Tuesday, April 14, 2020

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, APRIL 14, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A RATHER PLEASANT DAY FOLLOWING YESTERDAY’S STORM SYSTEM….

Yesterday’s storm brought heavy rainfall and very strong
winds to the summit of Blue Hill. Of course the big story
yesterday was the wind. A peak gust of 79 mph was measured
officially, however some of other wind systems did clock
winds over 80 mph, including the Aerovane (83 mph) and
Davis Instruments (85 mph).

The official gust of 79 mph did break the previous peak
gust record for the day, which was 59 mph SSW in 1995.

In addition to the big wind, heavy rainfall was measured
with downpours occurring late in the afternoon and early
evening. Storm total for the event was 1.42″.

Today the weather is much more tame. A mix of sun and
clouds have been the theme through the day with decreasing
wind, near normal temperatures in the mid 50s, and excellent
visibility of 60-70 miles.

Our high temperature so far today is 56F, which is 1 degree
above our daily normal high temperature of 55F. The low since
midnight is 41F, which is 4 degrees above the daily normal
low of 37F.

PRELIMINARY STATS FOR MARCH 2020

TEMPERATURE, Deg. F
Avg. Max. 49.8 [+5.5] Avg. Min. 32.3 [+5.7] Mean      41.1 [+5.6] 24-hour corrected mean: 40.5
Max. for month: 72F on the 9th
Min. for month: 15F on the 1st

HEATING DEGREE DAYS
Total heating units:    733 [-183] Total for the season:  4873 [-611] Total for last season: 5432

PRECIPITATION, Inches
Total: 4.67 [-0.91] Greatest in 24 hrs: 2.37 ins. on the 23rd-24th

SNOWFALL, Inches
Total: 2.8 [-9.9] Greatest in 24 hrs: 1.6 ins. on the 23rd

WIND, mph
Avg. uncorrected wind speed: 12.6 mph
Avg. corrected wind speed:   12.9 mph
Prevailing wind direction:   W [12%] Peak gust and direction:     56 W on the 4th

SUNSHINE:
Campbell-Stokes card minutes: 11298 minutes of possible 21516 or 53%
Astronomical total minutes: 11708 minutes of possible 22287 or 53%

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, thin scattered cirrus, few alto-
cumulus castellanus distant W-NW
Temperature: 42F; Dew Point: 27F; Relative Humidity: 55%
Wind: NW at 17G28 kts, peak wind NW 28 kts at 6:55 AM
Sea-level pressure: 30.00 ins. Hg: rising, then more rapidly
Visibility: 60 miles
6-hr Max temp: 49F
6-hr Min temp: 41F
24-hr Precip:  1.28 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 100 SCT 250 -SCT 60 158/42/27/3117G28/000/ FEW ACC DSNT
W-NW PK WND 3128/55/ 8/081 53035 70128 10049 20041

10 A.M.
Weather: Scattered altocumulus, thin scattered cirrus, few strato-
cumulus distant W-NNW
Temperature: 49F; Dew Point: 26F; Relative Humidity: 40%
Wind: WNW at 10G20 kts
Sea-level pressure: 30.04 ins. Hg: rising, then falling
Visibility: 60 miles
3-hr Precip:  0.00 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 110 SCT 250 -SCT 60 172/49/26/2910G20/004/ FEW SC DSNT
W-NNW/ 8/571 50014

1 P.M.
Weather: Broken altocumulus, broken dense cirrus, thin broken cirrus
Temperature: 55F; Dew Point: 27F; Relative Humidity: 33%
Wind: WSW at 7 kts
Sea-level pressure: 30.01 ins. Hg: falling, then more rapidly
Visibility: 70 miles
6-hr Max temp: 56F
6-hr Min temp: 42F
6-hr Precip:  0.00 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 E140 BKN 180 BKN 250 –BKN 70 164/55/27/2507/001/
8/072 58008 10056 20042

SUMMARY FOR MONDAY, APRIL 13, 2020

TEMPERATURE (DEGREES F)
MAX…..59   NORMAL…..55
MIN…..50   NORMAL…..37
MEAN….55   NORMAL…..46

DEPARTURE FROM 30-YEAR NORMAL………………..+9
TOTAL DEPARTURE FOR THE MONTH……………….+16 [+1.0 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………10  DEPARTURE……. -9
TOTAL HEATING UNITS FOR THE MONTH…………..265  DEPARTURE…….-16
TOTAL HEATING UNITS FOR THE SEASON…………5138  DEPARTURE……-627
TOTAL HEATING UNITS LAST SEASON TO DATE…….5680  DEPARTURE……-542

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..79 S   AT  3:37 P.M.
AERO…………………….83 S   AT  3:30 P.M
ASOS…………………….79 S   AT  2:27 P.M.
DAVIS……………………85 S   AT  2:27 P.M. RMY 78
FASTEST MILE FOR YESTERDAY………………….58 S   AT  3:38 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….55 S   AT  3:38 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………57 S   AT  3:38 P.M.
AVERAGE WIND SPEED AND DIRECTION……………29.5 S
ASOS……………………27.6
DAVIS…………………..27.5 S [189 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….1.28  DEPARTURE……+1.12
ASOS…………..1.34
TOTAL PRECIPITATION FOR THE MONTH……….4.90  DEPARTURE……+2.71
ASOS…………..5.08
TOTAL PRECIPITATION FOR THE YEAR……….14.23  DEPARTURE……-1.96
ASOS………….14.81

