BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY SATURDAY, NOVEMBER 21, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME PARTLY CLOUDY AND WARM TODAY... High thin clouds have filled the sky for much of the day after a colorful sunrise this morning. Although cooler than yesterday, the middle 50s today are still much warmer than normal for this part of November. The month is now more than 4 degrees warmer than average per day. The cirrus fibratus are providing some optical effects in the sky today. A partial halo was visible at mid-morning, and faint double parahelia are occasionally visible at mid-afternoon to either side of the lowering sun. Today's observations: 7 A.M. Weather: Scattered altocumulus, scattered dense cirrus, thin overcast cirrus fibratus, hazy Temperature: 41F, Dew point: 36F, Wind: WSW at 12 kts Sea-level pressure: 30.00 inches Hg, rising Visibility: 25 miles, visibility 35 miles SE-S 6-hour minimum temp: 41F 24-hour precipitation: 0.54 in. BHO SA 1155 180 SCT 200 SCT 250 –OVC 25 159/41/36/2512/000/ VSBY SE-S 35 HAZY/ 8/031 53010 70054 10043 20041 10 A.M. Weather: Thin overcast cirrus fibratus, few lower dense cirrus, partial halo (upper portion visible), hazy Temperature: 49F, Dew point: 40F, Wind: W at 7 kts Sea-level pressure: 30.04 inches Hg, rising Visibility: 30 miles BHO SA 1455 250 –OVC 30 173/49/40/2707/004/ FEW LWR DNS CI PARTIAL HALO HAZY WND LGT/ 8/001 53014 1 P.M. Weather: Thin overcast cirrus fibratus, few lower dense cirrus, hazy Temperature: 54F, Dew point: 41F, Wind: W at 7 kts Sea-level pressure: 30.02 inches Hg, falling Visibility: 45 miles 6-hour max. temp: 54F BHO SA 1755 250 –OVC 45 167/54/41/2707/002/ FEW LWR DNS CI HAZY WND LGT/ 8/001 58006 10054 20041 WEATHER SUMMARY FOR FRIDAY, NOVEMBER 20 TEMPERATURE (DEGREES F) MAX.....65 NORMAL.....48 MIN.....44 NORMAL.....33 MEAN....55 NORMAL.....40 DEPARTURE FROM 30-YEAR AVERAGE............+15 TOTAL DEPARTURE FOR THE MONTH.............+91 [+4.4 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY............10 DEPARTURE.......-15 TOTAL HEATING UNITS FOR THE MONTH...........339 DEPARTURE.......-92 TOTAL HEATING UNITS FOR THE SEASON..........960 DEPARTURE.......-62 TOTAL HEATING UNITS LAST SEASON TO DATE.....934 DIFFERENCE......+26 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............40 W AT 4:09 P.M. * AEROVANE..............41 W AT 4:09 P.M. ASOS..................41 W AT 4:10 P.M. DAVIS.................42 S AT 10:04 A.M. FASTEST MILE FOR YESTERDAY...............29 S AT 10:04 A.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............29 S AT 10:06 A.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........28 W AT 4:14 P.M. AVERAGE WIND SPEED AND DIRECTION.......19.5 SE ASOS................18.1 DAVIS...............18.6 SSW [193 DEG] * Last of several occurrences. PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.54 DEPARTURE....+0.38 ASOS..............0.57 TOTAL PRECIPITATION FOR THE MONTH..........2.77 DEPARTURE....-0.35 ASOS..............2.84 TOTAL PRECIPITATION FOR THE YEAR..........47.88 DEPARTURE....+2.74 ASOS.............49.15 SNOWFALL (INCHES) THROUGH THIS MORNING (EST) TOTAL SNOWFALL 24 HRS ENDING 7 A.M..........0.0 DEPARTURE.....-0.1 TOTAL SNOWFALL FOR THE MONTH................0.0 DEPARTURE.....-1.7 TOTAL SNOWFALL FOR THE SEASON...............3.0 DEPARTURE.....+1.1 PRELIMINARY CLIMATE SUMMARY FOR NOVEMBER 2009 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane wind recording system gust when significant TSTM: Thunderstorm day (thunder heard some time during day) ....: Data not yet available, records not finalized 11/1 58/44/51/+4/0.05/167/27 22 WNW 11/2 49/42/46/0/T/099/16 29 NE 11/3 57/36/47/+1/0/474/77 32 W AERO 32 MPH W 11/4 49/34/42/-4/0/514/84 24 W 11/5 46/36/41/-4/0.01/006/01 21 N 11/6 47/31/39/-6/0/419/69 38 WNW AERO 38 MPH WNW 11/7 49/29/39/-6/0/575/95 33 S 11/8 66/42/54/+10/0/549/91 31 SSW 11/9 68/49/59/+15/0/486/81 35 S AERO 35 MPH S 11/10 62/50/56/+12/0/000/00 23 SW 11/11 50/43/47/+4/0/113/19 31 NNE 11/12 49/41/45/+2/0/125/21 34 NE AERO 31 MPH NNE 11/13 49/44/47/+4/0/000/00 39 NNE AERO 37 MPH NNE 11/14 59/49/54/+12/2.08/000/00 39 NE AERO 38 MPH NE 11/15 60/52/56/+14/0.06/012/02 18 W 11/16 56/43/50/+8/0/527/90 30 NW AERO 31 MPH NW 11/17 47/35/41/0/0/576/99 28 WNW 11/18 49/34/42/+1/0/.../.. 15 SSW 11/19 59/41/50/+9/0/.../.. 30 SE 11/20 65/44/55/+15/0.57/.../.. 40 W AERO 41 MPH W 11/21 morning low temp: 41F; the normal low is now 33F NEW DAILY RECORD FOR NOVEMBER 2009 11/14: NEW RECORD DAILY RAINFALL 2.08 INCHES; surpasses previous 1.87 inches in 1972. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR NOVEMBER 21 HIGH 69 IN 1931 LOW 10 IN 1888 PRECIP 2.60 INCHES IN 1950 SNOWFALL 4.0 INS IN 1929 PEAK GUST 69 NW IN 1989 RECORDS FOR NOVEMBER 22 HIGH 70 IN 1931 LOW 12 IN 1987 PRECIP 1.78 INS IN 2005 SNOWFALL 9.0 INS IN 1971 PEAK GUST 70e SE IN 1945 TODAY'S REPORT PREPARED BY: Mike Iacono