BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, NOVEMBER 12, 2009 ALL DATA IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Overcast cirrostratus, few stratocumulus NE-SE Temperature: 43F, Dew point: 36F, Wind: NNE at 10 kts, Wind: Direction variable N to ENE Sea-level pressure: 30.36 inches Hg, rising Visibility: 25 miles, light haze 6-hour minimum temp: 41F 24-hour precip: 0.00 BHO SA 1155 E20 OVC 25 281/43/36/0210/036/ FEW SC NE-SE LGT HZ WND 35V06/ 8/507 53005 10044 20041 10 A.M. Weather: Broken stratocumulus, overcast cirrostratus Temperature: 47F, Dew point: 37F, Wind: NE at 11G25 kts, Wind: Peak gust 27 kts NE at 9:40 A.M. Wind: Direction variable from N to E Sea-level pressure: 30.36 inches Hg, rising Visibility: 45 miles, light haze BHO SA 1455 E23 BKN 200 OVC 45 282/47/37/05112G25/036/ LGT HZ PK WND 0427/40 WND 36V09/ 8/507 50001 1 P.M. Weather: Broken stratocumulus, overcast altostratus Temperature: 47F, Dew point: 38F, Wind: NE at 11G25 kts, Wind: Peak gust 28 kts NNE at 12:23 P.M. Wind: Direction variable N to E Sea-level pressure: 30.30 inches Hg, falling Visibility: 70 miles 6-hourly max. temp: 49F BHO SA 1755 E20 BKN 120 OVC 70 262/47/38/0411G25/030/ PK WND 0328/23 WND 35V09/ 8/57/ 56020 10049 20043 WEATHER SUMMARY FOR WEDNESDAY, NOVEMBER 11 TEMPERATURE (DEGREES F) MAX.....50 NORMAL.....51 MIN.....43 NORMAL.....36 MEAN....47 NORMAL.....43 DEPARTURE FROM 30-YEAR AVERAGE............+4 TOTAL DEPARTURE FOR THE MONTH............+26 [+2.2 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............18 DEPARTURE........-4 TOTAL HEATING UNITS FOR THE MONTH...........194 DEPARTURE.......-27 TOTAL HEATING UNITS FOR THE SEASON..........815 DEPARTURE........+3 TOTAL HEATING UNITS LAST SEASON TO DATE.....720 DIFFERENCE......+95 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............31 NNE AT 10:04 A.M. AEROVANE..............30 NNE AT 10:04 A.M. ASOS..................31 NE AT 10:05 A.M. DAVIS.................27 N AT 9:55 A.M. FASTEST MILE FOR YESTERDAY...............20 NNE AT 10:06 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE............20 NE AT 11:33 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........20 N AT 9:56 A.M. AVERAGE WIND SPEED AND DIRECTION.......12.0 NNE ASOS................12.3 DAVIS...............11.7 NNE [024 DEG] 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 ............0.06 DEPARTURE....-1.62 ASOS..............0.04 TOTAL PRECIPITATION FOR THE YEAR..........45.17 DEPARTURE....+1.47 ASOS.............46.35 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.....-0.8 TOTAL SNOWFALL FOR THE SEASON...............3.0 DEPARTURE.....+2.0 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 our morning low temp: 41F; the normal low is now 35F NEW DAILY RECORD FOR NOVEMBER 2009 None DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR NOVEMBER 12 HIGH 74 IN 1909 LOW 18 IN 1926 PRECIP 3.25 INCHES IN 1947 SNOWFALL 8.1 INCHES IN 1987 PEAK GUST 79e MPH NW IN 1947 RECORDS FOR NOVEMBER 13 HIGH 66 IN 1931, 1964 LOW 14 IN 1920 PRECIP 1.96 IN 1982 SNOWFALL 4.6 IN 2004 PEAK GUST 77 S IN 1982 TODAY'S REPORT PREPARED BY: Stephanie Radner