Saturday, April 6, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SATURDAY, APRIL 6, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

CLOUDY, FOGGY EARLY MORNING CLEARING TO MAKE WAY FOR
MOSTLY CLEAR SKIES IN THE LATE MORNING INTO THE EARLY
AFTERNOON….

This morning, 100% humidity with dense fog was experienced
at the observatory which began clearing after the 7 o’clock
EST observation, leading to mostly clear skies by the 10
o’clock observation. Since then, only scattered passing
fair weather cumulus clouds have been seen at the observatory.
The high so far today is 61F, which is 9 degrees above the
normal maximum temperature of 52F. Wind has been relatively
light, only occasionally gusting over 10 knots.

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: Fog
Temperature: 36F; Dew Point: 36F; Wind: WNW at 5 kts
Wind: light
Sea-level pressure: 30.21 ins. Hg, rising steadily
Visibility: 1/8 mile, fog
6-hr Max temp: 36F
6-hr Min temp: 33F
24-hr Precip:  0.22 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
4/6/2019 SAT W3 X 1/8F 231/36/36/2905/021/ WND LGT/
8//// 52003 70022 10036 20033

10 A.M.
Weather: Scattered cumulus
Temperature: 49F; Dew Point: 42F; Wind: W at 6 kts
Sea-level pressure: 30.18 ins. Hg, falling, then more quickly
Visibility: 70 miles, distant haze in all directions
3-hr Precip: 0.00 ins.
BHO SA 1455 14 SCT 70 220/49/42/2706/018/ DSNT HZ ALQDS/
8/100 58011

1 P.M.
Weather: Scattered cumulus
Temperature: 61F; Dew Point: 44F; Wind: W at 9 kts
Sea-level pressure: 30.13 ins. Hg, falling, then more slowly
Visibility: 70 miles, distant haze in all directions
6-hr Max temp: 61F
6-hr Min temp: 36F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
BHO SA 1755 14 SCT 70 202/61/44/2809/013/ DSNT HZ ALQDS/
8/100 56018 10061 20036

SUMMARY FOR FRIDAY, APRIL 5, 2019

TEMPERATURE (DEGREES F)
MAX…..47   NORMAL…..51
MIN…..27   NORMAL…..34
MEAN….37   NORMAL…..43

DEPARTURE FROM 30-YEAR NORMAL…………………….-6
TOTAL DEPARTURE FOR THE MONTH…………………….-5 [-1.2 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..28   DEPARTURE………+6
TOTAL HEATING UNITS FOR THE MONTH………….121   DEPARTURE………+5
TOTAL HEATING UNITS FOR THE SEASON………..5526   DEPARTURE……..-74
TOTAL HEATING UNITS LAST SEASON TO DATE……5185   DIFFERENCE……+341

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..23 SSW AT 5:44 P.M.
AERO…………………….17 SSW AT 6:31 P.M.
ASOS…………………….23 SSW AT 5:59 P.M.
DAVIS……………………26 S   AT 5:43 P.M.  RMY 23
FASTEST MILE FOR YESTERDAY………………….19 SSW AT 6:18 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….17 S   AT 7:17 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………19 S   AT 6:19 P.M.
AVERAGE WIND SPEED AND DIRECTION……………8.4 SSW
ASOS……………………8.4
DAVIS…………………..8.7 SW [216 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.22  DEPARTURE…….+0.05
ASOS…………..0.20
TOTAL PRECIPITATION FOR THE MONTH……….0.66  DEPARTURE…….-0.19
ASOS…………..0.64
TOTAL PRECIPITATION FOR THE YEAR……….13.70  DEPARTURE…….-1.15
ASOS………….13.79

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……..-0.9
TOTAL SNOWFALL FOR THE SEASON…………..47.6  DEPARTURE…….-13.0

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 47/27/37/-6/…./…/…/..           23 SSW AERO 17 SSW RMY 23

04/06 Low temp since midnight is 32F; normal low is 34F

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

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

RECORDS FOR APRIL 7
HIGH 90 IN 2010
LOW 13 IN 1982
PRECIP 1.72 IN. IN 1924
SNOWFALL 4.5 IN. IN 1967, 1996
PEAK GUST 65 MPH WNW IN 1982

TODAY’S REPORT PREPARED BY: Samantha Richard