BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, JULY 24, 2009 ALL TIMES ARE IN EASTERN STANDARD TIME JULY 2009 IS NOW 9TH WETTEST JULY ON RECORD NEW RECORD WIND GUST FOR JULY 24 OF 46 MPH As of 2:00 PM EDT, we have measured 2.75 inches of precipitation since the rain began just before 2:00 PM EDT yesterday. This brings the total precipitation for the month of July to 6.82 inches, making this month the 9th wettest July on record. The rankings for July precipitation in inches, dating back to 1886 are: 1. 11.67 in 1938 2. 10.66 in 1988 3. 10.43 in 1921 4. 9.52 in 1915 5. 8.47 in 1889 6. 7.55 in 1916 7. 7.41 in 1898 8. 7.31 in 1989 9. 6.82 in 2009 * 10. 6.66 in 1959 * precipitation through 2:00 PM EDT on July 24 We have also recorded a new record wind gust for today's date of 46 MPH from the northeast. The peak gust for the day so far occurred at 4:32 AM EDT. This surpasses the previous record for July 24 of 41 MPH S IN 1975 and 41e MPH WSW 1977. The storm total so far is 2.75 inches. Preliminary calculation of hourly precipitation amounts puts today's rainfall (since midnight EST) at 2.07 inches, which just a bit less than the record for today's date of 2.21 inches, which occurred in 1988. Today's observations: 7 A.M. Weather: Overcast stratus, moderate rain Temperature: 60F, Dew point: 60F, Wind: NNW at 16G28 kts Wind: Direction variable WNW to NE Wind: Peak gust past hour 36 kts NNW at 6:07 A.M. Sea-level pressure: 29.72 inches Hg, falling Visibility: 1 1/2 miles, rain and fog 24-hour precipitation: 2.53 inches 6-hour precipitation: 1.46 inches 6-hour minimum temp: 60F BHO SA 1155 E5 OVC 11/2RF 063/60/60/3416G28/972/ PK WND 3436/07 WND 30V04/ 8/7// 56011 MANUAL 6146/ ASOS 60148 MANUAL 70253 ASOS 70260 10060 20060 10 A.M. Weather: Sky obscured with fog, light rain Temperature: 61F, Dew point: 61F, Wind: NW at 14G25 kts, Wind: direction variabile W to N Wind: Peak gust past hour 27 kts NW at 9:11 A.M. Sea-level pressure: 29.76 inches Hg, rising Visibility: 1/4 mile, variable 1/16 to 1 mile 3-hour precipitation: 0.20 inches BHO SA 1455 W3 X 1/4VR-F 079/61/61/3214G25/976/ VSBY 1/16V1 PK WND 3227/11 WND 26V01/ 8//// 53016 MANUAL 6020/ ASOS 60022 1 P.M. Weather: Overcast stratus, light rain Temperature: 64F, Dew point: 61F, Wind: WNW at 11G21 kts Wind: Direction variable WSW to NNW Sea-level pressure: 29.83 inches Hg, rising Visibility: 10 miles, thin fog 6-hourly max. temp: 65F BHO SA 1755 E10 OVC 10R- 103/64/61/3011G21/983/ THN FG WND 24V33/ 8/7// 53024 MANUAL 6022/ ASOS 60024 10065 20060 WEATHER SUMMARY FOR THURSDAY, JULY 23 TEMPERATURE (DEGREES F) MAX.....72 NORMAL.....82 MIN.....60 NORMAL.....63 MEAN....66 NORMAL.....72 DEPARTURE FROM 30-YEAR AVERAGE..........-6 TOTAL DEPARTURE FOR THE MONTH.........-102 [-4.6 DEGREES/DAY] HEATING DEGREE DATA WILL RESUME IN SEPTEMBER PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY.............35 NE AT 11:54 P.M. * AEROVANE..............29 NE AT 11:49 P.M. ASOS..................31 ENE AT 11:55 P.M. DAVIS.................N/A FASTEST MILE FOR YESTERDAY...............22 NE AT 11:48 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE............22 ENE AT 11:10 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE...........N/A AVERAGE WIND SPEED AND DIRECTION........10.8 NE ASOS.................10.5 DAVIS.................9.9 NE/NNE [034 DEG] * last of several occurrences... ** yesterday's report included several typographical errors in the wind section that have been corrected in the archive files on the website PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....2.53 DEPARTURE....+2.41 ASOS..............2.60 TOTAL PRECIPITATION FOR THE MONTH..........6.60 DEPARTURE....+3.82 ASOS..............6.72 TOTAL PRECIPITATION FOR THE YEAR..........30.24 DEPARTURE....+1.79 ASOS.............31.37 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 72/60/66/-6/0.68/.../.. 35 NE 7/24 our morning low temp: 60F; the normal low is now 63F NEW DAILY RECORDS FOR JULY 2009 TO DATE... Preliminary: 7/24: New record peak gust 46 MPH NE at 3:32 A.M.; surpasses 41 MPH S IN 1975, 41e MPH WSW 1977 DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): 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 RECORDS FOR JULY 25 HIGH 94F IN 1963,1987 LOW 51F IN 1901,1953 PRECIP 2.25 INCHES IN 1990 PEAK GUST 88 MPH NW IN 1972 TODAY'S REPORT PREPARED BY: Stephanie Radner