Saturday, April 27, 2024

BLUE HILL METEOROLOGICAL OBSERVATORY MILTON, MASSACHUSETTS ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA SATURDAY, APRIL 27, 2024 ALL TIMES ARE IN EASTERN STANDARD TIME (EST) SUNRISE: 0444E SUNSET:  1840E INCREASING CIRRUS COVERAGE AND WARMER…. It has been a gorgeous day up here on the hill so far! Warm temperatures combined with some filtered sunshine and light winds have made for a great day to enjoy the outdoors. Cloud coverage has increased as the day has progressed, with cirrus filling much of the sky by late morning. Otherwise, there is not much of note weather-wise! It was chilly to start this morning, as we began in the upper 30s. Temperatures quickly rose following sunrise, and we have made it to the mid 60s by early afternoon, which is just a touch above normal for this time of year. The air mass remains dry, as the dew point has slowly fallen from the mid to lower 30s. Winds have been quite light all day, with a measly average of only 8mph. The peak gust occurred early this morning, but was only about 21mph. Visibility has been fairly good so far. Despite the dry air mass, our views today have only reached 50-60 miles, mostly because of haziness. The maximum temperature so far today is 65F degrees, which is 4 degrees above the normal high of 61F. The minimum temperature since midnight is 37F degrees, which is 5 degrees below the normal low of 42F. ————————————————————– Today’s Observations: 7 A.M. Weather: Clear, few cirrus distant SSW-W-NW Temperature: 42F; Dew Point: 36F; Relative Humidity: 78% Wind: WSW @ 5 kts, wind light Sea-level pressure: 1034.3 mb; 30.54 in. Hg: rising, then more slowly Visibility: 50 miles, hazy 6-hr Max temp: 42F 6-hr Min temp: 37F 24-hr Precip:  0.00 inches 24-hr Snowfall: 0.0 inches Snow Depth: 0 inches BHO SA 1155 CLR 50 343/42/36/2405/054/ FEW CI DSNT SSW-W-NW HAZY WND LGT/ 8/001 51013 10042 20037 10 A.M. Weather: Thin broken cirrus Temperature: 56F; Dew Point: 34F; Relative Humidity: 42% Wind: WSW @ 4 kts, wind light and variable Sea-level pressure: 1033.5 mb; 30.52 in. Hg: falling, then more slowly Visibility: 50 miles, hazy 3-hr Precip:  0.00 inches 3-hr Snowfall: 0.0 inches BHO SA 1455 E250 -BKN 50 335/56/34/2504/052/ HAZY WND L/V/ 8/004 56008 1 P.M. Weather: Thin broken cirrus, few cumulus distant N-NNE and E-SE Temperature: 64F; Dew Point: 31F; Relative Humidity: 28% Wind: SSW @ 6 kts, wind light and variable Sea-level pressure: 1030.7 mb; 30.44 in. Hg: falling unsteadily Visibility: 60 miles, hazy 6-hr Max temp: 65F 6-hr Min temp: 42F 6-hr Precip:  0.00 inches 6-hr Snowfall: 0.0 inches Snow Depth: 0 inches BHO SA 1755 E250 -BKN 60 307/64/31/2006/044/ FEW CU DSNT N-NNE AND DSNT E-SE HAZY WND L/V/ 8/104 57028 10065 20042 ————————————————————– SUMMARY FOR FRIDAY, APRIL 26, 2024 TEMPERATURE (DEGREES F) MAX…….56   NORMAL…..61 MIN…….32   NORMAL…..42 MEAN……44   NORMAL…..52 DEPARTURE FROM 30-YEAR (1991-2020) NORMAL………….-8 TOTAL DEPARTURE FOR THE MONTH…………………….+9 [+0.1 DEGREES/DAY] HEATING DEGREE DAYS (SEASON: JUL 2023 THRU JUN 2024) TOTAL HEATING UNITS FOR YESTERDAY……………21  DEPARTURE……..+7 TOTAL HEATING UNITS FOR THE MONTH…………..487  DEPARTURE……..-2 TOTAL HEATING UNITS FOR THE SEASON…………5128  DEPARTURE……-707 TOTAL HEATING UNITS LAST SEASON TO DATE…….4916  DEPARTURE……+212 PEAK WIND GUST (MPH): Note: Instruments designated #1 = Main Tower, #2 = South Tower, F420C, Contacting, Merlin, and Richards are all Main Tower. E=Estimated F420C (Official)……….E25 S    @  06:47 P.M. VECTOR #1 (1-Sec)……….24 S    @  07:06 P.M. VECTOR #2 (1-Sec)……….24 S    @  06:41 P.M. DAVIS #1……………….26 S    @  06:47 P.M. DAVIS #2 ………………30 S    @  06:41 P.M. RMY #1 (Instantaneous)…..24 S    @  07:06 P.M. RMY #2 (Instantaneous)…..26 S    @  06:41 P.M. MERLIN…………………21 RICHARDS (C5C) (Inst)……22      @  07:06 P.M. FASTEST MILE: CONTACTING ANEMOMETER/OFFICIAL………………18 S    @  06:48 P.M. MAXIMUM 2-MINUTE VECTOR #1 AVERAGE…………..18      @  06:48 P.M. MAXIMUM 2-MINUTE VECTOR #2 AVERAGE…………..19      @  06:48 P.M. MAXIMUM 2-MINUTE DAVIS #1 AVERAGE……………18 S    @  06:48 P.M. MAXIMUM 2-MINUTE DAVIS #2 AVERAGE……………23 S    @  06:48 P.M. MAXIMUM 2-MINUTE RMY #1 AVERAGE……………..17 S    @  06:48 P.M. MAXIMUM 2-MINUTE RMY #2 AVERAGE……………..20 S    @  06:48 P.M. MAXIMUM 2-MINUTE RICHARDS (C5C) AVERAGE………17      @  06:48 P.M. AVERAGE WIND SPEED AND DIRECTION: CONTACTING/OFFICIAL…….9.4 ENE [226 total miles] VECTOR #1……………..9.6 VECTOR #2…………….10.4 DAVIS #1………………9.7 SSE DAVIS #2………………9.9 SSE RMY #1………………..9.4 SSE RMY #2………………..9.8 SE RICHARDS (C5C)…………9.8 PRECIPITATION (INCHES) THROUGH THIS MORNING (EST): TOTAL PRECIPITATION 24 HRS ENDING 7 A.M……..0.00 DEPARTURE…..-0.15 TOTAL PRECIPITATION FOR THE MONTH…………..4.30 DEPARTURE…..+0.12 TOTAL PRECIPITATION FOR THE YEAR (2024)…….24.35 DEPARTURE…..+6.15 SNOWFALL (INCHES) THROUGH THIS MORNING (EST): TOTAL SNOWFALL 24 HRS ENDING 7 A.M…………..0.0 DEPARTURE…….0.0 TOTAL SNOWFALL FOR THE MONTH………………..0.7 DEPARTURE……-2.0 TOTAL SNOWFALL FOR THE SEASON (2023-2024)……26.8 DEPARTURE…..-42.8 ————————————————————– PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN)/SUN(%)/PEAK GUST/VEC1/RMY GUST PEAK GUST: F420C (Official) VEC1: Vector #1 1-second gust RMY:  R.M. Young #1 wind gust recording system (Instantaneous) TSTM: Thunderstorm day (thunder heard some time during day) ….: Data not yet available, records not finalized M:    Missing data DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) 4/1   56/40/48/+7/0.00/0.0/153/20         20 SSE VEC1 20 SSE RMY 19 4/2   47/35/41/0/0.07/0.0/115/15          25 E   VEC1 25 E   RMY 25 4/3   41/34/38/-4/1.10/T/000/00           53 E   VEC1 53 E   RMY 53 4/4   36/32/34/-8/1.25/0.7/000/00         63 ENE VEC1 64 ENE RMY 68 4/5   45/31/38/-5/0.01/T/147/19           33 WNW VEC1 31 WNW RMY 33 4/6   43/33/38/-5/0.08/093/12             35 N   VEC1 35 N   RMY 35 4/7   48/34/41/-3/T/0.0/094/12            32 N   VEC1 31 N   RMY 31 4/8   66/36/51/+7/0.00/0.0/636/81         23 WNW VEC1 23 WNW RMY 22 4/9   63/40/52/+8/0.00/0.0/741/94         22 ENE VEC1 21 ENE RMY 21 4/10  65/38/52/+7/T/0.0/348/44            26 S   VEC1 26 S   RMY 30 4/11  55/42/49/+4/0.04/0.0/000/00         32 SSE VEC1 32 SSE RMY 31 4/12  60/46/53/+7/1.03/0.0/032/04         62 SSE VEC1 62 S   RMY 63 4/13  54/43/49/+3/T/0.0/271/34            43 W   VEC1 42 WNW RMY 46 4/14  58/42/50/+3/0.09/0.0/384/48         33 WSW VEC1 33 WSW RMY 35 4/15  73/43/58/+11/T/0.0/764/95           33 NW  VEC1 33 NW  RMY 34 4/16  68/44/56/+9/0.00/0.0/759/94         29 NW  VEC1 28 NW  RMY 29 4/17  60/40/50/+2/0.00/0.0/656/81         25 ESE VEC1 24 ESE RMY 24 4/18  47/40/44/-4/0.21/0.0/000/00         25 E   VEC1 25 E   RMY 23 4/19  60/41/51/+2/T/0.0/399/49            29 S   VEC1 29 S   RMY 29 4/20  57/40/49/0/0.38/0.0/082/10          34 WNW VEC1 37 WNW RMY 39 4/21  50/34/42/-8/0.00/0.0/295/36         30 NW  VEC1 30 WNW RMY 31 4/22  57/34/46/-4/0.00/0.0/822/100        29 NW  VEC1 29 NW  RMY 29 4/23  63/37/50/0/0.00/0.0/710/86          30 S   VEC1 29 S   RMY 29 4/24  63/33/48/-3/0.04/0.0/265/32         52 WNW VEC1 51 WNW RMY 58 4/25  55/29/42/-9/0.00/0.0/831/100        28 SE  VEC1 28 SE  RMY 26 4/26  56/32/44/-8/0.00/0.0/…/..         25 S   VEC1 24 S   RMY 24 4/27 The low since midnight is 37F, the daily normal low is 42F. ————————————————————– APRIL DAILY RECORDS TO DATE NONE… ————————————————————– DAILY EXTREMES Temperature and precipitation records back to 1885, and wind records back to 1940 (e = estimated) RECORDS FOR APRIL 27 HIGH 93 IN 1990 LOW 28 IN 1919 PRECIP 1.89 IN 1979 SNOWFALL 2.7 IN. IN 1993 PEAK GUST 65e MPH N IN 1941 RECORDS FOR APRIL 28 HIGH 92 IN 1990, 2009 LOW 26 IN 1947 PRECIP 2.41 IN 1904 SNOWFALL 10.0 IN. IN 1987 PEAK GUST 69 MPH NE 1967 TODAY’S REPORT PREPARED BY: Joshua Polen