Tuesday, April 9, 2019

| April 9, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, APRIL 9, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

MORNING FOG GRADUALLY DISSIPATING THROUGHOUT
THE DAY WITH A LIGHT NORTHEASTERLY WIND….

This morning we measured 0.19 inches from yesterday’s
rainfall. Fog reduced throughout the day, with a
visibility of 5 miles being observed around noontime.
Wind has been light and from the northeast throughout the
day, with an average wind speed around 7 mph. Due to
an overcast sky, temperatures have remained well below
seasonal averages. The high so far today is 38F, 15 degrees
below the normal of 53F. The low since midnight is 32F,
3 degrees below the daily normal minimum of 35F.

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: 1.82 ins. on the 3rd-4th

SNOWFALL, Inches
Total: 23.1 [+10.4]
Greatest in 24 hrs: 15.8 ins. on the 3rd-4th

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: Fog
Temperature: 40F; Dew Point: 40F; Wind: NE at 6 kts,
Wind: Light
Sea-level pressure: 29.82 ins. Hg, falling then rising
Visibility: 1/2 mile, fog
6-hr Max temp: 34F
6-hr Min temp: 32F
24-hr Precip:  0.19 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 W3 X 1/2F 097/32/32/0506/982/ WND LGT/
8//// 70019 52007 10034 20032

10 A.M.
Weather: Partial obscuration due to fog
Temperature: 35F; Dew Point: 35F; Wind: ENE at 6 kts,
Wind: Light
Sea-level pressure: 29.81 ins. Hg, falling steadily
Visibility: 1 mile, fog
3-hr Precip: 0.00 ins.
BHO SA 1455 –X 1F 093/35/35/0706/981/ WND LGT/ 8////
56004

1 P.M.
Weather: Overcast stratus
Temperature: 37F; Dew Point: 37F; Wind: E at 8 kts
Sea-level pressure: 29.73 ins. Hg, falling steadily
Visibility: 5 miles, fog
6-hr Max temp: 38F
6-hr Min temp: 32F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
BHO SA 1755 E10 OVC 5F 067/37/37/1008/973/ 8/6// 56026
10038 20032

SUMMARY FOR MONDAY, APRIL 8, 2019

TEMPERATURE (DEGREES F)
MAX…..48   NORMAL…..53
MIN…..34   NORMAL…..35
MEAN….41   NORMAL…..44

DEPARTURE FROM 30-YEAR NORMAL……………………-3
TOTAL DEPARTURE FOR THE MONTH……………………+8 [+0.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..24   DEPARTURE………+3
TOTAL HEATING UNITS FOR THE MONTH………….149   DEPARTURE………-8
TOTAL HEATING UNITS FOR THE SEASON………..5554   DEPARTURE……..-87
TOTAL HEATING UNITS LAST SEASON TO DATE……5243   DIFFERENCE……+305

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 NE  AT 7:30 A.M.
AERO…………………….20 NE  AT 9:26 A.M.
ASOS…………………….27 NE  AT 7:32 A.M.
DAVIS……………………27 ENE AT 7:31 A.M.  RMY 26
FASTEST MILE FOR YESTERDAY………………….20 NE  AT 7:32 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 NE  AT 7:33 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………21 ENE AT 7:33 A.M.
AVERAGE WIND SPEED AND DIRECTION……………10.0 NNW
ASOS……………………10.5
DAVIS…………………..10.2 N [6 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.19  DEPARTURE…….+0.03
ASOS…………..0.20
TOTAL PRECIPITATION FOR THE MONTH……….0.96  DEPARTURE…….-0.20
ASOS…………..0.91
TOTAL PRECIPITATION FOR THE YEAR……….14.00  DEPARTURE…….-1.16
ASOS………….14.06

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……..-1.4
TOTAL SNOWFALL FOR THE SEASON…………..47.6  DEPARTURE…….-13.5

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/-3/0.00/0.5/479/71           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/…./0.0/…/..           29 S   AERO 25 S   RMY 31
04/03 62/35/49/+7/…./0.0/…/..           54 W   AERO 58 W   RMY 56
04/04 50/34/42/0/…./0.0/…/..            46 W   AERO 41 W   RMY N/A
04/05 47/27/37/-6/…./0.0/…/..           23 SSW AERO 17 SSW RMY 23
04/06 64/32/48/+5/…./0.0/…/..           24 NW  AERO 18 W   RMY 26
04/07 66/41/54/+11/0.00/0.0/…/..          24 S   AERO 18 S   RMY 25
04/08 48/34/41/-3/0.49/0.0/…/..           25 NE  AERO 20 NE  RMY 26

04/09 Low temp since midnight is 40F; normal low is 35F

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

RECORDS FOR APRIL 9
HIGH 83 IN 1991
LOW 18 IN 1888
PRECIP 2.38 IN. IN 1935
SNOWFALL 11.0 IN. IN 1917
PEAK GUST 72 MPH WNW IN 1962

RECORDS FOR APRIL 10
HIGH 83 IN 1922
LOW 20 IN 1985
PRECIP 2.40 IN. IN 1935
SNOWFALL 10.1 IN. IN 1996
PEAK GUST 66 MPH WNW IN 1967

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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