BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, AUGUST 27, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Thin broken cirrus, line of altocumulus and ACSL distant NE to S Temperature: 59F, Dew point: 48F, Wind: WNW at 12 kts Sea-level pressure: 30.08 inches Hg, rising Visibility: 80 miles 6-hour minimum temp: 56F BHO SA 1155 250 –BKN 80 187/59/48/3012/008/ LINE AC/ACSL DSNT NE-S/ 8/041 53014 10063 20056 10 A.M. Weather: Thin broken cirrus, stratocumulus distant E-S Temperature: 66F, Dew point: 46F, Wind: WSW at 9 kts Sea-level pressure: 30.10 inches Hg, rising Visibility: 80 miles BHO SA 1455 250 –BKN 80 192/66/46/2509/010/ SC DSNT E-S WND BCKNG PST HR/ 8/501 51005 1 P.M. Weather: Clear, stratocumulus distant east to south, few cirrus all quadrants Temperature: 72F, Dew point: 47F, Wind: WSW at 7 kts, Wind: Direction variable S to WNW Sea-level pressure: 30.08 inches Hg, falling Visibility: 80 miles 6-hourly max. temp: 72F BHO SA 1755 CLR 80 187/72/47/2407/008/ SC DSNT E-S FEW CI ALQDS WND 18V30/ 8/501 58005 10072 20059 WEATHER SUMMARY FOR WEDNESDAY, AUGUST 26 TEMPERATURE (DEGREES F) MAX.....84 NORMAL.....77 MIN.....65 NORMAL.....59 MEAN....75 NORMAL.....68 DEPARTURE FROM 30-YEAR AVERAGE...........+7 TOTAL DEPARTURE FOR THE MONTH..........+101 [+3.7 DEGREES/DAY] HEATING DEGREE DATA WILL RESUME IN SEPTEMBER PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............32 W AT 2:20 P.M. AEROVANE..............30 W AT 2:20 P.M. ASOS..................30 WNW AT 2:20 P.M. DAVIS.................32 W AT 2:20 P.M. FASTEST MILE FOR YESTERDAY...............24 W AT 2:19 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............22 W AT 2:21 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........24 W AT 2:20 P.M. AVERAGE WIND SPEED AND DIRECTION........13.8 SW ASOS.................13.0 DAVIS............... 13.6 WSW [239 DEG] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE....-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........1.71 DEPARTURE....-1.65 ASOS..............1.72 TOTAL PRECIPITATION FOR THE YEAR..........32.97 DEPARTURE....+0.20 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 84/65/75/+7/0/.../.. 32 W 8/27 our morning low temp: 56F; the normal low is now 59F 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 27 HIGH 99F IN 1948 LOW 44F IN 1885 PRECIP 2.77 INCHES IN 1946 PEAK GUST 48 MPH NW 1983 RECORDS FOR AUGUST 28 HIGH 95F IN 1948 LOW 43F IN 1885 PRECIP 1.80 INCHES IN 1922 PEAK GUST 87 MPH SSE 1971 TODAY'S REPORT PREPARED BY: Stephanie Radner