BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MARCH 11, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
LIGHT RAIN MIXED WITH SLEET LATE LAST EVENING
AND LIGHT AMOUNTS OF RAIN AND DRIZZLE TODAY
MINIMUM TEMPS. OF 42F EQUALED OUR DAILY
RECORD HIGH MINIMA FOR BOTH 3/7 & 3/8
 
Precipitation began Tuesday evening around
midnight and there was ice pellets mixed with
the rain for a time.  The rain was light and
the temperature was around 33F around the time
precipitation began.  Rising temperatures early
today along with a high of 42F on Tuesday has
melted away most of the 3 inches of snow which
was reported on the ground yesterday morning.
Minimum temperatures of 42F on March 7 and 8
have equaled high minimum records for the dates.
 
Today's observations:
 
7 A.M.
Weather: Obscurement with heavy fog, very light
rain shower past hour, stratus drifting over summit
Temperature: 36F, Dew point: 36F, Wind: SE at 17G26 kts,
Wind: Peak wind gust 27 kts SE @ 6:27 a.m.
Sea-level pressure: 30.12 inches Hg, falling RAPIDLY
Visibility: 1/8 heavy fog, briefly 1 mile SE-SW
6-hour minimum temperature: 33F
6-hour precip: 0.09 in.  
24-hour precip: 0.12 in. 
Snow depth on ground: trace
BHO SA 1155 W3 X 1/8F 200/36/36/1317G26/012/
STRA DRFTG OVR SMT VSBY BRFLY 1 SE-SW
PK WND 1427/27/ PRESFR RB30E35/ 8////
58039 ASOS 60009 MANUAL 6009/ ASOS 70012
MANUAL 70012 10036 20033
 
10 A.M.
Weather: Obscurement with heavy fog, light drizzle
ended past hour, stratus drifting over summit  
Temperature: 42F, Dew point: 42F, Wind: SSE at 20G28 kts,
Wind: Peak wind gust 31 kts SSE @ 9:29 a.m. 
Sea-level pressure: 30.01 inches Hg, falling
Visibility: 1/8 mile, occasionally 1 1/2 miles
BHO SA 1455 W3 X 1/8F 164/42/42/1620G28/001/
STRA DRFTG OVR SMT VSBY SE-SW OCNL 11/2
PK WND 1531/29/ LEUKN/ 8//// 58036 ASOS 60001 MANUAL 6000/
 
1 P.M.  
Weather: Obscurement with heavy fog, rain ended at
12:40 p.m., stratus drifting over summit  
Temperature: 47F, Dew point: 47F, Wind: S at 22G34 kts,
Wind: Peak wind gust 37 kts S @ 12:01 p.m.,
Wind: direction variability SE to SSW 
Sea-level pressure: 29.90 inches Hg, falling
Visibility: 1/2 variable 1/8 to 1 mile, SE-SW 11/2 miles
6-hour maximum temperature: 47F
6-hour rainfall: 0.03 inch
BHO SA 1755 W3 X 1/2VF 125/47/47/1722G34/990/
STRA DRFTG OVR SMT VSBY 1/8V1 SE-SW 11/2
PK WND 1737/01/ WND 14V20 REB10E40/ 8////
58039 ASOS 60006 MANUAL 6003/ 10047 20036
 
WEATHER SUMMARY FOR TUESDAY, MARCH 10, 2009
 
TEMPERATURE (DEGREES F)
MAX.....42    NORMAL.....43
MIN.....26    NORMAL.....26
MEAN....34    NORMAL.....34
 
DEPARTURE FROM 30-YEAR NORMAL...................0
TOTAL DEPARTURE FOR THE MONTH.................-12 [-1.4 DEGREES/DAY] 
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY.............31  DEPARTURE......... 0
TOTAL HEATING UNITS FOR THE MONTH............332  DEPARTURE........+10
TOTAL HEATING UNITS FOR THE SEASON..........4859  DEPARTURE........-33
TOTAL HEATING UNITS LAST SEASON TO DATE.....4524  DIFFERENCE......+335
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............23 SSE AT  9:26 P.M.
                   AEROVANE.............22 SSE AT  9:26 P.M.
                   ASOS.................22 SSE AT  9:26 P.M. 
                   DAVIS................24 SE  AT  9:05 P.M. 
FASTEST MILE FOR YESTERDAY..............16 SSE AT  9:26 P.M. * 
MAXIMUM 2-MINUTE ASOS AVERAGE...........17 SSE AT  9:06 P.M. 
MAXIMUM 2-MINUTE DAVIS AVERAGE..........18 SE  AT  9:06 P.M. .
                   AVERAGE............ 8.0 NNW   
                   ASOS................7.8
                   DAVIS...............7.0 N/A
* last of several occurrences..
  
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.12 DEPARTURE.........-0.03
                         ASOS...............0.12
TOTAL PRECIPITATION FOR THE MONTH...........2.38 DEPARTURE.........+0.88
                         ASOS...............2.26
TOTAL PRECIPITATION FOR THE YEAR............8.91 DEPARTURE.........-1.43
                         ASOS...............9.88 #
# Includes erroneous ASOS precipitation data on 1/1/09, 1/2/09 and 2/27/09.
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M.........trace  DEPARTURE.........-0.4
TOTAL SNOWFALL FOR THE MONTH...............13.4   DEPARTURE.........+8.8
TOTAL SNOWFALL FOR THE SEASON..............78.7   DEPARTURE........+28.7
 
PRELIMINARY CLIMATE SUMMARY FOR MARCH 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
3/1  28/21/25/-7/0.26/1.9/000/00     38 NNE
3/2  22/15/19/-13/1.16/8.2/000/00    40 NNE    AERO 37 MPH NNE
3/3  25/11/18/-14/0.01/0.1/640/94    33 NW
3/4  30/6/18/-14/0/0/684/100         31 WNW
3/5  39/16/28/-5/0/0/659/96          25 WSW
3/6  49/30/40/+7/T/0/.../..          43 S      AERO 41 MPH S
3/7  60/42/51/+18/0.06/0/.../.. *    37 S
3/8  57/42/50/+16/0/0/.../..    *    39 WNW    AERO 40 MPH WNW
3/9  42/28/35/+1/0.72/3.2/000/00     33 N
3/10 42/26/34/0/0/0/.../..           23 SSE
 
3/11 morning low temp: 33F; our normal low is now 26F
 
* low temperatures on 3/7 and 3/8 both equaled the
  record high minima for the dates (see below)
 
NEW DAILY RECORDS FOR MARCH 2009...
3/2: DAILY SNOWFALL 8.2 INS. SURPASSES PREVIOUS
     RECORD OF 7.1 INS. IN 1948
3/7: DAILY MINIMUM 42 TIES RECORD HIGH MINIMUM FOR DATE
     PREVIOUSLY SET IN 1974 AND 1987
3/8: DAILY MINIMUM 42 TIES RECORD HIGH MINIMUM FOR DATE
     PREVIOUSLY SET IN 1995
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MARCH 11
HIGH 65 IN 1967
LOW 4 IN 1939, 1960
PRECIP 2.11 INS. IN 1901
SNOWFALL 6.3 INS. IN 1934
PEAK GUST 66e MPH W IN 1980
 
RECORDS FOR MARCH 12
HIGH 67 IN 1977
LOW 2 IN 1885
PRECIP 2.87 INS. IN 1888
SNOWFALL 9.7 INS. IN 1959
PEAK GUST 66 MPH SE IN 1962
 
TODAY'S REPORT PREPARED BY: Robert Skilling