BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
  
DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, SEPTEMBER 19, 2007    
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.   
Weather: Broken stratocumulus, thin fog, patches 
ground fog, steam fog over ponds SE 
Temperature: 51F, Dew point: 48F, Wind: N at 6 kts 
Sea-level pressure: 30.36 inches Hg, rising
Visibility: 12 miles, 20 miles W-NW    
6-hour min temp: 48F
24-hour rainfall: 0.00 in 
BHO SA 1155 E15 BKN 12 281/51/48/3506/036/ THN F 
FEW PTCHS GF ALQDS PTCHS STEAM FG OVR PNDS SE 
DRK K LYR ALG HRZN SW-NW VSBY W-NW 20/ 8/500 51005 
10051 20048 
  
10 A.M.   
Weather: Overcast stratocumulus with breaks WSW-NNW  
Temperature: 58F, Dew point: 53F, Wind: W at 2 kts 
Wind: light and variable
Sea-level pressure: 30.35 inches Hg, falling
Visibility: 25 miles, 55 miles W-NW, light haze  
BHO SA 1455 E10 OVC 25 277/58/53/E2602/035/ BINOVC WSW-NNW 
LGT HZ VSBY W-NW 55 WND LGT AND VRB/ 8/5// 58004
 
1 P.M.   
Weather: Scattered cumulus/stratocumulus, thin broken cirrus
Temperature: 67F, Dew point: 51F, Wind: SE at 4 kts  
Wind: light and variable
Sea-level pressure: 30.30 inches Hg, falling
Visibility: 60 miles  
6-hour max. temp: 67F  
6-hour precip: 0.00 in. 
BHO SA 1755 15 SCT 250 –BKN 60 261/67/51/1304/030/ 
K LYR NW-N WND LGT AND VRB/ 8/501 58016 10067 20051
 
WEATHER SUMMARY FOR TUESDAY, SEPTEMBER 18
 
TEMPERATURE (DEGREES F)
MAX.....64    NORMAL.....71 
MIN.....46    NORMAL.....53
MEAN....55    NORMAL.....61
DEPARTURE FROM 30-YEAR NORMAL.........-6 
TOTAL DEPARTURE FOR THE MONTH........+11  [+0.4 DEGREES/DAY]
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY..............22 NE  AT  1:24 P.M. * 
                   AEROVANE...............16 NE  AT 11:43 A.M.  
                   ASOS...................N/A  #
                   DAVIS..................20 NE  AT 11:07 A.M. 
FASTEST MILE FOR YESTERDAY................14 ENE AT  3:34 P.M. *     
MAXIMUM 2-MINUTE ASOS AVERAGE.............N/A  # 
MAXIMUM 2-MINUTE DAVIS AVERAGE............15 ENE AT 3:01 P.M.  
AVERAGE WIND SPEED AND DIRECTION..........9.5  NE  
                   ASOS...................N/A  #
                   DAVIS..................9.4 NNE [027 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..........1.86  DEPARTURE.....-0.59  
                         ASOS..............1.88    
TOTAL PRECIPITATION FOR THE YEAR..........32.85  DEPARTURE.....-3.07
                         ASOS.............32.11    
 
PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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
 
9/1  79/57/68/+1/0/790/100    25 WNW   
9/2  78/51/65/-1/0/787/100    22 S   
9/3  85/57/71/+5/0/760/97     31 SSW AERO 28 MPH SSW 
9/4  76/61/69/+3/0/641/82     28 NW  AERO 26 MPH NW
9/5  74/53/64/-1/0/732/94     21 ESE 
9/6  76/55/66/+1/0/380/49     31 S
9/7  92/62/77/+12/0/680/88    30 SSW
9/8  93/67/80/+15/0/686/89    31 S    TSTM 
9/9  72/57/65/+1/0.16/000/00  28 NNE  TSTM 
9/10 66/57/62/-2/0.03/000/00  18 NNE
9/11 68/58/63/-1/1.34/000/00  30 WNW  
9/12 73/55/64/+1/0/752/99     35 W    Aero 33 MPH W
9/13 73/52/63/0/0/741/98      23 ESE  
9/14 76/56/66/+3/0/587/78     26 SSE
9/15 63/49/56/-6/0.33/225/30  36 WNW  
9/16 65/45/55/-7/0/606/81     20 WNW  
9/17 63/46/55/-7/0/738/99     20 NE  
9/18 64/46/55/-6/0/.../..     22 NE   Aero 16 MPH NE
 
9/19 morning low temp. 48F; the normal low is now 52F 
 
NEW DAILY RECORDS FOR SEPTEMBER 2007: 
 
9/7 - RECORD HIGH TEMPERATURE 92; PREVIOUS 91 IN 1945.
9/8 - RECORD HIGH TEMPERATURE 93; PREVIOUS 91 IN 1945.
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR SEPTEMBER 19
HIGH 87F IN 1906,1983
LOW 37F IN 1929
PRECIP 3.69 INCHES IN 1936
PEAK GUST 48 MPH NE IN 1972
 
RECORDS FOR SEPTEMBER 20
HIGH 90 IN 1983
LOW 34 IN 1979
PRE 4.57 INS IN 1899
WIND 44 MPH NE IN 1972
 
TODAY'S REPORT PREPARED By: Stephanie Radner