BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, SEPTEMBER 4, 2007    
ALL TIMES ARE IN EASTERN STANDARD TIME
 
VERY SUNNY, BUT COOLER TODAY AND CONTINUED VERY DRY
VISIBILITY UP TO 80 TO 90 MILES--DEWPOINTS IN 40's
 
Today is another day in our long, long stretch of dry weather 
days and again we have very sunny weather but much cooler weather 
than yesterday with temperatures in the middle 70's early
this afternoon after a high of 85F yesterday.  Dewpoints have 
been dropping through the 40's.  Visibility is back up to 
80 to 90 miles like it was just two days ago. 
 
Today's observations:
 
7 A.M.   
Weather: Clear, cirrus W-NNE increasing, light haze decreasing  
Temperature: 67F, Dew point: 55F, Wind: NW at 08 kts
Wind: gradually veering past hour 
Sea-level pressure: 29.96 inches Hg, rising
Visibility: 40 miles, 55 WNW, light haze dissipating
6-hour min temp: 63F
24-hour rainfall: 0.00 
BHO SA 1155 CLR 40 145/67/55/3208/996/ FEW ACSL E 
CI LYR W-NNE INCRSNG VSBY WNW 55 LGT HZ DSSPTNG 
WND GRDLY VEERING PST HR/ 8/045 51021 10067 20063 
 
10 A.M.   
Weather: Scattered dense cirrus, thin scattered cirrus 
Temperature: 72F, Dew point: 49F, Wind: WNW at 10 kts  
Wind: gust to 20 kts pst hour, variability W-NNW 
Sea-level pressure: 29.97 inches Hg, falling
Visibility: 40 miles with increasing light haze  
BHO SA 1455 220 SCT 250 –SCT 80 148/72/49/3010/997/ 
ACSL SE-SW PTCHS DNS CI/CC GST TO 20 KTS PST HR WND 27V34/ 
8/042 53003 
 
1 P.M.   
Weather: Scattered dense cirrus thin broken cirrus, few cumulus SSE-SW     
Temperature: 75F, Dew point: 44F, Wind: WNW at 11G18 kts  
Wind: Variability W-N
Sea-level pressure: 29.97 inches Hg, steady
Visibility: 90 miles  
6-hour max. temp: 76F   
BHO SA 1755 220 SCT 250 –SCT 300 –BKN 90 148/75/44/3011G18/997/ 
FEW SML CU SSE-SW FEW AC PTCHS DNS CI ALQDS GST TO 24 KTS PST HR
WND 26V35/ 8/142 50000 10076 20067 
 
WEATHER SUMMARY FOR MONDAY, SEPTEMBER 03 LABOR DAY
 
TEMPERATURE (DEGREES F)
MAX.....85    NORMAL.....75 
MIN.....57    NORMAL.....57
MEAN....71    NORMAL.....66
DEPARTURE FROM 30-YEAR NORMAL.........+5
TOTAL DEPARTURE FOR THE MONTH........ +5  [+1.5 deg/day] 
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............31 SSW AT 2:43 P.M. *   
                   AEROVANE...............28 SSW AT 2:43 P.M. *   
                   ASOS...................N/A  #
                   DAVIS..................36 SSW AT 2:43 P.M. 
FASTEST MILE FOR YESTERDAY............... 24 SSW AT 1:36 P.M.        
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............27 SSW AT 2:44 P.M. 
AVERAGE WIND SPEED AND DIRECTION......... 14.8 SSW 
                   ASOS...................N/A  #
                   DAVIS..................16.1 SSW [210 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....0.00  DEPARTURE.....-0.13
                         ASOS..............0.00 
TOTAL PRECIPITATION FOR THE MONTH..........0.00  DEPARTURE.....-0.39  
                         ASOS..............0.00    
TOTAL PRECIPITATION FOR THE YEAR..........30.99  DEPARTURE.....-2.87
                         ASOS.............30.23    
 
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/.../..     25 WNW  
9/2  78/51/65/-1/0/.../..     22 S 
9/3  85/57/71/+5/0/.../..     31 SSW AERO 28 MPH SSW
 
9/4  morning low temp. of 63F; normal low now 57F
 
NEW DAILY RECORDS FOR SEPTEMBER 2007: 
 
None to date 
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 4
HIGH 90F IN 1953, 1973
LOW 46F IN 1987
PRECIP 3.22 INCHES IN 1922
PEAK GUST 47 MPH SE IN 1966
 
RECORDS FOR SEPTEMBER 5
HIGH 90F IN 1971
LOW 45F IN 1906
PRECIP 1.37 INCHES IN 1907
PEAK GUST 46 MPH NW IN 1994
 
TODAY'S REPORT PREPARED By: Robert Skilling