BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, NOVEMBER 26, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Broken stratocumulus, overcast altostratus, ground fog all quadrants Temperature: 45F, Dew point: 45F, Wind: WNW at 6 kt Sea-level pressure: 29.96 inches Hg, rising Visibility: 25 miles prevailing, 50 miles W-NW 6-hour minimum temp: 45F 24-hour precipitation: 0.08 inches BHO SA 1155 15 BKN 130 OVC 25 147/45/45/2906/996/ GF ALQDS VSBY W-NW 50 WND LGT/ 8/52/ 53007 70008 10046 20045 10 A.M. Weather: Overcast altostratus, disk of sun visible, ground fog lifting Temperature: 47F, Dew point: 46F, Wind: Light from WSW Sea-level pressure: 29.97 inches Hg, steady Visibility: 2 miles, fog BHO SA 1455 140 OVC 2F 149/47/46/2504/997/ GF LFTG SUN DMLY VSBL WND LGT/ 8/02/ 55002 1 P.M. Weather: Scattered stratocumulus, overcast altostratus Temperature: 50F, Dew point: 46F, Wind: Light and Variable Sea-level pressure: 29.90 inches Hg, falling Visibility: 20 miles, hazy 6 hour maximum temp: 50F BHO SA 1755 20 SCT 130 OVC 20 127/50/46/0804/990/ WND L/V HAZY/ 8/52/ 58022 10050 20044 WEATHER SUMMARY FOR WEDNESDAY, NOVEMBER 25 TEMPERATURE (DEGREES F) MAX.....47 NORMAL.....46 MIN.....43 NORMAL.....31 MEAN....45 NORMAL.....39 DEPARTURE FROM 30-YEAR AVERAGE.............+6 TOTAL DEPARTURE FOR THE MONTH............+121 [+4.6 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............20 DEPARTURE........-7 TOTAL HEATING UNITS FOR THE MONTH...........437 DEPARTURE......-123 TOTAL HEATING UNITS FOR THE SEASON.........1058 DEPARTURE.......-93 TOTAL HEATING UNITS LAST SEASON TO DATE....1110 DIFFERENCE......-52 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............21 N AT 12:43 A.M. AEROVANE..............21 N AT 12:58 A.M. ASOS..................21 N AT 12:43 A.M. DAVIS.................23 N AT 12:14 A.M. FASTEST MILE FOR YESTERDAY...............15 N AT 12:42 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE............14 N AT 12:44 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........14 N AT 5:49 A.M. AVERAGE WIND SPEED AND DIRECTION........6.8 N ASOS.................6.3 DAVIS................6.7 N [8 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.08 DEPARTURE....-0.07 ASOS..............0.07 TOTAL PRECIPITATION FOR THE MONTH..........3.20 DEPARTURE....-0.69 ASOS..............3.24 TOTAL PRECIPITATION FOR THE YEAR..........48.31 DEPARTURE....+2.40 ASOS.............49.55 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.....-2.2 TOTAL SNOWFALL FOR THE SEASON...............3.0 DEPARTURE.....+0.6 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 46/44/45/+6/0.11/000/00 33 NE Aero 30 MPH NE 11/25 47/43/45/+6/.../.../.. 21 N 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 26 HIGH 66 IN 1979 LOW 6 IN 1938 PRECIP 2.22 INS IN 1888 SNOWFALL 3.0 INS IN 1974 PEAK GUST 78 SSE IN 1964 RECORDS FOR NOVEMBER 27 HIGH 68 IN 1896 LOW 5 IN 1932 PRECIP 1.92 INS IN 1898 SNOWFALL 16.0 INS IN 1898 PEAK GUST 68 NW IN 1997 TODAY'S REPORT PREPARED BY: Andrew Hoell