BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, JULY 30, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
A DOWNPOUR ACCOMPANYING AN EARLY MORNING THUNDERSTORM
BROUGHT A HALF INCH OF RAIN BETWEEN 6 AND 7 AM EDT
 
A second downpour in as many days brought another half inch 
of rainfall early this morning.  Frequent lightning was 
observed and thunder accompanied the rainfall but the peak
wind gust was only 21 MPH SW at 6:29 a.m EDT
 
More showers were beginning here early this afternoon and 
the rain was coming as heavy rain showers by 1 p.m. 
About 0.14 inch of rain had fallen in the hour ending at 1 p.m.
 
Today's observations:
 
7 A.M.   
Weather: Overcast, thunderstorm, very light rain,
thunderstorm northeast moving northeast,
frequent lightning and heavy rain past hour  
Temperature: 66F, Dew point: 66F, Wind: W at 02 kts
Sea-level pressure: 29.91 inches Hg, rising
Visibility: 8 miles, rain and thin fog, S-SW 10 miles  
6-hour min temp: 66F     
24-hour rainfall: 0.56 in. 
BHO SA 1155 30 SCT E70 BKN 95 OVC 8TR- 152/66/66/E2702/998/
T NE MOVG ENE OCNL LTGIC NE CB N-E MOVG ENE AC CHAOTIC OVHD-S-SW 
SML BINOVC DSNT WSW PTCHS STFRA DRFTG BLO SMT VSBY S-SW 10 PCPN VRY LGT/ 
8/99/ 50008 ASOS 60056 MANUAL 6056/ ASOS 70056 MANUAL 70056 10071 20066 
  
10 A.M.   
Weather: Scattered clouds, moderate cumulus forming  
Temperature: 76F, Dew point: 68F, Wind: WSW at 04 kts
Wind: Light
Sea-level pressure: 29.98 inches Hg, rising
Visibility: 15 miles, hazy   
BHO SA 1455 30 SCT 130 SCT 15 154/76/68/2404/998/
MDT CU FRMG FEW ACC HAZY WND LGT/ 8/280 53002 6000/ 
 
WEATHER SUMMARY FOR SUNDAY, JULY 29
 
TEMPERATURE (DEGREES F)
MAX.....83    NORMAL.....82 
MIN.....69    NORMAL.....63
MEAN....76    NORMAL.....72
DEPARTURE FROM 30-YEAR NORMAL........+4
TOTAL DEPARTURE FOR THE MONTH........+9  (0.1 DEGREES/DAY)
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............24  E AT 12:52 P.M.  
                   AEROVANE...............21  E AT 12:52 P.M.         
                   ASOS...................N/A  #
                   DAVIS..................22  E AT 12:49 P.M.           
FASTEST MILE FOR YESTERDAY................17  E AT 12:54 P.M.            
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............18  E  AT 12:50 P.M.             
AVERAGE WIND SPEED AND DIRECTION......... 5.8 S   
                   ASOS...................N/A  #
                   DAVIS................. 6.4 S [180 deg] 
 
# 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....0.56  DEPARTURE.....+0.44
                         ASOS..............0.56 
TOTAL PRECIPITATION FOR THE MONTH..........2.93  DEPARTURE.....-0.57 
                         ASOS..............2.83    
TOTAL PRECIPITATION FOR THE YEAR..........29.91  DEPARTURE.....+0.74
                   ASOS FOR YEAR..........29.24    
 
PRELIMINARY CLIMATE SUMMARY FOR JULY 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
 
7/1  70/52/61/-9/0.02/649/71/ 28 W      
7/2  73/50/62/-8/0/841/92/    29 WNW 
7/3  75/53/64/-6/0/839/92/    23 NW 
7/4  78/58/68/-2/0.09/465/51/ 45 SSE 
7/5  80/61/71/ 0/0.25/383/42/ 38 SSE TSTM   
7/6  83/62/73/+2/0.01/482/53/ 46 WNW TSTM  
7/7  81/60/71/0/0/509/56/     32 WSW   
7/8  90/62/76/+5/0.41/563/62/ 36 NW Aero 33 MPH TSTM 
7/9  86/61/74/+3/0.20/354/39  27 NNE TSTM
7/10 80/62/71/0/0/680/75      27 S 
7/11 84/70/77/+5/T/371/41     32 S
7/12 81/64/73/+1/0.01/813/90  27 WNW
7/13 84/62/73/+1/0/695/77     36 WSW
7/14 82/62/72/0/T/765/85      33 SSE
7/15 87/65/76/+4/T/638/71     44 S  Aero 45 MPH S, Davis 48 MPH S     
7/16 84/65/75/+3/0/449/50     18 WNW 
7/17 85/65/75/+3/0/591/66     18 WNW
7/18 71/66/69/-3/0.21/000/00  23 SE   
7/19 83/65/74/+2/0.20/205/23  31 S   
7/20 82/61/72/0/0/330/37      29 WSW
7/21 77/58/68/-4/0/436/49     23 WNW 
7/22 77/61/69/-3/0/826/93     24 ENE   
7/23 64/60/62/-10/0.07/000/00 32 NNE
7/24 82/62/72/-1/0/796/90     25 SW
7/25 88/63/76/+3/0/864/98     21 WSW   
7/26 91/65/78/+6/0/.../..     21 S
7/27 90/69/80/+8/0/.../..     29 S
7/28 87/69/78/+6/0.90/.../..  24 WNW  TSTM  
7/29 83/69/76/+4/0/428/49     24 E
 
7/30 morning low temp. 66 deg; normal low now 63 deg.  
     early morning thunderstorm, 0.56 rainfall  
  
NEW DAILY RECORDS FOR JULY 2007: 
 
None to date
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR JULY 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INCHES IN 1976
PEAK GUST 70e MPH SW 1944
 
RECORDS FOR JULY 31
HIGH 95F IN 1917
LOW 50F IN 1895,1918
PRECIP 1.34 INCHES IN 1892
PEAK GUST 43e MPH WNW IN 1953, 43 SW IN 1971
 
TODAY'S REPORT PREPARED By: Robert Skilling