BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, SEPTEMBER 11, 2007    
ALL TIMES ARE IN EASTERN STANDARD TIME
 
LIGHT RAINFALL BY NOON TODAY
 
Low clouds and fog obscured the summit since late yesterday 
and light rain began before 11 a.m. today amounting to 
almost a quarter of an inch by early this afternoon.    
 
Today's observations:
 
7 A.M.   
Weather: Sky obscured with fog   
Temperature: 59F, Dew point: 59F, Wind: ENE at 09 kts 
Sea-level pressure: 29.88 inches Hg, falling
Visibility: 1/16 mile in heavy fog   
6-hour min temp: 58F
24-hour rainfall: 0.03 in. 
BHO SA 1155 W2 X 1/16F 117/59/59/0709/988/ 
8//// 58013 MANUAL 6000/ ASOS 70003 
MANUAL 70003 10059 20058  
 
10 A.M.   
Weather: Sky obscured with fog with light rain   
Temperature: 61F, Dew point: 61F, Wind: E at 08 kts 
Sea-level pressure: 29.81 inches Hg, falling
Visibility: 1/16 mile in heavy fog 
BHO SA 1455 W2 X 1/16R-F 095/61/61/0808/981/ 
RB40/ 8//// 58022 MANUAL 6000/ 
 
WEATHER SUMMARY FOR MONDAY, SEPTEMBER 10
 
TEMPERATURE (DEGREES F)
MAX.....66    NORMAL.....73 
MIN.....57    NORMAL.....55
MEAN....62    NORMAL.....64
DEPARTURE FROM 30-YEAR NORMAL.........-2 
TOTAL DEPARTURE FOR THE MONTH........+34  [+3.2 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............21 NNE AT 7:25 P.M. *    
                   AEROVANE...............15 NNE AT 7:25 P.M. *      
                   ASOS...................N/A  #
                   DAVIS..................18 NE  AT 5:54 P.M.  
FASTEST MILE FOR YESTERDAY............... 13 NE  AT 7:23 P.M.       
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............13 NE AT 6:29 P.M.  
AVERAGE WIND SPEED AND DIRECTION..........6.3 NE  
                   ASOS...................N/A  #
                   DAVIS..................5.7 NE [040 deg]    
* last of several occurrences...
 
# ASOS WINDS SWITCHED OFF BY NWS 6/6, IT IS NOT KNOWN WHEN 
  THAT DATA WILL RESUME
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.03  DEPARTURE.....-0.11
                         ASOS..............0.03 
TOTAL PRECIPITATION FOR THE MONTH..........0.19  DEPARTURE.....-1.15  
                         ASOS..............0.19    
TOTAL PRECIPITATION FOR THE YEAR..........31.18  DEPARTURE.....-3.63
                         ASOS.............30.42    
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2007...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  79/57/68/+1/0/790/100      
9/2  78/51/65/-1/0/787/100      
9/3  85/57/71/+5/0/760/97     31 SSW AERO 28 MPH SSW 
9/4  76/61/69/+3/0/641/82     28 NW  AERO 26 MPH NW
9/5  74/53/64/-1/0/732/94     21 ESE 
9/6  76/55/66/+1/0/.../..     31 S
9/7  92/62/77/+12/0/657/85    30 SSW
9/8  93/67/80/+15/0/.../..    43 S
9/9  72/57/65/+1/0.16/000/00  28 NNE AERO 24 MPH NNE
9/10 66/57/62/-2/0.03/000/00 
 
9/11 morning low temp. of 58F; normal low now 55F
 
NEW DAILY RECORDS FOR SEPTEMBER 2007: 
 
9/7 - RECORD HIGH TEMPERATURE 92; PREVIOUS 91 IN 1945.
9/8 - RECORD HIGH TEMPERATURE 93; PREVIOUS 91 IN 1945.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 11
HIGH 93F IN 1983
LOW 37F IN 1917
PRECIP 5.23 INCHES IN 1954 (HURRICANE EDNA)
PEAK GUST 101 MPH NW IN 1954 (HURRICANE EDNA)
 
RECORDS FOR SEPTEMBER 12
HIGH 92F IN 1961
LOW 42F IN 1958,1967,1985
PRECIP 2.79 INCHES IN 1960 (HURRICANE DONNA)
PEAK GUST 140 MPH SSE IN 1960 (HURRICANE DONNA)
 
TODAY'S REPORT PREPARED By: Robert Skilling