Thursday, November 13, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, NOVEMBER 13, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY COLD FRONTAL PASSAGE LATE YESTERDAY
TEMPERATURES FALL BACK FROM UPPER 50’S
COLDER WITH BARELY A FREEZE THIS MORNING

The low clouds from early yesterday’s fog and
undercast condition were slow to clear until
about mid-afternoon. Then the sun came out and
our temperature rose to 59F or 8 degrees above
the normal.  The cold frontal passage late
yesterday was without precipitation as dew points
fell from the 50’s to 40’s to 30’s and finally
the 20’s early today. The low temperature was
barely a freeze at 32.2 in the Hazen shelter.

Today’s Observations:

7 A.M.
Weather: Clear, altocumulus/altocumulus lenticularis in patches
distant WSW-N, altocumulus layer distant NNE-ESE, cirrus WSW-N
Temperature: 33F; Dew Point: 28F; Wind: NW at 10 kts
Sea-level pressure: 30.07 ins. Hg, rising then more slowly
Visibility: 50 miles, light distant haze
6-hr max temp: 39F
6-hr min temp: 32F
24-hr precip: 0.00 inches
BHO SA 1155 CLR 50 182/33/28/3110/007/ PTCHS AC/ACSL DSNT WSW-N
AC LYR ALG HRZN DSNT NNE-ESE CI WSW-N LGT DSNT HZ/ 8/041 53008
10039 20032

10 A.M.
Weather: Thin broken cirrus, cirrostratus invading the sky,
few altocumulus distant WNW-NW, clear sky ESE-SW
Temperature: 43F; Dew Point: 26F; Wind: N at 7 kts,
Wind: Direction variable NW-N
Sea-level pressure: 30.06 ins. Hg, decreasing slightly
Visibility: 60 miles, light distant haze
3-hr precip: 0.00
BHO SA 1455 250 -BKN 60 181/43/26/3507/006/ FEW AC DSNT WNW-NW FEW CC
CI INVDNG MSTLY CLR ESE-SW LWR CI W-N LGT DSNT HZ WND 31V01/
8/046 58001

Weather: Scattered opaque cirrus, broken partly thin cirrus,
few altocumulus distant NW and distant layer NNE-E
Temperature: 47F; Dew Point: 27F; Wind: SSW at 3 kts (estimated)
Sea-level pressure: 30.01 ins. Hg, falling then more quickly
Visibility: 60 miles, NW 70 miles, light distant haze
6-hr max temp: 49F
6-hr min temp: 33F
6-hr precip: 0.00 inches
BHO SA 1755 220 SCT E250 BKN 60 162/47/27/E2003/001/ FEW AC
DSNT NW AND LYR DSNT NNE-E CLR SKY E-S 250 BKN LYR PARTLY THN
VSBY NW 70 LGT DSNT HZ WND LGT/ 8/048 58019 10049 20033

SUMMARY FOR WEDNESDAY, NOVEMBER 12, 2014

TEMPERATURE (DEGREES F)
MAX…..59   NORMAL…..51
MIN…..40   NORMAL…..35
MEAN….50   NORMAL…..43

DEPARTURE FROM 30-YEAR NORMAL…………………….+7
TOTAL DEPARTURE FOR THE MONTH……………………+17 [+1.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..15  DEPARTURE………..-7
TOTAL HEATING UNITS FOR THE MONTH………….227  DEPARTURE……….-17
TOTAL HEATING UNITS FOR THE SEASON…………649  DEPARTURE………-158
TOTAL HEATING UNITS LAST SEASON TO DATE…….719  DIFFERENCE………-70

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………22 W   AT  5:08 P.M.
ASOS…………………..25 WNW AT  8:21 P.M.
DAVIS………………….24 WNW AT  8:22 P.M. RMY 25
FASTEST MILE FOR YESTERDAY………………..17 WNW AT  8:22 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..17 WNW AT  8:22 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….16 WNW AT  8:24 P.M.
AVERAGE WIND SPEED AND DIRECTION………….6.8 WNW
ASOS………………….6.7
DAVIS…………………6.1 W (280 degrees)
* Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE……..-0.16
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….1.66  DEPARTURE……..-0.22
ASOS…………..1.69
TOTAL PRECIPITATION FOR THE YEAR……….43.21  DEPARTURE……..-2.44
ASOS………….43.56

PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/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

11/1  45/36/41/-5/0.79/0.0/000/00              35 NNE RMY N/A
11/2  37/32/35/-11/0.29/1.8/000/00             46 NW  RMY 49
11/3  50/30/45/-6/0.00/0.0/584/95              39 WNW RMY 43
11/4  61/44/53/+8/0.00/0.0/208/34              28 SSW RMY 32
11/5  66/50/58/+13/0.00/0.0/006/01             29 SSW RMY N/A
11/6  52/45/49/+4/0.58/0.0/000/00              23 NE  RMY 24
11/7  46/34/40/-5/0.00/0.0/079/13              39 NW  RMY 42
11/8  47/30/39/-5/0.00/0.0/555/92              24 W   RMY 25
11/9  56/38/47/+3/0.00/0.0/…/..              23 SSW RMY N/A
11/10 58/40/49/+5/0.00/0.0/…/..              17 S   RMY 20
11/11 61/43/52/+9/0.00/0.0/…/..              22 S   RMY 25
11/12 59/40/50/+7/0.00/0.0/…/..              22 W   RMY 25

11/13 morning low temp: 32F since midnight; normal low now 34F

DAILY RECORDS FOR NOVEMBER 2014:
11/2 – A NEW RECORD DAILY SNOWFALL 1.8 INCHES;
surpasses the previous record of 0.2 ins. in 1906, 1951

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

RECORDS FOR NOVEMBER 13
HIGH 66 IN 1931, 1964
LOW 14 IN 1920
PRECIP 1.96 INCHES IN 1982
SNOWFALL 4.6 IN 2004
PEAK GUST 77 S IN 1982

RECORDS FOR NOVEMBER 14
HIGH 70 IN 1993
LOW 11 IN 1905
PRECIP 2.08 INCHES IN 2009
SNOWFALL 3.5 IN 1997
PEAK GUST 63 W IN 2003

TODAY’S REPORT PREPARED BY: Robert Skilling