BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, APRIL 20, 2005 ALL TIMES EASTERN DAYLIGHT TIME UNLESS OTHERWISE NOTED TODAY'S DISCUSSION.....AT 2 P.M. VERY WARM AND DRY CONDITIONS TODAY... The mercury has reached a max of 86 degrees here thus far this afternoon, only 2 degrees shy of the record for today of 88 degrees. While the airmass is still dry, it's not as dry as it has been over the past few days. Dewpoint readings have been hanging in the low 40s yielding relative humidities of 20-25% here on the summit. The wonderful visibility seen in previous days is now gone today with visibility early this afternoon no more than 20-25 miles under hazy conditions. TODAY'S OBSERVATIONS 4/20/2005 WED 8 a.m. BHO SA 1155 E12 BKN 250 -BKN 25 099/64/37/2416/982/ ACC ALQDS HAZY/ 8/081 51003 10064 20057 11 a.m. BHO SA 1455 250 -BKN 20 089/80/43/2616G24/979/ HAZY/ 8/001 58010 2 p.m. BHO SA 1755 E55 BKN 250 -BKN 20 055/83/40/2319G26/969/ FEW MDT CU S-SW PK WND 2632/27/ HAZY/ 8/201 56034 10086 20064 WEATHER SUMMARY FOR TUESDAY APRIL 19: TEMPERATURE (DEGREES F) MAX.....78 NORMAL.....57 HAZEN 78.0 @ 3:35 p.m. MIN.....46 NORMAL.....38 HAZEN 46.0 @ 4:34 a.m. MEAN....62 NORMAL.....47 DEPARTURE FROM 30-YEAR NORMAL......+ 15 TOTAL DEPARTURE FOR THE MONTH......+ 81 (+4.1 DEGREES/DAY) PRECIPITATION (INCHES) THROUGH THIS MORNING TOTAL PRECIPITATION 24 HRS ENDING 8 A.M....0.00 DEPARTURE....-0.14 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........2.04 DEPARTURE....-0.78 ASOS..............2.04 TOTAL PRECIPITATION FOR THE YEAR..........18.50 DEPARTURE.....+2.20 TOTAL FOR ASOS FOR THE YEAR...............17.52 SNOWFALL (INCHES) THROUGH THIS MORNING TOTAL SNOWFALL 24 HRS ENDING 8 A.M........ 0.0 DEPARTURE....- 0.1 TOTAL SNOWFALL FOR THE MONTH.............. 0.2 DEPARTURE....- 1.8 TOTAL SNOWFALL FOR THE SEASON.............119.4 DEPARTURE.....+60.2 YESTERDAY'S PEAK GUSTS AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY........27 SSW AT 10:50 P.M. AEROVANE.........27 SSW AT 10:50 P.M. ASOS.............23 SSW AT 10:55 P.M. DAVIS............26 S AT 7:57 P.M. FASTEST MILE FOR YESTERDAY......... 20 SSW AT 10:56 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE.......18 SSW AT 11:40 P.M. * MAXIMUM 1-MINUTE DAVIS AVERAGE......20 SSW AT 10:10 P.M. OUR AVERAGE SPEED AND DIRECTION..... 9.4 SSW ASOS AVERAGE AND DIRECTION..........10.4 DAVIS AVERAGE AND DIRECTION......... 9.5 SSW [210 deg] * Eastern Standard Time THE PRELIMINARY CLIMATE SUMMARY FOR APRIL 2005...... CALENDAR DAY DATA DATA REPORTED HERE ENDING MIDNIGHT STANDARD TIME 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 56/36/46/+5/0.01/0/283/37 23 MPH SE 4/2 56/35/46/+4/1.04/0/000/00 53 MPH SE 4/3 53/39/46/+4/0.63.0/254/33 54 MPH SE Aero 55 MPH SE 4/4 52/37/45/+3/0.01/0/131/17 32 MPH W 4/5 63/35/49/+6/0/0/721/93 32 MPH WNW Aero 35 MPH WNW 4/6 66/43/55/+12/0/0/591/76 25 MPH S 4/7 70/44/57/+14/0.07/0/164/21 46 MPH SSW 4/8 56/43/50/+6/0.25/0/212/27 32 MPH NW 4/9 58/39/49/+5/0/0/786/100 22 MPH NW 4/10 70/39/55/+11/0/0/742/94 38 MPH NNE 4/11 48/36/42/-3/0/0/744/94 32 MPH NNE 4/12 48/28/38/-7/0.03/0.2/413/52 32 MPH NE 4/13 50/28/39/-6/0/0/427/78 22 MPH WNW 4/14 50/36/43/-3/0/0/.../.. 23 MPH WNW 4/15 48/34/41/-5/0/0/.../.. 35 MPH NE 4/16 55/35/45/-1/0/0/.../.. 22 MPH ESE 4/17 74/37/56/+9/0/0/784/97 23 MPH WNW 4/18 70/48/59/+12/0/0/795/98 27 MPH NW Aero 30 MPH WNW 4/19 78/46/62/+15/0/0/.../.. 27 MPH SSW 4/20 Morning low 57 degrees, high so far 86 degrees... DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR APRIL 20 HIGH 88 IN 1927 LOW 18 IN 1897 PRECIP 1.14 IN 1972 SNOWFALL 2.5 IN. IN 1904, 1972 PEAK GUST 76 MPH WNW IN 1963 RECORDS FOR APRIL 21 HIGH 85 IN 1923 LOW 22 IN 1908 PRECIP 3.18 IN. IN 1991 SNOWFALL 0.8 IN. IN 1947 PEAK GUST 76e MPH NE IN 1940 TODAY'S REPORT BY: Matt Douglas