BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, SEPTEMBER 23, 2006  
ALL TIMES ARE IN EASTERN STANDARD TIME

FALL BEGINS WITH AUTUMNAL EQUINOX TODAY...
COOL WITH OCCASIONAL SHOWERS AND LOW CLOUDS...
After several sunny days, low clouds and showers
predominate today with a gusty south wind.  Only a trace
of precipitation has been measured today through 2 PM
EDT.  The peak gust has been 42 mph S at 11:06 AM EDT. 
 
Today's observations:
																											
7 A.M.
Weather: Very light rain shower, and overcast with 
stratus fractus and nimbostratus
Temperature: 59F, Dew point: 56F, Wind: SSE at 14 kts 
Sea-level pressure: 29.99 inches Hg, rising 																		
Visibility: 20 miles
6-hourly min. temp. 56 deg.
6-hourly precipitation: trace 
BHO SA 1155 E40 OVC 20RW- 156/59/56/1614/999/ HIR CLDS VSBL 
DSNT NE-E VSBY WNW-NW 10 RWB52 RW W-NW MVNG ENE PCPN VRY LGT/ 
8/72/ 58014 6000/ 10059 20056

10 A.M.
Weather: Overcast with stratus fractus and nimbostratus
Temperature: 62F, Dew point: 60F, Wind: S at 19G28 kts   
Sea-level pressure: 29.89 inches Hg, falling																						
Visibility: 10 miles 
BHO SA 1455 E25 BKN 30 OVC 10 122/62/60/1719G28/989/ R-E30 PK 
WND 1728/47/ 8/72/ 56034 6000/

1 P.M.
Weather: Overcast with stratus
Temperature: 65F, Dew point: 61F, Wind: S at 19G28 kts
Sea-level pressure: 29.82 inches Hg, falling
Visibility: 10 miles 
6-hourly max. temp. 65 deg.
6-hourly precipitation: trace  
BHO SA 1755 E15 OVC 10 098/65/61/1919G28/982/ PK WND 1830/29/ 
8/7// 56024 6000/ 10065 20059


WEATHER SUMMARY FOR FRIDAY, SEPTEMBER 22

TEMPERATURE (DEGREES F)
MAX.....68   NORMAL.....69 
MIN.....47   NORMAL.....51   
MEAN....58   NORMAL.....60   
DEPARTURE FROM 30-YEAR NORMAL........-2
TOTAL DEPARTURE FOR THE MONTH........-3 (-0.3 DEGREE/DAY) [CORRECTED]

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.........23 S AT 9:05 P.M.*
                   AEROVANE..........23 S AT 6:45 P.M. 
                   ASOS..............22 S AT 6:46 P.M.    
                   DAVIS.............26 SSW AT 8:38 P.M.  
FASTEST MILE FOR YESTERDAY...........17 S AT 9:16 P.M.*    
MAXIMUM 2-MINUTE DAVIS AVERAGE.......20 SSW AT 9:17 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE........18 SSW AT 9:17 P.M.     
AVERAGE WIND SPEED AND DIRECTION....11.1 WSW  
                   ASOS.............11.1 
                   DAVIS............10.9 WSW 
* last of several occurrences

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M...trace   DEPARTURE....-0.14   
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE MONTH..........1.75   DEPARTURE....-1.26
                         ASOS..............1.72
TOTAL PRECIPITATION FOR THE YEAR..........45.31   DEPARTURE....+8.83
                         ASOS.............44.84


PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2006......CALENDAR DAY DATA
DATA REPORTED:
DATE  MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST

AERO: Aerovane recording wind system when significant
TSTM: Thunderstorm day
....: Data not yet available

9/1  68/57/63/-4/0/442/56      29 ENE   
9/2  63/58/61/-5/T/000/00      45 ENE  Aero 42 MPH ENE TD ERNESTO
9/3  68/58/63/-3/0.44/000/00   39 E    Aero 37 MPH E 
9/4  73/56/65/-1/0/519/66      31 WSW  Aero 30 MPH WSW   
9/5  71/56/64/-1/0.11/168/22   18 W 
9/6  73/59/66/+1/0/194/25      17 WSW
9/7  73/58/66/+1/0/723/94      17 S     
9/8  78/59/69/+4/0/631/82      22 SW   
9/9  82/61/72/+8/T/682/89      24 SSW    
9/10 65/51/58/-6/0/497/65      27 NE
9/11 63/47/55/-9/0/731/96      32 NE    
9/12 64/45/55/-8/0/735/97      28 NNE 
9/13 64/48/56/-7/T/119/16      23 SSE
9/14 70/56/63/0/0.30/0/0       24 SSE
9/15 69/59/64/+2/T/.../..      23 NE  
9/16 76/57/67/+5/0/.../..      18 N
9/17 79/58/69/+7/0/.../..      17 SE 
9/18 80/59/70/+9/0/.../..      24 S
9/19 79/61/70/+9/0.77/525/71   30 S  
9/20 70/53/62/+1/0.13/.../.. * 28 WSW  Aero 35 MPH WNW
9/21 63/48/56/-4/0/.../..      30 WNW  Aero 33 MPH WNW
9/22 68/47/58/-2/0/.../..      23 S 
9/23 ..overnight low 56
 
* Min temperature changed from 52 to 53 and mean from 61 to 62

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

RECORDS FOR SEPTEMBER 23
HIGH 93F IN 1895,1914
LOW  33F IN 1904
PRECIP 2.67 INCHES IN 1994
PEAK GUST 62 MPH SSW IN 1989

RECORDS FOR SEPTEMBER 24
HIGH 87F IN 1959
LOW  33F IN 1885,1950,1963
PRECIP 1.19 INCHES IN 1955
PEAK GUST 54e MPH SW IN 1940

TODAY'S REPORT BY: Mike Iacono