BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, AUGUST 15, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME SUNNY AND WARM WITH CHANGABLE HUMIDITY TODAY... A completely clear sky early this morning slowly filled with scattered cumulus during the morning with a some cumulus mediocris by early afternoon. Humidity has been high in the middle 60s much of the day, but is has dropped to the low 60s as of 2 PM EDT when visibility improved to about 40 miles. Today's observations: 7 A.M. Weather: Clear sky, thin fog all quadrants, hazy Temperature: 69F, Dew point: 66F, Wind: SW at 7 kts Sea-level pressure: 30.19 inches Hg, rising Visibility: 20 miles, hazy 6-hour minimum temp: 66F BHO SA 1155 CLR 20 222/69/66/2307/019/ THN FG ALQDS VSBY NNW-NE 15 HAZY WND LGT/ 51010 10069 20066 10 A.M. Weather: Clear, few small cumulus, hazy Temperature: 81F, Dew point: 65F, Wind: S at 5 kts Sea-level pressure: 30.19 inches Hg, steady Visibility: 30 miles, hazy BHO SA 1455 CLR 30 222/81/65/1905/019/ FEW SML CU S-NNE HAZY WND LGT/ 8/100 55000 1 P.M. Weather: Scattered cumulus, hazy Temperature: 87F, Dew point: 61F, Wind: SW at 7 kts Wind: Light and variable Sea-level pressure: 30.16 inches Hg, falling Visibility: 40 miles, hazy 6-hourly max. temp: 87F BHO SA 1755 35 SCT 40 212/87/61/2107/016/ HAZY WND LGT AND VRB/ 8/200 56010 10087 20069 WEATHER SUMMARY FOR FRIDAY, AUGUST 14 TEMPERATURE (DEGREES F) MAX.....83 NORMAL.....80 MIN.....58 NORMAL.....61 MEAN....71 NORMAL.....70 DEPARTURE FROM 30-YEAR AVERAGE..........+1 TOTAL DEPARTURE FOR THE MONTH...........-5 [-0.6 DEGREES/DAY] HEATING DEGREE DATA WILL RESUME IN SEPTEMBER PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............16 S AT 11:23 P.M. * AEROVANE..............15 SSW AT 11:56 P.M. ASOS..................14 SSW AT 11:22 P.M. DAVIS.................N/A FASTEST MILE FOR YESTERDAY...............11 SSW AT 11:56 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............12 SW AT 11:59 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........N/A AVERAGE WIND SPEED AND DIRECTION........6.3 S ASOS.................5.0 DAVIS................4.7 W [267 DEG] * last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE....-0.13 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........0.84 DEPARTURE....-0.95 ASOS..............0.84 TOTAL PRECIPITATION FOR THE YEAR..........32.10 DEPARTURE....+0.90 ASOS.............33.22 PRELIMINARY CLIMATE SUMMARY FOR AUGUST 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 8/1 83/63/73/+1/0/823/95 18 SSE 8/2 77/64/71/-1/T/104/12 25 SSE 8/3 84/67/76/+4/0/638/74 17 SW 8/4 83/66/75/+3/0/714/83 23 S 8/5 86/67/77/+5/T/378/44 27 SSW TSTM 8/6 76/61/69/-3/0/564/66 18 SSE 8/7 79/58/69/-2/0/836/98 32 W 8/8 74/55/65/-6/0/791/93 21 WNW 8/9 76/59/68/-3/T/178/21 25 SSE 8/10 87/66/77/+6/0.12/584/69 27 W TSTM 8/11 84/66/75/+4/0.54/684/81 25 NE TSTM 8/12 67/63/65/-6/T/000/00 18 N 8/13 66/60/63/-8/0.18/042/05 23 NNE 8/14 83/58/71/+1/0/.../.. 16 S 8/15 morning low temp: 66F; the normal low is now 61F NEW DAILY RECORDS FOR AUGUST 2009 TO DATE... NONE DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR AUGUST 15 HIGH 95F IN 1928 LOW 47F IN 1964 PRECIP 1.55 INCHES IN 2004 PEAK GUST 44e MPH S IN 1941 RECORDS FOR AUGUST 16 HIGH 95F IN 1944 LOW 50F IN 1927 PRECIP 1.47 INCHES IN 1926 PEAK GUST 45e MPH N IN 1951 TODAY'S REPORT PREPARED BY: Mike Iacono