BLUE HILL METEOROLOGICAL OBSERVATORY, MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA ALL TIMES EASTERN DAYLIGHT TIME THURSDAY SEPTEMBER 15, 2005 TODAY'S DISCUSSION....2 P.M. THUNDERSTORM BRINGS TORRENTIAL DOWNPOURS THIS MORNING... 1.23 INCHES IN 30 MINUTES FROM 10:30 TO 11 A.M. SUNSHINE AT 90% THROUGH 14 DAYS....AMONG OUR SUNNIEST EXTENDED PERIODS ON RECORD.... It was our first rainfall since early on September 1st. A morning thunderstorm brought torrents of rain measuring 1.2 inches in 30 minutes and 1.4 inches in 45 minutes. An extended period of extremely sunny weather ended at two weeks! 90% of the possible sunshine occurred through September 1-14. TODAY'S OBSERVATIONS.... 8 A.M. low stratus overcast with 1 mile visibility in fog; temp; & dewpoint 70; wind south at 12 mph; six hourly rainfall trace; min. temp. 68 deg. BHO SA 1155 E3 OVC 1F 193/70/70/1910/010/ STRA DRFTNG OVR SMT VSBY N-NE 1/4 CDNS OCNL LWR/ 8/6// 53013 MANUAL 6000/ 10071 20068 11 A.M. low overcast with 1 mile visibility in thunderstorm, heavy rain and fog; lightning cloud to cloud, within cloud and cloud to ground sw through n; thunderstorm began at 10:15 a.m. sw-w moving northeast; temp/dewpoint 66; wind w at 12 mph gusting 23 mph; direction variable ssw to nnw; 3-hourly rainfall 1.23 ins. BHO SA 1455 E4 OVC 3/4TR+F 200/66/66/2710G20/012/ TB15 SW-N MOVG NE LTGCCICCG SW-N/ 8/7// 53007 MANUAL 6123/ ASOS N/A 2 P.M. low overcast stratus with higher clouds seen to the west; visibility 3/4 mile in fog; variable visibility 1/2 to 1 mile and higher northwest sun ocnly dimly visible; temp and dewpoint 70; wind ese at 06 mph; six hourly max. temp. 72; min. temp. 66; six hourly rainfall 1.60 ins. std gage and 1.64 ins. for ASOS. BHO SA 1755 E3 OVC 3/4VF 194/70/70/1205/010/ STRA DRFTG OVR/BLO SMT HIER CLDS VSB SW-NW SUN OCNL DMLY VSB VSBY OCNL SML BINOVC PST HR VSBY 1/2V1 N 1/4 NW BRFLY 6 CDNS VRBL RE05B20E35B45E50/ 8/6// 56008 ASOS 60164 MANUAL 6160/ 10072 20066 WEATHER SUMMARY FOR WEDNESDAY SEPT 14: TEMPERATURE (DEGREES F) MAX......85 NORMAL.....72 HAZEN 85.0 AT 2:31 P.M. MIN......65 NORMAL.....54 HAZEN 65.0 AT 7:50 A.M. MEAN.....75 NORMAL.....63 DEPARTURE FROM 30-YEAR NORMAL.....+ 12 TOTAL DEPARTURE FOR THE MONTH.....+ 59 [4.0 deg. daily ] PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY......... 27 S AT 6:15 P.M. AEROVANE................................. 28 S AT 6:29 P.M. ASOS......................................... N/A DAVIS..........................................29 S AT 6:29 P.M. FASTEST MILE FOR YESTERDAY.................. 16 S AT 7:09 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............ N/A MAXIMUM 1-MINUTE DAVIS AVERAGE............ 21 S AT 6:31 P.M. AVERAGE WIND SPEED AND DIRECTION... .... 12.1 S ASOS............................................................. 13.0 S [170 deg] DAVIS............................................................. 12.4 S [170 deg] N/A = not available due no ASOS connection.... PRECIPITATION (INCHES) THROUGH THIS MORNING (EDT) TOTAL PRECIPITATION 24 HRS ENDING 8 A.M....trace DEPARTURE.....-0.14 ASOS.............. 0.00 TOTAL PRECIPITATION FOR SEPT...............0.41 DEPARTURE....-1.48 ASOS..............n/a TOTAL PRECIPITATION FOR THE YEAR..........39.50 DEPARTURE....+4.29 ASOS..............n/a N/A = not available due no ASOS connection... 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 morning low temp. 66 thru noon; rainfall 1.46 ins. thru noon... DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR SEPTEMBER 15 HIGH 89F IN 1931 LOW 35F IN 1913 PRECIP 3.93 INCHES IN 1904 (Extra-tropical storm making landfall in New England on 9/15/1904 passing east of BHO and bringing a storm total of 4.11 inches 9/14-15/1904) PEAK GUST 65e MPH NW IN 1944 (In the wake of Great Atlantic Hurricane) RECORDS FOR SEPTEMBER 16 HIGH 91F IN 1939,1941 LOW 39F IN 1984 PRECIP 5.12 INCHES IN 1933 (Hurricane) PEAK GUST 59 MPH SSE IN 1999 TODAY'S REPORT BY: Robert Skilling