BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS 02186
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
 
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, NOVEMBER 24, 2009
ALL TIMES ARE IN EASTERN STANDARD TIME
 
FOG AND LOW CLOUDS TODAY 
LIGHT AMOUNT OF PRECIPITATION RECORDED
COLD AND GUSTY NORTHERLY WINDS
 
A layer of very low stratus clouds covered
the summit this morning with our visibility
down to 1/16 mile until early afternoon. The
low clouds began lifting early this afternoon
after some very light drizzle ended by late
this morning. A total of just over one quarter
of an inch of rain and drizzle fell starting
Monday afternoon lasting into this morning.    
Gusty northerly winds to 25 to 30 MPH early today
were gradually backing to north-northwest and
diminishing early this afternoon.
 
Today's observations:
 
7 A.M.
Weather: Obscurement with heavy fog 
Temperature: 45F, Dew point: 45F, Wind: N at 13G21 kts,
Wind: Direction variable NNW to NE
Sea-level pressure: 30.25 inches Hg, falling
Visibility: 1/16 mile, heavy fog 
6-hour minimum temp: 45F
6-hour precipitation: 0.03 in.
24-hour precipitation: 0.28 in.
BHO SA 1155 W2 X 1/16F 243/45/45/0112G21/025/
WND 33V04/ 8//// 56011 ASOS 60003 MANUAL 6003/ AS0S 70028
MANUAL 70028 10046 20045 
 
10 A.M.
Weather: Obscurement with heavy fog, very light drizzle 
Temperature: 45F, Dew point: 45F, Wind: N at 14G23 kts,
Wind: Direction variable NNW-NNE
Sea-level pressure: 30.25 inches Hg, falling
Visibility: 1/16 mile, fog, very light drizzle
3-hourly precip: trace 
BHO SA 1455 W1 X 1/16L-F 242/45/45/3614G23/025/
WND 33V03 PCPN VRY LGT/ 8//// 58001 MANUAL 6000/
 
1 P.M.  
Weather: Low overcast, few stratus fractus drifting over 
summit, thin fog  
Temperature: 44F, Dew point: 44F, Wind: N at 11 kts,
Wind: Direction variable NW-NNE, gust to 24 knots past hour
Sea-level pressure: 30.19 inches Hg, falling
Visibility: 3 miles and increasing, thin fog  
6-hour max. temp: 45F
6-hour precip: trace
BHO SA 1755 E3 OVC 3F 223/44/44/3511/019/ VSBY INCRSNG
GST 24 KTS PST HR WND 32V02/ 8/6// 56019 MANUAL 6000/
10045 20044
 
WEATHER SUMMARY FOR MONDAY, NOVEMBER 23
 
TEMPERATURE (DEGREES F)
MAX.....47     NORMAL.....46
MIN.....42     NORMAL.....32
MEAN....45     NORMAL.....39
 
DEPARTURE FROM 30-YEAR AVERAGE.............+6
TOTAL DEPARTURE FOR THE MONTH............+109 [+4.5 DEGREES/DAY]
 
HEATING DEGREE DAYS
TOTAL HEATING UNITS FOR YESTERDAY............20    DEPARTURE........-6
TOTAL HEATING UNITS FOR THE MONTH...........397    DEPARTURE......-110
TOTAL HEATING UNITS FOR THE SEASON.........1018    DEPARTURE.......-80
TOTAL HEATING UNITS LAST SEASON TO DATE....1056    DIFFERENCE......-38
 
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY.............33 NE   AT  10:40 P.M. *
                   AEROVANE..............31 ENE  AT  11:54 A.M. 
                   ASOS..................33 ENE  AT  11:55 A.M. 
                   DAVIS.................33 ENE  AT  11:54 A.M.  
FASTEST MILE FOR YESTERDAY...............23 NE   AT  11:58 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE............22 NNE  AT   7:44 P.M.        
MAXIMUM 2-MINUTE DAVIS AVERAGE...........23 NE   AT  11:58 A.M.        
AVERAGE WIND SPEED AND DIRECTION.......14.8 NE
                   ASOS................14.1
                   DAVIS...............14.3 NE [040 DEG]
* Last of several occurrences. 
 
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.28   DEPARTURE....+0.13
                         ASOS..............0.28
TOTAL PRECIPITATION FOR THE MONTH..........3.05   DEPARTURE....-0.54
                         ASOS..............3.12
TOTAL PRECIPITATION FOR THE YEAR..........48.16   DEPARTURE....+2.55
                         ASOS.............49.43
                 
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0  DEPARTURE.....-0.1
TOTAL SNOWFALL FOR THE MONTH................0.0  DEPARTURE.....-2.0
TOTAL SNOWFALL FOR THE SEASON...............3.0  DEPARTURE.....+0.8
                                               
PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 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
 
11/1  58/44/51/+4/0.05/167/27   22 WNW  
11/2  49/42/46/0/T/099/16       29 NE
11/3  57/36/47/+1/0/474/77      32 W    AERO 32 MPH W    
11/4  49/34/42/-4/0/514/84      24 W
11/5  46/36/41/-4/0.01/006/01   21 N
11/6  47/31/39/-6/0/419/69      38 WNW  AERO 38 MPH WNW
11/7  49/29/39/-6/0/575/95      33 S
11/8  66/42/54/+10/0/549/91     31 SSW
11/9  68/49/59/+15/0/486/81     35 S    AERO 35 MPH S
11/10 62/50/56/+12/0/000/00     23 SW 
11/11 50/43/47/+4/0/113/19      31 NNE
11/12 49/41/45/+2/0/125/21      34 NE   AERO 31 MPH NNE
11/13 49/44/47/+4/0/000/00      39 NNE  AERO 37 MPH NNE
11/14 59/49/54/+12/2.08/000/00  39 NE   AERO 38 MPH NE
11/15 60/52/56/+14/0.06/012/02  18 W
11/16 56/43/50/+8/0/527/90      30 NW   AERO 31 MPH NW
11/17 47/35/41/0/0/576/99       28 WNW
11/18 49/34/42/+1/0/313/54      15 SSW
11/19 59/41/50/+9/0/226/39      30 SE
11/20 65/44/55/+15/0.57/219/38  40 W    AERO 41 MPH W
11/21 55/41/48/+8/0/373/65      25 SW 
11/22 49/38/44/+4/0/292/51      28 ENE 
11/23 47/42/45/+6/0.22/000/00   33 NE   AERO 31 MPH ENE
 
11/24 our morning low temp: 45F; the normal low is 32F 
 
NEW DAILY RECORD FOR NOVEMBER 2009
11/14: NEW RECORD DAILY RAINFALL 2.08 INCHES;
      surpasses previous 1.87 inches in 1972.  
 
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
 
RECORDS FOR NOVEMBER 24
HIGH 69 IN 1931
LOW 7 IN 1897
PRECIP 1.76 INCHES IN 1901
SNOWFALL 4.5 INS IN 1936
PEAK GUST 69 SSW IN 1959
 
RECORDS FOR NOVEMBER 25
HIGH 71 IN 1979
LOW 13 IN 1938
PRECIP 3.10 INCHES IN 1983
SNOWFALL 8.0 INS IN 1888
PEAK GUST 94e E IN 1950
 
TODAY'S REPORT PREPARED BY: Robert Skilling