BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, APRIL 22, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME MORE RAIN MOVING IN THIS AFTERNOON AFTER TOTAL OF 1.05 INCHES DURING PAST TWO DAYS Another area of rainfall was approaching us from the south and southwest today and arrived here just after 1:30 P.M. EDT as some sprinkles. The rain which began late Monday finally ended Tuesday evening after leaving a total of 1.05 inches here at the Observatory. Today's weather observations: 7 A.M. Weather: Scattered stratus, scattered cirrus and thin scattered cirrus Temperature: 51F, Dew point: 50F, Wind: S at 9 kts, Sea-level pressure: 29.75 inches Hg, falling Visibility: 20 miles, thin fog 6-hour minimum temperature: 50F 24-hour rainfall: 0.53 inch BHO SA 1155 6 SCT 250 SCT 300 –SCT 20 074/51/50/1909/975/ THN FG/ 8/601 5016 MANUAL 70053 ASOS 70056 10053 20050 10 A.M. Weather: Dense scattered cirrus, broken partly dense cirrus, few small cumulus forming except NE-SE, altocumulus distant WSW-NNW, dense ci extending over- head through south Temperature: 58F, Dew point: 48F, Wind: SSE at 7 kts, Wind: Direction variable ESE to SSW Sea-level pressure: 29.76 inches Hg, falling Visibility: 50 miles BHO SA 1455 200 SCT E220 BKN 250 OVC 50 077/58/48/1507/976/ OVC PTLY THN FEW CUFRA/SML CU FRMG XCPT NE-SE AC DSNT WSW-NW DENS CI OVHD-S WND 12V20/ 8/132 50003 1 P.M. Weather: Overcast nimbostratus with virga all quadrants, higher clouds visible W-N, few cumulus, stratocumulus to the west-southwest thru north, light rain shower occurring, precip. very light Temperature: 58F, Dew point: 46F, Wind: SE at 8 kts, Sea-level pressure: 29.67 inches Hg, falling Visibility: 50 miles, east thru south 20 miles, and northwest 70 miles 6-hourly max. temp: 62F 6-hourly rainfall: trace BHO SA 1755 E65 OVC 50RW- 046 58/46/1408/967/ FEW SC/CU WSW-N HIER CLDS VSBY W-N VIRGA ALQDS E-S 20 NW 70 RB35 PCPN VRY LGT/ 8/82/ 56032 MANUAL 6000/ 10062 20051 WEATHER SUMMARY FOR TUESDAY, APRIL 21, 2009 TEMPERATURE (DEGREES F) MAX.....58 NORMAL......58 MIN.....42 NORMAL......39 MEAN....50 NORMAL......48 DEPARTURE FROM 30-YEAR NORMAL..................+2 TOTAL DEPARTURE FOR THE MONTH.................+13 [+0.4 DEGREE/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............15 DEPARTURE........-2 TOTAL HEATING UNITS FOR THE MONTH............414 DEPARTURE.......-13 TOTAL HEATING UNITS FOR THE SEASON..........5832 DEPARTURE.......-59 TOTAL HEATING UNITS LAST SEASON TO DATE.....5510 DIFFERENCE.....+322 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............43 E AT 11:26 P.M. AEROVANE.............39 E AT 11:41 P.M. ASOS.................40 E AT 11:26 P.M. DAVIS................41 S AT 10:05 P.M. FASTEST MILE FOR YESTERDAY..............30 SSE AT 7:38 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...........29 SSE AT 7:37 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........30 E AT 12:01 A.M. AVERAGE..............16.2 SSE ASOS.................15.0 DAVIS................15.0 SE [130 deg] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M.....0.53 DEPARTURE.........+0.39 ASOS...............0.56 TOTAL PRECIPITATION FOR THE MONTH...........4.36 DEPARTURE.........+1.26 ASOS...............4.41 TOTAL PRECIPITATION FOR THE YEAR...........14.44 DEPARTURE.........-2.29 ASOS..............15.54 # # 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.........-2.0 TOTAL SNOWFALL FOR THE SEASON..............78.9 DEPARTURE........+19.8 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/-3/0/0/650/81 35 NE AERO 31 MPH NE 4/16 50/34/42/-4/0/0/806/100 29 NNE 4/17 69/35/52/+5/0/0/695/86 37 W AERO 33 MPH W 4/18 64/44/54/+7/0.05/0/170/21 28 W 4/19 52/38/45/-2/0.03/0/773/95 33 NNE AERO 28 MPH NNE 4/20 51/36/44/-4/0.07/0/.../... 43 E AERO 39 MPH E 4/21 58/42/50/+2/0.95/0/000/00 43 E AERO 43 MPH S 4/22 morning low temp: 50F, our normal low is now 39F 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 22 HIGH 85 IN 1977, 2001 LOW 26 IN 1981 PRECIP 1.85 IN. IN 2000 SNOWFALL 3.0 IN. IN 1940 PEAK GUST 68e MPH NW IN 1945 RECORDS FOR APRIL 23 HIGH 85 IN 1908, 2007 LOW 25 IN 1933,1989 PRECIP 1.51 IN. IN 1998 SNOWFALL 0.5 IN. IN 1911, 1956 PEAK GUST 64 MPH WNW IN 1962 TODAY'S REPORT PREPARED BY: Robert Skilling