Monday, April 15, 2019

| April 15, 2019 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
MONDAY, APRIL 15, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

DRY WITH BUILDING CUMULUS TO THE WEST FOLLOWING
THIS MORNINGS’ THUNDERSTORMS….

Thunderstorms this morning and last night leave a total
of 0.96 inches of rainfall in the gauge by 10 A.M. Since then,
skies have remained mostly cloudy with some breaks. Wind has
shifted from WNW to SSW since this morning, where a max gust
of 39 mph occurred shortly following 6 A.M. A distant fog
and building cumulus was seen to the west at the 1 A.M.
observation. The high temperature so far today is 65F, 9
degrees above our normal maximum temperature of 56F. The
low since midnight was 53F, 15 degrees above our normal
minimum temperature of 38F.

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:  5404 [-80]
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: Partial obscuration due to fog, steady rain
with thunderstorms ending shortly after 6 A.M.
Temperature: 54F; Dew Point: 54F; Wind: NW at 9G16 kts,
Peak wind: 39 MPH (34 kts) WNW at 6:03 A.M.
Sea-level pressure: 29.43 ins. Hg, falling then rising
Visibility: 1 mile, fog
6-hr Max temp: 62F
6-hr Min temp: 54F
24-hr Precip:  0.92 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 –X 1RF 965/54/54/3409G16/943/ PK WND 3434/03/
R+ BCMG R TSEUKN/ 8//// 70092 51010 10062 20054

10 A.M.
Weather: Broken altostratus
Temperature: 57F; Dew Point: 55F; Wind: SSE at 14G19 kts
Sea-level pressure: 29.51 ins. Hg, rising, then more quickly
Visibility: 70 miles
3-hr Precip: 0.04 ins.
BHO SA 1455 E140 BKN 70 994/57/55/1614G19/951/ FEW STFA
ALQDS/ 8/720 6004/ 55029

1 P.M.
Weather: Broken cumulus
Temperature: 65F; Dew Point: 53F; Wind: SSW at 10G20 kts
Sea-level pressure: 29.41 ins. Hg, falling, then more quickly
Visibility: 40 miles, distant fog in all directions
6-hr Max temp: 65F
6-hr Min temp: 53F
6-hr Precip:  0.04 ins.
6-hr snowfall: 0.0 ins.
BHO SA 1755 E40 BKN 40 960/65/53/2010G20/941/ DSNT FG ALQDS/
8/200 6004/ 56034 10065 20053

SUMMARY FOR SUNDAY, APRIL 14, 2019

TEMPERATURE (DEGREES F)
MAX…..71   NORMAL…..55
MIN…..51   NORMAL…..37
MEAN….61   NORMAL…..46

DEPARTURE FROM 30-YEAR NORMAL…………………..+15
TOTAL DEPARTURE FOR THE MONTH…………………..+21 [+1.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………4   DEPARTURE……..-15
TOTAL HEATING UNITS FOR THE MONTH………….280   DEPARTURE……..-20
TOTAL HEATING UNITS FOR THE SEASON………..5685   DEPARTURE……..-99
TOTAL HEATING UNITS LAST SEASON TO DATE……5407   DIFFERENCE……+278

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 S   AT 10:50 P.M.
AERO…………………….18 S   AT 11:32 P.M.
ASOS…………………….26 S   AT 11:52 P.M.
DAVIS……………………29 S   AT 11:55 P.M.  RMY N/A
FASTEST MILE FOR YESTERDAY………………….19 S   AT 11:20 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….20 S   AT 10:59 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………20 S   AT 11:58 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..9.0 SSE
ASOS…………………..9.6
DAVIS………………….9.1 SSE [159 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.92  DEPARTURE…….+0.76
ASOS…………..0.87
TOTAL PRECIPITATION FOR THE MONTH……….2.68  DEPARTURE…….+0.32
ASOS…………..2.58
TOTAL PRECIPITATION FOR THE YEAR……….15.72  DEPARTURE…….-0.64
ASOS………….15.75

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M………0.0  DEPARTURE……..-0.1
TOTAL SNOWFALL FOR THE MONTH………….TRACE  DEPARTURE……..-2.1
TOTAL SNOWFALL FOR THE SEASON………….47.6  DEPARTURE…….-14.2

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/-3/0.00/0.0/479/71           16 NNW AERO 13 NNW RMY 22
03/02 31/27/29/-2/0.48/4.2/000/00           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 40/32/36/-8/0.08/0.0/…/..           23 NE  AERO 16 N   RMY 25
04/10 43/30/37/-8/T/T/…/..                32 NW  AERO 26 NW  RMY 36
04/11 51/29/40/-5/0.00/0.0/…/..           23 NW  AERO 18 NW  RMY N/A
04/12 53/38/46/+1/…/…/…/..            35 SSW AERO 29 SSW RMY 39
04/13 71/54/63/+17/…/…/…/..           38 SSW AERO 32 SSW RMY N/A
04/14 71/51/61/+15/…/…/…/..           25 S   AERO 18 S   RMY N/A

04/15 Low temp since midnight is 54F; normal low is 38F

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

RECORDS FOR APRIL 15
HIGH 81 IN 1896
LOW 23 IN 1943
PRECIP 1.75 IN. IN 2007
SNOWFALL 1.0 IN. IN 1916, 1962
PEAK GUST 66 MPH E IN 2007

RECORDS FOR APRIL 16
HIGH 89 IN 2012
LOW 23 IN 1943
PRECIP 2.45 IN. IN 1929
SNOWFALL 2.0 IN. IN 1904, 1962
PEAK GUST 73 MPH E IN 2007

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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