BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, AUGUST 11 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
BRIEF THUNDERSHOWER LATE LAST NIGHT
LEAVES VERY LITTLE RAINFALL
AUGUST TEMPS NEAR NORMAL BUT 
RAINFALL IS WELL BELOW NORMAL    
 
A late evening thunderstorm brought a
briefly heavy rain shower with a total
of just 0.09 in. measured here. Last
night was the warmest night of the summer
to date with temperatures not dropping
below 72F.  In fact much of the night
the reading was 73 to 75F along with
very high humidity.  August temperatures
are now within a fraction of a degree
of normal but precipitation is more than
one inch below normal.  A wind shift to
northeast late this morning. Today's
maximum temperature (84F) occurred at 11:06 a.m.
EDT just ahead of the passage of a back-
door cold front at 11:25 a.m.
  
Today's observations:
 
7 A.M.  
Weather: Thin scattered cirrostratus, few dissipating
altocumulus of a chaotic sky and few dissipating
altocumulus castellanus (ESE-SSE past hour) 
Temperature: 76F, Dew point: 72F, Wind: W at 7 kts
Sea-level pressure: 29.79 inches Hg, falling slightly
Visibility: 9 miles, thin fog all quadrants
6-hour minimum temp: 73F
BHO SA 1155 300 –SCT 9 088/76/72/2807/979/
FEW AC CHAOTIC DSSPTNG FEW ACC DSSPTD ESE-SE
FEW LWR CI SKY CLRG PST HR THN FG ALQDS/ 8/098 50002
MANUAL 70009 ASOS 70009 10076 20073
 
10 A.M.
Weather: Scattered cumulus, broken cumulus, broken
cirrus, moderate cumulus, few towering cumulus forming
in all quadrants  
Temperature: 82F, Dew point: 70F, Wind: NW at 8 kts,
Wind: direction variability W to N 
Sea-level pressure: 29.81 inches Hg, rising
Visibility: 15 miles, 20 miles WNW, hazy
BHO SA 1455 22 SCT E28 BKN 15 095/82/70/3108/981/ CU/MDTCU/FEW TCU
FRMG ALQDS HAZY VSBY WNW 20 HAZY ALQDS/ 8/201 51007
 
1 P.M.
Weather: Scattered cirrocumulus lenticularis, thin
scattered cirrus, cumulus, moderate cumulus and a
few towering cumulus SE-SW-N  
Temperature: 80F, Dew point: 69F, Wind: NNE at 11 kts,
Wind: direction variability N to E 
Sea-level pressure: 29.81 inches Hg, rising
Visibility: 25 miles, 15 miles NE-SE, 45 miles WNW, hazy
6-hourly max. temp: 84F
BHO SA 1755 220 SCT 250 SCT 300 –SCT 25 094/80/69/0311/981/
CU/MDT CU FEW TCU SE-SW-N CCSL VCTY STN VSBY WNW 45 NE-SE
HAZY ALQDS WND 35V08/ 8/209 55001 10084 20076 
 
WEATHER SUMMARY FOR MONDAY, AUGUST 10
 
TEMPERATURE (DEGREES F)
MAX.....87    NORMAL.....80
MIN.....66    NORMAL.....62
MEAN....77    NORMAL.....71
 
DEPARTURE FROM 30-YEAR AVERAGE..........+6
TOTAL DEPARTURE FOR THE MONTH...........+4  [0.2 DEGREES/DAY]
 
HEATING DEGREE DATA WILL RESUME IN SEPTEMBER
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............27 W   AT  1:44 P.M.  
                   AEROVANE..............25 W   AT  1:44 P.M.
                   ASOS..................26 W   AT  1:45 P.M.    
                   DAVIS.................26 W   AT  1:44 P.M. 
FASTEST MILE FOR YESTERDAY...............18 W   AT  1:47 P.M.  
MAXIMUM 2-MINUTE ASOS AVERAGE............20 W   AT  1:46 P.M.     
MAXIMUM 2-MINUTE DAVIS AVERAGE...........20 W   AT  1:46 P.M.  
AVERAGE WIND SPEED AND DIRECTION.......11.1 W
                   ASOS................10.9 
                   DAVIS...............10.7 WSW [240 DEG]
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.09   DEPARTURE....-0.04
                         ASOS..............0.09
TOTAL PRECIPITATION FOR THE MONTH..........0.12   DEPARTURE....-1.15
                         ASOS..............0.12
TOTAL PRECIPITATION FOR THE YEAR..........31.38   DEPARTURE....+0.70
                         ASOS.............32.50
 
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/+1/0/823/95    18 SSE
8/2  77/64/71/-1/T/104/12    25 SSE
8/3  84/67/76/+4/0/638/74    17 SW
8/4  83/66/75/+3/0/714/83    23 S
8/5  86/67/77/+5/T/378/44    27 SSW TSTM
8/6  76/61/69/-3/0/564/66    18 SSE
8/7  79/58/69/-2/0/836/98    32 W
8/8  74/55/65/-6/0/791/93    21 WNW
8/9  76/59/68/-3/T/178/21    25 SSE
8/10 87/66/77/+6/0.12/584/69 27 W  TSTM 
 
8/11 our overnight low temp: 72F; 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 11
HIGH 97F IN 1944
LOW 49F IN 1972
PRECIP 3.13 INCHES IN 1990
PEAK GUST 44 MPH SW IN 1971
 
RECORDS FOR AUGUST 12
HIGH 99F IN 1944
LOW 48F IN 1930
PRECIP 1.89 INCHES IN 1979
PEAK GUST 50 MPH NE IN 1983
 
TODAY'S REPORT PREPARED BY: Robert Skilling