BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, APRIL 13, 2004 ALL TIMES ARE IN EASTERN STANDARD TIME [unless otherwise noted] TODAY'S OBSERVATIONS.... Rainfall totals almost 3/4 inch by early this afternoon with obscured sky by fog and light rain and fog and the temperature being held to the upper 30's. 4/13/2004 TUE 8 a.m. EDT obscurement at 100 ft; visibility 1/16 mile in light rain and dense fog; temp 37; wind ene at 25 gusting 36 mph... 24 hour rainfall 0.40 inch BHO SA COR 1155 W1 X 1/16R-F 207/37/37/0622G31/014/ R- INTMT PK WND 0636/22/ WND 03V09/ 8//// 58005 ASOS 60025 MANUAL 70040 ASOS 70036 10038 20037 11 a.m. EDT obscurement at 100 ft; visibility 1/16 mile in light rain and dense fog; temp. 38; wind nne at 16 gusting 24 mph.... three hour rainfall 0.11 inch BHO SA 1455 W1 X 1/16R-F 193/38/38/0314G21/010/ R- OCNL R WND 36V06 WND GRDLY BACKING/ 8//// 56014 ASOS 60010 MANUAL 6011/ 2 p.m. EDT obscurement at 300 ft; visibility 1/16 variable to 1/8 mile in light rain, light drizzle and dense fog and 38 deg; wind nne at 16 gusts 24 mph; six hour maximum temperature 39 deg; six hour precipitation total 0.31 inch period of modt. rain past hour.... BHO SA 1755 W3 X 1/16VR-L-F 174/38/38/0214G20/004/ VSBY 1/16V1/8 LB UKN R PST HR/ 8//// 56019 ASOS 60030 MANUAL 6031/ 10039 20037 WEATHER SUMMARY FOR MONDAY, APRIL 12: TEMPERATURE (DEGREES F) MAX.....47 NORMAL.....54 ASOS.....47.2 AT 1:35 P.M. MIN.....36 NORMAL.....36 ASOS.....36.0 AT 6:20 A.M. MEAN....42 NORMAL.....45 DEPARTURE FROM 30-YEAR NORMAL.....-3 TOTAL DEPARTURE FOR THE MONTH....-21 (-2.0 DEGREES/DAY) HEATING DEGREE DAYS TOTAL HEATING DEGREE DAYS FOR YESTERDAY.......23 DEPARTURE.....+3 TOTAL HEATING DEGREE DAYS FOR THE MONTH......283 DEPARTURE....+21 TOTAL HEATING DEGREE DAYS FOR THE SEASON....5775 DEPARTURE....+49 TOTAL HEATING DEGREE DAYS FOR LAST SEASON...6168 DIFFERENCE..-393 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY........30 ENE AT 11:03 P.M. AEROVANE.........30 ENE AT 11:03 P.M. ASOS.............26 ENE AT 11:03 P.M. FASTEST MILE FOR YESTERDAY..........20 ENE AT 11:04 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.......22 ENE AT 11:13 A.M. AVERAGE WIND SPEED AND DIRECTION....12.4 NE ASOS.......... 11.9 PRECIPITATION (INCHES) THROUGH THIS MORNING TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.40 ASOS..............0.36 TOTAL PRECIPITATION FOR THE MONTH..........4.48 DEPARTURE....+2.53 ASOS..............4.20 TOTAL PRECIPITATION FOR THE YEAR..........12.15 DEPARTURE....-3.13 ASOS.............11.08 SNOWFALL (INCHES) THROUGH THIS MORNING TOTAL SNOWFALL FOR 24 HRS ENDING 7 A.M......0.0 DEPARTURE....-0.1 TOTAL SNOWFALL FOR THE MONTH................0.5 DEPARTURE....-1.3 TOTAL SNOWFALL FOR THE SEASON..............58.0 DEPARTURE....+3.8 PRELIMINARY CLIMATE SUMMARY FOR APRIL 2004......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 4/1 41/36/39/-2/3.47/0/000/00 44 MPH NE 4/2 37/36/36/-5/0.30/0/000/00 41 MPH NE 4/3 38/35/37/-5/0/0/0/000/00 25 MPH NE 4/4 47/35/41/-1/0.22/0/008/01 32 MPH NW 4/5 40/27/34/-9/0.09/0.5/178/23 45 MPH NW Aerovane 46 MPH NW 4/6 49/26/38/-5/0/0/747/96 52 MPH WNW Aerovane 56 MPH WNW 4/7 55/32/44/+1/0/0/530/68 31 MPH WSW 4/8 58/32/45/+1/0/0/.../.. 25 MPH S 4/9 60/39/50/+6/T/0/.../.. 32 MPH W 4/10 57/34/46/+2/0/0/.../.. 40 MPH W 4/11 51/36/44/-1/0/0/.../.. 21 MPH W 4/12 47/36/42/-3/N/A/0/.../.. 30 MPH ENE THE NEW APRIL RECORDS.... There are THREE NEW APRIL RECORDS which have been established thus far this month. April 1 - Rainfall 3.47 inches for calendar day; previous record was 2.28 inches in 1962. April record - New greatest daily rainfall 3.47 inches for any date during April occurred on April 1; previous record 3.18 inches on April 21, 1991. April record - New greatest rainfall in "any" twenty-four hour period during April of 3.47 inches occurred on April 1. The previous record was 3.19 inches on April 20-21, 1991. THE DAILY APRIL RECORDS.... RECORDS FOR APRIL 13 HIGH 85 IN 1945 LOW 22 IN 1939 PRECIP 1.95 INCHES IN 1933 SNOWFALL 6.8 INCHES IN 1933 PEAK GUST 59 MPH SSW IN 1995 RECORDS FOR APRIL 14 HIGH 80 IN 1945 LOW 21 IN 1923 PRECIP 2.22 INCHES IN 1895 SNOWFALL 8.4 INCHES IN 1953 PEAK GUST 71e MPH W IN 1943 TODAY'S REPORT BY: Robert Skilling