BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, OCTOBER 10, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Sky obscured in dense fog Temperature: 60F, Dew point: 60F, Wind: WNW at 10 kts Sea-level pressure: 29.66 inches Hg, rising Visibility: 1/16 mile 6-hour minimum temp: 59F 24-hour precipitation: 0.31 inch BHO SA 1155 W1 X 1/16F 044/60/60/2910/966/ R-EUKN/ 8//// 53020 6025/ 70031 10060 20059 10 A.M. Weather: Broken stratocumulus, broken altocumulus, broken cirrus Temperature: 61F, Dew point: 57F, Wind: NW at 12G22 kts Sea-level pressure: 29.74 inches Hg, rising Visibility: 60 miles, 70 miles NW, 30 miles SE-S BHO SA 1455 15 SCT E20 BKN 130 BKN 250 BKN 60 071/61/57/ 3012G22/974/ VSBY NW 70 SE-S 30 WND 27V33/ 8/571 51027 1 P.M. Weather: Scattered stratocumulus, broken altocumulus and dense cirrus, overcast cirrus, few breaks in overcast W-N-W, sun occasionally dimly visible Temperature: 60F, Dew point: 49F, Wind: NW at 11G20 kts Wind: Peak gust 27 kts NW at 12:05 P.M. Wind: Direction variable W-NNW Sea-level pressure: 29.81 inches Hg, rising Visibility: 75 miles 6-hour maximum temp: 62F BHO SA 1755 35 SCT E120 BKN 200 OVC 75 094/60/49/3011G20/ 981/ BINOVC W-N-E SUN OCNLY DMLY VSBL PK WND 3027/05 WND 26V34/ 8/571 51023 10062 20058 WEATHER SUMMARY FOR FRIDAY, OCTOBER 9 TEMPERATURE (DEGREES F) MAX.....60 NORMAL.....63 MIN.....48 NORMAL.....45 MEAN....54 NORMAL.....54 DEPARTURE FROM 30-YEAR AVERAGE............0 TOTAL DEPARTURE FOR THE MONTH............-1 [-0.3 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............11 DEPARTURE........0 TOTAL HEATING UNITS FOR THE MONTH............88 DEPARTURE.......-2 TOTAL HEATING UNITS FOR THE SEASON..........245 DEPARTURE......-14 TOTAL HEATING UNITS LAST SEASON TO DATE.....210 DIFFERENCE.....+35 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............29 SSE AT 2:42 P.M. * AEROVANE..............28 SSE AT 2:42 P.M. ASOS..................28 S AT 2:44 P.M. DAVIS.................26 SSE AT 2:41 P.M. FASTEST MILE FOR YESTERDAY...............21 SSE AT 2:42 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............20 S AT 2:44 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........19 S AT 1:42 P.M. AVERAGE WIND SPEED AND DIRECTION.......11.6 SSE ASOS................10.8 DAVIS................9.9 S [180 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.31 DEPARTURE....+0.17 ASOS..............0.31 TOTAL PRECIPITATION FOR MONTH..............2.11 DEPARTURE....+0.85 ASOS..............2.14 TOTAL PRECIPITATION FOR THE YEAR..........39.99 DEPARTURE....+1.13 ASOS.............41.20 PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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 10/1 56/39/48/-9/0/155/22 27 WSW 10/2 60/40/50/-6/0/442/63 23 SSE 10/3 63/51/57/+1/1.10/000/00 32 ESE AERO 30 MPH ESE 10/4 67/57/62/+6/0/202/29 21 WSW 10/5 64/49/57/+2/0/595/86 33 W AERO 31 MPH W 10/6 65/45/55/0/0/628/91 25 W 10/7 67/51/59/+4/0.70/344/50 54 W AERO 54 MPH W 10/8 61/48/55/+1/0/602/88 43 W AERO 39 MPH W 10/9 60/48/54/0/.../000/00 29 SSE 10/10 morning low temp: 58F; the normal low is now 45F NEW DAILY RECORDS FOR OCTOBER 2009 10/7: NEW RECORD WIND GUST 54 MPH W AT 2005E; surpasses previous record of 52 MPH ESE in 1972 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR OCTOBER 10 HIGH 85 IN 1949 LOW 27 IN 1929 PRECIP 2.02 INCHES IN 1998 SNOWFALL 6.8 INCHES IN 1979 (RECORD FOR MONTH) PEAK GUST 59 MPH WNW IN 1958 RECORDS FOR OCTOBER 11 HIGH 80 IN 1919,1949 LOW 28 IN 1993 PRECIP 0.96 INCHES IN 1903 SNOWFALL (NONE) PEAK GUST 66e MPH WNW IN 1941 TODAY'S REPORT PREPARED BY: Mike Iacono