BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, SEPTEMBER 19, 2008 ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED Today's observations: 8 A.M. EDT Weather: Scattered stratocumulus Temperature: 50F, Dew point: 42F, Wind: NNE at 9G18 kts Wind: direction variability NNW-ENE Sea-level pressure: 30.51 inches Hg, rising Visibility: 60 miles, NW 70 miles 6-hourly minimum temperature: 47F 24-hourly rainfall: 0.00 inch BHO SA 1155 33 SCT 60 332/50/42/0209G18/051/ WND 33V07/ 8/500 51023 10050 20047 11 A.M. EDT Weather: Clear, few stratocumulus all quadrants Temperature: 55F, Dew point: 38F, Wind: NNE at 12 kts Wind: direction variability NW-E Sea-level pressure: 30.53 inches Hg, rising Visibility: 70 miles BHO SA 1455 CLR 70 340/55/38/0312/053/ FEW SC ALQDS WND 32V09/ 8/500 51008 2 P.M. EDT Weather: Clear, few stratocumulus all quadrants Temperature: 55F, Dew point: 39F, Wind: NE at 9 kts, Wind: direction variability NNW-E Sea-level pressure: 30.51 inches Hg, falling Visibility: 65 miles 6-hour max. temp: 57F BHO SA 1755 CLR 65 332/55/39/0409/051/ FEW SC ALQDS WND 33V09/ 8/500 58008 10057 20050 WEATHER SUMMARY FOR THURSDAY, SEPTEMBER 18 TEMPERATURE (DEGREES F) MAX.....65 NORMAL.....70 MIN.....49 NORMAL.....53 MEAN....57 NORMAL.....61 DEPARTURE FROM 30-YEAR NORMAL.............-4 TOTAL DEPARTURE FOR THE MONTH............+43 (+2.2 DEGREES/DAY) PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............30 NNE AT 10:28 A.M. AEROVANE.............28 NNE AT 10:28 A.M. ASOS.................30 NE AT 10:28 A.M. DAVIS................30 NNE AT 10:27 A.M. FASTEST MILE FOR YESTERDAY..............20 NNE AT 10:28 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........20 NNE AT 10:28 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........20 NE AT 10:21 A.M. AVERAGE............ 11.4 NE ASOS................11.4 DAVIS...............11.4 N [360 deg] 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 SEPT..............3.13 DEPARTURE.......+0.68 ASOS..............3.15 TOTAL PRECIPITATION FOR THE YEAR..........38.59 DEPARTURE.......+2.67 ASOS.............41.15 # # Includes erroneous ASOS precipitation data on 2/13/08. PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 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 9/1 81/57/69/+2/0.00/787/100 29 NW 9/2 74/60/67/+1/0.00/604/77 27 N 9/3 75/57/66/0/0.00/766/98 22 N 9/4 85/62/74/+8/0.00/748/96 23 SSW 9/5 86/67/77/+12/0.00/575/74 32 SSE 9/6 82/68/75/+10/1.88/039/05 44 SE Aero 39 MPH SE * 9/7 78/61/70/+5/0.31/655/85 43 NW Aero 43 MPH NW * 9/8 78/58/68/+3/0.00/753/98 23 WSW 9/9 73/60/67/+3/0.32/054/07 43 SW Aero 46 MPH SW TSTM # 9/10 68/52/60/-4/0.00/748/98 25 WNW 9/11 69/48/59/-5/0.00/616/81 23 S 9/12 66/54/60/-3/0.22/008/01 33 S 9/13 74/62/68/+5/T/113/15 21 S 9/14 70/64/67/+4/0.40/000/00 35 S 9/15 79/60/70/+8/0.00/697/93 45 WSW Aero 45 MPH WSW ** 9/16 64/54/59/-3/0.00/045/06 21 NNW 9/17 72/53/63/+1/0.00/.../.. 20 S Aero 17 MPH S 9/18 65/49/57/-4/0.00/.../.. 31 NNE Aero 28 MPH NNE 9/19 morning low temp. 47F; our normal low is now 52F * Tropical Storm Hanna # Thunderstorm gust ** Ike remnants NEW DAILY RECORDS FOR SEPTEMBER None to date.. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR SEPTEMBER 19 HIGH 87F IN 1906,1983 LOW 37F IN 1929 PRECIP 3.69 INCHES IN 1936 PEAK GUST 48 MPH NE IN 1972 RECORDS FOR SEPTEMBER 20 HIGH 90 IN 1983 LOW 34 IN 1979 PRE 4.57 INS IN 1899 WIND 44 MPH NE IN 1972 TODAY'S REPORT PREPARED By: Stephanie Radner