Thursday, October 25, 2018

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, OCTOBER 25, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME

HIGH PRESSURE USHERS IN CLEARING SKIES
AND COLD TEMPERATURES ALONGSIDE NW WINDS…

Rising pressure this morning was coupled with
clearing skies and cold temperatures well below
seasonal readings.  The minimum temperature this
morning was 32 F, 8 degrees below the norm. Cold NW winds have
enforced cold temperatures throughout the day with a maximum
of just 48 F reached at 1 P.M..  Wind speeds remain
breezy, with gusts up to 31 mph arriving during the morning hours.
Rising pressure crested mid-morning today, with the 10 A.M.
observation suggesting the peak for the day, and values
continue to fall through the 1 P.M. observation.
Visibility has remained in excess of 70 miles throughout the day
and the air has dried considerably throughout the day,
with the relative humidity dropping from 85% at 7 A.M.
to just 37% at 1 P.M.

Today’s Observations:

7 A.M.
Weather: Distant cumulus in all directions,
broken altocumulus, broken cirrus
Temperature: 35F; Dew Point: 31F; Wind: WNW at 10G14 kts
Sea-level pressure: 30.02 ins. Hg, rising steadily
Visibility: 70 miles
6-hr Max temp: 34F
6-hr Min temp: 32F
24-hr Precip: 0.01 ins.
BHO SA 1155 E160 BKN 250 BKN 70 166/35/31/2810G14/002/
FEW DSNT CU ALQDS 8/472 53003 70001 10034 20032

10 A.M.
Weather: Broken cumulus, few cirrocumulus
Temperature: 43F; Dew Point: 30F; Wind: WNW at 14G21 kts
Peak wind: NW at 31 mph (27 kts) at 9:41 A.M.
Sea-level pressure: 30.00 ins. Hg, decreasing steadily
Visibility: 70 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E40 BKN 70 159/43/30/2814G21/000/
FEW CC PK WND 3127/41/ 8/109 58007

1 P.M.
Weather: Scattered cumulus
Temperature: 47F; Dew Point: 22F; Wind: WNW at 18G26 kts,
Sea-level pressure: 29.94 ins. Hg, falling rapidly
Visibility: 75 miles
6-hr Max temp: 48F
6-hr Min temp: 33F
6-hr Precip: 0.00 ins.
BHO SA 1755 45 SCT 75 138/47/22/2818G26/994/
8/100 58021 10048 20033

SUMMARY FOR WEDNESDAY, OCTOBER 24, 2018

TEMPERATURE (DEGREES F)
MAX…..45   NORMAL…..58
MIN…..35   NORMAL…..40
MEAN….40   NORMAL…..49

DEPARTURE FROM 30-YEAR NORMAL………………….-9
TOTAL DEPARTURE FOR THE MONTH………………….+6 [+0.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..25   DEPARTURE………+9
TOTAL HEATING UNITS FOR THE MONTH………….298   DEPARTURE……..-1
TOTAL HEATING UNITS FOR THE SEASON…………385   DEPARTURE……..-56
TOTAL HEATING UNITS LAST SEASON TO DATE…….201   DIFFERENCE……+189

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0  DEPARTURE………..0
TOTAL COOLING UNITS FOR THE MONTH…………..11  DEPARTURE……….+6
TOTAL COOLING UNITS FOR THE SEASON…………874  DEPARTURE……..+272
TOTAL COOLING UNITS LAST SEASON TO DATE…….727  DIFFERENCE…….+147

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..31 NW  AT  11:43 A.M.
AERO…………………….31 NW  AT  11:47 A.M.
ASOS…………………….32 NW  AT  11:48 A.M.
DAVIS……………………32 NW  AT  11:48 A.M. RMY 32
FASTEST MILE FOR YESTERDAY………………….21 NW  AT  11:44 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….22 NW  AT  11:49 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………23 NW  AT  11:49 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..12.1 NW
ASOS…………………..11.7
DAVIS………………….8.5  NW [324 deg.] **
**Davis malfunctioning

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.01  DEPARTURE……-0.14
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….3.33  DEPARTURE……-0.42
ASOS…………..3.31
TOTAL PRECIPITATION FOR THE YEAR……….50.53  DEPARTURE……+7.88
ASOS………….52.23

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

10/01 65/53/59/+2/…./042/06         21 ENE AERO 18 SSW RMY N/A
10/02 64/53/59/+2/…./000/00         33 S   AERO 32 S   RMY 35 TSTM
10/03 60/52/56/0/…./000/00          18 NNE AERO 14 NNE RMY 14
10/04 69/57/63/+7/…./209/30         29 SSW AERO 29 SSW RMY 32
10/05 64/47/56/0/…./638/92          25 NE  AERO 21 NE  RMY 24
10/06 64/45/55/0/0.00/276/40          23 SSW AERO 23 SSW RMY 25
10/07 75/56/66/+11/…./076/11        28 NE  AERO 24 ENE RMY 27
10/08 56/53/55/+1/…./000/00         22 ENE AERO 20 ENE RMY N/A
10/09 75/56/66/+12/…./211/31        26 WSW AERO 28 SW  RMY 29
10/10 82/65/74/+20/…./496/73        24 WSW AERO 23 WSW RMY 25
10/11 70/56/63/+10/…./…/..        48 NNE AERO 47 NNE RMY 50
10/12 59/44/52/-1/…./…/..         32 NW  AERO 32 NW  RMY 33
10/13 49/40/45/-8/…./…/..         21 WNW AERO 20 WNW RMY 20
10/14 55/37/46/-6/…./…/..         21 W   AERO 18 W   RMY 21
10/15 66/44/55/+3/…./…/..         46 W   AERO 46 W   RMY N/A
10/16 56/41/49/-2/…./…/..         48 W   AERO 48 W   RMY N/A
10/17 60/39/50/-1/…./…/..         48 W   AERO 50 W   RMY 53
10/18 45/33/39/-12/…./…/..        32 WNW AERO 35 WNW RMY 36
10/19 60/31/46/-4/…./…/..         33 SSW AERO 36 SSW RMY 36
10/20 62/46/54/+4/…./…/..         35 SSW AERO 37 SSW RMY 33
10/21 46/31/39/-11/…./…/..        39 NNW AERO 41 NW  RMY 41
10/22 50/27/39/-10/…./…/..        24 W   AERO 22 W   RMY 21
10/23 53/40/47/-2/…./…/..         29 WNW AERO 29 WNW RMY 29 TSTM
10/24 45/35/40/-9/…./…/..         31 NW  AERO 31 NW  RMY 32

10/25 Low temp since midnight is 32F; normal low is 40F

DAILY RECORDS FOR OCTOBER

10/10/18: DAILY RECORD HIGH MINIMUM TEMPERATURE OF 65F,
BREAKS PREVIOUS RECORD OF 62F SET IN 1949

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: Nate Iannuccillo