BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, SEPTEMBER 5, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:

7 A.M.   
Weather: Scattered altocumulus, broken altocumulus,
few stratocumulus castellanus W-WNW, few cirrus, hazy
Temperature: 63F, Dew point: 58F, Wind: NNW at 9 kts
Sea-level pressure: 30.12 inches Hg, rising
Visibility: 40 miles, hazy
6-hour minimum temp: 59F
BHO SA 1155 75 SCT E100 BKN 130 BKN 40 199/63/58/3309/012/ 
FEW SCCAS W-WNW FEW CI HAZY/ 8/071 51017 10065 20059

10 A.M. 
Weather: Scattered altocumulus, broken altocumulus,
broken cirrus, cumulus building distant WNW-NW, hazy
Temperature: 72F, Dew point: 59F, Wind: NNE at 6 kts
Wind: Light and variable
Sea-level pressure: 30.08 inches Hg, falling
Visibility: 40 miles, hazy
BHO SA 1455 130 SCT E150 BKN 250 BKN 40 186/72/59/0206/008/ 
CU BLDG DSNT WNW-NW HAZY WND LGT AND VRB/ 8/071 51013

1 P.M. 
Weather: Scattered cumulus, scattered altocumulus, 
thin broken cirrus, few moderate cumulus NW. hazy
Temperature: 77F, Dew point: 56F, Wind: NE at 2 kts (estimated)
Wind: Light and variable
Sea-level pressure: 30.07 inches, falling 
Visibility: 40 miles, hazy
6-hour max. temp: 78F
BHO SA 1755 40 SCT 150 SCT 250 -BKN 40 184/77/56/0402E/007/ 
FEW MDT CU NW WND LGT AND VRB HAZY/ 8/171 58002 10078 20063

WEATHER SUMMARY FOR FRIDAY, SEPTEMBER 4

TEMPERATURE (DEGREES F)
MAX.....77    NORMAL.....75
MIN.....60    NORMAL.....57 
MEAN....69    NORMAL.....66
 
DEPARTURE FROM 30-YEAR AVERAGE...........+3
TOTAL DEPARTURE FOR THE MONTH............-3 [-0.9 DEGREES/DAY] 

HEATING DEGREE DATA WILL RESUME IN SEPTEMBER 

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............18 NE  AT 11:28 A.M.
                   AEROVANE..............15 NE  AT 11:28 A.M.
                   ASOS..................16 ENE AT 11:28 A.M.
                   DAVIS................ 16 NE  AT 10:53 A.M.
FASTEST MILE FOR YESTERDAY...............10 NE  AT  1:33 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............10 ENE AT  3:21 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE...........11 SSW AT 12:01 A.M.
AVERAGE WIND SPEED AND DIRECTION........7.6 NE
                   ASOS.................7.0
                   DAVIS................7.0 NNE [025 DEG]
 
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 MONTH..............0.00   DEPARTURE....-0.52
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE YEAR..........34.77   DEPARTURE....+0.78
                         ASOS.............35.92 

PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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

9/1  71/51/61/-6/0/.../..     17 NW 
9/2  76/54/65/-1/0/.../..     22 S
9/3  77/56/67/+1/0/.../..     19 SW
9/4  77/60/69/+3/0/.../..     18 NE

9/5  morning low temp: 59F; the normal low is now 57F 
 
NEW DAILY RECORDS FOR SEPTEMBER 2009 TO DATE...
None.
  
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR SEPTEMBER 5
HIGH 90F IN 1971
LOW 45F IN 1906
PRECIP 1.37 INCHES IN 1907
PEAK GUST 46 MPH NW IN 1994

RECORDS FOR SEPTEMBER 6
HIGH 92F IN 1900
LOW 39F IN 1888
PRECIP 3.19 INCHES IN 1890
PEAK GUST 78e MPH SE IN 1979 (TROPICAL STORM DAVID)

TODAY'S REPORT PREPARED BY: Mike Iacono