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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, DECEMBER 9, 2014     
ALL TIMES ARE IN EASTERN STANDARD TIME

SNOW TRANSITIONS TO RAIN EARLY THIS MORNING, THICK FOG
AND INCREASING WINDS COME ONSHORE WITH STRENGTHENING 
NOR'EASTER

Yesterday's maximum of just 25F was recored at midnight
this morning, with a daily average temperature of 21F
for all of Monday, -13 degrees below the norm. Light,
continuous snow showers left a coating of snow by late
afternoon on Monday, but this quickly melted once temperatures
climbed above freezing by 2:00 AM EST this morning.

With a Flood Watch in effect, today's daily precipitation
record of 1.52 inches, set back in 1956, may be broken
depending on rain totals by midnight tonight. By the 1:00 
PM EST observation 1.32 inches of rain had fallen so far 
for this storm event, with winds gusting to a maximum
of 46 MPH from the NE at 1:15 PM EST.


Today's Observations:

7 A.M.
Weather: Light rain, fog
Temperature: 41F; Dew Point: 41F; Wind: ENE at 15G22 kts
Peak Wind: 25 kts ENE @ 06:33 AM EST
Sea-level pressure: 30.27 ins. Hg, falling, then more quickly                   
Visibility: 1/4 of a mile, except 1/2 of a mile SE-SW, obscured
by thick fog
6-hr max temp: 41F
6-hr min temp: 27F 
24-hr precip:  0.16 ins.
24-hr snowfall: Trace 
BHO SA 1155 W3 X 1/4R-F 249/41/41/0715G22/027/ VSBY SE-SW 1/2 MI 
NEW SNW PST 24 HRS TRACE PK WND 0725/33/ 8//// 58026 ASOS 60010 
70013 MANUAL 70016 10041 20027

10 A.M. 
Weather: Moderate rain, fog  
Temperature: 42F; Dew Point: 42F; Wind: ENE at 16G25 kts
Peak Wind: 28 kts ENE at 09:02 AM EST
Sea-level pressure: 30.17 ins. Hg, falling, then more slowly   
Visibility: 1/4 of a mile, except 1/2 of a mile SE-SW, obscured
by thick fog
3-hour precip: 0.33 ins.
3-hour snowfall: 0.0 ins.
BHO SA 1455 W3 X 1/4RF 216/42/42/0616G25/017/ VSBY SE-SW 1/2 MI 
PK WND 0628/02/ 8/// 56033 ASOS 60034 MANUAL 60033

1 P.M.
Weather: Heavy rain, thick fog
Temperature: 44F; Dew Point: 44F; Wind: ENE at 26G36 kts
Sea-level pressure: 29.92 ins. Hg, falling rapidly
Visibility: 1/4 of a mile, except 1/2 of a mile SE-SW,
obscured by thick fog
6-hr max temp: 44F
6-hr min temp: 41F
6-hour precip: 1.16 ins.
6-hour snowfall: 0.0 ins.
BHO SA 1755 W4 X 1/4R+F 131/44/44/0726G36/992/ VSBY SE-SW 1/2 MI 
PRESFR PK WND 0836/50/ 8//// 58085 ASOS 60117 MANUAL 60116 10044 20041 

 
SUMMARY FOR MONDAY, DECEMBER 8, 2014 

TEMPERATURE (DEGREES F)
MAX.....25   NORMAL.....42
MIN.....16   NORMAL.....26
MEAN....21   NORMAL.....34

DEPARTURE FROM 30-YEAR NORMAL........................-13
TOTAL DEPARTURE FOR THE MONTH.........................-1 [-0.3 DEGREES/DAY] 

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY..............44  DEPARTURE..........+13
TOTAL HEATING UNITS FOR THE MONTH.............239  DEPARTURE...........+1     
TOTAL HEATING UNITS FOR THE SEASON...........1398  DEPARTURE.........-102
TOTAL HEATING UNITS LAST SEASON TO DATE......1446  DIFFERENCE.........-48

PEAK GUST AND AVERAGE WIND SPEED (MPH) 
PEAK WIND GUST FOR YESTERDAY..................24 N   AT 12:52 A.M.   
                   ASOS.......................28 N   AT 12:15 A.M.  
                   DAVIS......................25 N   AT 12:14 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY....................17 N   AT  2:03 A.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE.................18 N   AT 12:15 A.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE................18 N   AT 12:03 A.M. 
AVERAGE WIND SPEED AND DIRECTION.............12.3 N 
                   ASOS......................12.7   
                   DAVIS.....................11.0 N (357 degrees)  
* Last of several occurrences...
                
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.16  DEPARTURE.....-0.01 
                         ASOS..............0.13
TOTAL PRECIPITATION FOR THE MONTH..........1.84  DEPARTURE.....+0.52	  
                         ASOS..............1.83  
TOTAL PRECIPITATION FOR THE YEAR..........49.60  DEPARTURE.....-0.25
                         ASOS.............50.02   

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M........TRACE  DEPARTURE......-0.3
TOTAL SNOWFALL FOR THE MONTH..............TRACE  DEPARTURE......-2.4 
TOTAL SNOWFALL FOR THE SEASON...............8.7  DEPARTURE......+3.7  

PRELIMINARY CLIMATE SUMMARY FOR DECEMBER 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

12/1  63/37/50/+13/0.01/0.0/.../..             28 WNW RMY 31
12/2  37/30/34/-2/0.10/T/000/00                26 E   RMY 29
12/3  49/34/42/+6/0.31/0.0/000/00              40 W   RMY 43 
12/4  41/27/34/-1/..../0.0/.../..              29 WNW RMY N/A 
12/5  42/23/33/-2/..../0.0/.../..              21 E   RMY 22
12/6  43/36/40/+5/..../0.0/000/00              25 NNW RMY N/A
12/7  36/18/27/-7/..../0.0/.../..              31 N   RMY 34
12/8  25/16/21/-13/..../T/000/00               24 N   RMY N/A

12/9  morning low temp: 27F since midnight; the normal low is now 26F


DAILY RECORDS FOR DECEMBER 2014:
	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: Brian Fitzgerald