BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, APRIL 15, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's weather observations: 7 A.M. Weather: Broken cirrus, patches dense cirrus, few stratocumulus distant N-NE Temperature: 39F, Dew point: 30F, Wind: NNE at 14G24 kts, Wind: Direction variability NNW to E Sea-level pressure: 30.08 inches Hg, rising Visibility: 70 miles 6-hour minimum temperature: 36F BHO SA 1155 E200 BKN 250 BKN 70 187/39/30/0314G24/008/ FEW SC DSNT N-NE PTCHS DENS CI THN K LYR W-NW AND N-NE SUN OCNL VSB WND 34V08/ 8/502 51014 10039 20036 10 A.M. Weather: Scattered cirrus, lone cumulus NNE, few altocumulus lenticularis SE-SW, patches dense cirrus Temperature: 47F, Dew point: 28F, Wind: ENE at 14G24 kts, Wind: Direction variability NNW to ENE Sea-level pressure: 30.12 inches Hg, rising Visibility: 70 miles BHO SA 1455 250 SCT 70 201/47/28/0614G24/012/ LONE CU NNE FEW ACSL SE-SW PTCHS DENS CI WND 33V07/ 8/142 51014 1 P.M. Weather: Scattered cirrus, few altocumulus lenticularis SE Temperature: 48F, Dew point: 25F, Wind: NE at 11G28 kts, Wind: Peak gust past hour 30 kts NE at 12:06 P.M. Wind: Direction variability N-E Sea-level pressure: 30.12 inches Hg, falling Visibility: 70 miles 6-hourly max. temp: 49F BHO SA 1755 250 SCT 70 200/48/25/0511G28/012/ FEW ACSL SE PK WND 0530/06 WND 35V10/ 8/041 55001 10049 20039 WEATHER SUMMARY FOR TUESDAY, APRIL 14, 2009 TEMPERATURE (DEGREES F) MAX.....58 NORMAL......55 MIN.....37 NORMAL......37 MEAN....48 NORMAL......46 DEPARTURE FROM 30-YEAR NORMAL..................+2 TOTAL DEPARTURE FOR THE MONTH.................+12 [+0.7 DEGREE/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............17 DEPARTURE........-2 TOTAL HEATING UNITS FOR THE MONTH............289 DEPARTURE.......-12 TOTAL HEATING UNITS FOR THE SEASON..........5707 DEPARTURE.......-58 TOTAL HEATING UNITS LAST SEASON TO DATE.....5425 DIFFERENCE.....+282 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............25 E AT 3:17 P.M. AEROVANE.............20 E AT 3:17 P.M. * ASOS.................23 ESE AT 3:18 P.M. DAVIS................23 SE AT 4:45 P.M. FASTEST MILE FOR YESTERDAY..............17 ESE AT 4:45 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........16 ESE AT 3:35 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........17 ESE AT 3:46 P.M. AVERAGE.............7.8 ESE ASOS................7.2 DAVIS...............7.6 ESE [107 deg] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.00 DEPARTURE.........-0.15 ASOS...............0.00 TOTAL PRECIPITATION FOR THE MONTH...........3.23 DEPARTURE.........+1.13 ASOS...............3.28 TOTAL PRECIPITATION FOR THE YEAR...........13.31 DEPARTURE.........-2.42 ASOS..............14.41 # # Includes erroneous ASOS precipitation data on 1/1/09, 1/2/09 and 2/27/09. SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.........-0.1 TOTAL SNOWFALL FOR THE MONTH................0.2 DEPARTURE.........-1.3 TOTAL SNOWFALL FOR THE SEASON..............78.9 DEPARTURE........+20.5 PRELIMINARY CLIMATE SUMMARY FOR APRIL 2009 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/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 4/1 43/31/38/-3/0.13/0/015/02 24 SE 4/2 52/39/46/+4/0.02/0/000/00 20 SSE 4/3 58/45/52/+10/0.70//000/00 39 SSE AERO 38 MPH SSE TSTM 4/4 51/38/45/+3/0.01/0/015/02 48 WSW AERO 48 MPH WSW 4/5 58/37/48/+5/0/0/551/71 40 W AERO 37 MPH W 4/6 55/38/47/+4/1.42/0/047/006 42 SE AER0 40 MPH SE TSTM 4/7 50/34/42/-1/T/0/109/14 36 WSW AERO 35 MPH WSW 4/8 45/32/39/-5/0/0/149/19 33 SW AERO 31 MPH SW 4/9 60/34/47/+3/0/0/692/88 36 SSW AERO 33 MPH SSW 4/10 65/41/53/+9/0.18/0/544/69 37 SSW AERO 35 MPH SSW 4/11 44/33/39/-6/0.77/0.2/000/00 35 N AERO 30 N 4/12 43/29/36/-9/0/0/541/68 45 NW AERO 43 WNW 4/13 52/29/41/-4/0/0/734/92 38 W AERO 35 W 4/14 58/37/48/+2/0/0/696/87 25 E AERO 20 MPH E 4/15 morning low temp: 36F, our normal low is now 37F NEW DAILY RECORDS FOR APRIL 2009... None to date.. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 15 HIGH 81 IN 1896 LOW 23 IN 1943 PRECIP 1.75 IN. IN 2007 SNOWFALL 1.0 IN. IN 1916, 1962 PEAK GUST 66 MPH E IN 2007 RECORDS FOR APRIL 16 HIGH 87 IN 1896 LOW 23 IN 1943 PRECIP 2.45 IN. IN 1929 SNOWFALL 2.0 IN. IN 1904, 1962 PEAK GUST 73 MPH E IN 2007 TODAY'S REPORT PREPARED BY: Stephanie Radner