BLUE HILL METEOROLOGICAL OBSERVATORY, MILTON, MASSACHUSETTS 02186 ELEVATION 635 FT. ABOVE MSL....10 MILES SSW OF BOSTON, MA FRIDAY APRIL 05 2002 PLEASE VISIT OUR WEB SITE AT: http://www.bluehill.org/ DAILY DISCUSSION.....4/5/2002 COLD AIR RETURNS...YESTERDAY FIRST DAY THIS MONTH TO AVERAGE BELOW NORMAL... The cold air has returned for a 3 days visit starting yesterday. The mean temperature for the day was 40 degrees, which was 2 degrees below normal for the date. The morning low this morning was 26 degrees which is 8 degrees below the expected low temperature for today. Total departure for the month is now +17 degrees. TODAY'S OBS..... 7 A.M. BHO SA 1155 CLR 70 238/30/17/3007/023/ AC/ACSL DSNT NE-S CI/DENSE CI DSNT NE-S THN K LYR ALNG HRZN ALQDS WND LGT/ 8/042/ 51003 10031 20026 10 A.M. BHO SA 1455 35 SCT 231/37/15/1805/021/ AC LYR DSNT NE-S DENSE CI DSNT NE-S WND L/V/ 8/532/ 56006 THE DATA RECORDED FOR THURSDAY APRIL 4... TEMPERATURES....CALENDAR DAY MIDNIGHT TO MIDNIGHT.... MAX : 48 MIN: 31 // ASOS MAX: 48 ASOS MIN: 30 NORMAL HIGH AND LOW: 51/34 MEAN 40 [ - 2 ] TOTAL DEPARTURE FOR APRIL TO DATE: + 17 deg. PRECIPITATION....ON 04/05 AS OF 7 A.M. 24 HRS ENDING 7 A.M. . 0.00 IN. ASOS......................0.00 INS. TOTAL FOR APRIL TO DATE...1.18 INS. STD GAGE DEP. FROM NORMAL.........+0.58 INS. PRECIP. TOTAL YEAR 2002: 11.38 INS. DEPARTURE FROM NORMAL....-2.85 INS. SNOWFALL.... ON 04/05 AS OF 7 A.M. 24 HRS ENDING 7 A.M.... 0.0 INS. SEASONAL TOTAL TO DATE. 39.0 INS. WIND DATA....FOR 04/04... PEAK GUST ASOS: 29 MPH WNW AT 3:16 P.M. PEAK GUST 420C: 31 MPH WNW AT 2:33 P.M. PEAK GUST AERO: 34 MPH WNW AT 2:33 P.M. APRIL 2002 PRELIMINARY DATA....ALL IS CALENDAR DAY DATA.... MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUNSHINE/ OFFICIAL 420C WIND GUST Aero = Aerovane recording wind system 4/1 56/38/47/+6/1.02/0/244/32/ 54 W 4/2 59/33/46/+4/0/0/582/76/ 37 W 4/3 66/36/51/+9/0.16/0/138/18/ 43 S (Aero 45 MPH WNW ) 4/4 48/31/40/-2/0/0/.../../ 31 WNW 4/5 Morning low... 26 degrees RECORDS FOR APRIL 05 HIGH 81 IN 1928 LOW 15 IN 1995 PRECIP 2.15 INS 1987 SNOWFALL: 4.0 INS. 1898 PEAK GUST 76 MPH WNW IN 1963 RECORDS FOR APRIL 06 HIGH 82 IN 1921 LOW 16 IN 1982 PRECIP 1.72 INS 1886 SNOWFALL: 12.3 INS. 1898 PEAK GUST 71e MPH WNW IN 1940 e = estimated MFD