Friday, April 5, 2019

| April 5, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, APRIL 5, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

OVERCAST WITH LIGHT WINDS AND GOOD
VISIBILITY….

Today we observed an overcast layer of
cirrostratus throughout the day. Wind
was light and variable, with a shift from
W-S being noticed a little before noontime.
Visibility was 80 miles at each observation,
partially due to very low humidity which fell
into the upper teens by 1 P.M. Pressure has
started to trend downward by 3 millibars since
9 A.M. The high so far today is 45F, 6 degrees below
the daily normal maximum of 51F. The low since
midnight is 27F, 7 degrees below the normal of 34F.

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: Overcast cirrostratus
Temperature: 31F; Dew Point: 10F; Wind: NW at 8 kts
Sea-level pressure: 30.51 ins. Hg, rising steadily
Visibility: 80 miles
6-hr Max temp: 33F
6-hr Min temp: 27F
24-hr Precip:  0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 E250 OVC 80 332/31/10/3108/051/ 8/007 53014
10033 20027

10 A.M.
Weather: Overcast cirrostratus
Temperature: 39F; Dew Point: 4F; Wind: NW at 4 kts,
Wind: Light and variable
Sea-level pressure: 30.49 ins. Hg, falling steadily
Visibility: 80 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 E250 OVC 80 327/39/4/3204/049/ WND L/V/ 8/007 58005

1 P.M.
Weather: Broken cirrostratus
Temperature: 45F; Dew Point: 5F; Wind: SSW at 4 kts,
Wind: Light and variable
Sea-level pressure: 30.45 ins. Hg, falling steadily
Visibility: 80 miles
6-hr Max temp: 45F
6-hr Min temp: 31F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
BHO SA 1755 E250 OVC 80 311/45/5/2004/045/ WND L/V/ 8/007 58016
10045 20031

SUMMARY FOR THURSDAY, APRIL 4, 2019

TEMPERATURE (DEGREES F)
MAX…..50   NORMAL…..51
MIN…..34   NORMAL…..33
MEAN….42   NORMAL…..42

DEPARTURE FROM 30-YEAR NORMAL……………………..0
TOTAL DEPARTURE FOR THE MONTH…………………….+1 [+0.1 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..23   DEPARTURE……….0
TOTAL HEATING UNITS FOR THE MONTH…………..93   DEPARTURE………-1
TOTAL HEATING UNITS FOR THE SEASON………..5498   DEPARTURE……..-80
TOTAL HEATING UNITS LAST SEASON TO DATE……5154   DIFFERENCE……+344

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..46 W   AT 12:40 A.M.
AERO…………………….41 W   AT 12:36 A.M.
ASOS…………………….49 W   AT 12:40 A.M.
DAVIS……………………51 WSW AT 12:37 A.M.  RMY N/A
FASTEST MILE FOR YESTERDAY………………….35 W   AT 12:41 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….31 W   AT 12:41 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………33 WSW AT 12:06 A.M.
AVERAGE WIND SPEED AND DIRECTION………….19.4 W
ASOS………………….18.2
DAVIS…………………19.4 W [261 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.17
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.44  DEPARTURE…….-0.24
ASOS…………..0.44
TOTAL PRECIPITATION FOR THE YEAR……….13.48  DEPARTURE…….-1.20
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……..-0.8
TOTAL SNOWFALL FOR THE SEASON…………..47.6  DEPARTURE…….-12.9

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 50/34/42/0/…./…/…/..            46 W   AERO 41 W   RMY N/A

04/05 Low temp since midnight is 27F; normal low is 34F

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

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

RECORDS FOR APRIL 6
HIGH 82 IN 1921
LOW 16 IN 1982
PRE 1.72 INS IN 1886
SNOW 12.3 INS IN 1982
WIND 71e MPH WNW IN 1940

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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