Thursday, April 4, 2019

BLUE HILL METEOROLOGICAL OBSERVATORY
MILTON, MASSACHUSETTS
ELEVATION 635 FEET, 10 MILES SSW OF BOSTON, MA

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, APRIL 4, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

WINDY WITH VERY DRY CONDITIONS AND ABUNDANT
SUNSHINE ATOP GREAT BLUE HILL….

Wind has remained westerly with a peak gust so
far today around 45 mph. Average wind speed has
been at or exceeding 20 mph for the majority of
the day. Despite little to speak of in the way
of cloud cover, temperatures remain below normal
due to strong cold air advection from the west.
The high so far today is 48F, 3 degrees below
the daily normal maximum of 51F. The low since
midnight is 34F, a degree above the normal of 33F.

PRELIMINARY STATS FOR MARCH 2019

TEMPERATURE, Deg. F
Avg. Max. 44.0 [-0.3] Avg. Min. 26.1 [-0.5] Mean      35.1 [-0.4] 24-hour corrected mean: 34.7
Max. for month: 67F on the 30th
Min. for month: 6F  on the 7th

HEATING DEGREE DAYS
Total heating units:    919 [+3] Total for the season:  5405 [-79] Total for last season: 5058

PRECIPITATION, Inches
Total: 4.08 [-1.50] Greatest in 24 hrs: N/A

SNOWFALL, Inches
Total: 23.1 [+10.4] Greatest in 24 hrs: N/A

WIND, mph
Avg. uncorrected wind speed: 13.2
Avg. corrected wind speed: 13.5
Prevailing wind direction: W at 20%
Peak gust and direction: 53 S on 31st

SUNSHINE:
Campbell-Stokes card minutes: 12612 minutes of possible 21516 or 59%
Astronomical total minutes:   13031 minutes of possible 22220 or 59%

Today’s Observations:

7 A.M.
Weather: Clear, few cirrostratus NE-SW
Temperature: 36F; Dew Point: 13F; Wind: W at 17G26 kts,
Peak wind: 35 MPH (30 kts) W at 5:26 A.M.
Sea-level pressure: 30.26 ins. Hg, rising steadily
Visibility: 85 miles
6-hr Max temp: 38F
6-hr Min temp: 34F
24-hr Precip:  Trace
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 CLR 85 247/36/13/2817G26/026/ FEW CS NE-SW
PK WND 2830/1026/ 8/007 51028 10038 20034

10 A.M.
Weather: Clear, few distant cirrus E-S
Temperature: 45F; Dew Point: 11F; Wind: NW at 16G24 kts,
Peak wind: 37 MPH (32 kts) NW at 9:02 A.M.
Sea-level pressure: 30.27 ins. Hg, rising steadily
Visibility: 85 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 CLR 85 250/45/11/3116G24/027/ FEW DSNT CI
E-S PK WND 3032/02/ 8/001 53003

1 P.M.
Weather: Scattered cirrus
Temperature: 47F; Dew Point: 4F; Wind: W at 20G32 kts,
Peak wind: 43 MPH (37 kts) WNW @ 12:35 P.M.
Sea-level pressure: 30.26 ins. Hg, falling steadily
Visibility: 85 miles
6-hr Max temp: 48F
6-hr Min temp: 36F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
BHO SA 1755 250 SCT 85 247/47/4/3020G32/026/ PK WND 3037/35/
8/002 58003 10048 20036

SUMMARY FOR WEDNESDAY, APRIL 3, 2019

TEMPERATURE (DEGREES F)
MAX…..62   NORMAL…..51
MIN…..35   NORMAL…..33
MEAN….49   NORMAL…..42

DEPARTURE FROM 30-YEAR NORMAL…………………….+7
TOTAL DEPARTURE FOR THE MONTH…………………….+1 [+0.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..16   DEPARTURE………-7
TOTAL HEATING UNITS FOR THE MONTH…………..70   DEPARTURE………-1
TOTAL HEATING UNITS FOR THE SEASON………..5475   DEPARTURE……..-80
TOTAL HEATING UNITS LAST SEASON TO DATE……5134   DIFFERENCE……+341

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..54 W   AT 10:18 P.M.
AERO…………………….58 W   AT 10:30 P.M.
ASOS…………………….58 W   AT 10:18 P.M.
DAVIS……………………60 WSW AT 11:12 P.M.  RMY 56
FASTEST MILE FOR YESTERDAY………………….40 W   AT 10:20 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….36 WNW AT 11:14 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………39 W   AT 11:14 P.M.
AVERAGE WIND SPEED AND DIRECTION………….18.4 W
ASOS………………….17.5
DAVIS…………………18.3 W [281 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….Trace DEPARTURE…….-0.17
ASOS…………..0.01
TOTAL PRECIPITATION FOR THE MONTH……….0.44  DEPARTURE…….-0.07
ASOS…………..0.44
TOTAL PRECIPITATION FOR THE YEAR……….13.48  DEPARTURE…….-1.03
ASOS………….13.59

