BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SUNDAY, APRIL 19, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME VERY SMALL AMOUNTS OF RAINFALL OVERNIGHT TOTALED JUST 0.08 INCH BUT WAS OUR FIRST RAINFALL IN A WEEK Sprinkles of rain left only a trace during Saturday afternoon and light showers during the evening and very early hours of today brought only a few hundredths of an inch. The showers did very little to ease the dry conditions which have developed over the past week or since the last significant rainfall back on April 11th. Today's weather observations: 7 A.M. Weather: Scattered dense cirrostratus layer ESE-W, thin broken cirrus, few small cumulus forming distant in the southeast, altocumulus distant SE-SW Temperature: 44F, Dew point: 32F, Wind: NNE at 14G26 kts, Wind: Peak wind gust 29 kts NNE at 6:33 A.M., Wind: Direction variable NNW to ENE, Wind: Direction gradually veering Sea-level pressure: 30.06 inches Hg, rising Visibility: 60 miles 6-hour minimum temperature: 41F 6-hour precipitation: trace 24-hour precipitation: 0.08 inch BHO SA 1155 220 SCT 250 SCT 300 –BKN 60 179/44/32/0214G26/006/ FEW SML CU FRMG DSNT SE AC DSNT SE-WSW DENS CS LYR AT 220 XTDNG ESE-W MSTLY CLR SKY NW-NW PK WND 0229/33 WND 34V06 WND GRDLY VEERING PST HR/ 8/148 53020 MANUAL 6000/ ASOS 70006 MANUAL 70008 10044 20041 10 A.M. Weather: High thin scattered cirrus clouds, lower cirrus to the south-southeast thru west Temperature: 48F, Dew point: 26F, Wind: NE at 13G21 kts, Wind: Peak wind gust 26 kts NNE at 9:12 A.M. Wind: Direction variable NNW to E Sea-level pressure: 30.13 inches Hg, rising Visibility: 70 miles BHO SA 1455 300 –SCT 70 202/48/26/0413G21/013/ LWR CI SSE-W PK WND 0226/12 WND 34V09/ 8/001 51023 WEATHER SUMMARY FOR SATURDAY, APRIL 18, 2009 TEMPERATURE (DEGREES F) MAX.....64 NORMAL......56 MIN.....44 NORMAL......38 MEAN....54 NORMAL......47 DEPARTURE FROM 30-YEAR NORMAL..................+7 TOTAL DEPARTURE FOR THE MONTH.................+17 [+0.7 DEGREE/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............11 DEPARTURE........-7 TOTAL HEATING UNITS FOR THE MONTH............358 DEPARTURE.......-17 TOTAL HEATING UNITS FOR THE SEASON..........5776 DEPARTURE.......-63 TOTAL HEATING UNITS LAST SEASON TO DATE.....5479 DIFFERENCE.....+297 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............28 W AT 12:05 A.M. AEROVANE.............24 W AT 12:05 A.M. ASOS.................24 W AT 12:29 A.M. DAVIS................26 W AT N/A FASTEST MILE FOR YESTERDAY..............19 W AT 12:08 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........N/A MAXIMUM 2-MINUTE DAVIS AVERAGE..........20 W AT N/A AVERAGE..............9.3 W ASOS.................8.8 DAVIS................9.7 WNW [290 deg] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.08 DEPARTURE.........-0.06 ASOS...............0.06 TOTAL PRECIPITATION FOR THE MONTH...........3.31 DEPARTURE.........+0.63 ASOS...............3.34 TOTAL PRECIPITATION FOR THE YEAR...........13.39 DEPARTURE.........-2.92 ASOS..............14.47 # # 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.........-1.7 TOTAL SNOWFALL FOR THE SEASON..............78.9 DEPARTURE........+20.1 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 MPH N 4/12 43/29/36/-9/0/0/541/68 45 NW AERO 43 MPH WNW 4/13 52/29/41/-4/0/0/734/92 38 W AERO 35 MPH W 4/14 58/37/48/+2/0/0/696/87 25 E 4/15 49/36/43/-3/0/0/.../.. 35 NE AERO 31 MPH NE 4/16 50/34/42/-4/0/0/.../.. 29 NNE 4/17 69/35/52/+5/0/0/.../.. 37 W AERO 33 MPH W 4/18 64/44/54/+7/0.05/0/.../.. 28 W 4/19 morning low temp: 41F; our normal low is now 38F 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 19 HIGH 94 IN 1976 [RECORD FOR MONTH] LOW 21 IN 1890 PRECIP 1.71 IN 1969 SNOWFALL 6.0 IN. IN 1887 PEAK GUST 66 MPH E IN 1984 RECORDS FOR APRIL 20 HIGH 88 IN 1927 LOW 18 IN 1897 PRECIP 1.14 IN 1972 SNOWFALL 2.5 IN. IN 1904, 1972 PEAK GUST 76 MPH WNW IN 1963 TODAY'S REPORT PREPARED BY: Robert Skilling