BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, AUGUST 8, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
BEAUTIFUL AUGUST DAY WITH EXCELLENT VISIBILITY...
There are just a few clouds in the mostly sunny
sky today.  The very low haze conditions, unusual 
for August, are partly due to dew points as low
as the middle 40s occurring today. Visibility 
has been excellent near 80 miles all morning.   

Today's observations:

7 A.M.   
Weather: Thin scattered cirrus, few distant altocumulus
Temperature: 60F, Dew point: 50F, Wind: WNW at 8 kts
Sea-level pressure: 30.22 inches Hg, rising
Visibility: 80 miles
6-hour minimum temp: 55F
BHO SA 1155 250 –SCT 80 233/60/50/2908/022/ FEW AC DSNT 
NNE-NE WND LGT/ 8/031 51014 10060 20055

10 A.M. 
Weather: Scattered cumulus, few cirrus S-NW
Temperature: 69F, Dew point: 44F, Wind: NNW at 8 kts 
Wind: Light and variable
Sea-level pressure: 30.24 inches Hg, rising
Visibility: 80 miles
BHO SA 1455 40 SCT 80 242/69/44/3308/024/ FEW CI S-NW 
WND LGT AND VRB/ 8/101 53009

  
WEATHER SUMMARY FOR FRIDAY, AUGUST 7

TEMPERATURE (DEGREES F)
MAX.....79    NORMAL.....81
MIN.....58    NORMAL.....62 
MEAN....69    NORMAL.....71

DEPARTURE FROM 30-YEAR AVERAGE..........-2
TOTAL DEPARTURE FOR THE MONTH...........+7  [+0.8 DEGREES/DAY]

HEATING DEGREE DATA WILL RESUME IN SEPTEMBER 

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............32 W   AT  4:14 P.M. 
                   AEROVANE..............30 W   AT  4:14 P.M.
                   ASOS..................31 WNW AT  4:14 P.M.   
                   DAVIS.................32 W   AT  3:43 P.M.
FASTEST MILE FOR YESTERDAY...............23 W   AT  3:45 P.M. * 
MAXIMUM 2-MINUTE ASOS AVERAGE............22 WNW AT  4:00 P.M.    
MAXIMUM 2-MINUTE DAVIS AVERAGE...........23 W   AT  4:00 P.M.
AVERAGE WIND SPEED AND DIRECTION.......12.6 W 
                   ASOS................11.6 
                   DAVIS...............12.9 WNW [283 DEG]
* last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00   DEPARTURE....-0.13
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH.........Trace   DEPARTURE....-0.88
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE YEAR..........31.26   DEPARTURE....+0.97
                         ASOS.............32.38 

PRELIMINARY CLIMATE SUMMARY FOR AUGUST 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

8/1  83/63/73/+1/0/823/95    18 SSE
8/2  77/64/71/-1/T/104/12    25 SSE
8/3  84/67/76/+4/0/638/74    17 SW 
8/4  83/66/75/+3/0/714/83    23 S
8/5  86/67/77/+5/T/378/44    27 SSW
8/6  76/61/69/-3/0/564/66    18 SSE
8/7  79/58/69/-2/0/.../..    32 W

8/8  morning low temp: 55F; the normal low is now 62F
 
NEW DAILY RECORDS FOR AUGUST 2009 TO DATE...
NONE
  
DAILY EXTREMES

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

RECORDS FOR AUGUST 8
HIGH 93F IN 1909,1949
LOW 47F IN 1903
PRECIP 3.08 INCHES IN 1976
PEAK GUST 45 MPH WNW IN 1958

RECORDS FOR AUGUST 9
HIGH 100F IN 1949
LOW 49F IN 1899
PRE 2.65 INS IN 1976
PEAK GUST 90 MPH SW IN 1968

TODAY'S REPORT PREPARED BY: Mike Iacono