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.2
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE……..-0.6
TOTAL SNOWFALL FOR THE SEASON…………..47.6  DEPARTURE…….-12.7

PRELIMINARY CLIMATE SUMMARY FOR MARCH 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

03/01 38/17/28/-3/0.00/0.5/479/71           16 NNW AERO 13 NNW RMY 22
03/02 31/27/29/-2/0.48/3.7/000/00           29 NNE AERO 22 NNE RMY 30
03/03 40/25/33/+1/0.12/1.5/367/54           21 ESE AERO 14 ESE RMY N/A
03/04 35/18/27/-5/1.70/14.3/130/19          33 W   AERO 18 W   RMY 32
03/05 29/10/20/-12/0.00/0.0/664/97          28 WNW AERO 12 SW  RMY N/A
03/06 24/10/17/-15/0.00/0.0/667/97          40 WNW AERO 25 WNW RMY 41
03/07 26/6/16/-17/0.00/0.0/359/52           35 W   AERO 18 W   RMY 34
03/08 35/11/23/-10/0.00/0.0/555/80          23 WSW AERO M  M   RMY M
03/09 43/22/33/0/0.00/0.0/683/98            20 WSW AERO M  M   RMY N/A
03/10 40/26/33/0/0.53/1.0/000/00            32 ESE AERO 23 S   RMY 32
03/11 48/33/41/+7/0.00/0.0/555/79           40 NW  AERO 37 NNW RMY 41
03/12 41/27/34/0/0.00/0.0/494/70            32 N   AERO 33 N   RMY 34
03/13 43/24/34/0/0.00/0.0/404/57            18 W   AERO 21 W   RMY 23
03/14 48/32/40/0/0.00/0.0/121/17            25 S   AERO 28 S   RMY M
03/15 58/40/49/+14/0.12/0.0/000/00          37 SSW AERO 38 SSW RMY 39
03/16 50/31/41/+6/0.00/0.0/695/97           45 W   AERO 46 W   RMY 48
03/17 40/26/33/-3/0.00/0.0/590/82           40 WNW AERO M  M   RMY N/A
03/18 41/22/32/-4/0.00/0.0/694/96           29 W   AERO M  M   RMY 30
03/19 44/25/35/-1/0.00/0.0/587/81           25 W   AERO M  M   RMY N/A
03/20 50/27/39/+2/0.00/0.0/684/94           26 S   AERO M  M   RMY 29
03/21 50/33/42/+5/0.02/0.0/227/31           25 SSE AERO M  M   RMY 46
03/22 39/34/37/0/0.86/T/000/00              40 W   AERO M  M   RMY 44
03/23 45/28/37/-1/0.12/2.1/523/71           45 WNW AERO M  M   RMY 50
03/24 56/29/43/+5/0.00/0.0/437/59           28 W   AERO M  M   RMY 30
03/25 49/32/41/+3/0.00/0.0/468/63           25 NNW AERO M  M   RMY N/A
03/26 43/27/35/-4/0.00/0.0/716/96           28 NW  AERO M  M   RMY 28
03/27 42/24/33/-6/0.00/0.0/703/94           21 S   AERO M  M   RMY 23
03/28 51/28/40/+1/0.00/0.0/623/83           35 S   AERO M  M   RMY 37
03/29 53/40/47/+7/0.02/0.0/000/00           26 SSW AERO M  M   RMY 27
03/30 67/40/54/+14/0.00/0.0/477/63          44 S   AERO M  M   RMY 46
03/31 65/34/50/+9/0.10/0.0/129/17           53 S   AERO 52 S   RMY 55

PRELIMINARY CLIMATE SUMMARY FOR MARCH 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

04/01 45/29/37/-4/0.00/0.0/…/..           40 WNW AERO 37 W   RMY 42
04/02 50/27/39/-2/…./…/…/..           29 S   AERO 25 S   RMY 31
04/03 62/35/49/+7/…./…/…/.. 54 W AERO 58 W RMY 56

04/04 Low temp since midnight is 34F; normal low is 33F

DAILY EXTREMES
Temperature and precipitation records back to 1885, and
wind records back to 1940 (e = estimated):

RECORDS FOR APRIL 4
HIGH 76 IN 2010
LOW 12 IN 1954
PRECIP 1.45 IN. IN 1987
SNOWFALL 7.3 IN. IN 2016
PEAK GUST 80 MPH WNW IN 1963

RECORDS FOR APRIL 5
HIGH 81 IN 1928
LOW 15 IN 1995
PRECIP 2.15 IN. IN 1987
SNOWFALL 4.0 IN. IN 1898
PEAK GUST 76 MPH WNW IN 1963

TODAY’S REPORT PREPARED BY: Benjamin Turner