BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY FRIDAY, JUNE 27, 2008 ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED SEVERE THUNDERSTORMS TO OUR NORTH AND NORTHEAST DAY NO. 8 FOR JUNE WITH THUNDER HEARD Severe thunderstorms were moving eastward just a few miles north of Blue Hill between 1:00 and 2:00 P.M. EDT. Rumbles of thunder could be heard and several flashes of lightning in the clouds as well as several cloud to ground flashes were observed to the NNW-NE. A few light showers yesterday brought only 0.02 inch of rain, and another 0.02 inch fell today just before 1:00 PM EDT. Today's observations: 8 A.M. EDT Weather: Overcast cirrostratus, thin spots in overcast Temperature: 70F, Dew point: 65F, Wind: SW at 6 kts Sea-level pressure: 29.83 inches Hg, rising Visibility: 5 miles, hazy 6-hourly minimum temperature: 64F 24-hourly rainfall: 0.02 in. BHO SA 1155 E220 OVC 5H 103/70/65/2306/983/ THN SPTS IOVC/ 8/007 53013 MANUAL 70002 ASOS 70001 10070 20064 11 A.M. EDT Weather: Scattered altocumulus, broken cirrostratus, overcast cirrus, thin spots in overcast, few moderate cumulus forming E-SW Temperature: 81F, Dew point: 68F, Wind: SW at 10 kts Wind: Direction variability S-W Sea-level pressure: 29.85 inches Hg, rising Visibility: 10 miles, hazy BHO SA 1455 170 SCT E200 BKN 250 OVC 10 108/81/68/2410/985/ FEW MDT CU FRMG E-SW HAZY WND 18V28/ 8/232 51005 2 P.M. EDT Weather: Scattered towering cumulus N-NNE, broken altocumulus, overcast cirrostratus, cumulonimbus NW-NNE moving E, thin spots in overcast SE-SW, thunder, occasional lightning in clouds, cloud-ground NNW moving E Temperature: 83F, Dew point: 68F, Wind: S at 11 kts Wind: Direction variabiligy SSE-SW Sea-level pressure: 29.81 inches Hg, falling Visibility: 10 miles, hazy 6-hourly maximum temperature: 85F 6-hourly precipitation: 0.02 inch BHO SA 1755 10 SCT E170 BKN 220 OVC 10T 095/83/68/1911/981/ TB30 NNW MOVG E OCNL LTGICCG NNW-N CB NW-NNE MOVG E TCU N-NNE THN SPTS IOVC SE-SW HAZY WND 15V23/ 8/973 58013 MANUAL 6002/ ASOS 60002 10085 20070 WEATHER SUMMARY FOR THURSDAY, JUNE 26 TEMPERATURE (DEGREES F) MAX.....79 NORMAL.....78 MIN.....62 NORMAL.....59 MEAN....71 NORMAL.....68 DEPARTURE FROM 30-YEAR NORMAL.............+3 TOTAL DEPARTURE FOR THE MONTH............+89 [+3.2 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............0 DEPARTURE........-1 TOTAL HEATING UNITS FOR THE MONTH............41 DEPARTURE.......-29 TOTAL HEATING UNITS FOR THE SEASON.........5942 DEPARTURE......-425 TOTAL HEATING UNITS LAST SEASON TO DATE....5911 DIFFERENCE......+31 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............31 S AT 3:54 P.M. AEROVANE.............30 S AT 3:54 P.M. ASOS.................31 SSW AT 3:55 P.M. DAVIS................34 S AT 3:54 P.M. FASTEST MILE FOR YESTERDAY..............23 S AT 3:52 P.M. MAXIMUM 2-MINUTE ASOS AVERAGE...........25 SSW AT 3:55 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........28 SSW AT 3:55 P.M. AVERAGE............ 9.5 SW ASOS................9.6 DAVIS...............9.9 SSW [210 deg] * last of several occurrences PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.02 DEPARTURE......-0.11 ASOS..............0.01 TOTAL PRECIPITATION FOR THE MONTH..........2.30 DEPARTURE......-1.11 ASOS..............2.31 TOTAL PRECIPITATION FOR THE YEAR..........24.96 DEPARTURE......-0.19 ASOS.............27.35 # # Includes erroneous ASOS precipitation data on 2/13/08. PRELIMINARY CLIMATE SUMMARY FOR JUNE 2008 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/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 6/1 79/58/69/+7/0/833/92 32 W 6/2 76/53/65/+3/0/834/92 28 WNW 6/3 84/58/71/+9/0/707/78 28 S 6/4 66/54/60/-3/0.53/000/00 25 SSW Aero 23 MPH SSW 6/5 55/51/53/-10/0.11/000/00 31 N Aero 28 MPH N 6/6 59/51/55/-8/0.13/000/00 21 SSE 6/7 91/55/73/+9/0.07/575/63 45 SW Aero 46 MPH SW TSTM 6/8 91/72/82/+18/0/703/77 31 WSW 6/9 94/71/83/+19/0/794/87 29 W 6/10 98/72/85/+21/0/876/97 58 W Aero 58 MPH W 6/11 85/68/77/+12/0/804/88 28 W Aero 26 MPH W 6/12 78/60/69/+4/0/888/97 28 NW Aero 26 MPH NW 6/13 82/55/69/+4/0/888/97 21 NW 6/14 78/62/70/+5/0.08/687/75 21 NW TSTM 6/15 63/54/59/-7/0.42/000/00 20 E 6/16 63/56/60/-6/0.55/000/00 25 SSE TSTM 6/17 77/57/67/+1/0/587/64 25 S TSTM 6/18 71/52/62/-4/0.01/642/70 27 S 6/19 75/56/66/-1/0/752/82 23 S Aero 20 MPH S 6/20 78/57/68/+1/0.20/459/50 27 W TSTM 6/21 81/59/70/+3/0.00/826/90 25 SSE 6/22 80/61/71/+4/0.01/266/29 38 S Aero 37 MPH S 6/23 76/65/71/+3/0.02/009/01 23 S TSTM 6/24 77/58/68/0/0.15/.../.. 40 WNW Aero 39 MPH WNW TSTM 6/25 81/58/70/+2/0/.../.. 25 W Aero 24 MPH SW 6/26 79/62/71/+3/0.02/.../.. 31 S Aero 30 MPH S 6/27 morning low temp: 64F; our normal low is now 59F NEW DAILY RECORDS FOR JUNE TO DATE.... 6/8 - MINIMUM TEMPERATURE OF 72F EQUALED RECORD HIGH MINIMUM SET IN 1999. 6/9 - MAXIMUM TEMPERATURE OF 94F IS NEW RECORD FOR THE DATE, PREVIOUS RECORD 92F IN 1984 6/10 - MAXIMUM TEMPERATURE OF 98F IS NEW RECORD FOR THE DATE, PREVIOUS RECORD 92F IN 1967,1974,1984 MINIMUM TEMPERATURE OF 72F IS NEW RECORD HIGH MINIMUM FOR DATE, PREVIOUS RECORD WAS 71F IN 1984 6/11 - MINIMUM TEMPERATURE OF 68F EQUALED RECORD HIGH MINIMUM SET IN 1973, 1984. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR JUNE 27 HIGH 93F IN 1999, 2007 LOW 46F IN 1897 PRECIP 1.72 INS IN 1938 PEAK GUST 55e N IN 1945 RECORDS FOR JUNE 28 HIGH 95F IN 1991 LOW 47F IN 1970 PRECIP 2.09 INS IN 1938 PEAK GUST 52 MPH WSW IN 1993 TODAY'S REPORT PREPARED By: Stephanie Radner