BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, FEBRUARY 13, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Scattered altocumulus, scattered cirrus, few stratocumulus/cumulus all quadrants Temperature: 30F, Dew point: 17F, Wind: WNW at 18G29 kts, Wind: Peak gust past hour 36 kts WNW at 6:23 A.M. Wind: Variable direction WSW to NNW Sea-level pressure: 29.60 inches Hg, rising Visibility: 40 miles 6-hour minimum temperature: 30F 24-hour precipitation: Trace Snow depth on ground: Trace BHO SA 1155 140 SCT 250 SCT 40 023/30/17/2918G29/960/ FEW SC/CU ALQDS PK WND 2936/23 WND 24V34/ 8/531 53035 10038 20030 10 A.M. Weather: Broken altocumulus, overcast cirrus, few stratocumulus distant S-SW, patches dense cirrus, thin spots in overcast N-E Temperature: 30F, Dew point: 8F, Wind: WNW at 20G28 kts, Wind: Peak gust past hour 29 kts WNW at 9:25 A.M. Wind: Variable direction WSW to NNW Sea-level pressure: 29.70 inches Hg, rising Visibility: 70 miles BHO SA 1455 E200 BKN 250 OVC 70 058/30/8/3020G28/970/ FEW SC DSNT S-SW PTCHS DENS CI THN SPTS IOVC N-E PK WND 3029/25 WND 24V34/ 8/507 51035 1 P.M. Weather: Overcast cirrostratus/cirrus, dense cirrus all quadrants, few stratocumulus distant S, break in overcast NE-E Temperature: 32F, Dew point: 10F, Wind: WNW at 16G27 kts, Wind: Peak gust past hour 28 kts NW at 11:57 A.M. Wind: Variable direction WSW to NNW Sea-level pressure: 29.71 inches Hg, rising Visibility: 75 miles 6-hour maximum temperature: 33F BHO SA 1755 E200 OVC 75 061/32/10/2916G27/971/ FEW SC DSNT S DENS CI ALQDS BINOVC NE-E PK WND 3128/1657 WND 24V34/ 8/507 50003 10033 20029 WEATHER SUMMARY FOR THURSDAY, FEBRUARY 12 TEMPERATURE (DEGREES F) MAX.....51 NORMAL.....35 MIN.....37 NORMAL.....20 MEAN....44 NORMAL.....28 DEPARTURE FROM 30-YEAR NORMAL................+16 TOTAL DEPARTURE FOR THE MONTH................+38 [+3.0 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............21 DEPARTURE........-17 TOTAL HEATING UNITS FOR THE MONTH............421 DEPARTURE........-41 TOTAL HEATING UNITS FOR THE SEASON..........3989 DEPARTURE.........-9 TOTAL HEATING UNITS LAST SEASON TO DATE.....3638 DIFFERENCE......+351 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............54 WSW AT 3:49 P.M. AEROVANE.............54 WSW AT 3:49 P.M. ASOS.................52 W AT 3:51 P.M. DAVIS................49 WSW AT 4:23 P.M. FASTEST MILE FOR YESTERDAY..............41 WSW AT 3:51 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........39 W AT 3:51 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........36 WSW AT 3:49 P.M. AVERAGE..............24.7 WSW ASOS.................23.7 DAVIS................21.9 WSW [237 DEGREES] PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....Trace DEPARTURE.........-0.14 ASOS...............0.00 TOTAL PRECIPITATION FOR THE MONTH...........0.62 DEPARTURE.........-1.13 ASOS...............0.62 TOTAL PRECIPITATION FOR THE YEAR............4.78 DEPARTURE.........-1.75 ASOS...............5.82 # # Includes erroneous ASOS precipitation data on 1/1/09 and 1/2/09 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.........-0.6 TOTAL SNOWFALL FOR THE MONTH................6.5 DEPARTURE.........-1.2 TOTAL SNOWFALL FOR THE SEASON..............61.6 DEPARTURE........+24.5 PRELIMINARY CLIMATE SUMMARY FOR FEBRUARY 2009 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 2/1 45/15/30/+4/0/0/402/67 35 SW 2/2 50/32/41/+15/0/0/568/94 29 NNW 2/3 33/22/28/+2/0.44/5.6/000/00 39 N AERO 38 MPH N 2/4 24/10/17/-9/0.05/0.9/572/94 37 WNW 2/5 17/3/10/-17/0/0/538/88 33 W 2/6 26/4/15/-12/0/0/509/83 26 W 2/7 42/16/29/+2/0/0/314/51 45 S AERO 44 MPH S 2/8 49/30/40/+13/0/0/433/70 54 W AERO 54 MPH W 2/9 37/21/29/+2/0/0/621/100 38 WNW AERO 38 MPH WNW 2/10 36/22/29/+2/0/0/.../.. 21 SSE 2/11 59/34/47/+20/0/0/.../.. 29 SSE AERO 24 MPH SSE 2/12 51/37/44/+16/0.13/0/.../.. 54 WSW 2/13 morning low temp: 30F; our normal low is now 20F NEW DAILY RECORDS FOR FEBRUARY 2009... None to date DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR FEBRUARY 13 HIGH 64F IN 1951 LOW -10F IN 1967 PRECIP 1.90 INCHES IN 1966 SNOWFALL 13.5 INCHES IN 1894 PEAK GUST 60 MPH SE IN 1972 RECORDS FOR FEBRUARY 14 HIGH 56F IN 1949 LOW -8F IN 1979 PRECIP 2.09 INCHES IN 2007 SNOWFALL 11.0 INCHES IN 1914 PEAK GUST 83 MPH SSW IN 2000 TODAY'S REPORT PREPARED By: Stephanie Radner