BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, NOVEMBER 19, 2009 ALL DATA IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Clear, few stratocumulus SE to SW Temperature: 44F, Dew point: 38F, Wind: W at 7 kts Sea-level pressure: 30.41 inches Hg, steady Visibility: 12 miles, thin fog 6-hour minimum temp: 41F 24-hour precipitation: 0.00 BHO SA 1155 CLR 12 299/44/38/2707/041/ FEW SC SE-SW THN FG BLO INVSN PTCHS GF PTCHS STEAM FG OVR PONDS SE INVSN PRSNT/ 8/500 53000 10044 20041 10 A.M. Weather: Broken stratocumulus, broken cirrus Temperature: 53F, Dew point: 42F, Wind: S at 2 kts(estimated) Wind: Light Sea-level pressure: 30.42 inches Hg, falling Visibility: 15 miles, light haze BHO SA 1455 E32 BKN 250 BKN 15 300/53/42/E1702/042/ DRK K LYR N-NE LGT HZ WND LGT/ 8/501 58001 1 P.M. Weather: Broken stratocumulus Temperature: 59F, Dew point: 49F, Wind: SSE at 7 kts Sea-level pressure: 30.36 inches Hg, falling Visibility: 20 miles light haze 6-hour max. temp: 59F BHO SA 1755 E30 BKN 20 282/59/49/1507/036/ LGT HZ/ 8/500 56018 10059 20044 WEATHER SUMMARY FOR WEDNESDAY, NOVEMBER 18 TEMPERATURE (DEGREES F) MAX.....49 NORMAL.....48 MIN.....34 NORMAL.....34 MEAN....42 NORMAL.....41 DEPARTURE FROM 30-YEAR AVERAGE.............+1 TOTAL DEPARTURE FOR THE MONTH.............+67 [+3.5 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............23 DEPARTURE........-1 TOTAL HEATING UNITS FOR THE MONTH...........314 DEPARTURE.......-68 TOTAL HEATING UNITS FOR THE SEASON..........935 DEPARTURE.......-38 TOTAL HEATING UNITS LAST SEASON TO DATE.....854 DIFFERENCE......+81 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............15 SSW AT 11:09 P.M. * AEROVANE..............14 SSW AT 11:04 P.M. * ASOS..................13 SW AT 11:56 P.M. DAVIS.................14 SSW AT 11:07 P.M. FASTEST MILE FOR YESTERDAY...............11 SSW AT 11:12 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............12 SW AT 11:20 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........12 SSW AT 11:15 P.M. AVERAGE WIND SPEED AND DIRECTION........5.2 SSW ASOS.................5.6 DAVIS................5.3 SW [233 DEG] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE....-0.16 ASOS..............0.00 TOTAL PRECIPITATION FOR MONTH ............2.20 DEPARTURE....-0.60 ASOS..............2.23 TOTAL PRECIPITATION FOR THE YEAR..........47.31 DEPARTURE....+2.49 ASOS.............48.54 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.....-1.5 TOTAL SNOWFALL FOR THE SEASON...............3.0 DEPARTURE.....+1.3 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/.../.. 15 SSW 11/19 our morning low temp: 41F; the normal low is now 33F NEW DAILY RECORD FOR NOVEMBER 2009 A new daily rainfall record set for November 14 at 2.08 inches; the previous record was 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 19 HIGH 72 IN 1941 LOW 10 IN 1936 PRECIP 1.92 INCHES IN 1926 SNOWFALL 11.0 INS IN 1986 PEAK GUST 59e E IN 1945 RECORDS FOR NOVEMBER 20 HIGH 72 IN 1953 LOW 10 IN 1894 PRECIP 2.78 INS IN 1988 SNOWFALL 3.0 INS IN 1897 PEAK GUST 73e S IN 1950 TODAY'S REPORT PREPARED BY: Stephanie Radner