BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, OCTOBER 9, 2009  
ALL TIMES ARE IN EASTERN STANDARD TIME

Today's observations:

7 A.M. 
Weather: Overcast altostratus, bright spots in overcast NE-SE
Temperature: 51F, Dew point: 43F, Wind: SSE at 9 kts
Sea-level pressure: 30.01 inches Hg, falling
Visibility: 70 miles
6-hour minimum temp: 48F
BHO SA 1155 E100 OVC 70 162/51/43/1609/001/ 
BRGHT SPTS IOVC NE-SE THN K LYR N/ 
8/07/ 57005 10051 20048

10 A.M. 
Weather: Overcast altostratus
Temperature: 56F, Dew point: 49F, Wind: SSE at 11 kts
Sea-level pressure: 29.96 inches Hg, falling
Visibility: 70 miles
BHO SA 1455 E70 OVC 70 147/56/49/1611/996/ 8/07/ 58015

1 P.M.    
Weather: Overcast nimbostratus, few lower stratus
Temperature: 58F, Dew point: 55F, Wind: SSE at 13 kts
Sea-level pressure: 29.88 inches Hg, falling
Visibility: 10 miles, light rain
6-hour maximum temp: 58F
BHO SA 1755 E20 OVC 10R- 117/58/55/1613/988/ FEW LWR STRA/ 
8/72/ 58030 MANUAL 6000/ 10058 20051


WEATHER SUMMARY FOR THURSDAY, OCTOBER 8

TEMPERATURE (DEGREES F)
MAX.....61    NORMAL.....63
MIN.....48    NORMAL.....45
MEAN....55    NORMAL.....54

DEPARTURE FROM 30-YEAR AVERAGE...........+1
TOTAL DEPARTURE FOR THE MONTH............-1 [-0.3 DEGREES/DAY] 

HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............10  DEPARTURE.......-1
TOTAL HEATING UNITS FOR THE MONTH............77  DEPARTURE.......-2
TOTAL HEATING UNITS FOR THE SEASON..........234  DEPARTURE......-14
TOTAL HEATING UNITS LAST SEASON TO DATE.....209  DIFFERENCE.....+25

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............43 W   AT  8:35 A.M.
                   AEROVANE..............39 W   AT  8:35 A.M.
                   ASOS..................38 WNW AT  8:35 A.M. 
                   DAVIS.................41 W   AT  8:34 A.M.      
FASTEST MILE FOR YESTERDAY...............30 W   AT  8:32 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............28 NW  AT 10:19 A.M.         
MAXIMUM 2-MINUTE DAVIS AVERAGE...........30 W   AT  8:34 A.M.        
AVERAGE WIND SPEED AND DIRECTION.......14.3 W
                   ASOS................12.4
                   DAVIS...............14.9 W [279 DEG]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00   DEPARTURE....-0.14
                         ASOS..............0.00
TOTAL PRECIPITATION FOR MONTH..............1.80   DEPARTURE....+0.68
                         ASOS..............1.83
TOTAL PRECIPITATION FOR THE YEAR..........39.68   DEPARTURE....+0.96
                         ASOS.............40.89

PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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
 
10/1 56/39/48/-9/0/155/22     27 WSW  AERO 23 MPH WSW
10/2 60/40/50/-6/0/442/63     23 SSE  
10/3 63/51/57/+1/1.10/000/00  32 ESE  AERO 30 MPH ESE  
10/4 67/57/62/+6/0/202/29     21 WSW 
10/5 64/49/57/+2/0/595/86     33 W    AERO 31 MPH W 
10/6 65/45/55/0/0/628/91      25 W
10/7 67/51/59/+4/0.70/344/50  54 W    AERO 54 MPH W
10/8 61/48/55/+1/0/602/88     43 W

10/9 our morning low temp: 48F; the normal low is now 45F

NEW DAILY RECORDS FOR OCTOBER 2009
10/7: NEW RECORD WIND GUST 54 MPH W AT 2005E;
      surpasses previous record of 52 MPH ESE in 1972
  
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR OCTOBER 9
HIGH 81 IN 1909
LOW 29 IN 1907,1937
PRECIP 2.54 INCHES IN 1976
SNOWFALL 0.2 INCHES IN 1888
PEAK GUST 81e MPH S IN 1976 (RECORD FOR MONTH)

RECORDS FOR OCTOBER 10
HIGH 85 IN 1949
LOW 27 IN 1929
PRECIP 2.02 INCHES IN 1998
SNOWFALL 6.8 INCHES IN 1979 (RECORD FOR MONTH)
PEAK GUST 59 MPH WNW IN 1958

TODAY'S REPORT PREPARED BY: Stephanie Radner