BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, AUGUST 17, 2013 ALL TIMES ARE IN EASTERN STANDARD TIME BEAUTIFUL SUMMER WEATHER CONTINUES... It has been another nice day on the summit today. The morning low temperature of 59F was a little warmer than the day before, but the dew point is holding in the middle 50s today. The sky was nearly free of clouds this morning, though a veil of thin cirrus clouds have advanced into the area by late morning. Cumulus and a few moderate cumulus are building inland away from the coast at mid-day. The wind direction has gradually veered from W at midnight through N to ENE during the morning, though the wind speed has remained light all day. The barometric pressure near 30.30 inches today is the highest of the month so far. Today's Observations: 7 A.M. Weather: Thin scattered cirrus, few lower cirrus, hazy Temperature: 63F; Dew Point: 55F; Wind: N at 9 kts Sea-level pressure: 30.27 ins. Hg, rising Visibility: 40 miles, hazy 6-hr min. temp: 59F BHO SA 1155 250 –SCT 40 249/63/55/3509/027/ FEW LWR CI HAZY/ 8/001 51012 10063 20059 10 A.M. Weather: Thin broken cirrus, few cumulus building distant W-NW, wind gradually veering, hazy Temperature: 73F; Dew Point: 56F; Wind: ENE at 8 kts, Wind: Direction variable NNE-E Sea-level pressure: 30.30 ins. Hg, rising Visibility: 40 miles, hazy BHO SA 1455 250 –BKN 40 260/73/56/0608/030/ FEW CU BLDG DSNT W-NW WND 03V09 WND GRDLY VEERING HAZY/ 8/101 53011 1 P.M. Weather: Thin broken cirrus, cumulus SSE-N, few moderate cumulus, few lower and higher cirrus, hazy Temperature: 74F; Dew Point: 55F; Wind: E at 8 kts Sea-level pressure: 30.29 ins. Hg, falling slightly Visibility: 40 miles, hazy 6-hr max. temp: 75F BHO SA 1755 250 –BKN 40 256/74/55/0808/029/ CU SSE-N FEW MDT CU FEW LWR CI FEW HIR CI HAZY/ 8/201 58004 10075 20063 WEATHER SUMMARY FOR FRIDAY, AUGUST 16, 2013 TEMPERATURE (DEGREES F) MAX.....77 NORMAL.....79 MIN.....57 NORMAL.....62 MEAN....67 NORMAL.....71 DEPARTURE FROM 30-YEAR NORMAL.......................-4 TOTAL DEPARTURE FOR THE MONTH......................-42 [-2.8 DEGREES/DAY] COOLING DEGREE DAYS (SEASON JAN TO DEC) TOTAL COOLING UNITS FOR YESTERDAY.............2 DEPARTURE.........-4 TOTAL COOLING UNITS FOR THE MONTH............65 DEPARTURE........-44 TOTAL COOLING UNITS FOR THE SEASON..........548 DEPARTURE........+88 TOTAL COOLING UNITS LAST SEASON TO DATE.....622 DIFFERENCE.......-74 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY................20 W AT 10:17 A.M. AERO.....................19 W AT 10:53 A.M. ASOS.....................21 WSW AT 10:53 A.M. DAVIS....................20 W AT N/A RMY 21 FASTEST MILE FOR YESTERDAY..................16 W AT 10:06 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...............16 W AT 10:06 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..............16 W AT N/A AVERAGE WIND SPEED AND DIRECTION..........10.5 W ASOS....................9.8 DAVIS...................8.9 WSW [252 deg.] 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..........2.55 DEPARTURE............+0.32 ASOS..............2.60 TOTAL PRECIPITATION FOR THE YEAR..........37.84 DEPARTURE............+4.62 ASOS..............N/A* *ASOS malfunctioned during storm on 2/8-9, leading to erroneous totals PRELIMINARY CLIMATE SUMMARY FOR AUGUST 2013 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust RMY: RMY = R.M. Young wind gust recording system added 8/9/2011 TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 8/1 81/62/72/0/0.01/503/58 25 S AERO 26 MPH S RMY 27 8/2 81/62/72/0/0.23/518/60 26 W AERO 26 MPH W RMY 28 8/3 77/63/70/-2/T/276/32 22 WSW AERO 23 MPH WSW RMY 23 8/4 79/58/69/-3/T/645/75 25 WNW AERO 21 MPH WNW RMY 26 8/5 75/54/65/-7/0.00/858/100 26 WNW AERO 25 MPH WNW RMY 27 8/6 78/56/67/-5/0.00/846/99 17 ESE AERO 15 MPH S RMY 16 8/7 80/59/70/-2/0.00/759/89 21 S AERO 21 MPH S RMY N/A 8/8 79/62/71/-1/0.08/153/18 25 S AERO 25 MPH S RMY N/A 8/9 73/70/72/0/2.21/000/00 37 S AERO 39 MPH S RMY 40 8/10 81/61/71/-1/0.00/795/94 30 WNW AERO 31 MPH WNW RMY 31 8/11 78/58/68/-3/0.00/835/99 18 W AERO 18 MPH W RMY 21 8/12 81/62/72/+1/0.00/.../.. 18 W AERO 17 MPH WSW RMY 19 8/13 73/64/69/-2/0.02/.../.. 16 SSE AERO 15 MPH SSE RMY N/A 8/14 73/57/65/-6/0.00/.../.. 35 W AERO 35 MPH W RMY 35 8/15 75/53/64/-7/0.00/.../.. 23 W AERO 23 MPH W RMY 24 8/16 77/57/67/-4/0.00/.../.. 20 W AERO 19 MPH W RMY 21 8/17 morning low temp: 59F; the normal low is now 62F DAILY RECORDS FOR AUGUST 2013 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR AUGUST 17 HIGH 97F IN 1944 LOW 48F IN 1902 PRECIP 2.17 INCHES IN 1998 PEAK GUST 50e MPH SSW IN 1952, 50 MPH WNW IN 1962 RECORDS FOR AUGUST 18 HIGH 93F IN 2002 LOW 47F IN 1824 PRECIP 5.75 INCHES IN 1955 [DIANE] PEAK GUST 46 MPH WNW IN 2007 TODAY'S REPORT PREPARED BY: Mike Iacono