BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, AUGUST 14, 2011 ALL TIMES ARE IN EASTERN STANDARD TIME LIGHT RAIN OBSERVED AT THE SUMMIT THIS MORNING The humidity has returned along with foggy conditions at the summit this morning. There was some light rain that ended before the first observation, and an additional 0.01 in. between 8:00 EDT and 11:00 EDT. Aside from that, skies have remained mostly cloudy to overcast throughout the day, keeping temperatures in the low to mid 70s. Winds have been predominately out of the south, with wind gusts around 20 mph. There is more rainfall expected tonight, through tomorrow, and possibly into Tuesday. Today's observations: 7 A.M. Weather: Broken stratus fractus, overcast altostratus, foggy with patches of light fog drifting below summit, sun dimly visible, hazy Temperature: 69F, Dew point: 68F; Wind: SSE at 10 kts Sea-level pressure: 30.09 inches Hg, rising Visibility: 15 miles, hazy 6-hour min. temp: 68F 6-hour precip: 0.02 inch 24-hour precip: 0.02 inch BHO SA 1155 E50 BKN 100 OVC 15 165/69/68/1610/002/ PTCHS LGT FG DRFTG BLO SMT SUN DMLY VSBL HAZY R-BUKNE35/ 8/77/ 51003 ASOS 60003 ASOS 70003 MANUAL 60002 MANUAL 70002 10069 20068 10 A.M. Weather: Scattered cumulus fractus pannus, broken altocumulus, broken altostratus translucidus, sun dimly visible, hazy, light rain shower distant N Temperature: 72F, Dew Point: 68F; Wind: S at 8 kts Wind: Direction variable ESE-SSW Sea-level pressure: 30.01 inches Hg, falling Visibility: 25 miles, hazy 3-hour precip: 0.01 inch BHO SA 1455 15 SCT E70 BKN 130 BKN 25 164/72/68/1908/001/ SUN DMLY VSBL HAZY –SHRA DSNT N WND 12V20/ 8/77/ 58001 ASOS 60001 MANUAL 60001 1 P.M. Weather: Very light drizzle, broken stratus developing into stratus fractus/cumulus fractus pannus, overcast altostratus translucidus, sun dimly visible, light distant haze Temperature: 73F, Dew Point: 66F; Wind: SSE at 9 kts Wind: Direction variable ESE-SSW Sea-level pressure: 29.99 inches Hg, falling Visibility: 25 miles, light distant haze 6-hour max. temp: 74F 6-hour precip: 0.01 inch BHO SA 1755 E30 BKN 150 OVC 25L- 159/73/66/1609/999/ SUN DMLY VSBL LGT DSNT HAZE WND 11V20 L-B20E55 PCPN VRY LGT/ 8/61/ 56005 ASOS 60001 MANUAL 60001 10074 20069 WEATHER SUMMARY FOR SATURDAY, AUGUST 13 TEMPERATURE (DEGREES F) MAX.....82 NORMAL.....80 MIN.....63 NORMAL.....62 MEAN....73 NORMAL.....71 DEPARTURE FROM 30-YEAR NORMAL....................+2 TOTAL DEPARTURE FOR THE MONTH....................+10 [+0.6 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY..............15 SSW AT 7:59 P.M. * AEROVANE...............21 SSW AT 7:58 P.M. * ASOS...................17 SW AT 8:00 P.M. DAVIS..................17 SSW AT 7:59 P.M. THE FASTEST MILE FOR YESTERDAY............13 SSW AT 7:42 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.............13 SSW AT 10:47 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE............12 SSW AT 8:01 P.M. AVERAGE WIND SPEED AND DIRECTION.........7.2 SSW ASOS..................8.0 DAVIS.................6.7 SW [215 deg] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.02 DEPARTURE.........-0.11 ASOS..............0.03 TOTAL PRECIPITATION FOR THE MONTH..........3.50 DEPARTURE.........+1.84 ASOS..............3.49 TOTAL PRECIPITATION FOR THE YEAR..........33.19 DEPARTURE.........+2.12 ASOS..............33.67** **ASOS data is in error due to system failure on 1/12-13 PRELIMINARY CLIMATE SUMMARY FOR AUGUST 2011 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 91/69/80/+8/T/503/58 24 S 8/2 88/63/76/+4/0.15/657/76 27 NNE AERO 34 MPH TSTM 8/3 76/59/68/-4/0.00/673/78 18 ENE AERO 25 MPH 8/4 77/62/70/-2/0.00/783/91 20 NE 8/5 78/61/70/-2/0.00/575/67 20 SE 8/6 85/66/76/+4/0.01/265/31 22 SSW AERO 28 MPH 8/7 73/67/70/-1/1.09/000/00 33 SSE AERO 39 SSE 8/8 80/70/75/+4/0.26/.../.. 15 NNW 8/9 77/64/71/0/0.82/.../.. 29 ESE AERO 36 MPH RMY 32 MPH TSTM 8/10 79/61/70/-1/1.15/.../.. 18 W AERO 21 MPH RMY 18 MPH 8/11 79/61/70/-1/0.00/.../.. 24 W AERO 29 MPH RMY 27 MPH 8/12 81/58/70/-1/0.00/.../.. 18 WNW AERO 25 MPH RMY 21 MPH 8/13 82/63/73/+2/0.00/.../.. 15 SSW AERO 21 MPH RMY 19 MPH 8/14 our overnight low temp: 68F; the normal low now 62F DAILY RECORDS FOR AUGUST 2011 None so far. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR AUGUST 14 HIGH 99F IN 2002 LOW 46F IN 1964 PRECIP 3.06 INCHES IN 1919 PEAK GUST 61 MPH WNW IN 1963 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 TODAY'S REPORT PREPARED BY: George A. Tabeek