BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY THURSDAY, JULY 23, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME Today's observations: 7 A.M. Weather: Overcast cirrostratus, thin fog Temperature: 69F, Dew point: 67F, Wind: N at 7 kts Wind: veering Sea-level pressure: 30.13 inches Hg, rising Visibility: 5 miles, fog 6-hour minimum temp: 65F BHO SA 1155 E20 OVC 5F 202/69/67/0107/013/ THN FG INVSN PRSNT WND VEERING/ 8/007 50001 10069 20065 10 A.M. Weather: Scattered stratocumulus, overcast altostratus, moderate cumulus forming S-W-N, higher clouds visible Temperature: 68F, Dew point: 64F, Wind: NE at 11 kts, Wind: direction variability NW to E Sea-level pressure: 30.11 inches Hg, falling Visibility: 12 miles, thin fog BHO SA 1455 30 SCT E180 OVC 12 197/68/64/0411/011/ MDT CU FRMG S-W-N HIER CLDS VSBL THN FG WND 31V08/ 8/271 58005 1 P.M. Weather: Sky obscured with fog, light drizzle Temperature: 63F, Dew point: 63F, Wind: NE at 11 kts Sea-level pressure: 30.13 inches Hg, rising Visibility: 1/16 mile, fog 6-hourly max. temp: 72F 6-hour precipitation: Trace BHO SA 1755 W1 X 1/16L-F 204/63/63/0511/013/ 8//// 53007 MANUAL 6000/ 10072 20062 WEATHER SUMMARY FOR WEDNESDAY, JULY 22 TEMPERATURE (DEGREES F) MAX.....77 NORMAL.....82 MIN.....61 NORMAL.....63 MEAN....69 NORMAL.....72 DEPARTURE FROM 30-YEAR AVERAGE..........-3 TOTAL DEPARTURE FOR THE MONTH..........-96 [-4.6 DEGREES/DAY] HEATING DEGREE DATA WILL RESUME IN SEPTEMBER PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............15 W AT 3:33 P.M. AEROVANE..............14 WSW AT 4:09 P.M. * ASOS..................15 W AT 4:09 P.M. DAVIS.................17 WSW AT 1:41 P.M. FASTEST MILE FOR YESTERDAY...............11 WSW AT 4:08 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE............12 W AT 4:11 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........12 W AT 2:33 P.M. AVERAGE WIND SPEED AND DIRECTION........5.4 WSW ASOS.................5.5 DAVIS................5.2 WSW [252 DEG] * last of several occurrences... PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.00 DEPARTURE....-0.12 ASOS..............0.00 TOTAL PRECIPITATION FOR THE MONTH..........4.07 DEPARTURE....+1.41 ASOS..............4.12 TOTAL PRECIPITATION FOR THE YEAR..........27.71 DEPARTURE....-0.62 ASOS.............28.77 PRELIMINARY CLIMATE SUMMARY FOR JULY 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 7/1 62/57/60/-10/0.51/000/00 25 NNE TSTM 7/2 66/56/61/-9/1.00/000/00 29 SSW TSTM 7/3 75/58/67/-3/T/283/31 23 WSW 7/4 77/59/68/-2/0/838/92 43 W 7/5 78/54/66/-5/0/856/94 33 W 7/6 79/60/70/-1/0/883/97 20 SSE 7/7 66/58/62/-9/0.73/027/03 28 SE TSTM 7/8 67/56/62/-9/0.23/091/10 27 NNE TSTM 7/9 66/55/61/-10/0/689/76 23 NE 7/10 76/54/65/-6/0/896/99 21 SW 7/11 77/56/67/-5/0.29/686/76 36 S 7/12 78/60/69/-3/0.33/650/72 30 SSW TSTM 7/13 76/55/66/-6/0/802/89 32 SW 7/14 75/56/66/-6/0/567/63 25 WNW 7/15 79/55/67/-5/0/826/92 30 WSW 7/16 77/62/70/-2/T/161/18 30 S 7/17 86/65/76/+4/0.01/582/65 24 ESE 7/18 84/66/75/+3/0.35/447/50 25 SSW TSTM 7/19 80/62/71/-1/0/865/97 27 WSW 7/20 80/64/72/0/0/481/54 16 E 7/21 66/61/64/-8/0.62/000/00 29 NNE 7/22 77/61/69/-3/T/.../.. 15 W 7/23 our morning low temp: 65F; the normal low is now 63F NEW DAILY RECORDS FOR JULY 2009 TO DATE... NONE DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JULY 23 HIGH 99F IN 1952 LOW 51F IN 1923,1977 PRECIP 1.82 INCHES IN 1953 PEAK GUST 54e MPH S IN 1946 RECORDS FOR JULY 24 HIGH 96F IN 1987 LOW 49F IN 1893,1912 PRECIP 2.21 INCHES IN 1988 PEAK GUST 41 MPH S IN 1975, 41e MPH WSW 1977 TODAY'S REPORT PREPARED BY: Stephanie Radner