BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA ALL TIMES EASTERN DAYLIGHT TIME WEDNESDAY SEPTEMBER 21, 2005 TODAY'S DISCUSSION....2 P.M. Today is one of those rare days during the year when hardly a cloud can be seen here from the summit as we see up to 70 miles from the summit. It's absolutely a "top ten" kind of day with temperatures reaching the mid-70's and dew points down around 53 degrees all day. TODAY'S OBSERVATIONS.... 8 A.M. clear with 70 miles visibility; temp. 60; dewpoint 53; wind wsw at 12 mph; six hourly min. temp. 58; 24 hourly rainfall 0.05 in. 11 A.M. clear with 70 miles visibility; temp. 68; dewpoint 54; wind west at 13 mph... BHO SA 1455 CLR 70 181/68/54/2611/006/ 51009 2 P.M. clear with just a few cu nw-n visibility continues at 70 miles; temp. 75; dewpoint 53; wind wsw 14 mph but variable sw to w; 6 hourly max. temp. 75 deg. BHO SA 1755 CLR 70 174/75/53/2412/004/ FEW CUFRA/CU FRMG NW-N WND 22V28/ 8/100 58007 10075 20060 WEATHER SUMMARY FOR TUESDAY SEPT 20: TEMPERATURE (DEGREES F) MAX......73 NORMAL.....70 HAZEN 73.2 AT 5:09 P.M. MIN......62 NORMAL.....52 HAZEN 62.0 AT 3:18 A.M. MEAN.....68 NORMAL.....61 DEPARTURE FROM 30-YEAR NORMAL.....+ 7 TOTAL DEPARTURE FOR THE MONTH.....+ 91 [4.4 deg. daily ] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY......... 35 W AT 9:20 P.M. AEROVANE.............................. 38 W AT 9:20 P.M. ASOS...................................... 33 W AT 9:20 P.M. DAVIS.......................................35 S AT 4:40 P.M. FASTEST MILE FOR YESTERDAY.................. 23 SSW AT 5:02 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............ 26 SSW AT 5:02 P.M. MAXIMUM 1-MINUTE DAVIS AVERAGE............ 28 S AT 5:02 P.M. AVERAGE WIND SPEED AND DIRECTION... .... 16.3 S ASOS............................................................. 16.6 S [190 deg] DAVIS............................................................. 16.6 S [190 deg] There are several corrections to ASOS precipitation data below... Now that our direct connection to the ASOS CPU was restored this morning... PRECIPITATION (INCHES) THROUGH THIS MORNING (EDT) TOTAL PRECIPITATION 24 HRS ENDING 8 A.M....0.05 DEPARTURE.....-0.09 ASOS.............. 0.05 TOTAL PRECIPITATION FOR SEPT...............3.08 DEPARTURE....+0.35 ASOS...............3.08 [corrected] TOTAL PRECIPITATION FOR THE YEAR..........42.17 DEPARTURE....+6.12 ASOS..............40.93 [corrected] PRELIMINARY CLIMATE SUMMARY FOR SEPTEMBER 2005......CALENDAR DAY DATA DATA REPORTED: DATE MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 9/1 81/73/73/+6/0.41/773/98 28 WNW 9/2 83/62/73/+7/0/786/100 23 WSW 9/3 78/61/70/+4/0/782/100 25 WNW 9/4 78/60/69/+3/0/725/93 21 NE 9/5 70/57/64/-1/0/770/99 24 NNE 9/6 74/56/65/0/775/100 16 S 9/7 81/57/69/+4/0/742/96 21 S 9/8 83/59/71/+6/0/670/87 20 SSW 9/9 70/60/65/+1/0/276/36 21 NW 9/10 71/53/62/-2/0/756/99 21 NNW 9/11 73/49/61/-3/0/709/93 28 SSW 9/12 88/60/74/+11/0/691/91 29 SW 9/13 81/66/74/+11/0/688/91 23 SSE 9/14 85/65/75/+12/0/550/73 27 S 9/15 72/66/69/+7/2.43/000/00 23 WNW TSTM 9/16 68/62/65/+3/N/A/000/00 24 NNE 9/17 67/61/64/+2/N/A/000/00 22 ENE 9/18 74/60/67/+6/0/186/25 17 W 9/19 79/57/68/+7/0/.../.. 17 W 9/20 73/62/68/+7/0.05/000/00 35 W TSTM Aero 38 MPH W 9/21 morning low temp. 58 deg; normal now 51 deg. 24 hourly precip. total 0.05 inch... DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR SEPTEMBER 21 HIGH 91 IN 1895 LOW 35 IN 1929, 1956, 1962 PRE 5.58 INS IN 1961 (HURRICANE ESTHER; RETURNED AS TS SEPT 25-26TH) WIND 186 MPH S IN 1938 (GREAT NEW ENGLAND HURRICANE; CALCULATED GUST, STATION RECORD) RECORDS FOR SEPTEMBER 22 HIGH 90F IN 1895, 1914 LOW 30F IN 1904 (Earliest freeze) PRECIP 1.16 INCHES IN 2001 PEAK GUST 60 MPH SSW IN 1989 TODAY'S REPORT BY: Robert Skilling