 MPH SSE IN 1967

TODAY’S REPORT PREPARED BY: Kaitlin Geagan