BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY SEPTEMBER 24, 2004 ALL TIMES ARE IN EASTERN DAYLIGHT TIME TODAY'S DISCUSSION...11 A.M. Morning fog in the lower elevations allowed for a rare, but spectacular full undercast this morning. While locations at the bottom of the hill were under gray skies with dense fog, we had clear skies on the summit with full sunshine before the undercast eventually lifted obscuring us in the clouds for a time. Visibility at 8 A.M. was 15 miles to the southwest through northwest above the undercast, but only 2 to 3 miles to the east as the cloud tops rose to about the elevation of the summit. By late morning we have some leftover fog and low clouds mostly to the south and southwest, but improving conditions elsewhere with surface visibility up to around 15 miles to the northeast through east, but still only around 3 miles to the south through southwest. Winds have been very light so far this morning with an extended period of calm winds from just before 7am right through 10:30am, rare for here on the hill! TODAY'S OBSERVATIONS: 8 a.m. BHO SA 1155 /// OVC 6 SCT 250 -SCT 6F 263/58/56/0000/031/ COMPLETE UNDERCAST ALQDS VSBY 15 SW-NW ABOVE UNDERCAST 2 NE-SE/ 8/501 53014 10059 20055 11 a.m. BHO SA 1455 E8 BKN 15 BKN 250 -BKN 9 260/62/57/2303/030/ VSBY 3 S-WSW 15 NE-E WND L/V/ 8/501 53003 ALL TIMES EASTERN DAYLIGHT TIME.. WEATHER SUMMARY FOR THURSDAY, SEPTEMBER 23: TEMPERATURE (DEGREES F) MAX.... 73 NORMAL.....69 HAZEN SHELTER 73.0 @ 10:36 A.M. MIN.....58 NORMAL.....51 HAZEN SHELTER 58.0 @ 11:50 P.M. EST MEAN....66 NORMAL.....60 DEPARTURE FROM 30-YEAR NORMAL.....+ 6 TOTAL DEPARTURE FOR THE MONTH.....+ 22 (+0.7 DEGREES/DAY) PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY........27 ENE AT 12:01 P.M. AEROVANE.........28 ENE AT 12:01 P.M. ASOS.............25 ENE AT 12:00 P.M. DAVIS............26 NNW AT 4:45 A.M. FASTEST MILE FOR YESTERDAY..........19 ENE AT 12:00 P.M. HIGHEST ASOS 2 MIN AV...20 ENE AT 11:58 A.M. HIGHEST DAVIS 1 MIN AV...20 NNW AT n/a AVERAGE WIND SPEED AND DIRECTION.. 9.8 NW ASOS........... 10.1 WNW / 300 deg. DAVIS.......... 10.0 NNE/ 015 deg. PRECIPITATION (INCHES) TOTAL PRECIPITATION 24 HRS ENDING 8 A.M....0.00 DEPARTURE....-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........4.86 DEPARTURE....+1.71 ASOS..............4.88 TOTAL PRECIPITATION FOR THE YEAR..........38.41 DEPARTURE....+1.79 ASOS.............36.76 PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2004......CALENDAR DAY DATA DATA REPORTED: 24 HOUR PERIODS ENDING MIDNIGHT EST DATE MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST ... SUNSHINE DATA NOT YET AVAILABLE 9/1 78/60/69/+2/0/763/97 21 MPH WNW 9/2 72/56/64/-2/0/722/92 23 MPH S 9/3 79/57/68/+2/0/743/95 25 MPH SSW 9/4 82/58/70/+4/0/553/71 29 MPH ENE Aero 30 MPH ENE 9/5 67/52/60/-5/0/513/66 25 MPH ENE 9/6 72/51/62/-3/0/720/93 18 MPH SSE LABOR DAY 9/7 80/58/69/+4/0/424/55 24 MPH SSE 9/8 74/63/69/+4/0.79/008/01 23 MPH NE 9/9 80/63/72/+8/0.75/115/15 45 MPH S Aero 51 MPH S Remnants of Frances 9/10 74/56/65/+1/T/610/80 36 MPH WNW Aero 40 MPH NW 9/11 69/55/62/-2/0/456/60 18 MPH NE 9/12 76/53/65/+2/0/719/95 18 MPH SW 9/13 76/57/67/+4/0/513/68 18 MPH NNW 9/14 64/52/58/-5/0/699/93 18 MPH SSE 9/15 69/51/60/-2/0.01/367/49 20 MPH S 9/16 70/60/65/+3/0.09/000/00 20 MPH SSW 9/17 78/65/72/+10/0/134/18 23 MPH SSW 9/18 67/53/59/-2/3.22/000/00 46 MPH NE Aero 48 MPH NE Remnants of Ivan 9/19 59/43/51/-10/0/685/93 37 MPH NNW Aero 40 MPH NNW 9/20 67/43/55/-6/0/690/94 23 MPH NNW 9/21 68/53/61/+1/0/344/47 20 MPH S 9/22 78/57/68/+8/0/678/93 25 MPH NNW Aero 29 MPH NNW 9/23 73/58/66/+6/0/.../.. 27 MPH ENE 9/24 Morning low 55 degrees. OUR DAILY EXTREMES.... Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR SEPTEMBER 24 HIGH 87F IN 1959 LOW 33F IN 1885,1950,1963 PRECIP 1.19 INCHES IN 1955 PEAK GUST 54e MPH SW IN 1940 RECORDS FOR SEPTEMBER 25 HIGH 87F IN 1970 LOW 31F IN 1950 PRECIP 2.68 INCHES IN 1961 PEAK GUST 63 MPH SSW IN 1991 Today's report: Matt Douglas