BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, APRIL 10, 2008 ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED DENSE FOG CLEARED AWAY THIS MORNING THEN BRIGHT SUNSHINE AND WSW WINDS BROUGHT MUCH WARMER AIR WITH TEMPERATURE RISING THROUGH THE 60'S BY LATE THIS MORNING Some long-awaited warm spring weather finally arrived after a rather cool April to date. Temperatures averaged a degree cooler than normal during the first 9 days. Very dense early morning fog reduced the visibility to zero before 8 a.m. but cleared away rapidly allowing plenty of bright sunshine and rapidly rising temperatures late this morning. Winds gradually veered from south early today to the southwest and west by late morning. Our high temperature had reached near 70 degrees with relative of 23% early this afternoon. Today's observations: 8 A.M. EDT Weather: Obscurement with heavy fog, heavy dew Temperature: 48F, Dew point: 48F Wind: SSW at 9 kts Sea-level pressure: 30.10 inches Hg, falling slightly Visibility: zero variable to 1/16 mile, heavy fog 6-hour min temp: 44F 6-hour precip: trace BHO SA 1155 W1 X 0VF 192/48/48/2009/010/ VSBY 0V1/16/ HVY DEW/ 8//// 53001 MANUAL 6000/ 10048 20044 11 A.M. EDT Weather: Clear, high cirrus clouds Temperature: 61F, Dew point: 40F, Wind: WSW at 15G24 kts Wind: Variable in direction SSW to W Sea-level pressure: 30.06 inches Hg, falling Visibility: 45 miles, light haze BHO SA 1455 CLR 45 181/61/40/2515G24/006/ FEW CI LGT HZ WND 21V27/ 8/001 58011 2 P.M. EDT Weather: Thin scattered cirrus, cirrostratus, cirrostratus layer S-W Temperature: 68F, Dew point: 30F, Wind: W at 19G29 kts Wind: Peak wind gust 30 kts WSW @ 27 past the hour, Wind: variable in direction SW to WNW Sea-level pressure: 30.02 inches Hg, falling Visibility: 60 miles 6-hourly max.temp: 69F BHO SA 1755 300 -SCT 60 166/68/30/2619G29/002/ CS LYR S-W FEW CC NW PK WND 2530/27/ 8/005 56015 10069 20048 WEATHER SUMMARY FOR WEDNESDAY, APRIL 9 TEMPERATURE (DEGREES F) MAX.....59 NORMAL.....53 MIN.....33 NORMAL.....35 MEAN....46 NORMAL.....44 DEPARTURE FROM 30-YEAR NORMAL...........+2 TOTAL DEPARTURE FOR THE MONTH...........-7 [-1.0 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............19 DEPARTURE........-2 TOTAL HEATING UNITS FOR THE MONTH...........208 DEPARTURE........+7 TOTAL HEATING UNITS FOR THE SEASON.........5345 DEPARTURE......-320 TOTAL HEATING UNITS LAST SEASON TO DATE....5253 DIFFERENCE......+91 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............29 S AT 10:41 P.M. AEROVANE.............28 S AT 10:41 P.M. ASOS.................28 SSE AT 6:43 P.M. DAVIS................30 SSE AT 6:42 P.M. FASTEST MILE FOR YESTERDAY............. 21 SSE AT 7:43 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...........21 SSE AT 8:55 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........23 SSE AT 6:54 P.M. AVERAGE WIND SPEED AND DIRECTION........9.6 SSE ASOS.................9.3 DAVIS................8.9 SSE [150 deg] * last of several occurrences... PRECIPITATION (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..........1.06 DEPARTURE......-0.29 ASOS..............1.15 TOTAL PRECIPITATION FOR THE YEAR..........18.66 DEPARTURE......+3.68 ASOS.............21.03 # Includes erroneous ASOS precipitation data on 2/13/08. SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M...........0.0 DEPARTURE.....-0.1 TOTAL SNOWFALL FOR APRIL.....................0.0 DEPARTURE.....-1.0 TOTAL SNOWFALL FOR THE SEASON...............66.5 DEPARTURE.....+8.6 PRELIMINARY CLIMATE SUMMARY FOR APRIL 2008 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available, records not finalized 4/1 59/50/55/+14/0.20/0/000/00 54 S Aero 58 MPH SSW 4/2 47/31/39/-3/0/0/745/97 52 W Aero 51 MPH W 4/3 52/27/40/-2/0/0/648/84 37 SSW 4/4 43/34/39/-3/.../0/000/00 35 E 4/5 51/37/44/+1/.../0/000/00 21 W 4/6 40/36/38/-5/0.09/0/093/12 36 NE 4/7 39/34/37/-6/0/0/172/22 35 NE Aero 36 MPH NE 4/8 47/30/39/-5/0/0/627/80 22 NE 4/9 59/33/47/+3/0/0/.../.. 29 S 4/10 morning low temp. 44F; normal low is now 35F NEW DAILY RECORDS FOR APRIL 2008 None to date. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 10 HIGH 83 IN 1922 LOW 20 IN 1985 PRECIP 2.40 IN. IN 1935 SNOWFALL 10.1 IN. IN 1996 PEAK GUST 66 MPH WNW IN 1967 RECORDS FOR APRIL 11 HIGH 78 IN 1945 LOW 19 IN 1909 PRECIP 1.72 IN. IN 2003 SNOWFALL 9.5 IN. IN 1958 PEAK GUST 65 MPH NW IN 1963 TODAY'S REPORT PREPARED By: Robert Skilling