BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 12, 2007    
ALL TIMES ARE IN EASTERN STANDARD TIME
 
HEAVIEST DAILY RAINFALL SINCE JUNE 4TH 
PUTS AN END TO LONG RECORD DRY SPELL
 
The heaviest rainfall in one day since June 4th brought
1.34 inches yesterday and the downpours produced 0.48 inch
in one hourly period ending 1:20 p.m. EDT. The maximum 
amount for two hours was 0.67 inch ending at about 4:25 p.m.
EDT. The rain put an end to the driest stretch of weather at
this time of year as shown below:
 
Lowest Aug 1 - Sep 10 Precipitation (inches)
 
1) 0.82 in 2007 (through Sep 10)
2) 1.22 in 1981
3) 1.32 in 1948
4) 1.36 in 1900

 
Today's observations:
 
7 A.M.   
Weather: Clear, few stratocumulus WSW-N and cirrus distant SSE 
Temperature: 58F, Dew point: 52F, Wind: WSW at 16G25 kts 
Wind: peak wind 27 kts WSW at 39 mins. past the hour, variability SSW-W 
Sea-level pressure: 29.77 inches Hg, rising
Visibility: 50 miles    
6-hour min temp: 55F
24-hour rainfall: 1.34 ins. 
BHO SA 1155 CLR 50 081/58/52/2516G25/977/ FEW SC WSW-N 
FEW CI DSNT SSE PK WND 2527/39/ WND 21V27/ 8/501 53026 
ASOS 70137 MANUAL 70134 10062 20055 
  
10 A.M.   
Weather: Scattered stratocumulus clouds  
Temperature: 65F, Dew point: 47F, Wind: WSW at 19G30 kts 
Wind: peak wind W at 30 kts at 49 past the hour, variability SSW-W 
Sea-level pressure: 29.83 inches Hg, rising
Visibility: 70 miles  
BHO SA 1455 42 SCT 70 103/65/47/2519G30/983/ MTN INCLD 70 NW 
PK WND 2630/49/ WND 21V27/ 8/500 51022
 
1 P.M.   
Weather: Scattered occassionaly broken cu/stratocumulus  
Temperature: 71F, Dew point: 47F, Wind: W at 14G26 kts
Wind: peak wind 30 kts W at 30 past the hour, variability WSW-WNW 
Sea-level pressure: 29.89 inches Hg, rising
Visibility: 90 miles 
BHO SA 1755 50 SCT 90 123/71/47/2714G26/989/ 
SCT OCNL BKN PK WND 2730/30/ WND 24V30/ 
8/400 51020 10071 20058
 
WEATHER SUMMARY FOR TUESDAY, SEPTEMBER 11
 
TEMPERATURE (DEGREES F)
MAX.....68    NORMAL.....73 
MIN.....58    NORMAL.....55
MEAN....63    NORMAL.....64
DEPARTURE FROM 30-YEAR NORMAL.........-1 
TOTAL DEPARTURE FOR THE MONTH........+33  [+2.8 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............30 WNW AT 2:57 P.M. *    
                   AEROVANE...............29 WNW AT 2:57 P.M. *      
                   ASOS...................N/A  #
                   DAVIS..................31 W   AT 2:56 P.M.  
FASTEST MILE FOR YESTERDAY............... 24 WNW AT 2:57 P.M.        
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............24 SSW AT 10:50 P.M.   
AVERAGE WIND SPEED AND DIRECTION..........9.3 S 
                   ASOS...................N/A  #
                   DAVIS..................8.6 ESE [110 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... 1.34  DEPARTURE.....+1.20
                         ASOS..............1.37 
TOTAL PRECIPITATION FOR THE MONTH..........1.53  DEPARTURE.....+0.06  
                         ASOS..............1.56    
TOTAL PRECIPITATION FOR THE YEAR..........32.52  DEPARTURE.....-2.42
                         ASOS.............31.79    
 
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    25 WNW   
9/2  78/51/65/-1/0/787/100    22 S   
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/.../..    31 S #  TSTM *
9/9  72/57/65/+1/0.16/000/00  28 NNE  TSTM *
9/10 66/57/62/-2/0.03/000/00  18 NNE
9/11 68/58/63/-1/1.34/000/00  30 WNW 
 
9/12 morning low temp. 55F; normal low now 54F
 
# error corrected for wind gust from 43 mph to 31 mph S for 8th 
* thunderstorm days added...
 
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 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)
 
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
 
TODAY'S REPORT PREPARED By: Robert Skilling