Friday, December 11, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, DECEMBER 11, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

DENSE EARLY MORNING FOG WITH HEAVY CONDENSATION
UNSEASONABLY WARM TEMPERATURES–MINIMUM 44F WAS +19 DEG.
DECEMBER AVERAGE TEMPERATURE OVER 7 DEG. ABOVE NORMAL

Dense fog prevailed here at the summit until after 10 A.M.
then visibility rose up to near 15 with hazy conditions
into the early afternoon.  The low temperature this morning
was almost 20 degrees above the normal and by early this
afternoon our temperature had reached the mid-50’s.

Today’s Observations:

7 A.M.
Weather: Sky obscured, heavy fog, heavy condensation
Temperature: 47F; Dew Point: 47F; Wind: S at 9 kts
Sea-level pressure: 29.95 ins. Hg, rising slightly
Visibility: 1/16 mile heavy fog
6-hr Max temp: 47F
6-hr Min temp: 44F
24-hr precip: Trace
BHO SA 1155 W2 X 1/16F 143/47/47/1809/995/ HVY CONDENSATION/
8//// 53005 ASOS 70001 MANUAL 70000 10047 20044

10 A.M.
Weather: Sky obscured, heavy fog, sun occasionally dimly visible
Temperature: 48F; Dew Point: 48F; Wind: S at 7 kts,
Sea-level pressure: 29.96 ins. Hg, rising, then falling slightly
Visibility: 1/16 mile, heavy fog
BHO SA 1455 W2X 1/16F 147/48/48/1807/996/ SUN BRFLY VSB/
8//// 50004

1 P.M.
Weather: Broken and overcast (2 LYRS) dense cirrus and
cirrocumulus, small breaks and thin spots in overcast
Temperature: 54F; Dew Point: 48F; Wind: S at 13 kts,
Sea-level pressure: 29.90 ins. Hg, falling, then more slowly
Visibility: 15 miles, hazy
6-hr max. temp: 55F
6-hr min. temp: 47F
BHO SA 1755 E200 BKN 220 OVC 15 125/54/48/1913/990/ DNS CI/CC
ALQDS FEW SML BINOVC/FEW THN SPTS IOVC HAZY/ 8/002 56022
10055 20047

SUMMARY FOR THURSDAY, DECEMBER 10, 2015

TEMPERATURE (DEGREES F)
MAX…..57   NORMAL…..41
MIN…..41   NORMAL…..26
MEAN….49   NORMAL…..33

DEPARTURE FROM 30-YEAR NORMAL…………………+16
TOTAL DEPARTURE FOR THE MONTH…………………+78  [+7.6 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..16   DEPARTURE………-16
TOTAL HEATING UNITS FOR THE MONTH………….223   DEPARTURE………-78
TOTAL HEATING UNITS FOR THE SEASON………..1225   DEPARTURE……..-337
TOTAL HEATING UNITS LAST SEASON TO DATE……1450   DIFFERENCE…….-225

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….29  SE  AT 12:23 A.M. *
ASOS……………………27  SE  AT 12:23 A.M.
DAVIS…………………..27  SE  AT 12:23 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY…………………17  SSE AT  2:45 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………18  SSE AT  2:47 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..19  SSE AT  2:47 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.8 SSE
ASOS…………………..10.4
DAVIS…………………..9.9 S [170 Deg.] * Last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….TRACE  DEPARTURE……-0.17
ASOS……………0.01
TOTAL PRECIPITATION FOR THE MONTH………..0.38  DEPARTURE……-1.27
ASOS……………0.37
TOTAL PRECIPITATION FOR THE YEAR………..39.79  DEPARTURE…..-10.39
ASOS…………….N/A ***
*** ASOS annual total not available due to erroneous readings

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……-0.4
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE……-3.2
TOTAL SNOWFALL FOR THE SEASON………….TRACE  DEPARTURE……-5.8

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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

12/1  42/30/36/-1/…./0.0/000/00           19 NNE RMY 19
12/2  53/37/45/+9/…./0.0/000/00           25 SSE RMY 25
12/3  53/37/45/+9/…./0.0/…/..           43 WNW RMY 42
12/4  47/32/40/+5/0.00/0.0/…/..           32 NW  RMY 32
12/5  50/33/42/+7/0.00/0.0/…/..           21 W   RMY N/A
12/6  57/35/46/+11/0.00/0.0/…/..          22 SW  RMY N/A
12/7  54/37/46/+12/0.00/0.0/…/..          31 NE  RMY N/A
12/8  42/35/39/+5/0.01/0.0/000/00           32 NE  RMY 31
12/9  44/34/39/+5/…./0.0/…/..           28 SSE RMY N/A
12/10 57/41/49/+16/T/0.0/…/..             29 SE  RMY N/A

12/11 low since midnight is 44F; normal low is now 25F

DAILY RECORDS FOR DECEMBER 2015

-NONE SO FAR.

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

RECORDS FOR DECEMBER 11
HIGH 63 IN 1911
LOW -1 IN 1988
PRECIP 2.36 INS. IN 1992
SNOWFALL 6.0 INS. IN 1894
PEAK GUST 78 S IN 1969

RECORDS FOR DECEMBER 12
HIGH 67 IN 1979
LOW -3 IN 1988
PRECIP 3.94 INS. IN 1992
SNOWFALL 20.3 INS. IN 1960
PEAK GUST 75 MPH SSE IN 2008

TODAY’S REPORT PREPARED BY: Robert Skilling