BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY WEDNESDAY, FEBRUARY 20, 2008 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Clear, few distant cumulus and cirrus Temperature: 18F, Dew point: 8F, Wind: WSW at 11 kts Sea-level pressure: 30.00 inches Hg, rising Visibility: 35 miles 6-hour min temp: 18F 24-hour precipitation: 0.02 inch 24-hour snowfall: 0.2 inch BHO SA 1155 CLR 35 158/18/8/2411/000/ FEW CU E FEW DSNT CI E-SW AND NW TOTAL NEW SNW PAST 24 HRS 0.2 IN/ 8/101 53019 MANUAL 70002 ASOS 70002 10021 20018 10 A.M. Weather: Clear, few cumulus all quadrants, few cirrus distant ESE-SSW Temperature: 25F, Dew point: 7F, Wind: WSW at 12G21 kts Wind: variable in direction S-WNW Sea-level pressure: 30.03 inches Hg, rising Visibility: 35 miles BHO SA 1455 CLR 35 168/25/7/2412G21/003/ FEW CU ALQDS FEW CI DSNT ESE-SSW WND 19V30/ 8/101 50010 1 P.M. Weather: Broken stratocumulus, cirrostratus Temperature: 26F, Dew point: 7F, Wind: W at 14G25 kts Wind: Peak gust to 27 kts from WSW at 11:59 P.M. Sea-level pressure: 29.99 inches Hg, falling Visibility: 40 miles 6-hour max. temp: 27F BHO SA 1755 E55 BKN 220 BKN 40 157/26/7/2614G25/999/ PK WND 2527/1659/ 8/508 56011 10027 20018 WEATHER SUMMARY FOR TUESDAY, FEBRUARY 19 TEMPERATURE (DEGREES F) MAX.....43 NORMAL.....37 MIN.....22 NORMAL.....21 MEAN....33 NORMAL.....29 DEPARTURE FROM 30-YEAR NORMAL..........+ 4 TOTAL DEPARTURE FOR THE MONTH..........+98 [+5.0 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............32 DEPARTURE.......-4 TOTAL HEATING UNITS FOR THE MONTH...........617 DEPARTURE.....-101 TOTAL HEATING UNITS FOR THE SEASON.........3854 DEPARTURE.....-401 TOTAL HEATING UNITS LAST SEASON TO DATE....3785 DIFFERENCE.....+69 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............44 SSW AT 10:23 A.M. AEROVANE.............46 SSW AT 10:23 A.M. ASOS.................43 SW AT 11:03 A.M. DAVIS................49 SSW AT 10:53 A.M. FASTEST MILE FOR YESTERDAY..............33 SSW AT 10:22 A.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........31 SW AT 10:24 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........38 SSW AT 10:23 A.M. AVERAGE WIND SPEED AND DIRECTION......17.7 SW ASOS...............17.4 DAVIS..............18.1 WSW [239 deg.] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.02 DEPARTURE......-0.12 ASOS..............0.02 TOTAL PRECIPITATION FOR THE MONTH..........6.96 DEPARTURE......+4.23 ASOS..............N/A # TOTAL PRECIPITATION FOR THE YEAR..........10.83 DEPARTURE......+3.32 ASOS..............N/A # # ASOS PRECIPITATION DATA ERROR ON 2/13/08 MONTHLY AND 2008 ASOS TOTAL NOT AVAILABLE SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.2 DEPARTURE.....-0.3 TOTAL SNOWFALL FOR THE MONTH................7.6 DEPARTURE.....-3.9 TOTAL SNOWFALL FOR THE SEASON..............51.7 DEPARTURE....+10.8 PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 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 2/1 53/26/40/+14/1.16/0.1/000/00 54 SSE Aero 59 MPH SSE TSTM 2/2 51/34/43/+17/T/0/391/65 52 SW Aero 52 MPH SW 2/3 45/33/39/+13/0/0/381/63 21 SW 2/4 38/29/34/+8/0/0/006/01 18 SE 2/5 45/33/39/+12/0.42/0/000/00 36 SE Aero 37 MPH SE 2/6 46/34/40/+13/0.88/0/000/00 36 NE Aero 33 MPH NE TSTM 2/7 34/26/30/+3/0.59/1.9/000/00 40 NE Aero 40 MPH NE TSTM 2/8 28/24/26/-1/0.08/0.5/000/00 21 W 2/9 36/21/29/+2/0.09/1.0/118/19 30 ESE 2/10 40/11/26/-1/0.08/0.9/090/11 56 W Aero 61 MPH W 2/11 22/7/15/-12/0/0/612/98 56 W Aero 60 MPH W 2/12 26/9/18/-10/0.27/2.0/351/56 25 W 2/13 53/22/38/+10/2.80/1.0/000/00 52 S Aero 54 MPH S 2/14 36/26/31/+3/0/0/517/82 39 WNW 2/15 46/24/35/+7/0/0/406/64 47 W Aero 50 MPH W 2/16 29/16/23/-5/0/0/586/92 32 W 2/17 44/18/31/+2/0.02//0/415/65 43 SSE Aero 43 MPH SSE 2/18 59/37/48/+19/0.55/0/006/01 69 S Aero 70 MPH S 2/19 43/22/33/+4/0.02/0.2/600/93 44 SSW Aero 46 MPH SSW 2/20 morning low temp. 18F; our normal low is now 21F NEW DAILY RECORDS FOR FEBRUARY 2008: 2/13 - New record daily precipitation 2.80 inches; surpasses previous record of 1.90 inches in 1966 2/18 - New record peak wind gust of 69 MPH S; surpasses 65 MPH (estimated) NNW in 1952 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR FEBRUARY 20 HIGH 66F IN 1930 LOW -4F IN 1966 PRECIP 1.90 INCHES IN 1934 SNOWFALL 15.0 INCHES IN 1921,1934 PEAK GUST 78 MPH NW IN 1972 RECORDS FOR FEBRUARY 21 HIGH 62F IN 1930 LOW -6F IN 1950 PRECIP 2.42 INCHES IN 1898 SNOWFALL 9.0 INCHES IN 1929 PEAK GUST 72 MPH WNW IN 1967 TODAY'S REPORT PREPARED By: Stephanie Radner