BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, MARCH 13, 2010  
ALL TIMES ARE IN EASTERN STANDARD TIME 

LIGHT RAIN AND INCREASING WINDS TODAY...
A few light rain showers on Friday turned to light rain
after 2 AM this morning, bringing just a trace of rainfall
through 7 AM.  Steady light rain after 7 AM has brought
a total of 0.28 inches for the six hours ending at 1 PM.
Northeast winds have continued increasing since yesterday 
with the highest hourly average of 27 mph occuring from 
1-2 PM today. The peak gust for today of 46 mph NE was 
measured at 1:28 PM.  
 
EASTERN DAYLIGHT SAVING TIME BEGINS TONIGHT...
Remember to turn clocks ahead one hour by 2 AM on Sunday
as we return to Daylight Saving Time.  

Today's observations:
 
7 A.M.
Weather: Scattered stratus, broken stratocumulus, 
overcast nimbostratus, light rain and thin fog
Temperature: 37F, Dew point: 33F, Wind: NE at 17G26 kts 
Wind: Peak gust 27 kts, NE at 6:44 AM
Sea-level pressure: 30.20 inches Hg, steady
Visibility: 10 miles, visibility N-NE 20
6-hour minimum temp: 37F
6-hour precip: Trace
24 hour precip: Trace
BHO SA 1155 30 SCT E35 OVC 10R- 227/37/33/0517G26/020/ 
VSBY N-NE 20 PK WND 0527/44/ 8/52/ 55000 6000/ 10037 20037

10 A.M. 
Weather: Broken stratus, broken stratocumulus, overcast
nimbostratus, light rain and fog
Temperature: 37F, Dew point: 37F, Wind: ENE at 22G32 kts,
Wind: Peak gust 32 kts, NE at 9:47 AM
Wind: Direction variable NNE to E
Sea-level pressure: 30.18 inches Hg, falling
Visibility: 6 miles, light rain and fog
3-hour precipitation: N/A
BHO SA 1455 E5 BKN 10 BKN 35 OVC 6R-F 221/37/37/0622G32/018/ 
CIG RGD FEW STFRA PK WND 0632/47 WND 03V09/ 8/62/ 56006 600//

1 P.M.  
Weather: Broken stratus, overcast nimbostratus, light rain
and fog
Temperature: 38F, Dew point: 37F, Wind: NE at 20G34 kts
Wind: Peak gust 37 kts, NE at 12:12 PM
Wind: Direction variable NNE to E
Sea-level pressure: 30.11 inches Hg, falling
Visibility: 3 miles
6-hour max. temp: 38F  
6-hour min. temp: 36F
6-hour precipitation: 0.28 inch
BHO SA 1755 –X E4 BKN 10 OVC 3R-F 198/38/37/0520G34/011/ F2 
PK WND 0537/12 WND 02V08/ 8/52/ 58023 6028/ 10038 20036


WEATHER SUMMARY FOR FRIDAY, MARCH 12
 
TEMPERATURE (DEGREES F)
MAX.....45     NORMAL.....43
MIN.....36     NORMAL.....27
MEAN....41     NORMAL.....35
 
DEPARTURE FROM 30-YEAR AVERAGE..............+6
TOTAL DEPARTURE FOR THE MONTH..............+72 [+5.8 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............24    DEPARTURE........-6
TOTAL HEATING UNITS FOR THE MONTH...........308    DEPARTURE.......-74
TOTAL HEATING UNITS FOR THE SEASON.........4708    DEPARTURE......-244
TOTAL HEATING UNITS LAST SEASON TO DATE....4915    DIFFERENCE.....-207
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............26 NE  AT 11:47 P.M. 
                   AEROVANE..............25 NE  AT  1:55 P.M. 
                   ASOS..................26 ENE AT 11:47 P.M.
                   DAVIS.................25 NE  AT  4:07 P.M. 
THE FASTEST MILE FOR YESTERDAY...........19 NE  AT 11:47 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............20 ENE AT  1:51 P.M.            
MAXIMUM 2-MINUTE DAVIS AVERAGE...........19 NE  AT  1:51 P.M.             
AVERAGE WIND SPEED AND DIRECTION..........13.1 NE
                   ASOS...................13.2
                   DAVIS..................12.8 NE [47 DEG] 
* last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....Trace  DEPARTURE....-0.15
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH .........0.85   DEPARTURE....-0.95
                         ASOS..............0.80 
TOTAL PRECIPITATION FOR THE YEAR ..........9.95   DEPARTURE....-0.69
                         ASOS..............9.92
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE......-0.4
TOTAL SNOWFALL FOR THE MONTH............... 7.3  DEPARTURE......+1.9
TOTAL SNOWFALL FOR THE SEASON THRU FEB.....63.8  DEPARTURE.....+13.0
 
PRELIMINARY CLIMATE SUMMARY FOR MARCH 2010 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
 
3/1  44/33/38/+6/0.38/3.2/047/07    43 NW    AERO 42 MPH NW
3/2  43/32/38/+6/0/0/352/52         22 NNE
3/3  34/31/33/+1/0.18/1.7/000/00    45 NNE   AERO 43 MPH NNE  
3/4  33/30/32/-1/0.19/1.9/000/00    32 NNW
3/5  39/28/34/+1/0.06/0.5/226/33    28 N 
3/6  54/27/41/+8/0/0/689/100        25 WNW 
3/7  55/31/43/+10/0/0/684/99        28 W 
3/8  58/36/47/+13/0/0/680/98        38 W 
3/9  51/32/42/+8/0/0/656/94         31 WNW
3/10 53/30/42/+8/0/0/.../..         19 SE
3/11 46/35/41/+6/0.04/0/.../..      17 ENE   
3/12 45/36/41/+6/T/0/.../..         26 NE    

3/13 our morning low temp: 36F; the normal low is now 27F 
 
NEW DAILY RECORDS FOR MARCH 2010
None. 

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

RECORDS FOR MARCH 13
HIGH 72 IN 1990
LOW -1 IN 1885
PRECIP 2.47 INS. IN 1993
SNOWFALL 10.0 INS. IN 1993
PEAK GUST 76 MPH ENE IN 1993 [THE "STORM OF THE CENTURY"]

RECORDS FOR MARCH 14
HIGH 74 IN 1946
LOW 8 IN 1926
PRECIP 1.72 INS. IN 1984
SNOWFALL 6.7 INS. IN 1958
PEAK GUST 66 MPH WNW IN 1982

TODAY'S REPORT PREPARED BY: Mike Iacono, Sean Fankhauser