BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, AUGUST 21, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
Today's observations:
 
7 A.M.  
Weather: Overcast stratus, thin fog
Temperature: 72F, Dew point: 66F, Wind: NE at 9 kts
Sea-level pressure: 30.00 inches Hg, rising
Visibility: 10 miles, hazy
6-hour minimum temp: 70F
BHO SA 1155 E4 OVC 3F 149/76/75/1710/997/
LB20E21 PCPN VRY LGT THN FG WND 12V20/
8/6// 51003 MANUAL 6000/ MANUAL 70034 ASOS 70035 10076 20070
 
10 A.M.
Weather: Broken stratus, overcast cirrus
Temperature: 82F, Dew point: 76F, Wind: SSE at 12 kts
Wind: Direction variable ESE to SSW
Sea-level pressure:  29.97 inches Hg, steady
Visibility: 6 miles, hazy
BHO SA 1455 E40 BKN 250 OVC 6H 149/82/76/1612/997/
FEW LWR STRA HAZY WND 12V21/ 8/601 50000
 
1 P.M.
Weather: Scattered stratocumulus, thin broken cirrus
Temperature: 87F, Dew point: 75F, Wind: SSE at 13G26 kts,
Wind: Peak gust past hour 26 kts SSE at 12:52 P.M.
Sea-level pressure: 29.91 inches Hg, falling
Visibility: 12 miles, hazy
6-hourly max. temp: 87F
BHO SA 1755 30 SCT 250 –BKN 12 130/87/75/1613G26/991/
PK WND 1626/52 HAZY/ 8/501 58019 10087 20076
 
WEATHER SUMMARY FOR THURSDAY, AUGUST 20
 
TEMPERATURE (DEGREES F)
MAX.....83    NORMAL.....78
MIN.....70    NORMAL.....61
MEAN....77    NORMAL.....69
 
DEPARTURE FROM 30-YEAR AVERAGE...........+8
TOTAL DEPARTURE FOR THE MONTH...........+51 [+2.4 DEGREES/DAY]
 
HEATING DEGREE DATA WILL RESUME IN SEPTEMBER
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............21 SSE AT  5:41 P.M. *
                   AEROVANE..............19 SSE AT 10:40 P.M. *
                   ASOS..................20 S   AT  5:42 P.M.        
                   DAVIS.................19 S   AT 10:21 P.M.
FASTEST MILE FOR YESTERDAY...............15 SSE AT 10:41 P.M. 
MAXIMUM 2-MINUTE ASOS AVERAGE............15 S   AT  6:39 P.M.         
MAXIMUM 2-MINUTE DAVIS AVERAGE...........14 SSE AT  6:39 P.M.
AVERAGE WIND SPEED AND DIRECTION........8.0 SSE
                   ASOS.................8.1
                   DAVIS................7.6 SSE  [162 DEG]
* last of several occurrences
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.34   DEPARTURE....+0.21
                         ASOS..............0.35
TOTAL PRECIPITATION FOR THE MONTH..........1.18   DEPARTURE....-1.39
                         ASOS..............1.19
TOTAL PRECIPITATION FOR THE YEAR..........32.44   DEPARTURE....+0.46
                         ASOS.............33.57
 
PRELIMINARY CLIMATE SUMMARY FOR AUGUST 2009 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST
AERO: Aerovane wind recording system gust when significant
TSTM: Thunderstorm day (thunder heard some time during day)
....: Data not yet available, records not finalized
 
8/1  83/63/73/+1/0/823/95    18 SSE
8/2  77/64/71/-1/T/104/12    25 SSE
8/3  84/67/76/+4/0/638/74    17 SW
8/4  83/66/75/+3/0/714/83    23 S
8/5  86/67/77/+5/T/378/44    27 SSW  TSTM
8/6  76/61/69/-3/0/564/66    18 SSE
8/7  79/58/69/-2/0/836/98    32 W
8/8  74/55/65/-6/0/791/93    21 WNW
8/9  76/59/68/-3/T/178/21    25 SSE 
8/10 87/66/77/+6/0.12/584/69 27 W    TSTM 
8/11 84/66/75/+4/0.54/684/81 25 NE   TSTM 
8/12 67/63/65/-6/T/000/00    18 N
8/13 66/60/63/-8/0.18/042/05 23 NNE
8/14 83/58/71/+1/0/762/91    16 S
8/15 88/66/77/+7/0/810/97    18 S
8/16 90/68/79/+9/0/749/90    22 S
8/17 91/69/80/+10/0/.../..   21 WSW
8/18 91/72/82/+12/0/.../..   29 SSW
8/19 89/71/80/+10/0/.../..   23 SW
8/20 83/70/77/+8/0.34/.../.. 21 SSE  TSTM
 
8/21 our morning low temp: 72F; the normal low is now 60F
 
NEW DAILY RECORDS FOR AUGUST 2009 TO DATE...
 
8/19: RECORD HIGH MINIMUM TEMPERATURE 71F;
      equals record previously set in 2002
 
DAILY EXTREMES
 
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR AUGUST 21
HIGH 92F IN 1937, 1995
LOW 47F IN 1982
PRECIP 2.84 INCHES IN 1888
PEAK GUST 54 MPH WSW 2004
 
RECORDS FOR AUGUST 22
HIGH 90F IN 1939
LOW 42F IN 1894
PRECIP 2.28 INCHES IN 1935
PEAK GUST 44 MPH SSW 1987
 
TODAY'S REPORT PREPARED BY: Stephanie Radner