Tuesday, April 24, 2018
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, APRIL 24, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME
AN ABOVE SEASONABLE DAY WITH GOOD VISIBILITY AND
HIGH CLOUDS….
High pressure and dry air has continued to bring
good visibility, which stayed at 70 miles the whole
day. The weather remained fair with some high clouds.
Temperatures rose rapidly since this morning, increasing
from 47F to 67F by the 1:00 A.M. observation. This is
8 degrees above the daily normal maximum of 59F. The
low since midnight was 39F, 2 degrees below the daily
normal of 41F.
Today’s Observations:
7 A.M.
Weather: Broken cirrus
Temperature: 47F; Dew Point: 35F; Wind: SSW at 9G12 kts
Sea-level pressure: 30.42 ins. Hg, rising, then more slowly
Visibility: 70 miles, thin smoke layer along the horizon in
all directions
6-hr Max temp: 47F
6-hr Min temp: 39F
24-hr precip: 0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 E250 BKN 70 300/47/35/2109G12/042/ THN K LYR ALNG
HRZN ALQDS/ 8/002 53007 10047 20039
10 A.M.
Weather: Broken cirrus
Temperature: 61F; Dew Point: 27F; Wind: SSW at 8G14 kts
Sea-level pressure: 30.41 ins. Hg, rising then steady
Visibility: 70 miles
3-hr precip: 0.00 ins.
3-hr snowfall: 0.0 ins.
BHO SA 1455 E250 BKN 70 297/61/27/2108G14/041/ 8/002 58003
1 P.M.
Weather: Scattered cirrus and cirrostratus, few cirrocumulus
overhead
Temperature: 67F; Dew Point: 32F; Wind: SSW at 14G22 kts
Sea-level pressure: 30.34 ins. Hg, falling, then more slowly
Visibility: 70 miles
6-hr Max temp: 67F
6-hr Min temp: 47F
6-hr precip: 0.00 ins.
6-hr snowfall: 0.00 ins.
Snow depth: 0 ins.
BHO SA 1755 250 SCT 70 273/67/32/2014G22/034/ FEW CC OVHD/
8/005 56024 10067 20047
SUMMARY FOR MONDAY, APRIL 23, 2018
TEMPERATURE (DEGREES F)
MAX…..62 NORMAL…..59
MIN…..40 NORMAL…..41
MEAN….51 NORMAL…..50
DEPARTURE FROM 30-YEAR NORMAL………………………+1
TOTAL DEPARTURE FOR THE MONTH……………………..-94 [-4.3 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….14 DEPARTURE……….-1
TOTAL HEATING UNITS FOR THE MONTH…………545 DEPARTURE………+92
TOTAL HEATING UNITS FOR THE SEASON……….5603 DEPARTURE……..-333
TOTAL HEATING UNITS LAST SEASON TO DATE…..5274 DIFFERENCE…….+329
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….25 S AT 7:40 P.M.
AERO……………………25 S AT 7:38 P.M.
ASOS……………………27 SSW AT 7:59 P.M.
DAVIS…………………..29 M AT 7:41 P.M.** RMY 26
FASTEST MILE FOR YESTERDAY…………………20 SSW AT 10:56 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE………………21 SSW AT 10:54 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..22 M AT 7:42 P.M.**
AVERAGE WIND SPEED AND DIRECTION…………..10.0 NW
ASOS…………………..10.4
DAVIS………………….9.8 M **
** Davis direction malfunctioning
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00 DEPARTURE……-0.14
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….4.32 DEPARTURE……+0.69
ASOS…………..4.48
TOTAL PRECIPITATION FOR THE YEAR……….23.12 DEPARTURE……+5.67
ASOS………….24.72
SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0 DEPARTURE………0.0
TOTAL SNOWFALL FOR THE MONTH…………….2.6 DEPARTURE……..-0.2
TOTAL SNOWFALL FOR THE SEASON…………..92.8 DEPARTURE…….+30.2
PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/PEAK GUST/AERO/RMY GUST
AERO: Aerovane wind recording system gust
RMY : R.M. Young wind gust recording system
TSTM: Thunderstorm day (thunder heard some time during day)
….: Data not yet available, records not finalized
M : Missing data
* : Estimated data
4/01 58/33/46/+5/0.00/0.0/336/44 45 SSW AERO 43 SSW RMY N/A
4/02 38/30/34/-7/0.13/1.6/077/10 20 SSW AERO 15 SSW RMY 17
4/03 48/30/39/-3/…./0.0/238/31 28 SSE AERO 25 SSE RMY 25
4/04 54/36/45/+3/…./0.0/000/00 56 WNW AERO 56 WNW RMY 54
4/05 40/27/34/-9/0.00/0.0/760/98 53 WNW AERO 53 WNW RMY 52
4/06 41/25/33/-10/0.25/1.0/156/20 37 S AERO 36 S RMY 38
4/07 46/32/35/-4/0.00/0.0/312/40 32 WNW AERO 35 WNW RMY 34
4/08 41/29/35/-9/0.00/0.0/290/37 35 WNW*AERO 31 WNW RMY 34
4/09 45/24/35/-9/0.00/0.0/715/01 28 WNW*AERO 25 WNW RMY 29
4/10 39/31/35/-10/T/T/000/00 14 SSW AERO 13 SSW RMY N/A
4/11 48/29/39/-6/T/0.0/364/46 24 SSE AERO 23 SSE RMY 25
4/12 61/33/47/+2/0.03/0.0/…/.. 39 SSW AERO 38 SSW RMY 41
4/13 65/47/56/+10/T/0.0/…/.. 37 SSW AERO 37 SSW RMY N/A
4/14 51/36/44/-2/0.00/0.0/…/.. 33 ENE AERO 31 ENE RMY N/A
4/15 36/30/33/-14/…./T/…/.. 39 ENE AERO 39 ENE RMY N/A
4/16 55/32/44/-3/…./…/.. 41 ENE AERO 43 ENE RMY 41
4/17 48/36/42/-5/0.00/0.0/…/.. 37 W AERO 33 W RMY 37
4/18 53/32/43/-5/…./0.0/…/.. 35 W AERO 31 W RMY 34
4/19 41/34/38/-10/0.22/T/…/.. 28 WNW AERO 25 WNW RMY N/A
4/20 52/31/42/-7/0.00/0.0/…/.. 34 NW AERO 33 NW RMY 36
4/21 60/33/47/-2/0.00/0.0/…/.. 28 NW AERO 26 NW RMY 29
4/22 61/36/49/0/0.00/0.0/…/.. 25 NW AERO 24 NW RMY 26
4/23 62/40/51/+1/0.00/0.0/…/.. 25 S AERO 25 S RMY 26
4/24 Low temp since midnight is 39F; normal low is now 41F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR APRIL 24
HIGH 82 IN 2001
LOW 22 IN 1930
PRECIP 2.51 INS IN 1898
SNOWFALL 1.2 INS IN 1967
PEAK GUST 59 MPH NW IN 1962
RECORDS FOR APRIL 25
HIGH 83 IN 2009
LOW 24 IN 1892
PRECIP 1.38 IN. IN 1901
SNOWFALL 0.7 IN. IN 2002.
PEAK GUST 66 MPH SE IN 1968
TODAY’S REPORT PREPARED BY: Benjamin Turner
