Monday, December 9, 2013

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, DECEMBER 9, 2013
ALL TIMES ARE IN EASTERN STANDARD TIME

FIRST HALF INCH OF SNOW OF SEASON THIS MORNING
SNOW WAS MIXED WITH SLEET AND FREEZING RAIN

Snow which began during the very early morning
hours became mixed with sleet and some freezing
drizzle by 6 a.m. and measurement at 7 A.M. EST
was 0.4 inch of snow and sleet on the boards.
During the next few hours sleet continued to
accumulate 0.2 inch for an event total of 0.6 inch.
A thin coating of glaze formed during periods of
freezing drizzle and a little freezing rain.
The temperature climbed above 32 degrees shortly
after 10 A.M. with a period of light rain continuing.

Today’s Observations:

7 A.M.
Weather: Partial obscurement with 5/10 fog, low overcast
stratus, fog obscuring 5/10 of sky, light freezing
drizzle and light ice pellets
Temperature: 30F; Dew Point: 30F; Wind: E at 10 kts
Sea-level pressure: 30.29 ins. Hg, falling then more slowly
Visibility: 1 mile, light ice pellets, light freezing drizzle,
thin fog
6-hr min temp: 25F
24-hr precip: 0.07 in.
24-hr snowfall: 0.4 in.
BHO SA 1155 –X E3 OVC 1IP-ZL-F 258/30/30/0910/029/ F5
STRA DRGTNG OVR SMT VSBY OCNL LWR TOTAL NEW SNW 0.4 IN
THN GLZ ALL SFCS/ 8/6// 58029 ASOS 60007 MANUAL 70007
10031 20025

10 A.M.
Weather: Partial obscurement with 3/10 fog, light rain
and fog, ice pellets and freezing rain ended 9:45 A.M.
Temperature: 32F; Dew Point: 32F; Wind: E at 11 kts,
Sea-level pressure: 30.17 ins. Hg, falling
Visibility: 1 mile variable 3/4 to 11/2 miles, light rain,
3-hour precip: 0.16
3-hour snowfall: 0.2 inch
BHO SA 1455 –X E3 OVC 1VR-F 217/32/32/0911/017/ F3 STRA DRFTG OVR SMT
VSBY 3/4V11/2 IP-EUKNSG-EUKNIPE45 TOTAL NEW IP PST 3 HRS 0.2 IN/
8/6// 56041 ASOS 60017 MANUAL 6016/

1 P.M.
Weather: Obscurement with heavy fog, light drizzle occurring
Temperature: 36F; Dew Point: 36F; Wind: E at 10 kts,
Sea-level pressure: 30.03 ins. Hg, falling then more rapidly
Visibility: 1/16 mile, light drizzle and heavy fog
6-hr. max temp. 37F
6-hr. precip: 0.23 in.
6-hr. snow/sleet 0.2 in.
BHO SA 1755 W2X 1/16L-F 168/36/36/1010/003/ TOTAL NEW IP PST 6 HRS
0.2 IN 8//// 58049 MANUAL 6023/ ASOS 60024 10037 20030

WEATHER SUMMARY FOR SUNDAY, DECEMBER 8, 2013

TEMPERATURE (DEGREES F)
MAX…..30    NORMAL…..42
MIN…..22    NORMAL…..26
MEAN….26    NORMAL…..34

DEPARTURE FROM 30-YEAR NORMAL………………….-8
TOTAL DEPARTURE FOR THE MONTH…………………+16 [+1.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..39  DEPARTURE………+8
TOTAL HEATING UNITS FOR THE MONTH………….222  DEPARTURE……..-16
TOTAL HEATING UNITS FOR THE SEASON………..1446  DEPARTURE……..-54
TOTAL HEATING UNITS LAST SEASON TO DATE……1345  DIFFERENCE……+101

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………25 NW  AT  2:12 A.M.
AERO…………………..28 NW  AT  2:13 A.M.
ASOS…………………..28 NW  AT  2:13 A.M.
DAVIS………………….24 WNW AT 11:20 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………..19 NW  AT  2:12 A.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE……………..18 NW  AT  2:14 A.M. .
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….19 WNW AT  2:52 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..5.9 NW
ASOS…………………..5.9
DAVIS……………….. .5.2 NNW [330 degrees] * last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M… 0.07  DEPARTURE………….-0.10
ASOS…………..0.07
TOTAL PRECIPITATION FOR THE MONTH……….0.87  DEPARTURE………….-0.45
ASOS…………..0.83
TOTAL PRECIPITATION FOR THE YEAR……….47.47 DEPARTURE…………..-2.38
ASOS…………..N/A**
** ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M…….0.4     DEPARTURE………….+0.1
TOTAL SNOWFALL FOR THE MONTH………….0.4     DEPARTURE………….-2.0
TOTAL SNOWFALL FOR THE SEASON…………0.6     DEPARTURE………….-4.4

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 2013 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust
RMY:  RMY = R.M. Young wind gust recording system added 8/9/2011
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized

12/1  45/30/38/+1/0.28/T/000/00           22 SSE AERO 23 MPH SSE RMY 23
12/2  38/34/36/0/T/0.0/000/00             15 NW  AERO 15 MPH NW  RMY N/A
12/3  45/32/39/+3/0.00/0.0/…/..         18 NNW AERO 18 MPH NNW RMY 20
12/4  43/29/36/+1/0.00/0.0/…/..         21 WNW AERO 21 MPH WNW RMY 21
12/5  53/38/46/+11/…/0.0/000/00         36 S   AERO 40 MPH S   RMY 39
12/6  55/33/44/+9/…/T/000/00            25 SSW AERO 28 MPH SSW RMY N/A
12/7  40/26/33/-1/…/../…/..           23 NW  AERO 25 MPH NW  RMY N/A
12/8  30/22/26/-8/0.00/0.0/…/..         25 NW  AERO 27 MPH NW  RMY N/A

12/9  morning low temp: 25; the normal low is now 26F

DAILY RECORDS FOR DECEMBER 2013
None so far.

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

RECORDS FOR DECEMBER 9
HIGH 68 IN 1966
LOW -14 IN 1902
PRECIP 1.52 INS. IN 1956
SNOWFALL 10.8 INS. IN 2005
PEAK GUST 66 SE IN 1973

RECORDS FOR DECEMBER 10
HIGH 62 IN 1946
LOW -6 IN 1902
PRECIP 1.67 INS. IN 1907
SNOWFALL 6.0 INS. IN 1905
PEAK GUST 66e SW IN 1940

TODAY’S REPORT PREPARED BY: Robert Skilling