BLUE HILL METEOROLOGICAL OBSERVATORY 
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, FEBRUARY 27, 2011
ALL TIMES ARE IN EASTERN STANDARD TIME
 
3.4 INCHES OF NEW SNOW TODAY...
 
A moderate low pressure system moved through the region
today, bringing 3.4 inches of new snow to the summit.
Snowfall began late on Saturday and continued through
the early afternoon. This snowfall brings our seasonal
accumulation up to almost 90 inches!
 
Meanwhile, at around 1230E this afternoon, a sudden shift
in the wind direction from east to north-northwest caused
temperatures to plummet 5 degrees in less than one-half hour.
Temperatures peaked at 31F around 1045E and dropped to 24F
following the shift. As of 1300E, skies remain overcast
with light snow grains and thin fog in all directions.
 
Today's observations:
 
7 A.M.  
Weather: Partial obscurement, overcast stratocumulus,
light snow, fog
Temperature: 28F, Dew point: 28F; Wind: E at 11 kts
Sea-level pressure: 29.92 inches Hg, falling
Visibility: 2 miles, light snow and fog
24-hour precip.: 0.18 inches
24-hour snowfall: 2.6 inches
Total snow depth on ground: 16 inches
6-hour min. temp: 27F
BHO SA 1155 –X E26 OVC 2S-F 132/28/28/0911/992/ SF1
TOTAL NEW SNOW PST 24 HRS 2.6 IN/ 8/6// 4/016 56014
MANUAL 6016/ ASOS 6015 MANUAL 70018 ASOS 70017 10028
20027
 
10 A.M.  
Weather: Overcast stratocumulus, very light snow, fog
Temperature: 30F, Dew point: 29F; Wind: NW at 4 kts,
Wind: Light
Sea-level pressure: 29.97 inches Hg, rising
Visibility: 1 1/2 miles, very light snow, fog 
3-hour precip: 0.07 inches
3-hour snowfall: 0.8 inches
BHO SA 1455 E10 OVC 11/2S-F 148/30/29/3304/997/ TOTAL
NEW SNOW PST 3 HRS 0.8 IN WND LGT/ 8/6// 51016 MANUAL
6007/ ASOS 6007
 
1 P.M.  
Weather: Overcast stratocumulus, broken stratocumulus,
very light precipitation, thin fog
Temperature: 25F, Dew point: 22F; Wind: NNW at 10 kts,
Wind: Direction variable WNW to NNE
Sea-level pressure: 30.01 inches Hg, rising
Visibility: 10 miles, thin fog
6-hour max temp: 31F 
6-hour precip: 0.01 inches
6-hour snowfall: 0.8 inches
BHO SA 1755 E8 BKN 15 OVC 10SG- 161/25/22/3310/001/ PCPN
VRY LGT TOTAL NEW SNOW PAST 6 HRS 0.8 IN THN FOG WND 30V02/
8/6// 53013 MANUAL 6001/ ASOS 6002 10031 20024
 
 
WEATHER SUMMARY FOR SATURDAY, FEBRUARY 26
 
TEMPERATURE (DEGREES F)
MAX.....35     NORMAL.....39
MIN.....21     NORMAL.....23
MEAN....28     NORMAL.....31
 
DEPARTURE FROM 30-YEAR NORMAL..................-3
TOTAL DEPARTURE FOR THE MONTH..................+8 [+0.1 DEGREES/DAY]
 
