Thursday, October 9, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, OCTOBER 9, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

CLEAR, SUNNY, WINDY AND TURNING MUCH DRIER TODAY
LIGHT SHOWERS PRODUCED ONLY 0.01 IN. YESTERDAY MORNING
AND 0.01 DURING TUESDAY AFTERNOON
INCREASING WEST WINDS GUSTING NEAR 40 MPH EARLY THIS AFTERNOON.

Some early morning cloudiness quickly cleared away this
morning as a cooler and drier air mass was arriving on
increasingly gusty west winds. Dew points dropped from the upper
30’s early this morning to near 30-34 degrees by early afternoon
with a relative humidity nearing 30%. The highest temperature has
reached the low 60’s, some 10 degrees cooler than yesterday.
The light showers Tuesday afternoon and early yesterday morning
left only 0.02 inch of rainfall despite downpours in the local
area early yesterday morning.
Our peak gust on the R.M. Young through early afternoon is 39 MPH.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, altocumulus castellanus, clouds dissipating
during the past hour, small patch altocumulus castellanus NE
Temperature: 50F; Dew Point: 37F; Wind: WSW at 13 kts
Sea-level pressure: 29.95 ins. Hg, rising then more slowly
Visibility: 50 miles, distant haze
6-hr max temp: 52F
6-hr min temp: 48F
24-hr precip: 0.00
BHO SA 1155 65 SCT 50 143/50/37/2413/995/ SML PTCH ACC NE
AC/ACC DSSPTNG PST HR DSNT HZ/ 8/080 51010 10052 20048

10 A.M.
Weather: Clear, cumulus fractus/cumulus forming W-N, altocumulus
castellanus distant ESE-SSE, few cirrus distant S-SW
Temperature: 58F; Dew Point: 35F; Wind: W at 14 kts,
Wind: Gust to 22 kts past hour
Sea-level pressure: 29.95 ins. Hg, falling, then more slowly
Visibility: 55 miles
BHO SA 1455 CLR 55 141/58/35/2614/995/ CUFRA/CU FRMG W-N
FEW ACC DSNT ESE-SSE FEW CI DSNT S-SW GST 22 KTS PST
DSNT HZ/ 8/181 58002

1 P.M.
Weather: Clear, few cumulus fractus and cumulus, few cirrus distant SSE
Temperature: 62F; Dew Point: 34F; Wind: W at 14 kts,
Wind: Peak wind 28 kts from W at 12:20 p.m.
Sea-level pressure: 29.91 ins. Hg, falling, then more quickly
Visibility: 60 miles, distant haze
6-hr max temp: 63F
6-hr min temp: 50F
6-hr precip: none
BHO SA 1755 CLR 60 129/62/34/2614/991/ FEW CUFRA/CU FEW CI DSNT SSE
DSNT HZ PK WND 2728/20/ WND 22V28/ 8/101 58012 10063 20050

WEATHER SUMMARY FOR WEDNESDAY, OCTOBER 8, 2014

TEMPERATURE (DEGREES F)
MAX…..72    NORMAL…..63
MIN…..53    NORMAL…..46
MEAN….63    NORMAL…..54

DEPARTURE FROM 30-YEAR NORMAL…………………….+9
TOTAL DEPARTURE FOR THE MONTH…………………….+2 [+0.1 DEGREE/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY……………0  DEPARTURE…………0
TOTAL COOLING UNITS FOR THE MONTH……………0  DEPARTURE………..-3
TOTAL COOLING UNITS FOR THE SEASON…………587  DEPARTURE……….-13
TOTAL COOLING UNITS LAST SEASON TO DATE…….701  DIFFERENCE……..-114

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………2  DEPARTURE………..-9
TOTAL HEATING UNITS FOR THE MONTH…………..72  DEPARTURE………..-5
TOTAL HEATING UNITS FOR THE SEASON…………173  DEPARTURE……….-47
TOTAL HEATING UNITS LAST SEASON TO DATE…….170  DIFFERENCE……….+3

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………40 S   AT  4:32 A.M.
ASOS…………………..45 S   AT  4:22 A.M.
DAVIS………………….43 S   AT  4:22 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………..32 S   AT  4:32 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..31 SSW AT  4:36 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….31 S   AT  4:33 A.M.
AVERAGE WIND SPEED AND DIRECTION………….16.6 WSW
ASOS………………….15.7
DAVIS…………………14.9 SW (220 degrees)
* 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……….2.29  DEPARTURE……..+1.10
ASOS…………..2.29
TOTAL PRECIPITATION FOR THE YEAR……….33.88  DEPARTURE……..-6.39
ASOS………….34.09

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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

10/1 56/55/56/-1/…./000/00              33 NE  RMY 36
10/2 55/47/51/-6/…./000/00              30 NE  RMY N/A
10/3 54/46/50/-6/0.05/000/00              20 NE  RMY 20
10/4 63/52/58/+2/0.30/000/00              30 SE  RMY 32
10/5 60/45/53/-3/0.00/…/..              26 W   RMY 28
10/6 66/42/54/-1/0.00/…/..              25 SSE RMY N/A
10/7 72/54/63/+8/0.01/…/..*             43 S   RMY 49
10/8 72/53/63/+9/0.01/…/..              40 S   RMY N/A

10/9 morning low temp: 48F since midnight; normal low now 45F

* correction to precip. from 10/8 report;
amount is corrected to read 0.01 from 0.02

DAILY RECORDS FOR OCTOBER 2014:
10/1 – A new record daily precipitation amount
for this date is currently being determined;
the previous record was 1.44 ins. in 1984

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

RECORDS FOR OCTOBER 9
HIGH 82F IN 2011
LOW 29F IN 1907,1937
PRECIP 2.54 INCHES IN 1976
SNOWFALL 0.2 INCHES IN 1888
PEAK GUST 81e MPH S IN 1976 (RECORD FOR MONTH)

RECORDS FOR OCTOBER 10
HIGH 85F IN 1949
LOW 27F IN 1929
PRECIP 2.02 INCHES IN 1998
SNOWFALL 6.8 INCHES IN 1979 (RECORD FOR MONTH)
PEAK GUST 59 MPH WNW IN 1958

TODAY’S REPORT PREPARED BY: Robert Skilling