BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, AUGUST 28, 2007   
ALL TIMES ARE IN EASTERN STANDARD TIME
 
EARLY MORNING INVERSION BRINGS 15-DEGREE TEMP. DIFFERENCE 
SUMMER PRECIPITATION TOTAL NEAR 5 INCHES BELOW NORMAL 
EFFECTS OF DRY WEATHER SEEN IN YELLOWING OF LEAVES
 
The low temperature at the summit this morning was 64 degrees 
while the minimum at Norwood Airport was 49 degrees, a 15-degree
difference, a phenomonen often observed when a large high pressure
system with dry air is centered over New England. 
  
The summer precipitation total is now 6.82 inches or close to 
five inches below the average for the three months of June, July
and August.  This total represents only 58% of normal but if the
rainfall which fell very early in June is discounted we have just
45% of average, June 6-August 27.  
 
The effects of the especially dry weather this month with less 
than 20% of normal August rainfall is causing many yellow leaves
to develop on trees around the summit and in general around this
area.  
 
Our August rainfall continues at only 0.62 inch, far below 
the normal of 4.06 inches.  The month could slide into 
second place in the ranking of driest Augusts. 
Driest Augusts (inches)
 
1) 0.53 in 1981
2) 0.91 in 1984
3) 1.05 in 1910
 
Today's observations:
 
7 A.M.   
Weather: Clear, few altocumulus, few cirrus W-N  
Temperature: 69F, Dew point: 59F, Wind: NNW at 07 kts
Sea-level pressure: 30.22 inches Hg, rising
Visibility: 25 miles, hazy, 35 above inversion WNW  
6-hour min temp: 64F
24-hour rainfall: 0.00 
BHO SA 1155 CLR 25 232/69/59/3307/022/ FEW AC ALQDS 
LINE OF ACC XTDNG E-SSE FEW CI W-N INVSN DSSPTNG 
THN K LYR ALG HRZN N-NE VSBY WNW 35 ABV INVSN HAZY ALQDS/ 
8/081 52010 10069 20064
  
10 A.M.   
Weather: Clear, cumulus forming WSW-NNW, few cirrus 
Temperature: 78F, Dew point: 56F, Wind: NNE at 07 kts
Wind: variability NNW-E
Sea-level pressure: 30.21 inches Hg, steady
Visibility: 35 miles, NW-N 25 miles, smoke layer   
BHO SA 1450 CLR 35 230/78/56/0307/021/ CU FRMG WSW-NNW 
FEW MDT TOPS FEW CI K LYR SFC/ALF NW-N AND THN K LYR 
ALG HRZN N-NNE VSBY NW-N 25 WND 34V08/ 8/201 58002
 
1 P.M.   
Weather: Scattered cumulus and cirrus clouds  
Temperature: 82F, Dew point: 52F, Wind: NNE at 09 kts 
Wind: variability NNW-ENE 
Sea-level pressure: 30.17 inches Hg, falling 
Visibility: 50 miles    
6-hour max. temp: 83 deg. F
BHO SA 1750 60 SCT 220 SCT 50 218/82/52/0209/017/
CU/SC SE-SW-N MSTLY CLR SKY OVHD-N-E WND 33V06/ 
8/401 56012 10083 20069 
 
WEATHER SUMMARY FOR MONDAY, AUGUST 27
 
TEMPERATURE (DEGREES F)
MAX.....79    NORMAL.....77 
MIN.....64    NORMAL.....59
MEAN....72    NORMAL.....68
DEPARTURE FROM 30-YEAR NORMAL........ +4
TOTAL DEPARTURE FOR THE MONTH........+28  (+0.8 DEGREES/DAY)
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............25 NNE AT 8:08 A.M. *   
                   AEROVANE...............23 NNE AT 8:08 A.M.   
                   ASOS...................N/A  #
                   DAVIS..................24 NE  AT 8:04 A.M. 
FASTEST MILE FOR YESTERDAY................17 NNE AT 8:06 A.M.     
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............17 NE  AT 8:09 A.M. 
AVERAGE WIND SPEED AND DIRECTION..........9.6 NE 
                   ASOS...................N/A  #
                   DAVIS..................9.8 NE [040 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.....-0.14
                         ASOS..............0.00 
TOTAL PRECIPITATION FOR THE MONTH..........0.62  DEPARTURE.....-2.88  
                         ASOS..............0.55    
TOTAL PRECIPITATION FOR THE YEAR..........30.98  DEPARTURE.....-1.93
                         ASOS.............30.22    
 
 
PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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
 
8/1  84/67/76/+4/0/851/98     20 NNE    
8/2  92/68/80/+8/0/823/95     21 S     
8/3  92/70/81/+9/0/760/88     28 SSW
8/4  89/71/80/+8/0/827/96     29 WSW  
8/5  80/62/71/-1/0/842/98     23 SSE 
8/6  77/61/69/-3/0.05/129/15  36 SSE  Aero 34 MPH SSE TSTM  
8/7  82/67/75/+4/0.12/410/48  15 SSE 
8/8  88/70/79/+8/0.10/349/41  36 S
8/9  75/60/68/-3/0/722/85     32 NW
8/10 63/53/58/-13/0.19/017/02 16 SSW
8/11 83/52/68/-3/0/743/88     21 WNW
8/12 86/64/75/+4/0/665/79     21 SSW
8/13 83/64/74/+3/0.01/260/31  30 NW   TSTM 
8/14 78/58/68/-2/0/812/97     23 NW
8/15 83/59/71/+1/0/651/78     36 SSW  Aero 34 MPH SSW
8/16 87/67/77/+7/0/641/77     33 SSW
8/17 78/62/70/0/0.07/241/29   43 S    Aero 39 MPH S TSTM  
8/18 71/52/62/-8/0.08/761/92  46 WNW  Aero 42 MPH WNW, Davis 46 MPH WNW TSTM  
8/19 74/51/63/-7/0/619/75     25 WNW  
8/20 70/56/63/-6/0/411/50     21 ENE
8/21 68/56/62/-7/0/271/33     23 E  
8/22 70/55/63/-6/0/147/18     23 NE    
8/23 75/59/67/-2/T/024/03     22 SSE   
8/24 88/66/77/+8/0/552/68     30 SSW  
8/25 93/69/81/+13/0/566/70    25 SSE  
8/26 84/68/76/+8/T/169/21     22 S
8/27 79/64/72/+4/0/.../..     25 NNE
 
8/28 morning low temp. 64F; normal low now 59F
 

NEW DAILY RECORDS FOR AUGUST 2007: 
 
8/18 - NEW RECORD PEAK GUST FOR OF 46 MPH WNW; 
the previous record was 39 MPH SW in 1991
8/25 - RECORD HIGH TEMPERATURE OF 93F;
ties previous record set in 1947,1948
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR AUGUST 28
HIGH 95F IN 1948
LOW 43F IN 1885
PRECIP 1.80 INCHES IN 1922
PEAK GUST 87 MPH SSE 1971
 
RECORDS FOR AUGUST 29
HIGH 95F IN 1953
LOW 41F IN 1982
PRECIP 2.88 INCHES IN 1962
PEAK GUST 70e MPH S 1949
 
TODAY'S REPORT PREPARED By: Robert Skilling