Wednesday, April 3, 2019

| April 3, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, APRIL 3, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

WARMER THAN NORMAL AND SUNNY FOLLOWING
OVERNIGHT RAINFALL….

Today we observed light rain and fog this morning
that quickly dissipated following the 7 A.M.
observation. Overnight rainfall left a total of
0.44 inches of liquid precipitation in the gauge.
Visibility improved significantly by 10 A.M.,
with 75 miles being seen. Wind shifted from
east to west since this morning, and became
strong following the 1 P.M. A peak gust of
48 mph was measured around 3:55 P.M. Despite
the westerly flow, temperatures rose to a
high of 60F. This is 9 degrees above the
daily normal maximum of 51F. The overnight
low only reached 35F, 2 degrees above the
normal minimum 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: 35.4
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: Light rain, overcast nimbostratus, few
stratus fractus
Temperature: 35F; Dew Point: 35F; Wind: NW at 13G24 kts
Sea-level pressure: 29.89 ins. Hg, falling steadily
Visibility: 3 miles, fog
6-hr Max temp: 36F
6-hr Min temp: 35F
24-hr Precip:  0.44 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 E65 OVC 3R-F 121/35/35/3413G24/989/
FEW STFA ALQDS/ 8/72/ 70044 56023 10036 20035

10 A.M.
Weather: Broken cumulus, broken cirrus
Temperature: 41F; Dew Point: 38F; Wind: NW at 8G14 kts
Sea-level pressure: 29.87 ins. Hg, falling steadily
Visibility: 75 miles
3-hr Precip: Trace
BHO SA 1455 E40 BKN 250 BKN 75 114/41/38/3308G14/987/
8/802 600// 58007

1 P.M.
Weather: Scattered cumulus, few cirrostratus E-S
Temperature: 56F; Dew Point: 31F; Wind: W at 10G17 kts
Sea-level pressure: 29.82 ins. Hg, falling steadily
Visibility: 70 miles
6-hr Max temp: 56F
6-hr Min temp: 35F
6-hr Precip: Trace
6-hr snowfall: 0.0 ins.
BHO SA 1755 40 SCT 70 098/56/31/2710G17/982/
FEW CS E-S/ 8/105 600// 58016 10056 20035

SUMMARY FOR TUESDAY, APRIL 2, 2019

TEMPERATURE (DEGREES F)
MAX…..50   NORMAL…..50
MIN…..27   NORMAL…..33
MEAN….39   NORMAL…..41

DEPARTURE FROM 30-YEAR NORMAL…………………….-2
TOTAL DEPARTURE FOR THE MONTH…………………….-6 [-3.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..26   DEPARTURE………+2
TOTAL HEATING UNITS FOR THE MONTH…………..54   DEPARTURE………+6
TOTAL HEATING UNITS FOR THE SEASON………..5459   DEPARTURE……..-73
TOTAL HEATING UNITS LAST SEASON TO DATE……5108   DIFFERENCE……+351

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..29 S   AT  3:21 P.M.
AERO…………………….25 S   AT  2:09 P.M.
ASOS…………………….30 S   AT  3:21 P.M.
DAVIS……………………34 S   AT  3:41 P.M.  RMY 31
FASTEST MILE FOR YESTERDAY………………….24 S   AT  4:12 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….23 S   AT  4:12 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………25 S   AT  4:12 P.M.
AVERAGE WIND SPEED AND DIRECTION………….10.0 S
ASOS………………….10.0
DAVIS…………………10.3 SSE [167 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.44  DEPARTURE…….+0.27
ASOS…………..0.43
TOTAL PRECIPITATION FOR THE MONTH……….0.44  DEPARTURE…….+0.10
ASOS…………..0.43
TOTAL PRECIPITATION FOR THE YEAR……….13.48  DEPARTURE…….-0.86
ASOS………….13.58

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……..-0.4
TOTAL SNOWFALL FOR THE SEASON…………..47.6  DEPARTURE…….-12.5

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/…./…/479/71           16 NNW AERO 13 NNW RMY 22
03/02 31/27/29/-2/…./…/000/00           29 NNE AERO 22 NNE RMY 30
03/03 40/25/33/+1/…./…/367/54           21 ESE AERO 14 ESE RMY N/A
03/04 35/18/27/-5/…./…/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 43/22/33/0/0.00/0.0/660/98            20 WSW AERO M  M   RMY N/A
03/10 40/26/33/0/…./…/000/00            32 ESE AERO 23 S   RMY 32
03/11 48/33/41/+7/…./…/534/79           40 NW  AERO 37 NNW RMY 41
03/12 41/27/34/0/…./…/494/70            32 N   AERO 33 N   RMY 34
03/13 43/24/34/0/…./…/404/57            18 W   AERO 21 W   RMY 23
03/14 48/32/40/0/…./…/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/-4/0.00/0.0/695/96           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/…./…/227/31           25 SSE AERO M  M   RMY 46
03/22 39/34/37/0/…./…/000/00            40 W   AERO M  M   RMY 44
03/23 45/28/37/-1/0.00/0.0/523/71           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 Low temp since midnight is 35F; normal low is 33F

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

RECORDS FOR APRIL 3
HIGH 76 IN 1892
LOW 16 IN 1894
PRECIP 2.18 IN. IN 1990
SNOWFALL 8.0 IN. IN 1915
PEAK GUST 83e MPH NW IN 1977 [RECORD FOR MONTH]

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

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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