BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, AUGUST 26, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME ANOTHER VERY WARM LATE AUGUST DAY BUT WITH LOWERING HUMIDITY AND A GUSTY BREEZE Temperatures had reached the mid 80's by early afternoon after a morning low of 66F. Today's average will again be well above the normal by at least 7 degrees. However, a cold front was expected to pass later today or this evening ushering in much cooler and drier air. Winds today started out from the south-southwest but are veering very gradually to southwest and to west-southest to west this afternoon. Wind gusts have been increasing to 25 to 30 MPH. Today's observations: 7 A.M. Weather: Clear, cirrus west through north Temperature: 69F, Dew point: 65F, Wind: SW at 12 kts, Wind: gust to 23 kts past hour Sea-level pressure: 29.97 inches Hg, rising Visibility: 12 miles, hazy 6-hour minimum temp: 66F BHO SA 1155 CLR 12 150/69/65/2212/997/ CI W-N HAZY GST TO 23 KTS PST HR/ 8/001 55003 10069 20066 10 A.M. Weather: Clear, cirrus west through northeast Temperature: 79F, Dew point: 63F, Wind: SW at 14G26 kts, Wind: Peak wind 26 kts WSW 9:51 a.m., Wind: direction variable south to west Sea-level pressure: 29.94 inches Hg, falling Visibility: 25 miles, hazy BHO SA 1455 CLR 25 138/79/63/2314G26/994/ CI W-NE HAZY PK WND 2426/51/ WND 19V26/ 8/001 58012 1 P.M. Weather: Scattered cirrus, few cumulus fractus and cumulus forming, dense cirrus layer WNW-N Temperature: 84F, Dew point: 62F, Wind: SW at 14G22 kts, Wind: direction variability S to W Sea-level pressure: 29.88 inches Hg, falling Visibility: 30 miles, light haze all quadrants 6-hourly max. temp: 84F BHO SA 1755 200 SCT 250 SCT 30 119/84/62/2314G22/988/ FEW CUFRA/CU FRMG DENS CI LYR WNW-N FEW HIER CI NE-E LGT HZ WND 19V27/ 8/102 56019 10084 20069 WEATHER SUMMARY FOR TUESDAY, AUGUST 25 TEMPERATURE (DEGREES F) MAX.....82 NORMAL.....77 MIN.....65 NORMAL.....59 MEAN....74 NORMAL.....68 DEPARTURE FROM 30-YEAR AVERAGE..........+ 6 TOTAL DEPARTURE FOR THE MONTH...........+94 [+3.6 DEGREES/DAY] HEATING DEGREE DATA WILL RESUME IN SEPTEMBER PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............21 S AT 9:25 P.M. * AEROVANE..............20 S AT 9:25 P.M. ASOS..................20 S AT 9:26 P.M. DAVIS.................19 S AT 9:25 P.M. FASTEST MILE FOR YESTERDAY...............13 S AT 9:37 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............14 S AT 9:39 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........14 S AT 9:38 P.M. AVERAGE WIND SPEED AND DIRECTION....... 7.8 S ASOS.................7.8 DAVIS............... 7.4 W [270 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..........1.71 DEPARTURE....-1.51 ASOS..............1.72 TOTAL PRECIPITATION FOR THE YEAR..........32.97 DEPARTURE....+0.34 ASOS.............34.10 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/+1/0/762/91 16 S 8/15 88/66/77/+7/0/810/97 18 S 8/16 90/68/79/+9/0/749/90 22 S 8/17 91/69/80/+10/0/754/91 21 WSW 8/18 91/72/82/+12/0/776/94 29 SSW 8/19 89/71/80/+10/0/717/87 23 SW 8/20 83/70/77/+8/0.34/558/68 21 SSE TSTM 8/21 88/72/80/+11/T/385/47 40 S AERO 39 MPH S 8/22 86/71/79/+10/0.03/629/77 28 S 8/23 86/69/78/+9/0.50/367/45 25 S * 8/24 84/67/76/+7/0/.../.. 30 N 8/25 82/65/74/+6/0/.../.. 21 S 8/26 morning low temp: 66F; the normal low is now 59F * rainfall total on fringes of Hurricane Bill was 0.53 inch NEW DAILY RECORDS FOR AUGUST 2009 TO DATE... 8/19: RECORD HIGH MINIMUM TEMPERATURE 71F; equals record previously set in 2002 8/23: RECORD HIGH MINIMUM TEMPERATURE 69F; equals record previously set in 1906 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR AUGUST 26 HIGH 96 IN 1900, 1948 LOW 46F IN 1885 PRECIP 5.85 INCHES IN 1924 PEAK GUST 55e MPH NNW 1947 RECORDS FOR AUGUST 27 HIGH 99F IN 1948 LOW 44F IN 1885 PRECIP 2.77 INCHES IN 1946 PEAK GUST 48 MPH NW 1983 TODAY'S REPORT PREPARED BY: Robert Skilling