BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, APRIL 8, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME MOSTLY CLOUDY AGAIN TODAY WITH COLD TEMPS. ALONG WITH COLD GUSTY SW WINDS Clouds have prevailed again today with only glimpses of the sun and it's a cold feeling early April day, wind gusty southwest winds, that's right southwest winds, usually a warmer wind direction! The high has made it only to 44F by early afternoon. There's lots of precipitation (virga) hanging from the clouds and mostly drying up in the dry air with relative humidity in the 40% range and dew points down near 20F and upper teens at times. Today's Observations: 7 A.M. Weather: Broken stratocumulus, broken cirrus, few lower cumulus forming Temperature: 35F, Dew point: 23F, Wind: SW at 12 kts Sea-level pressure: 29.57 inches Hg, rising Visibility: 50 miles 6-hour minimum temperature: 32F 24-hour precipitation: trace BHO SA 1155 E38 BKN 50 BKN 250 BKN 50 015/35/23/2312/957/ FEW LWR CU FRMG/ 8/801 53018 10035 20032 10 A.M. Weather: Overcast stratocumulus, occasional small break in overcast, virga distant E-SE Temperature: 38F, Dew point: 18F, Wind: SW at 17G26 kts, Wind: Peak wind gust from SW at 29 kts at 9:32 A.M., Wind: Directional variability from SSW-W Sea-level pressure: 29.59 inches Hg, rising Visibility: 75 miles BHO SA 1455 E45 OVC 75 020/38/18/2317G26/959/ OCNL SML BINOVC VIRGA DSNT E-SE PK WND 2329/32/ WND 20V27/ 8/5// 51005 1 P.M. Weather: Broken stratocumulus, few lower moderate cumulus, few altocumulus lenticular form E-S, and virga all quadrants Temperature: 42F, Dew point: 22F, Wind: SW at 16G26 kts, Wind: Peak wind gust 29 kts SW @ 12:31 P.M., Wind: Direction variable S to W Sea-level pressure: 29.59 inches Hg, steady Visibility: 70 miles 6-hourly precip: 0.00 6-hourly max. temp. 44F BHO SA 1755 E55 BKN 70 BKN 70 020/42/22/2316G26/959/ LWR MDT CU FEW ACSL E-S VIRGA ALQDS HVY W PK WND 2229/31/ WND 19V27/ 8/840 55000 10044 20035 WEATHER SUMMARY FOR TUESDAY APRIL 7, 2009 TEMPERATURE (DEGREES F) MAX.....50 NORMAL.....52 MIN.....34 NORMAL.....34 MEAN....42 NORMAL.....43 DEPARTURE FROM 30-YEAR NORMAL................. -1 TOTAL DEPARTURE FOR THE MONTH.................+22 [+2.9 DEGREE/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............23 DEPARTURE.........+1 TOTAL HEATING UNITS FOR THE MONTH............137 DEPARTURE........-22 TOTAL HEATING UNITS FOR THE SEASON..........5555 DEPARTURE........-68 TOTAL HEATING UNITS LAST SEASON TO DATE.....5300 DIFFERENCE......+255 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............36 WSW AT 1:50 P.M. * AEROVANE.............35 WSW AT 1:15 P.M. ASOS.................35 WSW AT 1:50 P.M. DAVIS................36 SW AT 11:44 A.M. FASTEST MILE FOR YESTERDAY..............28 WSW AT 1:50 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........28 W AT 1:52 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........28 W AT 1:52 P.M. AVERAGE............14.3 WSW ASOS...............13.8 DAVIS..............13.2 SW [230 deg] * last of several occurrences.... RECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....trace DEPARTURE.........-0.15 ASOS...............0.00 TOTAL PRECIPITATION FOR THE MONTH...........2.28 DEPARTURE.........+1.23 ASOS...............2.36 TOTAL PRECIPITATION FOR THE YEAR...........12.36 DEPARTURE.........-2.32 ASOS..............13.49 # # 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................0.0 DEPARTURE.........-0.8 TOTAL SNOWFALL FOR THE SEASON..............78.7 DEPARTURE........+21.0 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/.../.. 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/.../.. 36 WSW AERO 35 MPH WSW 4/8 morning low temp. 32F; our normal low is now 35F 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 8 HIGH 87 IN 1991 LOW 17 IN 1888 PRECIP 1.78 IN. IN 1956 SNOWFALL 9.3 IN. IN 1956 PEAK GUST 70 MPH S IN 2000 RECORDS FOR APRIL 9 HIGH 83 IN 1991 LOW 18 IN 1888 PRECIP 2.38 IN. IN 1935 SNOWFALL 11.0 IN. IN 1917 PEAK GUST 72 MPH WNW IN 1962 TODAY'S REPORT PREPARED BY: Robert Skilling