BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, MAY 6, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
N-NNE WINDS GUSTING PAST 30 MPH EARLY THIS MORNING
A TRACE OF RAIN IN A LITTLE DRIZZLE AND VERY LIGHT SHOWERS
 
A cool and mostly dry airmass began arriving during 
the overnight with winds becoming increasingly gusty
from the north and north-northeast.  A peak gust of 
36 MPH N was recorded around 4:30 a.m. EDT this morning
and a few patches of drizzle and very light rain showers
were observed before 8 a.m.  

Today's observations:
 
7 A.M.   
Weather: Overcast stratocumulus, break in overcast 
distant WNW-NE, VIRGA distant E and S-SW
brief very light rain shower past hour  
Temperature: 42F, Dew point: 33F, Wind: NNE 15G25 kts 
Wind: Variability N-ENE 
Sea-level pressure: 30.38 inches Hg, rising
Visibility: 70 miles, 90 W-N and 30 S 
6-hour min. 42F 
6-hour precip: trace 
BHO SA 1155 22 SCT E28 OVC 70 287/42/33/0315G25/038/ 
BINOVC DSNT WNW-NE HIER CLD CIG RGD VSBY DSNT NE VIRGA 
DSNT E AND S-SW VSBY W-N 90 S 30 WND 35V07 RB15E30/ 
8/5// 53027 MANUAL 6000/ 10046 20042 
 
10 A.M.
Weather:  Broken clouds, cumulus and stratocumulus
Temperature: 46F, Dew point: 32F, Wind: NNE at 12G25 kts
Wind: Peak wind 27 kts NNE at 43 past the hour
Wind: Direction variability NNW-ENE  
Sea-level pressure: 30.44 Hg, rising   
Visibility: 80 miles  
BHO SA 1455 30 SCT E40 BKN 80 309/46/32/0212G25/044/ 
MDT CU PK WND 0227/43/ WND 34V07/ 8/400 51022 
 
WEATHER SUMMARY FOR SATURDAY, MAY 5
 
TEMPERATURE (DEGREES F)
MAX.....65    NORMAL.....63 
MIN.....45    NORMAL.....44
MEAN....55    NORMAL.....53
DEPARTURE FROM 30-YEAR NORMAL...........+2
TOTAL DEPARTURE FOR THE MONTH..........+13 (+2.4 DEGREES/DAY)
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY...........10  DEPARTURE.........-2
TOTAL HEATING UNITS FOR THE MONTH...........49  DEPARTURE........-14 
TOTAL HEATING UNITS FOR THE SEASON........5665  DEPARTURE.......-424
TOTAL HEATING UNITS LAST SEASON TO DATE...5478  DIFFERENCE......+187
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............33  N  AT  9:56 P.M. 
                   AEROVANE.............30  N  AT  9:56 P.M.  
                   ASOS.................29  N  AT  9:56 P.M.   
                   DAVIS................30 NNE AT 10:01 P.M.   
FASTEST MILE FOR YESTERDAY..............22  N  AT 10:01 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE...........21  NNE AT 9:22 P.M.  
MAXIMUM 2-MINUTE DAVIS AVERAGE..........22  NNE AT 9:22 P.M.   
AVERAGE WIND SPEED AND DIRECTION........9.5 WNW 
                    ASOS...............10.5      
                    DAVIS...............9.7 NW [310 degrees] 
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....trace  DEPARTURE....-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........0.06   DEPARTURE....-0.59 
                         ASOS..............0.04    
TOTAL PRECIPITATION FOR THE YEAR..........20.48   DEPARTURE....+1.88
                         ASOS.............20.01    
 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.......0.0
TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE......-0.1 
TOTAL SNOWFALL FOR THE SEASON..............27.6  DEPARTURE.....-32.5  
    
PRELIMINARY CLIMATE SUMMARY FOR MAY 2007......CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
 
AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available
 
5/1  67/44/56/+4/0/0/624/74      33 NW 
5/2  64/45/55/+3/0.06/0/381/45   36 NW    Aero 33 MPH WNW
5/3  67/42/55/+2/0/0/849/100     38 W     Aero 37 MPH W
5/4  66/44/55/+2/0/0/.../..      39 WNW   Aero 40 MPH WNW 
5/5  65/45/55/+2/0/0/.../..      33 N 
 
5/6  morning low temp. 42 deg; normal now 44 deg.; 
     a trace of rain; peak wind gust 36 MPH N 
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR MAY 6
HIGH 90F IN 1930
LOW  29F IN 1891
PRECIP 1.04 INCHES IN 1890
SNOWFALL TRACE IN 1917,1996
PEAK GUST 65 MPH SSE IN 1989
 
RECORDS FOR MAY 7
HIGH 93F IN 1930
LOW 33F IN 1970
PRECIP 1.19 INCHES IN 2005 
SNOWFALL TRACE IN 1967
PEAK GUST 66e MPH WNW IN 1940
 
TODAY'S REPORT PREPARED By: Robert Skilling