BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, APRIL 7, 2007 ALL TIMES ARE IN EASTERN STANDARD TIME MOSTLY CLOUDY AND COOL AGAIN TODAY... Early morning sunshine has been replaced with a veil of cirrostratus this afternoon as a developing storm offshore pushes some high level moisture into eastern New England. It will be another cool day, with a high of only 40 so far as of 2 PM EST. The April mean temperature has now dropped to about 6 degrees cooler than average per day. Today's observations: 7 A.M. Weather: Thin broken cirrus, few altocumulus Temperature: 29F, Dew point: 15F, Wind: WNW at 6 kts Sea-level pressure: 29.71 inches Hg, falling Visibility: 55 miles 6-hour min. temp: 26F BHO SA 1155 250 –BKN 55 061/29/15/3006/971/ FEW LWR CI E-SE FEW AC DSNT W-N WND LGT/ 8/031 58003 10030 20026 10 A.M. Weather: Scattered cumulus, scattered cirrus Temperature: 35F, Dew point: 17F, Wind: W at 7 kts Sea-level pressure: 29.66 inches Hg, falling Visibility: 60 miles BHO SA 1455 40 SCT 250 SCT 60 044/35/17/2807/966/ WND LGT AND VRB/ 8/101 58017 1 P.M. Weather: Scattered cumulus, scattered altocumulus, and overcast cirrostratus, sun visible through clouds Temperature: 39F, Dew point: 15F, Wind: WNW at 5 kts Sea-level pressure: 29.56 inches Hg, falling Visibility: 75 miles 6 hour max. temp. 40F BHO SA 1755 45 SCT 110 SCT 140 OVC 75 010/39/15/3005/956/ THN SPTS IOVC DSNT WNW-N SUN VSBL WND LGT AND VRB/ 8/177 56034 10040 20029 WEATHER SUMMARY FOR FRIDAY, APRIL 6 TEMPERATURE (DEGREES F) MAX.....39 NORMAL.....52 MIN.....23 NORMAL.....34 MEAN....31 NORMAL.....43 DEPARTURE FROM 30-YEAR NORMAL..........-12 TOTAL DEPARTURE FOR THE MONTH..........-33 (-5.7 DEGREES/DAY) HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY..........34 DEPARTURE........+12 TOTAL HEATING UNITS FOR THE MONTH.........170 DEPARTURE........+33 TOTAL HEATING UNITS FOR THE SEASON.......5164 DEPARTURE.......-437 TOTAL HEATING UNITS LAST SEASON TO DATE..5063 DIFFERENCE......+101 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............36 WSW AT 2:53 A.M. AEROVANE............ 33 WSW AT 1:25 P.M. ASOS.................33 WSW AT 1:25 P.M. DAVIS................34 WSW AT 3:27 A.M. FASTEST MILE FOR YESTERDAY..............26 WSW AT 2:34 P.M.* MAXIMUM 2-MINUTE ASOS AVERAGE...........25 W AT 2:35 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........28 W AT 3:18 P.M. AVERAGE WIND SPEED AND DIRECTION......15.6 WSW ASOS..............15.4 DAVIS.............16.0 WSW [251 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..........1.90 DEPARTURE.....+1.00 ASOS..............1.79 TOTAL PRECIPITATION FOR THE YEAR..........13.64 DEPARTURE.....-0.89 ASOS.............13.43 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......-0.5 TOTAL SNOWFALL FOR THE SEASON..............27.6 DEPARTURE.....-30.0 PRELIMINARY CLIMATE SUMMARY FOR APRIL 2007......CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available 4/1 59/33/46/+5/0.42/0/511/67 30 S 4/2 39/35/37/-5/0.33/0/000/00 27 E 4/3 41/32/37/-5/0.04/0/000/00 28 ENE 4/4 36/32/34/-8/0.90/0.2/000/00 38 E 4/5 43/26/35/-8/0.21/T/.../.. 36 WSW 4/6 39/23/31/-12/0/0/.../.. 36 WSW 4/7 morning low temp. 26 deg; normal now 34 deg. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 7 HIGH 86 IN 1929 LOW 13 IN 1982 PRECIP 1.72 IN. IN 1924 SNOWFALL 4.5 IN. IN 1967, 1996 PEAK GUST 65 MPH WNW IN 1982 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 TODAY'S REPORT By: Mike Iacono