BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, SEPTEMBER 28, 2006 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Clear Temperature: 58F, Dew point: 52F, Wind: SE at 9 kts Sea-level pressure: 29.99 inches Hg, rising Visibility: 25 miles 6-hourly min. temp. 54 deg. 24-hourly precip. 0.00 in. BHO SA 1155 CLR 25 156/58/52/1309/999/ FEW CI W-N PTCHY GF BLO SMT/ 8/001 53005 10058 20054 10 A.M. Weather: Scattered cirrus Temperature: 67F, Dew point: 50F, Wind: SE at 11 kts Sea-level pressure: 29.98 inches Hg, falling Visibility: 30 miles BHO SA 1455 250 –SCT 30 152/67/50/1311/998/ FEW CU FRMG ALQDS LGT HZ/ 8/101 58004 1 P.M. Weather: Scattered cumulus, altocumulus Temperature: 70F, Dew point: 52F, Wind: ESE at 8 kts Sea-level pressure: 29.93 inches Hg, falling Visibility: 30 miles BHO SA 1755 E45 BKN 30 135/70/52/1108/993/ FEW MDT CU LGT HZ/ 8/400 58017 10071 20058 WEATHER SUMMARY FOR WEDNESDAY, SEPTEMBER 27 TEMPERATURE (DEGREES F) MAX.....71 NORMAL.....67 MIN.....50 NORMAL.....49 MEAN....61 NORMAL.....58 DEPARTURE FROM 30-YEAR NORMAL.......+ 3 TOTAL DEPARTURE FOR THE MONTH.......+15 (+0.4 DEGREE/DAY) PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.........23 SSW AT 12:15 P.M. AEROVANE..........23 SSE AT 10:35 A.M. ASOS..............20 SSE AT 10:39 P.M. DAVIS.............24 SSW AT 12:14 P.M. FASTEST MILE FOR YESTERDAY...........16 SE AT 10:27 P.M. * MAXIMUM 2-MINUTE DAVIS AVERAGE.......19 S AT 12:16 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE........17 SSE AT 10:27 P.M. AVERAGE WIND SPEED AND DIRECTION....8.4 SSE ASOS.............9.2 n/a DAVIS............8.0 S [180 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..........1.77 DEPARTURE.....-1.94 ASOS..............1.73 TOTAL PRECIPITATION FOR THE YEAR..........45.33 DEPARTURE.....+8.14 ASOS.............44.85 PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2006......CALENDAR DAY DATA DATA REPORTED: DATE MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 9/1 68/57/63/-4/0/442/56 29 ENE 9/2 63/58/61/-5/T/000/00 ** 45 ENE Aero 42 MPH ENE TD ERNESTO 9/3 68/58/63/-3/0.44/000/00 39 E Aero 37 MPH E 9/4 73/56/65/-1/0/519/66 31 WSW Aero 30 MPH WSW 9/5 71/56/64/-1/0.11/168/22 18 W 9/6 73/59/66/+1/0/194/25 17 WSW 9/7 73/58/66/+1/0/723/94 17 S 9/8 78/59/69/+4/0/631/82 22 SW 9/9 82/61/72/+8/T/682/89 24 SSW 9/10 65/51/58/-6/0/497/65 27 NE 9/11 63/47/55/-9/0/731/96 32 NE 9/12 64/45/55/-8/0/735/97 28 NNE 9/13 64/48/56/-7/T/119/16 23 SSE 9/14 70/56/63/0/0.30/0/0 24 SSE 9/15 69/59/64/+2/T/210/28 23 NE 9/16 76/57/67/+5/0/583/78 18 N 9/17 79/58/69/+7/0/662/89 17 SE 9/18 80/59/70/+9/0/579/78 24 S 9/19 79/61/70/+9/0.77/525/71 30 S 9/20 70/53/62/+1/0.13/523/71 28 WSW Aero 30 MPH WNW 9/21 63/48/56/-4/0/711/97 30 WNW 9/22 68/47/58/-2/0/614/84 23 S 9/23 68/56/62/+2/T/000/00 42 S 9/24 79/61/70/+11/0.02/087/12 43 SSW Aero 43 MPH SSW 9/25 67/52/60/+1/0/310/43 28 W 9/26 69/51/60/+1/0/689/96 29 WSW 9/27 71/50/61/+3/0/.../.. 23 SSW 9/28 morning low temp. 54; normal now 49 deg. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR SEPTEMBER 28 HIGH 82F IN 1959 LOW 33F IN 1897,1947 PRECIP 1.53 INCHES IN 1956 PEAK GUST 69 MPH NE IN 1962 RECORDS FOR SEPTEMBER 29 HIGH 85F IN 1952 LOW 28F IN 1914 (SEPTEMBER MINIMUM RECORD) PRECIP 2.61 INCHES IN 1907 PEAK GUST 62 MPH S IN 2005 TODAY'S REPORT BY: Stephanie Radner