BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, OCTOBER 16, 2008 ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED Today's observations: 8 A.M. EDT Weather: Broken stratus fractus, overcast stratus, few lower stratus fractus drifting over/below summit, bright spots in overcast east Temperature: 56F, Dew point: 56F, Wind: SSE at 12 kt Sea-level pressure: 29.97 inches Hg, falling Visibility: 3 miles, fog 6-hourly minimum temperature: 54F 24-hourly rainfall: 0.00 inch BHO SA 1155 40 SCT E55 OVC 3F 149/56/56/1612/997/ FEW LWR STFRA DRFTG OVR/BLO SMT BRGHT SPTS IOVC E/ 8/6// 56009 10056 20054 11 A.M. EDT Weather: Broken altocumulus, overcast cirrostratus, few breaks in overcast Temperature: 64F, Dew point: 57F, Wind: S at 15G23 kt Wind: Direction variability SE-SW Sea-level pressure: 29.92 inches Hg, falling Visibility: 10 miles, hazy BHO SA 1455 E90 BKN 220 OVC 10 131/64/57/1715G23/992/ FEW BRKS IOVC HZY WND 13V22/ 8/037 58018 2 P.M. EDT Weather: Scattered altocumulus, overcast cirrostratus, few stratus, very light rain Temperature: 65F, Dew point: 57F, Wind: S at 12G23 kt Wind: Direction variability SE-SW Wind: Peak gust past hour 26 kts from S at 1:12 P.M. EDT Sea-level pressure: 29.83 inches Hg, falling Visibility: 15 miles, hazy 3-hourly rainfall: trace BHO SA 1755 110 SCT E200 OVC 15R- 103/65/57/1712G23/983/ FEW STRA HZY RB30 PCPN INTMT VRY LGT PK WND 1726/12 WND 13V22/ 8/637 58028 MANUAL 6000/ 10067 20056 WEATHER SUMMARY FOR WEDNESDAY, OCTOBER 15 TEMPERATURE (DEGREES F) MAX.....64 NORMAL.....61 MIN.....52 NORMAL.....43 MEAN....58 NORMAL.....52 DEPARTURE FROM 30-YEAR NORMAL.............+6 TOTAL DEPARTURE FOR THE MONTH............+26 (+1.5 DEGREES/DAY) PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............21 ENE AT 10:39 A.M. AEROVANE.............17 WNW AT 2:34 A.M. ASOS.................20 S AT 10:19 P.M. DAVIS................N/A FASTEST MILE FOR YESTERDAY..............14 S AT 10:26 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........14 SSW AT 10:26 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........N/A AVERAGE...............9.5 NE ASOS..................9.4 DAVIS.................9.8 NE [54 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 THE MONTH..........0.62 DEPARTURE.......-1.48 ASOS..............0.63 TOTAL PRECIPITATION FOR THE YEAR..........43.52 DEPARTURE.......+3.82 ASOS.............46.11 # # Includes erroneous ASOS precipitation data on 2/13/08. PRELIMINARY CLIMATE SUMMARY FOR OCTOBER 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 10/1 68/58/63/+6/0.49/120/17 38 SW TSTM # 10/2 62/46/54/-2/0.12/455/65 45 W 10/3 62/45/54/-2/T/376/54 44 SSW Aero 43 MPH SSW 10/4 61/40/51/-5/0.00/612/88 32 WSW 10/5 53/45/49/-6/T/000/00 18 WNW 10/6 58/39/49/-6/0.00/303/44 28 WNW 10/7 64/37/51/-4/0.00/687/100 23 WNW 10/8 69/43/56/+2/0.00/581/85 32 S Aero 30 MPH S 10/9 72/55/64/+10/0.02/510/75 33 WSW 10/10 69/53/61/+7/0.00/664/98 29 W 10/11 68/49/59/+6/0.00/668/99 20 NNW 10/12 67/47/57/+4/0.00/625/93 21 W 10/13 62/50/56/+4/0.00/308/46 20 NE 10/14 65/50/58/+6/0.00/.../.. 30 SSE 10/15 64/52/58/+6/0.00/.../.. 21 ENE Aero 17 MPH WNW 10/16 morning low temp. 54F; the normal low 43F # Thunderstorm gust NEW DAILY RECORDS FOR OCTOBER None... DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR OCTOBER 16 HIGH 86 IN 1897 LOW 28 IN 1886 PRECIP 2.82 INCHES IN 1974 SNOWFALL (NONE) PEAK GUST 68e MPH SSE IN 1954 (HURRICANE HAZEL) RECORDS FOR OCTOBER 17 HIGH 86F IN 1947 LOW 25F IN 1886 PRECIP 1.87 INCHES IN 1989 SNOWFALL TRACE IN 1970 PEAK GUST 55 MPH NE IN 1964 TODAY'S REPORT PREPARED By: Stephanie Radner