BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, NOVEMBER 20, 2009 ALL DATA IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Overcast stratus Temperature: 58F, Dew point: 58F, Wind: SE at 22G32 kts Wind: Peak gust 32 kts SE at 6:48 A.M. Sea-level pressure: 29.96 inches Hg, falling Visibility: 3 miles, fog 6-hour minimum temp: 50F 24-hour precipitation: 0.03 in. BHO SA 1155 E4 OVC 3F 145/58/58/1422G32/996/ PK WND 1432/48/ 8/6// 56028 MANUAL 6003/ ASOS 60004 MANUAL 70003 ASOS 70004 10058 20050 10 A.M. Weather: Overcast stratus Temperature: 61F, Dew point: 60F, Wind: SSE at 18G30 kts Wind: Peak gust 31 kts SSE at 9:09 A.M. Sea-level pressure: 29.88 inches Hg, falling Visibility: 20 miles 3-hour precipitation: 0.54 in. BHO SA 1455 E10 OVC 20 119/61/60/1618G30/988/ CIG RGD PK WND 1531/09/ 8/6// 58026 MANUAL 6054/ ASOS 60056 1 P.M. Weather: Broken stratocumulus Temperature: 61F, Dew point: 54F, Wind: WSW at 14G26 kts Wind: Peak gust 26 kts W at 12:54 P.M. Wind veering SSE to W Sea-level pressure: 29.83 inches Hg, falling Visibility: 45 miles 6-hour max. temp: 65F 6-hour precipitation: 0.54 in. BHO SA 1755 E30 BKN E30 BKN 45 101/61/54/2514G26/983/ PK WND 2626/54 WND 20V28 WND VEERNG/ 8/500 58018 MANUAL 6054/ ASOS 60056 10065 20058 WEATHER SUMMARY FOR THURSDAY, NOVEMBER 19 TEMPERATURE (DEGREES F) MAX.....59 NORMAL.....48 MIN.....41 NORMAL.....33 MEAN....50 NORMAL.....41 DEPARTURE FROM 30-YEAR AVERAGE.............+9 TOTAL DEPARTURE FOR THE MONTH.............+76 [+3.8 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............15 DEPARTURE........-9 TOTAL HEATING UNITS FOR THE MONTH...........329 DEPARTURE.......-77 TOTAL HEATING UNITS FOR THE SEASON..........950 DEPARTURE.......-47 TOTAL HEATING UNITS LAST SEASON TO DATE.....894 DIFFERENCE......+56 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............30 SE AT 10:50 P.M. AEROVANE..............27 SE AT 11:08 P.M. ASOS..................24 SE AT 11:08 P.M. DAVIS.................27 SE AT 10:50 P.M. FASTEST MILE FOR YESTERDAY...............23 ESE AT 10:36 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............18 SSE AT 10:53 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........21 ESE AT 10:37 P.M. AVERAGE WIND SPEED AND DIRECTION........8.6 ESE ASOS.................8.2 DAVIS................8.4 SSE [153 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.03 DEPARTURE....-0.13 ASOS..............0.04 TOTAL PRECIPITATION FOR MONTH ............2.23 DEPARTURE....-0.73 ASOS..............2.27 TOTAL PRECIPITATION FOR THE YEAR..........47.34 DEPARTURE....+2.36 ASOS.............48.58 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.....-1.6 TOTAL SNOWFALL FOR THE SEASON...............3.0 DEPARTURE.....+1.2 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 59/41/50/+9/0/.../.. 30 SE 11/20 our morning low temp: 50F; 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 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 RECORDS FOR NOVEMBER 21 HIGH 69 IN 1931 LOW 10 IN 1888 PRECIP 2.60 INCHES IN 1950 SNOWFALL 4.0 INS IN 1929 PEAK GUST 69 NW IN 1989 TODAY'S REPORT PREPARED BY: Stephanie Radner