BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, AUGUST 5, 2008 ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED COOL MARINE AIRMASS OVER US TODAY A cool northeast wind flow of maratime air arrived early today as winds veered from northwest to northeast. High temperatures were checked in the low 70's under partly sunny to mostly cloudy skies. Today's observations: 8 A.M. EDT Weather: Scattered cumulus, overcast stratocumulus, breaks in overcast Temperature: 65F, Dew point: 61F, Wind: NE at 9 kts Sea-level pressure: 29.99 inches Hg, rising Visibility: 50 miles, mountain in cloud 45 WNW 6-hourly minimum temperature: 64F 24-hourly rainfall: 0.01 inch BHO SA 1155 18 SCT E28 OVC 50 157/65/61/0409/999/ BINOVC ALQDS VSBY LWR SW-NE MTN INCLD 45 WNW WND 01V07/ 8/800 50010 MANUAL 70001 10066 20064 11 A.M. EDT Weather: Scattered cumulus, moderate cumulus, broken stratocumulus, cirrus, cirrocumulus Temperature: 71F, Dew point: 58F, Wind: NE at 10 kts, Wind: direction variability is north thru east Sea-level pressure: 30.01 inches Hg, rising Visibility: 60 miles, lower southwest thru northwest BHO SA 1455 17 SCT E22 BKN 250 BKN 60 161/71/58/0510/001/ FEW MDT CU FEW CC VSBY LWR SW-NW WND 36V09/ 8/801 53004 2 P.M. EDT Weather: Broken stratocumulus, few cumulus, moderate cumulus Temperature: 70F, Dew point: 60F, Wind: ENE at 10 kts, Wind: Direction variability NNE-E Sea-level pressure: 30.01 inches Hg, steady Visibility: 60 miles, SW-NW 40 miles 6-hour max. temp. 72F BHO SA 1755 E50 BKN 60 161/70/60/0610/001/ FEW CU/MDT CU ALQDS VSBY SW-NW 40 WND 03V10/ 8/800 50000 10072 20065 WEATHER SUMMARY FOR MONDAY, AUGUST 4 TEMPERATURE (DEGREES F) MAX.....79 NORMAL.....81 MIN.....60 NORMAL.....63 MEAN....70 NORMAL.....72 DEPARTURE FROM 30-YEAR NORMAL.............-2 TOTAL DEPARTURE FOR THE MONTH.............+2 [+0.3 DEGREES/DAY] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............25 WNW AT 12:54 P.M. * AEROVANE.............25 WNW AT 12:54 P.M. ASOS.................25 WNW AT 12:54 P.M. DAVIS................27 WNW AT 10:11 A.M. FASTEST MILE FOR YESTERDAY..............20 WNW AT 12:56 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........20 WNW AT 12:57 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........20 WNW AT 12:57 P.M. AVERAGE............10.5 WNW ASOS...............10.3 DAVIS..............11.0 WNW [290 deg] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01 DEPARTURE......-0.12 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.37 DEPARTURE......+0.88 ASOS..............1.42 TOTAL PRECIPITATION FOR THE YEAR..........32.30 DEPARTURE......+2.40 ASOS.............34.85 # # Includes erroneous ASOS precipitation data on 2/13/08. PRELIMINARY CLIMATE SUMMARY FOR AUGUST 2008 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 8/1 85/66/76/+4/0.00/.../.. 16 WSW 8/2 80/65/73/+1/0.80/.../.. 21 NW TSTM * 8/3 81/61/71/-1/0.56/.../.. 52 NW Aero 55 MPH NW TSTM 8/4 79/60/70/-2/0.01/.../.. 25 WNW 8/5 morning low temp: 64F; our normal low is now 63F NEW DAILY RECORDS FOR AUGUST 8/3 - PEAK GUST OF 52 MPH FROM THE NW IS NEW RECORD FOR THE DATE; PREVIOUS RECORD 41 MPH NE IN 1964 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR AUGUST 5 HIGH 98F IN 1955 LOW 48F IN 1929,1972 PRECIP 3.03 INCHES IN 1893 PEAK GUST 60e MPH SW 1977 RECORDS FOR AUGUST 6 HIGH 95F IN 1931 LOW 48F IN 1934 PRECIP 1.47 INCHES IN 1995 PEAK GUST 44e MPH SSW IN 1940 TODAY'S REPORT PREPARED By: Robert Skilling