BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JULY 31, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
NOT EXACTLY KITE FLYING WEATHER...
 
Winds were exceedingly low yesterday as our contact anemometer's 
average daily reading dipped to 4.4 MPH from the SSE. This was the 
third lowest 24-hour wind speed recorded since 1999. 
Winds remain very light today with an average of 5.1 MPH through 
2:15 p.m. EDT. Yesterday's Davis system had an average of 4.1 MPH.
 
YESTERDAY'S THREE SEPARATE RAINFALLS TOTALED 1.01 INCHES
 
The early morning thunderstorm featured a lot of lightning
which was both within cloud and cloud-to-ground between 6 
and 7 AM.  The storm also brought heavy rain and we recorded
just over a half inch of rain in an hour.  Just before noontime
more showers brought 0.24 inch and during the mid to late 
afternoon a thunderstorm brought an additional 0.21 inch. 
The daily total of 1.01 inches was the most in any single 
day since early June, or actually since 1.52 inches was 
recorded on June 4th.  That rainfall included some of the 
precipitation accompanying a tropical depression which had 
briefly been Tropical Storm Barry in the Gulf of Mexico 
just a few days earlier.
 
Today's observations:
 
7 A.M.   
Weather: Low overcast stratus with fog, sun visible 
Temperature: 69F, Dew point: 69F, Wind: NNW at 04 kts
Sea-level pressure: 29.96 inches Hg, rising
Visibility: 1/2 mile, fog, variability 1/4 to 3/8 mile
6-hour min temp: 67F     
24-hour rainfall: 0.45 inch 
BHO SA 1155 E3 OVC 1/2VF 144/69/69/3404/996/ OVC PTLY THN 
OVHD STRA DRFTG OVR SMT VSBY 1/4V3/8 N-NE ¼ ESE-SE 1 VSBY 
SLWLY INCRSNG SUN DMLY VSB/ 8/6// 51006 ASOS 70043 MANUAL 
70045 10069 20067     
 
10 A.M.   
Weather: Low stratus overcast with breaks  
Temperature: 75F, Dew point: 70F, Wind: NNW at 05 kts
Sea-level pressure: 29.96 inches Hg, steady
Visibility: 5 miles in thin fog and in haze  
BHO SA 1455 E9 OVC 5FH 145/75/70/3405/996/ BINOVC/ 8/6// 50001
 
1 P.M.   
Weather: Scattered cumulus, few towering vicinity station W   
Temperature: 79F, Dew point: 66F, Wind: NE at 11 kts  
Sea-level pressure: 29.94 inches Hg, falling
Visibility: 12 miles, hazy  
BHO SA 1755 30 SCT 12 140/79/66/0411/994/ FEW TCU DRK 
BASE VCNTY STN W CU/MDT CU XCPT OVHD-NNE-E WND 36V08 HAZY/
8/200 58005 10081 20069
 
WEATHER SUMMARY FOR MONDAY, JULY 30
 
TEMPERATURE (DEGREES F)
MAX.....79    NORMAL.....81 
MIN.....66    NORMAL.....63
MEAN....73    NORMAL.....72
DEPARTURE FROM 30-YEAR NORMAL........+1
TOTAL DEPARTURE FOR THE MONTH........+10  (0.1 DEGREES/DAY)
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............20  SW AT 5:29 A.M.  
                   AEROVANE...............16  SW AT 5:29 A.M.         
                   ASOS...................N/A  #
                   DAVIS..................20  SW AT 5:29 A.M.           
FASTEST MILE FOR YESTERDAY................12  SW AT 5:27 A.M.            
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............14  SW AT 5:30 A.M.             
AVERAGE WIND SPEED AND DIRECTION......... 4.4 SSE   
                   ASOS...................N/A  #
                   DAVIS................. 4.1 NE [37 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....0.45  DEPARTURE.....+0.33
                         ASOS..............0.43 
TOTAL PRECIPITATION FOR THE MONTH..........3.38  DEPARTURE.....-0.24 
                         ASOS..............2.26    
TOTAL PRECIPITATION FOR THE YEAR..........30.36  DEPARTURE.....+1.07
                   ASOS FOR YEAR..........29.67    
 
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/+6/0/845/96     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 79/66/73/+1/1.01/244/28  20 SW   TSTM
 
7/31 morning low temp. 66 deg; normal low now 63 deg.  
     
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 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
 
RECORDS FOR AUGUST 1
HIGH 97F IN 1917
LOW 49F IN 1891
PRECIP 3.61 INCHES IN 1927
PEAK GUST 41 MPH NNW IN 1985
 
TODAY'S REPORT PREPARED By: Robert Skilling and Eli Melaas