BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, AUGUST 20, 2010 ALL TIMES ARE IN EASTERN STANDARD TIME ANOTHER SUNNY DAY WITH ABOVE NORMAL TEMPS. ONLY 0.01 INCH OF RAIN OVERNIGHT Today has been a mostly sunny day since early morning clouds have cleared out. We measured just 0.01 inch of rain that fell between midnight and 1:00AM EDT. The high temperature through 2PM EDT was 85F and the low so far today was 67F, so the average is likely to be 7 or 8 degrees above normal. Dew points have been dropping steadily all day from the 60s to the 40s. Visibility is up to 70 miles this afternoon with the help of the dry air and a nice breeze. Today's observations: 7 A.M. Weather: Overcast altocumulus, few altocumulus lenticularis north, breaks in overcast all quadrants Temperature: 71F, Dew point: 64F; Wind: W at 6 kts Sea-level pressure: 29.88 inches Hg, rising Visibility: 15 miles, hazy 6-hour minimum temp: 67F 24-hour precipitation: 0.01 inch BHO SA 1155 E120 OVC 15 120/71/64/2806/988/ FEW ACSL N BRKS IOVC ALQDS HAZY/ 8/04/ 51014 MANUAL 70001 ASOS 70001 10071 20067 10 A.M. Weather: Broken cumulus, broken altocumulus lenticularis, broken cirrus, hazy Temperature: 79F, Dew point: 59F; Wind: WNW @ 11 kts Wind: Direction variable WSW to NNW Sea-level pressure: 29.90 inches Hg, rising Visibility: 20 miles, hazy BHO SA 1455 E30 BKN 140 BKN 250 BKN 20 124/79/59/2911/990/ ACSL NE HAZY WND 25V34/ 8/141 52004 1 P.M. Weather: Clear, few cumulus Temperature: 84F, Dew point: 48F; Wind: W at 12 kts, Wind: Direction variable SW to NW Sea-level pressure: 29.91 inches Hg, rising Visibility: 70 miles Max. temp: 6 hours: 85F BHO SA 1755 CLR 70 128/84/48/2812/991/ FEW CU WND 23V32/ 8/100 53004 10085 20071 WEATHER SUMMARY FOR THURSDAY, AUGUST 19 TEMPERATURE (DEGREES F) MAX.....88 NORMAL.....79 MIN.....64 NORMAL.....61 MEAN....76 NORMAL.....70 DEPARTURE FROM 30-YEAR AVERAGE.................+6 TOTAL DEPARTURE FOR THE MONTH.................+57 [+2.8 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............22 SW AT 11:46 P.M. AEROVANE..............23 SW AT 11:46 P.M. ASOS..................22 WSW AT 11:47 P.M. DAVIS.................23 SW AT 11:46 P.M. THE FASTEST MILE FOR YESTERDAY...........16 SW AT 11:48 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............16 WSW AT 11:49 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE.......... 17 SW AT 11:48 P.M. AVERAGE WIND SPEED AND DIRECTION....... 7.3 SSW ASOS.................7.1 DAVIS................6.4 SSW [203 DEG] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M... 0.01 DEPARTURE........-0.12 ASOS..............0.01 TOTAL PRECIPITATION FOR THE MONTH..........1.21 DEPARTURE........-1.23 ASOS..............1.21 TOTAL PRECIPITATION FOR THE YEAR..........38.56 DEPARTURE........+6.71 ASOS.............38.25 ** ** ASOS missing rainfall due to system failure on 6/24-25 PRELIMINARY CLIMATE SUMMARY FOR AUGUST 2010 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 79/59/69/-3/0.00/512/59 22 SE 8/2 82/61/72/0/0.00/614/71 24 S 8/3 83/64/74/+2/0.00/397/46 32 SSW AERO 36 MPH SSW 8/4 89/71/80/+8/0.00/421/49 27 SSW 8/5 89/71/80/+8/0.86/103/12 30 W AERO 35 MPH W TSTM 8/6 85/62/74/+2/0.00/693/81 33 W AERO 36 MPH W 8/7 79/58/69/-2/0.00/768/90 28 SSW 8/8 84/63/74/+3/0.00/664/78 30 S 8/9 91/69/80/+9/T/637/75 25 WSW 8/10 87/69/78/+7/0.17/660/78 18 WSW 8/11 80/66/73/+2/0.00/819/97 22 NNE 8/12 80/65/73/+2/T/362/43 21 E 8/13 77/61/69/-2/0.00/780/93 22 ENE 8/14 81/58/70/0/0.00/787/94 22 SSE 8/15 78/59/69/-1/0.00/309/37 24 SSE 8/16 78/63/71/+1/0.17/.../.. 33 S AERO 36 MPH S 8/17 90/70/80/+10/T/.../.. 25 WSW AERO 27 MPH WSW 8/18 83/66/75/+5/0.00/.../.. 16 SSW 8/19 88/64/76/+6/0.01/.../.. 22 SW 8/20 our morning low temp: 67F; the normal low is 61F NEW DAILY RECORDS FOR AUGUST 2010 None DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR AUGUST 20 HIGH 93F IN 1937 LOW 48F IN 1896, 1905, 1949 PRECIP 2.71 INCHES IN 1970 PEAK GUST 47 MPH W IN 1983 RECORDS FOR AUGUST 21 HIGH 92F IN 1937, 1995 LOW 47F IN 1982 PRECIP 2.84 INCHES IN 1888 PEAK GUST 54 MPH WSW IN 2004 TODAY'S REPORT PREPARED BY: Stephanie Radner