BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS 02186 ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA DAILY DISCUSSION AND CLIMATE SUMMARY TUESDAY, MAY 27, 2008 ALL TIMES ARE IN EASTERN STANDARD TIME UNLESS NOTED YESTERDAY WAS WINDIEST DAY SINCE APRIL 2ND WINDS FROM THE S-SSW WITH GUSTS OVER 40 MPH TEMPS. REACH 80'S TODAY, WARMEST SINCE APRIL An average wind speed of 21 MPH yesterday from the south made it our windiest day since 23 MPH on April 2nd. Our peak wind gusts reached over 40 MPH and ASOS had 43 MPH while the manual system had 42 MPH. One of our other unofficial recorders had 46 MPH. Today's high temperatures have made it to 80 degrees along with the first summer-time type humidity. The dewpoints have climbed into the low 60's. Tops of cumulonimbus clouds within a squall line approaching from the west can be seen as anvil-type cirrus to the west through north early this afternoon. Today's observations: 8 A.M. EDT Weather: Overcast altostratus, dense cirrus, break in overcast to the NW [a line of clearing] Temperature: 60F, Dew point: 57F, Wind: S at 14 kts Sea-level pressure: 29.84 inches Hg, steady Visibility: 6 miles, thin fog 6-hourly minimum temperature: 59F 6-hourly rainfall: 0.01 in. 24-hourly rainfall: 0.01 in. BHO SA 1155 E150 BKN 200 OVC 6F 104/60/57/1714/984/ FEW SC DSNT ESE-S DENS CI OVHD-NW BINOVC/LINE OF CLRG WNW-NNW VSBY N 8/ 8/522 51008 ASOS 60001 MANUAL 6001/ ASOS 70001 MANUAL 70001 10060 20059 11 A.M. EDT Weather: Clear, altocumulus layer E-S receding Temperature: 71F, Dew point: 62F, Wind: S at 12 kts Sea-level pressure: 29.83 inches Hg, falling Visibility: 12 miles, hazy BHO SA 1455 CLR 12 101/71/62/1812/983/ AC LYR E-S RCDNG HAZY/ 8/030 58003 2 P.M. EDT Weather: Scattered cumulus, cumulonimbus anvil tops WNW-NNW Temperature: 79F, Dew point: 62F, Wind: S at 17G26 kts Wind: peak gust from south at 28 kts @ 44 past the hour Wind: direction variability SE-SSW Sea-level pressure: 29.79 inches Hg, falling Visibility: 25 miles, hazy 6-hourly maximum temperature: 80F BHO SA 1755 50 SCT 200 SCT 25 087/79/62/1717G26/979/ CB ANVIL TOPS WNW-NNW TCU DSNT W-N HAZY PK WND 1728/44/ WND 14V21/ 8/203 58014 10080 20060 WEATHER SUMMARY FOR MONDAY, MAY 26 MEMORIAL DAY TEMPERATURE (DEGREES F) MAX.....78 NORMAL.....70 MIN.....52 NORMAL.....50 MEAN....65 NORMAL.....60 DEPARTURE FROM 30-YEAR NORMAL............+5 TOTAL DEPARTURE FOR THE MONTH...........-46 [-2.0 DEGREES/DAY] HEATING DEGREE DAYS TOTAL HEATING UNITS FOR YESTERDAY.............0 DEPARTURE........-6 TOTAL HEATING UNITS FOR THE MONTH...........275 DEPARTURE.......+25 TOTAL HEATING UNITS FOR THE SEASON.........5886 DEPARTURE......-384 TOTAL HEATING UNITS LAST SEASON TO DATE....5828 DIFFERENCE......+58 PEAK GUST AND AVERAGE WIND SPEED (MPH) PEAK WIND GUST FOR YESTERDAY............42 S AT 3:43 P.M. * AEROVANE............ 42 S AT 3:43 P.M. * ASOS.................43 S AT 3:43 P.M. DAVIS................46 S AT 2:31 P.M. FASTEST MILE FOR YESTERDAY..............34 S AT 3:43 P.M. * MAXIMUM 2-MINUTE ASOS AVERAGE...........33 S AT 3:44 P.M. MAXIMUM 2-MINUTE DAVIS AVERAGE..........38 SSW AT 2:32 P.M. AVERAGE............21.1 S ASOS...............20.4 DAVIS..............19.0 S [190 deg] * last of several occurrences. PRECIPITATION (INCHES) THROUGH THIS MORNING (EST) TOTAL PRECIPITATION 24 HRS ENDING 7 A.M....0.01 DEPARTURE......-0.11 ASOS..............0.01 TOTAL PRECIPITATION FOR THE MONTH..........1.68 DEPARTURE......-1.49 ASOS..............1.59 TOTAL PRECIPITATION FOR THE YEAR..........22.44 DEPARTURE......+1.32 ASOS.............24.82 # # Includes erroneous ASOS precipitation data on 2/13/08. PRELIMINARY CLIMATE SUMMARY FOR MAY 2008 CALENDAR DAY DATA DATA REPORTED: DATE: MAX/MIN/MEAN/DEP/PRECIP/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO GUST AERO: Aerovane recording wind system when significant TSTM: Thunderstorm day ....: Data not yet available, records not finalized 5/1 60/35/48/-4/0/786/93 30 W Aero 28 MPH W 5/2 48/42/45/-7/0.07/000/00 21 ENE 5/3 43/41/42/-11/0.09/000/00 25 E 5/4 50/42/46/-7/0.17/000/00 27 E 5/5 69/40/55/+2/0/752/88 24 ESE 5/6 74/46/60/+6/0/686/80 25 W 5/7 75/48/62/+8/0/722/84 29 S 5/8 75/54/65/+11/0.08/172/20 42 W Aero 42 MPH W 5/9 56/43/50/-5/0.26/000/00 30 NE 5/10 57/44/51/-4/T/407/47 35 NNE 5/11 58/41/50/-5/0/747/86 24 ENE 5/12 47/42/45/-11/0/017/02 43 NNE Aero 43 MPH NNE 5/13 63/43/53/-3/0/812/93 47 NNE Aero 50 MPH NNE 5/14 64/47/56/-1/0/788/90 23 ENE 5/15 67/47/57/0/T/009/01 22 S 5/16 59/45/52/-5/0.49/009/01 21 ENE 5/17 72/46/59/+2/0.47/449/51 33 W 5/18 71/50/61/+3/0.02/494/56 30 S 5/19 59/44/52/-6/0/566/64 46 W Aero 44 MPH W 5/20 64/42/53/-5/0.01/461/52 29 S 5/21 69/46/58/-1/T/524/59 35 WSW Aero 32 MPH WSW 5/22 58/45/52/-7/0.01/089/10 26 WSW 5/23 70/43/57/-2/T/749/84 41 W Aero 40 MPH W 5/24 69/47/58/-2/T/456/51 32 WNW 5/25 75/50/63/+3/0/.../.. 29 SE 5/26 78/52/65/+5/T/.../.. 42 S 5/27 morning low temp. 59F; our normal low is now 50F morning rainfall: 0.01 in. NEW DAILY RECORDS FOR MAY 2008 None to date. DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated): RECORDS FOR MAY 27 HIGH 92F IN 1914 LOW 36F IN 1915 PRECIP 1.40 INS IN 1898 PEAK GUST 55 S IN 1956 RECORDS FOR MAY 28 HIGH 90F IN 1929 LOW 39F IN 1917 PRECIP 2.48 INS 1906 PEAK GUST 51e MPH NE IN 1946 TODAY'S REPORT PREPARED By: Robert Skilling