BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, AUGUST 5, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
HIGH TEMPERATURE OF 86F EQUALS SUMMER MAXIMUM
VERY WARM AND HUMID TODAY WITH THUNDERSTORMS
DEVELOPING TO OUR WEST THREATENING LATER TODAY
 
Our high temperature of 86F just after 1:30 p.m.
EDT has equaled the highest for this cool summer
to date.  A high of 86F was recorded on two days
during July after a very low maximum of 79F
during June.
Thunderstorms were forming to our west early this
afternoon and heading east with a severe thunder-
storm warning issued in Worcester County by 2 p.m.
The airmass is primed for thunderstorms with
the air temperature in the mid-80's and dew points
in the upper 60's to 70F ahead of an approaching
cold front.
 
Today's observations:
 
7 A.M.  
Weather: Low overcast stratus with thin spots and
few breaks in overcast  
Temperature: 73F, Dew point: 71F, Wind: SSW at 14 kts,
Wind: gust to 20 kts past hour
Sea-level pressure: 29.89 inches Hg, rising
Visibility: 4 miles, thin fog
6-hour minimum temp: 68F
BHO SA 1155 7 SCT E11 OVC 4F 123/73/71/2014/989/
THN SPTS AND OCNL BINOVC GST TO 20 KTS PST HR/
8/6// 51008 10073 20068
 
10 A.M.
Weather: High thin scattered cirrus clouds 
Temperature: 83F, Dew point: 70F, Wind: SSW at 9 kts
Sea-level pressure: 29.88 inches Hg, falling
Visibility: 9 miles, hazy 
BHO SA 1455 300 –SCT 9 119/83/70/2009/988/
CUFRA/CU FRMG HAZY/ 8/101 56004
 
1 P.M.  
Weather: Scattered cumulus, few moderate cumulus and
few towering cumulus, high dense cirrostratus overcast 
Temperature: 85F, Dew point: 69F, Wind: SW at 12G21 kts,
Wind: direction variability S to WSW
Sea-level pressure: 29.84 inches Hg, falling
Visibility: 12 miles, hazy  
6-hourly max. temp: 86F 
BHO SA 1755 42 SCT E220 OVC 12 106/85/69/2212G21/984/
MDT CU FEW TCU HAZY WND 18V24/
8/207 56013 10086 20073
 
WEATHER SUMMARY FOR TUESDAY, AUGUST 4
 
TEMPERATURE (DEGREES F)
MAX.....83    NORMAL.....81
MIN.....66    NORMAL.....63
MEAN....75    NORMAL.....72
 
DEPARTURE FROM 30-YEAR AVERAGE..........+3
TOTAL DEPARTURE FOR THE MONTH...........+7  [+1.6 DEGREES/DAY]
 
HEATING DEGREE DATA WILL RESUME IN SEPTEMBER
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............23 S   AT 10:25 P.M. *     
                   AEROVANE..............22 S   AT 10:25 P.M. *
                   ASOS..................22 S   AT 10:26 P.M.  
                   DAVIS.................24 SSW AT 10:13 P.M.    
FASTEST MILE FOR YESTERDAY...............18 S   AT  8:56 P.M.   
MAXIMUM 2-MINUTE ASOS AVERAGE............18 S   AT  8:56 P.M.   
MAXIMUM 2-MINUTE DAVIS AVERAGE...........19 SSW AT 10:11 P.M.    
AVERAGE WIND SPEED AND DIRECTION........9.6 S 
                   ASOS................10.1   
                   DAVIS................9.2 SSW [200 DEG]
* last of several occurrences...
 
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..........trace  DEPARTURE....-0.49
                         ASOS..............0.00
TOTAL PRECIPITATION FOR THE YEAR..........31.26   DEPARTURE....+1.36
                         ASOS.............32.38
            
PRELIMINARY CLIMATE SUMMARY FOR AUGUST 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
8/1  83/63/73/+1/0/.../..    18 SSE
8/2  77/64/71/-1/T/.../..    25 SSE
8/3  84/67/76/+4/0/.../..    17 SW
8/4  83/66/75/+3/0/.../..    23 S
 
8/5  our morning low temp: 68F; the normal low is now 62F
 
NEW DAILY RECORDS FOR AUGUST 2009 TO DATE...
NONE
 
DAILY EXTREMES
 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR AUGUST 5
HIGH 98F IN 1955
LOW 48F IN 1929,1972
PRECIP 3.03 INCHES IN 1893
PEAK GUST 60e MPH SW 1977
 
RECORDS FOR AUGUST 6
HIGH 95F IN 1931
LOW 48F IN 1934
PRECIP 1.47 INCHES IN 1995
PEAK GUST 44e MPH SSW IN 1940
 
TODAY'S REPORT PREPARED BY: Robert Skilling