BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, SEPTEMBER 12, 2008    
ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED 
 
TODAY IS ONLY 3RD CLOUDY DAY IN AN OTHERWISE
VERY SUNNY MONTH OF SEPTEMBER
 
There were just a few minutes of sunshine very early
today as clouds moved in ahead of approaching warmer
and increasingly moist air.  Only two days before
today have had a cloudy sky this month, a month which 
has had 75% of the possible bright sunshine to date. This
is well above the September long-term average of 56%.
 
Today's observations:
 
8 A.M. EDT
Weather:  Broken stratocumulus, overcast altocumulus,
small breaks in overcast
Temperature: 58F, Dew point: 52F,  Wind: S at 13 kts
Sea-level pressure: 30.24 inches Hg, falling
Visibility: 35 miles, 50 above inversion WNW, NE-SE 45  
6-hourly minimum temperature: 54F
24-hourly rainfall: 0.00 inch
BHO SA 1155 E55 BKN 75 OVC 35 239/58/52/1713/024/
FEW ACC HIER CLDS VSB SML BINOVC VSBY WNW 50 ABV
INVSN NE-SE 45 LGT HZ/ 8/58/ 56008 10058 20054
 
11 A.M. EDT
Weather: Overcast altostratus, few stratocumulus to the
ESE-S-SW  
Temperature: 62F, Dew point: 54F, Wind: S at 13 kts,
Sea-level pressure: 30.20 inches Hg, falling  
Visibility: 50 miles  
BHO SA 1455 E42 OVC 50 228/62/54/1713/020/
FEW SC DSNT ESE-S-SW/ 8/52/ 57011
 
2 P.M. EDT
Weather: Scattered stratocumulus, overcast altocumulus,
sun dimly visible
Temperature: 65F, Dew point: 55F, Wind: S at 16G23 kts,
Wind: Peak wind gust: S @ 27 kts, 9 past the hour
Sea-level pressure: 30.14 inches Hg, falling                                                                                                                                 
Visibility: 40 miles 
6-hour max. temp: 65F
BHO SA 1755 40 SCT E75 OVC 40 206/65/55/1716G23/014/
SUN DMLY VSB LGT HZ PK WND 1727/09/ 8/57/ 58022 10065 20058
 
WEATHER SUMMARY FOR THURSDAY, SEPTEMBER 11
 
TEMPERATURE (DEGREES F)
MAX.....69    NORMAL.....73
MIN.....48    NORMAL.....55
MEAN....59    NORMAL.....64
 
DEPARTURE FROM 30-YEAR NORMAL............- 5
TOTAL DEPARTURE FOR THE MONTH............+35 (+3.0 PER DAY)
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY............20 S   AT 10:53 P.M.       
                   AEROVANE.............18 S   AT 10:53 P.M. *                 
                   ASOS.................22 S   AT 10:53 P.M.         
                   DAVIS................21 SSW AT 10:53 P.M.        
FASTEST MILE FOR YESTERDAY............. 15 S   AT 10:55 P.M. *
MAXIMUM 2-MINUTE ASOS AVERAGE...........15 S   AT 11:59 P.M.         
MAXIMUM 2-MINUTE DAVIS AVERAGE..........15 S   AT 10:53 P.M.        
                   AVERAGE............ 7.0 E 
                   ASOS................7.2   
                   DAVIS.............. 6.5 ENE [060 deg]
 
* last of several occurrences
 
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  SEPT..............2.51   DEPARTURE.......+1.04
                         ASOS..............2.52  
TOTAL PRECIPITATION FOR THE YEAR..........37.97   DEPARTURE.......+3.03 
                         ASOS.............40.52 #
#  Includes erroneous ASOS precipitation data on 2/13/08.
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2008 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane recording wind system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
9/1  81/57/69/+2/0.00/787/100    29 NW
9/2  74/60/67/+1/0.00/604/77     27 N 
9/3  75/57/66/0/0.00/766/98      22 N    Aero 20 MPH SSE
9/4  85/62/74/+8/0.00/748/96     23 SSW
9/5  86/67/77/+12/0.00/575/74    32 SSE
9/6  82/68/75/+10/1.88/039/05    44 SE   Aero 39 MPH SE *
9/7  78/61/70/+5/0.31/655/85     43 NW   Aero 43 MPH NW *
9/8  78/58/68/+3/0.00/753/98     23 WSW
9/9  73/60/67/+3/0.32/054/07     43 SW   Aero 46 MPH SW TSTM #
9/10 68/52/60/-4/0.00/748/98     25 WNW   
9/11 69/48/59/-5/0.00/616/81     23 S
 
9/12 morning low temp. 54F; our normal low is now 54F
 
* Tropical Storm Hanna
# Thunderstorm gust 
 
NEW DAILY RECORDS FOR SEPTEMBER
 
None to date..
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 12
HIGH 92F IN 1961
LOW 42F IN 1958,1967,1985
PRECIP 2.79 INCHES IN 1960 (HURRICANE DONNA)
PEAK GUST 140 MPH SSE IN 1960 (HURRICANE DONNA)
 
RECORDS FOR SEPTEMBER 13
HIGH 91F IN 1957
LOW 40F IN 1985
PRECIP 3.10 INCHES IN 1987
PEAK GUST 44 MPH WNW IN 1986

TODAY'S REPORT PREPARED By: Robert Skilling