Thursday, April 26, 2018
BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA
DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 26, 2018
ALL TIMES ARE IN EASTERN STANDARD TIME
PRESSURE INCREASES, RAIN STOPS, AND SKY BEGINS
TO CLEAR…
Rain continued overnight and ended this morning
around 9:15 A.M. Overall we measured a storm total
of 1.22 ins. during this event. Visibility was
limited to 1/2 mile during the 7:00 A.M. observation,
due to fog in the area. The fog dissipated after
the rain stopped and visibility greatly increased
to 80 miles by 1:00 P.M. With the increase in
visibility was also saw a huge decrease in humidity
from 100% in the morning down to 48% at 1:00 P.M.
Pressure increased this afternoon which caused
the wind to pick up. We also observed a shift in the
wind today from the SE to the W.
So far today temperatures have been above seasonable.
Overnight we didn’t have a large deviation in temps.
due to the high humidity. Since midnight we have
had a low of 54F, which is 12 degrees above the
daily normal of 42F. So far we reached a max today
of 65F, which is already 5 degrees above the daily
normal of 60F.
Today’s Observations:
7 A.M.
Weather: Very light drizzle and fog
Temperature: 54F; Dew Point: 54F; Wind: SSW at 9 kts
Sea-level pressure: 29.59 ins. Hg, falling then rising
Visibility: 1/2 mile
6-hr Max temp: 55F
6-hr Min temp: 54F
24-hr precip: 1.17 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 W3 X 1/2L-F 021/54/54/2009/959/ PCPN VRY LGT/
8//// 53003 MANUAL 70117 ASOS 70120 10055 20054
10 A.M.
Weather: Broken stratus fractus, broken stratus, broken
stratocumulus
Temperature: 58F; Dew Point: 56F; Wind: W at 9 kts
Sea-level pressure: 29.59 ins. Hg, steady then rising
Visibility: 60 miles, distant fog in all directions
3-hr precip: Trace
3-hr snowfall: 0.0 ins.
BHO SA 1455 E10 BKN 15 BKN 25 BKN 60 021/58/56/2809/959/
DSNT FG ALQDS/ 8/6// 55000 MANUAL 600//
1 P.M.
Weather: Scattered cumulus, broken stratocumulus
Temperature: 65F; Dew Point: 45F; Wind: W at 16G28 kts,
Peak Wind: 28 kts (32 MPH) W at 12:53 P.M.
Sea-level pressure: 29.62 ins. Hg, rising, then more slowly
Visibility: 80 miles
6-hr Max temp: 65F
6-hr Min temp: 54F
6-hr precip: Trace
6-hr snowfall: 0.00 ins.
Snow depth: 0 ins.
BHO SA 1755 40 SCT E50 BKN 80 030/65/45/2616G28/962/
PK WND 2628/53/ 8/800 51009 MANUAL 600// 10065 20054
SUMMARY FOR WEDNESDAY, APRIL 25, 2018
TEMPERATURE (DEGREES F)
MAX…..57 NORMAL…..60
MIN…..47 NORMAL…..41
MEAN….52 NORMAL…..50
DEPARTURE FROM 30-YEAR NORMAL………………………+2
TOTAL DEPARTURE FOR THE MONTH……………………..-89 [-3.8 DEGREES/DAY]
HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY………….13 DEPARTURE……….-2
TOTAL HEATING UNITS FOR THE MONTH…………570 DEPARTURE………+87
TOTAL HEATING UNITS FOR THE SEASON……….5628 DEPARTURE……..-338
TOTAL HEATING UNITS LAST SEASON TO DATE…..5302 DIFFERENCE…….+326
PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY……………….32 SE AT 2:14 P.M.*
AERO……………………32 SE AT 1:13 P.M.
ASOS……………………32 SE AT 2:30 P.M.
DAVIS…………………..33 M AT 2:31 P.M.** RMY 32
FASTEST MILE FOR YESTERDAY…………………24 SE AT 2:30 P.M.*
MAXIMUM 2-MINUTE ASOS AVERAGE………………22 SE AT 2:32 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE……………..24 M AT 2:32 P.M.**
AVERAGE WIND SPEED AND DIRECTION………….14.2 SE
ASOS………………….13.9
DAVIS…………………13.7 M **
* Last of multiple occurrences
** Davis direction malfunctioning
PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….1.17 DEPARTURE……+1.04
ASOS…………..1.20
TOTAL PRECIPITATION FOR THE MONTH……….5.54 DEPARTURE……+1.65
ASOS…………..5.73
TOTAL PRECIPITATION FOR THE YEAR……….24.34 DEPARTURE……+6.63
ASOS………….25.97
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……..-0.3
TOTAL SNOWFALL FOR THE SEASON…………..92.8 DEPARTURE…….+30.1
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 67/39/53/+3/0.00/0.0/…/.. 31 S AERO 29 S RMY 32
4/25 57/47/52/+2/…./0.0/…/.. 32 SE AERO 32 SE RMY 33
4/26 Low temp since midnight is 54F; normal low is now 42F
DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):
RECORDS FOR APRIL 26
HIGH 88 IN 2009
LOW 23 IN 1919
PRECIP 1.64 IN. IN 1931
SNOWFALL 1.0 IN. IN 2000
PEAK GUST 53 MPH SSW IN 1996
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
TODAY’S REPORT PREPARED BY: Kaitlin Geagan
