BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, SEPTEMBER 13, 2008     
ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED  

HIGHER DEW POINTS RETURNING AFTER RAIN ON FRIDAY...
VERY LOW WINDS TODAY AVERAGING ONLY 2 MPH IN SIX HOURS...
Rainfall on Friday evening totaled 0.22 inch fell 
mostly between 5 PM and 10 PM EDT.  A wind gust to 33 mph
at 2:43 PM EDT was the peak for the day, and the average
wind speed on Friday was the highest for any day so far
this month at 16.3 mph.  Today, only 14 miles of air
passed the Observatory between 8 AM and 2 PM, with the
wind speed averaging 2.3 mph over that time.  The dew
point has climbed from the middle 50s yesterday to the 
middle 60s this afternoon. 
  
Today's observations:
 
8 A.M. EDT
Weather: Sky obscured in heavy fog
Temperature: 63F, Dew point: 63F,  Wind: WNW at 4 kts 
Sea-level pressure: 29.95 inches Hg, falling
Visibility: 45 miles   
6-hourly minimum temperature: 62F 
24-hourly rainfall: 0.22 inch
BHO SA 1155 W2 X 1/8F 141/63/63/2804/995/ WND LGT/ 8//// 
53007 70022 10063 20062

11 A.M. EDT
Weather: Broken stratocumulus, overcast cirrus
Temperature: 68F, Dew point: 64F, Wind: estimated NW at 2 kts
Wind: Light and variable
Sea-level pressure: 29.96 inches Hg, rising   
Visibility: 45 miles   
BHO SA 1455 E20 BKN 200 OVC 45 145/68/64/E3002/996/ 
BINOVC ALQDS HAZY WND LGT AND VRB/ 8/501 53004

2 P.M. EDT
Weather: Overcast stratocumulus with breaks and higher 
clouds visible
Temperature: 72F, Dew point: 65F, Wind: estimated NNE at 2 kts
Wind: Light and variable 
Sea-level pressure: 29.93 inches Hg, falling																						
Visibility: 45 miles  
6-hour max. temp: 72F 
BHO SA 1755 E25 OVC 45 136/72/65/E0202/993/ BINOVC NW-E 
HIR CLDS VSBL N-ENE HAZY WND LGT AND VRB/ 8/501 56009 10072 
20063


WEATHER SUMMARY FOR FRIDAY, SEPTEMBER 12

TEMPERATURE (DEGREES F)
MAX.....66    NORMAL.....72
MIN.....54    NORMAL.....54
MEAN....60    NORMAL.....63

DEPARTURE FROM 30-YEAR NORMAL.............-3 
TOTAL DEPARTURE FOR THE MONTH............+32 (+2.5 DEGREES/DAY)

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............33 S  AT  1:43 P.M. 
                   AEROVANE.............31 S  AT  1:41 P.M.          
                   ASOS.................33 S  AT  1:43 P.M. 
                   DAVIS................34 S  AT  1:41 P.M.
FASTEST MILE FOR YESTERDAY..............26 S  AT  1:42 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE...........26 S  AT  1:44 P.M.          
MAXIMUM 2-MINUTE DAVIS AVERAGE..........21 S  AT  1:44 P.M.         
                   AVERAGE............16.3 S  
                   ASOS...............15.7    
                   DAVIS..............13.2 S [181 deg]
* Last of several occurrences 
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.22   DEPARTURE.......+0.08  
                         ASOS..............0.22
TOTAL PRECIPITATION FOR  SEPT..............2.73   DEPARTURE.......+1.12 
                         ASOS..............2.74   
TOTAL PRECIPITATION FOR THE YEAR..........38.19   DEPARTURE.......+3.11  
                         ASOS.............40.74 #
#  Includes erroneous ASOS precipitation data on 2/13/08.
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2008 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized

9/1  81/57/69/+2/0.00/787/100    29 NW 
9/2  74/60/67/+1/0.00/604/77     27 N  
9/3  75/57/66/0/0.00/766/98      22 N 
9/4  85/62/74/+8/0.00/748/96     23 SSW
9/5  86/67/77/+12/0.00/575/74    32 SSE 
9/6  82/68/75/+10/1.88/039/05    44 SE   Aero 39 MPH SE * 
9/7  78/61/70/+5/0.31/655/85     43 NW   Aero 43 MPH NW *
9/8  78/58/68/+3/0.00/753/98     23 WSW
9/9  73/60/67/+3/0.32/054/07     43 SW   Aero 46 MPH SW TSTM #
9/10 68/52/60/-4/0.00/748/98     25 WNW    
9/11 69/48/59/-5/0.00/616/81     23 S
9/12 66/54/60/-3/0.22/.../..     33 S  

9/13 morning low temp. 62F; our normal low is now 54F

* Tropical Storm Hanna 
# Thunderstorm gust  

NEW DAILY RECORDS FOR SEPTEMBER

None to date..

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

RECORDS FOR SEPTEMBER 13
HIGH 91F IN 1957
LOW 40F IN 1985
PRECIP 3.10 INCHES IN 1987
PEAK GUST 44 MPH WNW IN 1986

RECORDS FOR SEPTEMBER 14
HIGH 90F IN 1931
LOW 34F IN 1911
PRECIP 4.38 INCHES IN 1944  (Great Atlantic Hurricane)
PEAK GUST 96e MPH E IN 1944 (Great Atlantic Hurricane)

TODAY'S REPORT PREPARED By: Mike Iacono