BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, OCTOBER 24, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME WARM WITH OCCASIONAL RAIN SHOWERS THIS MORNING... WINDS ARE INCREASING FROM THE SOUTH THIS AFTERNOON... Rain that began Friday night has amounted to 0.18 inch as of 2 PM EDT. Rain showers this morning have been mostly light, though a few have brought briefly heavy rain. The sun has briefly appeared through the low clouds a few times since mid-day, and the temperature has soared into the mid-60s. Light SE winds this morning have veered to the S and have increased significantly after noon. The peak gust so far today has been 53 mph S at 2:38 PM EDT with a peak of 52 mph S on ASOS and 50 mph S on our Aerovane wind system. Today's observations: 7 A.M. Weather: Sky obscured in dense fog Temperature: 47F, Dew point: 47F, Wind: ESE at 11 kts Sea-level pressure: 29.98 inches Hg, falling Visibility: 1/4 mile 6-hour minimum temp: 42F 24-hour precipitation: 0.10 inch BHO SA 1155 W2 X 1/4F 152/47/47/1211/998/ 8//// 56027 600// 70010 10047 20042 10 A.M. Weather: Sky obscured, light rain shower and dense fog Temperature: 54F, Dew point: 54F, Wind: SE at 10 kts Wind: Peak gust to 20 knots past hour Sea-level pressure: 29.91 inches Hg, falling Visibility: 1/8 mile 3-hour precipitation: 0.02 inch BHO SA 1455 W2 X 1/8RW-F 129/54/54/1510/991/ RB50 RW- BRFLY RW GST 20 KTS PST HR/ 8//// 58023 6002/ 1 P.M. Weather: Scattered stratus, overcast stratocumulus, few lower stratus fractus, few breaks in overcast overhead-SE with the sun occasionally dimly visible, very light rain shower Temperature: 64F, Dew point: 63F, Wind: S at 26G33 kts Wind: Peak gust 33 kts, 38 mph S at 12:52 P.M. EST Sea-level pressure: 29.82 inches Hg, falling Visibility: 8 miles 6-hour maximum temp: 64F 6-hour precipitation: 0.08 inch BHO SA 1755 5 SCT E15 BKN 65 OVC 8RW- 098/64/63/1726G33/ 982/ FEW LWR STFRA BINOVC OVHD-SW SUN BRFLY DMLY VSBL RB25E35B50 PCPN VRY LGT PK WND 1733/52/ 8/6// 58031 6008/ 10064 20047 WEATHER SUMMARY FOR FRIDAY, OCTOBER 23 TEMPERATURE (DEGREES F) MAX.....57 NORMAL.....58 MIN.....38 NORMAL.....41 MEAN....48 NORMAL.....49 DEPARTURE FROM 30-YEAR AVERAGE...........-1 TOTAL DEPARTURE FOR THE MONTH...........-70 [-3.2 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............17 DEPARTURE.......+1 TOTAL HEATING UNITS FOR THE MONTH...........348 DEPARTURE......+64 TOTAL HEATING UNITS FOR THE SEASON..........505 DEPARTURE......+52 TOTAL HEATING UNITS LAST SEASON TO DATE.....402 DIFFERENCE....+103 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............35 NW AT 12:56 A.M. AEROVANE..............32 NW AT 12:56 A.M. * ASOS..................32 NNW AT 12:56 A.M. DAVIS.................36 WNW AT 12:57 A.M. FASTEST MILE FOR YESTERDAY...............25 NW AT 12:57 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE............22 NNW AT 12:59 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........25 WNW AT 12:57 A.M. AVERAGE WIND SPEED AND DIRECTION.......11.8 ENE ASOS................11.0 DAVIS...............10.9 NNE [019 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.10 DEPARTURE....-0.04 ASOS..............0.10 TOTAL PRECIPITATION FOR MONTH..............4.63 DEPARTURE....+1.41 ASOS..............4.60 TOTAL PRECIPITATION FOR THE YEAR..........42.51 DEPARTURE....+1.69 ASOS.............43.66 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 60/48/54/0/0.05/000/00 29 SSE 10/10 62/42/52/-2/0.26/205/30 37 NW 10/11 61/39/50/-3/0/655/97 35 WSW AERO 33 MPH W 10/12 53/36/45/-8/T/471/70 23 SSW 10/13 51/36/44/-8/0.20/074/11 35 WNW 10/14 52/32/42/-10/0/494/74 27 NW 10/15 41/32/37/-15/0.19/000/00 29 NNE 10/16 41/33/37/-14/0.24/000/00 37 NNE AERO 35 MPH NNE T SNOW 10/17 48/33/41/-10/0/250/38 35 NNE 10/18 46/32/39/-12/1.79/000/00 43 NNE SNOWFALL 3.0 INS 10/19 52/33/43/-8/0/.../.. 25 NNW 10/20 65/38/52/+2/0/.../.. 23 W * 10/21 68/48/58/+8/0/.../.. 19 W 10/22 74/50/62/+12/0/.../.. 30 S 10/23 57/38/48/-1/0/.../.. 35 NW AERO 32 MPH NW 10/24 morning low temp: 42F; the normal low is now 40F * Mean temperature for the 20th corrected from 55 to 52. 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 10/15: NEW RECORD LOW MAXIMUM TEMPERATURE 41; surpasses previous 47 set in 1887 and 1896 10/16: NEW RECORD LOW MAXIMUM TEMPERATURE 41; surpasses previous 42 set in 1940 10/16: NEW RECORD DAILY SNOWFALL TRACE; surpasses previous zero for the date 10/18: NEW RECORD DAILY SNOWFALL 3.0 INS; surpasses previous trace in 1972 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR OCTOBER 24 HIGH 79 IN 1963 LOW 22 IN 1969 PRECIP 2.96 INCHES IN 1890 SNOWFALL 1.8 INCHES IN 1960 PEAK GUST 70 MPH SE IN 1959 RECORDS FOR OCTOBER 25 HIGH 81 IN 1963 LOW 26 IN 1922,1939 PRECIP 2.45 INCHES IN 2005 SNOWFALL 1.2 INCHES IN 1960 PEAK GUST 72 MPH ESE IN 1980 TODAY'S REPORT PREPARED BY: Mike Iacono