HEATING DEGREE DAYS    
TOTAL HEATING UNITS FOR YESTERDAY............37    DEPARTURE........+3
TOTAL HEATING UNITS FOR THE MONTH...........952    DEPARTURE.......-14
TOTAL HEATING UNITS FOR THE SEASON.........4453    DEPARTURE.......-49
TOTAL HEATING UNITS LAST SEASON TO DATE....4334    DIFFERENCE.....+119
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............36 W   AT 12:14 A.M.
                   AEROVANE...............39 W   AT 12:14 A.M.
                   ASOS...................36 WNW AT 12:14 A.M.
                   DAVIS..................33 NW  AT 12:12 A.M. 
THE FASTEST MILE FOR YESTERDAY............25 W   AT  9:07 A.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE.............23 W   AT  9:09 A.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE............30 NW  AT 11:26 P.M.  
AVERRAGE WIND SPEED AND DIRECTION.......13.7 WSW
                   ASOS.................13.0               
                   DAVIS................11.6 WNW [285 DEG]
* Last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.18  DEPARTURE.......+0.03
                         ASOS..............0.17   
TOTAL PRECIPITATION FOR THE MONTH..........4.40  DEPARTURE.......+0.64
                         ASOS..............4.34   
TOTAL PRECIPITATION FOR THE YEAR..........10.41  DEPARTURE.......+1.87
                        ASOS..............11.06**
** ASOS data is in error due to system failure on 1/12-13   
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........2.6  DEPARTURE........+2.1
TOTAL SNOWFALL FOR THE MONTH...............17.7  DEPARTURE........+2.7
TOTAL SNOWFALL FOR THE SEASON..............88.9  DEPARTURE.......+44.5 
 
PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 2011 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 when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
2/1  20/15/18/-8/0.80/7.5/000/00     27 N
2/2  34/18/26/0/1.17/3.1/000/00      35 NNE  AERO 37 MPH NNE TSTM
2/3  25/15/20/-6/T/T/067/11          21 WNW
2/4  32/13/23/-3/0.00/0.0/595/98     28 SW
2/5  45/22/34/+7/0.24/0.0/000/00     36 SW   AERO 42 MPH SW  TSTM
2/6  41/30/36/+9/0.00/0.0/532/87     53 W    AERO 58 MPH W
2/7  43/28/36/+9/0.04/0.2/049/08     20 SSE
2/8  36/13/25/-2/0.24/1.8/000/00     53 W    AERO 62 MPH W
2/9  28/9/19/-8/0.00/0.0/570/92      42 WNW  AERO 45 MPH WNW
2/10 26/13/20/-7/0.00/0.0/504/81     25 W
2/11 28/11/20/-7/0.00/0.0/537/86     23 SW
2/12 38/21/30/+2/T/T/088/14          39 W    AERO 46 MPH W
2/13 36/19/28/0/0.00/0.0/050/08      37 S    AERO 42 MPH S
2/14 53/33/43/+15/T/0.0/265/42       48 WNW  AERO 51 MPH WNW
2/15 33/16/25/-3/0.00/0.0/629/99     51 WNW  AERO 61 MPH WNW
2/16 39/15/27/-1/0.00/0.0/530/83     30 S    AERO 35 MPH S
2/17 59/34/47/+18/0.00/0.0/276/43    22 WSW
2/18 59/39/49/+20/0.05/0.0/238/37    56 W    AERO 65 MPH W   TSTM
2/19 45/14/30/+1/0.00/0.0/342/53     60 W    AERO 66 MPH W
2/20 33/13/23/-6/0.00/0.0/623/96     45 WNW  AERO 48 MPH WNW
2/21 27/11/19/-10/0.05/1.0/085/13    35 WNW  AERO 39 MPH NW
2/22 34/8/21/-9/0.00/0.0/654/100     28 WNW  AERO 29 MPH WNW
2/23 38/14/26/-4/0.00/0.0/657/100    24 WNW
2/24 42/22/32/+2/.../../.../..       31 S    AERO 33 MPH S
2/25 41/25/33/+2/1.63/1.5/000/00     50 WNW  AERO 56 MPH WNW
2/26 35/21/28/-3/.../.../.../..      36 W    AERO 39 MPH W
 
2/27 morning low temp: 27F; the normal low is now 23F
 
DAILY RECORDS FOR FEBRUARY 2011
None so far.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR FEBRUARY 27
HIGH 61F IN 1976
LOW -8F IN 1900
PRECIP 0.90 INCHES IN 1922
SNOWFALL 6.0 INCHES IN 1922
PEAK GUST 67 MPH W IN 1985
 
RECORDS FOR FEBRUARY 28
HIGH 62F IN 1976
LOW -2F IN 1907,1934
PRECIP 1.79 INCHES IN 1958
SNOWFALL 8.5 INCHES IN 2005
PEAK GUST 88e MPH SSW IN 1943

TODAY'S REPORT PREPARED BY: Eli Melaas