Tuesday, October 24, 2017

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, OCTOBER 24, 2017
ALL TIMES ARE IN EASTERN STANDARD TIME

HIGH PRESSURE SYSTEM FINALLY MOVES OUT OF AREA

Pressure began falling overnight allowing
winds to pick up and low level stratus clouds
to form. Skies remained overcast with small
breaks in the cloud cover through out the day.
An overnight rain storm left 0.11 ins.
of precipitation on top of Great Blue Hill.
An afternoon rainstorm left and additional
0.05 ins. by the 1:00 PM EST.

Low pressure has made for a windy afternoon
with a peak gust of 42 kts (48 MPH) by 1400E.
Winds have been from the S/SSE. With winds from
the southern direction, temperatures continue to
be above seasonable with a high of 72F by 1:00 PM.
EST. This is 14 degrees above the normal of 58F.

Today’s Observations:

7 A.M.
Weather: Broken stratus, overcast altocumulus,
break in overcast overhead SSE and S,
few lower stratus fractus drifting below summit
Temperature: 65F; Dew Point: 63F; Wind: SSE at 16G22 kts,
Sea-level pressure: 30.03 ins. Hg, falling then steady
Visibility: 30 mile distant fog in all directions
6-hr Max temp: 65F
6-hr Min temp: 63F
24-hr precip: 0.11 ins.
BHO SA 1155 E30 BKN E65 OVC 30 169/65/63/1516G22/003/
BINOVC OVHD-SSE-S FEW LWR STFRA DRFTG BLO SMT DSNT FG ALQDS/
8/630 56004 MANUAL 70011 ASOS 70013 10065 20063

10 A.M.
Weather: Overcast stratus fractus
Temperature: 73F; Dew Point: 65F; Wind: SSE at 26G36 kts
Sea-level pressure: 29.98 ins. Hg, falling unsteadily
Visibility: 30 mile distant fog in all directions
BHO SA 1455 E40 OVC 30 152/73/65/1526G36/998/ DSNT FG ALQDS/ 8/7// 58017

1 P.M.
Weather: Light drizzle, break in overcast overhead
Temperature: 72F; Dew Point: 65F; Wind: S at 24G33 kts,
Peak wind: 37 kts (43mph) S @ 1243E
Sea-level pressure: 29.95 ins. Hg, falling steadily
Visibility: 30 miles distant fog in all directions
6-hr Max temp: 72F
6-hr Min temp: 64F
6-hr precip: 0.05 ins.
BHO SA 1755 E42 OVC 30L- 142/72/65/1724G33/995/ BINOVC OVHD DSNT FG ALQDS
PKWND 1737/43/ 8/7// 58010 MANUAL 6005/ 60006 10072 20064

SUMMARY FOR MONDAY, OCTOBER 23, 2017

TEMPERATURE (DEGREES F)
MAX…..69   NORMAL…..58
MIN…..50   NORMAL…..40
MEAN….60   NORMAL…..49

DEPARTURE FROM 30-YEAR NORMAL……………………+11
TOTAL DEPARTURE FOR THE MONTH…………………..+189 [+8.0 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0   DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH…………..20   DEPARTURE………+15
TOTAL COOLING UNITS FOR THE SEASON…………727   DEPARTURE……..+125
TOTAL COOLING UNITS LAST SEASON TO DATE…….901   DEPARTURE……..-174

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………5   DEPARTURE………-11
TOTAL HEATING UNITS FOR THE MONTH………….108   DEPARTURE……..-175
TOTAL HEATING UNITS FOR THE SEASON…………201   DEPARTURE……..-224
TOTAL HEATING UNITS LAST SEASON TO DATE…….257   DEPARTURE………-56

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….24  SSE AT 10:39 P.M.
AERO……………………24  SSE AT 10:42 P.M.
ASOS……………………25  S   AT 10:41 P.M.
DAVIS…………………..23  S   AT 10:40 P.M.  RMY 17
FASTEST MILE FOR YESTERDAY…………………18  SSE AT 10:43 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………18  SSE AT 10:45 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..17  SSE AT 10:44 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..6.2  SE
ASOS…………………..6.3
DAVIS………………….5.7  SSE [157 DEG.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……-0.05
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.61  DEPARTURE……-2.84
ASOS…………..0.63
TOTAL PRECIPITATION FOR THE YEAR……….42.47
DEPARTURE……..-0.06
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/…/..                 30 NE  AERO 28 ENE RMY 30
10/13 64/48/56/+3/0.00/…/..             20 E   AERO 16 E   RMY 17
10/14 66/54/60/+8/…/…/..              15 SSE AERO 13 SSE RMY 13
10/15 72/58/65/+13/…/…/..             39 SSW AERO 36 SSW RMY 40
10/16 66/39/53/+2/…/…/..              28 NNW AERO 25 NNW RMY 29
10/17 57/35/46/-5/0.00/…/..             25 S   AERO 22 S   RMY 25
10/18 70/45/58/+7/0.00/…/..             25 SW  AERO 23 SW  RMY 22
10/19 72/52/62/+12/0.00/…/..            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 Low temp since midnight is 60F; 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

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

RECORDS FOR OCTOBER 24
HIGH 79F IN 1963
LOW 22F IN 1969
PRECIP 2.96 INCHES IN 1890
SNOWFALL 1.8 INCHES IN 1960
PEAK GUST 70 MPH SE IN 1959

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

TODAY’S REPORT PREPARED BY: Kaitlin Geagan/ Afshin Pourmokhtarian