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…….-2.0
TOTAL SNOWFALL FOR THE SEASON…………..27.6  DEPARTURE……-34.1

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  33/15/24/-7/0.00/0.0/676/100        28 WNW AERO 28 WNW RMY 27
03/02  52/24/38/+7/T/T/482/71              40 S   AERO 39 S   RMY 41
03/03  64/45/55/+23/0.05/0.0/361/53        30 S   AERO 30 S   RMY N/A
03/04  50/38/44/+12/0.04/0.0/561/82        56 W   AERO 56 W   RMY 58
03/05  51/32/42/+10/0.00/0.0/666/97        31 W   AERO 31 NW  RMY 32
03/06  47/30/39/+7/0.04/0.3/283/41         46 NE  AERO 45 NE  RMY 46
03/07  43/26/35/+2/0.03/0.5/534/77         42 N   AERO 43 N   RMY 44
03/08  53/26/40/+7/0.00/0.0/508/73         31 W   AERO 30 W   RMY 28
03/09  72/40/56/+23/0.00/0.0/685/98        32 SW  AERO 32 SW  RMY 31
03/10  68/49/59/+26/0.00/0.0/246/35        48 WSW AERO 46 WSW RMY 49
03/11  56/37/47/+13/0.00/0.0/501/71        31 WNW AERO M  M   RMY 21
03/12  46/31/39/+5/0.01/0.0/156/22         21 SE  AERO 18 SE  RMY N/A
03/13  59/38/49/+15/0.20/0.0/000/00        46 WNW AERO 44 WNW RMY 46
03/14  51/35/43/+8/0.00/0.0/613/86         37 W   AERO 36 W   RMY 35
03/15  47/28/38/+3/0.00/0.0/680/95         28 NW  AERO 28 NW  RMY N/A
03/16  36/22/29/-6/0.00/0.0/618/86         21 NE  AERO 21 ESE RMY 21
03/17  43/28/36/0/0.06/0.4/000/00          29 W   AERO 30 W   RMY 29
03/18  54/31/43/+7/0.00/0.0/609/84         26 S   AERO 26 S   RMY 26
03/19  43/37/40/+4/0.63/0.0/000/00         36 E   AERO 35 E   RMY 34
03/20  66/37/52/+15/0.03/0.0/000/00        48 W   AERO 48 W   RMY 46
03/21  55/29/42/+5/0.00/0.0/535/73         45 W   AERO 48 W   RMY N/A
03/22  36/23/30/-7/0.00/0.0/692/94         23 NE  AERO 24 NE  RMY 23
03/23  40/25/33/-5/1.74/1.6/037/05         38 NNE AERO 39 NNE RMY 38
03/24  48/33/41/+3/0.63/0.0/148/20         37 NNW AERO 37 NNW RMY N/A
03/25  41/35/38/0/0.03/0.0/000/00          28 ENE AERO 28 ENE RMY 27
03/26  51/30/41/+2/0.00/0.0/613/82         25 SSE AERO 26 SSW RMY N/A
03/27  61/41/51/+12/0.00/0.0/631/84        32 NW  AERO M  M   RMY 33
03/28  56/36/46/+7/0.15/0.0/309/41         22 S   AERO 21 E   RMY N/A
03/29  43/37/40/0/0.74/0.0/000/00          32 NE  AERO 33 NE  RMY 33
03/30  40/34/37/-3/0.21/0.0/000/00         33 NE  AERO 33 NE  RMY 33
03/31  40/29/35/-6/0.08/0.0/564/74         28 ENE AERO 26 ENE RMY N/A

PRELIMINARY CLIMATE SUMMARY FOR APRIL 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  42/28/35/-6/0.00/0.0/…/..         28 NE  AERO 28 NE  RMY 30
04/02  46/35/41/0/…/0.0/…/..           39 NW  AER0 40 NW  RMY 41
04/03  42/38/40/-2/…./0.0/…/..         48 NE  AERO 53 NE  RMY 49
04/04  46/36/41/-1/…./0.0/…/..         38 NE  AERO 38 NE  RMY N/A
04/05  55/36/46/+3/T/0.0/…/..            22 S   AERO 21 S   RMY 21
04/06  61/40/51/+8/0.00/0.0/…/..         29 NW  AERO 30 NW  RMY 29
04/07  63/42/53/+10/0.00/0.0/…/..        29 W   AERO 30 W   RMY 28
04/08  50/41/46/+2/…./…/…/..         23 S   AERO 22 S   RMY 22
04/09  47/37/42/-2/…./…/…/..         58 W   AERO 58 W   RMY 56
04/10  47/35/41/-4/0.02/T/…/..           48 W   AERO 50 W   RMY 53
04/11  51/33/42/-3/0.00/0.0/…/..         38 WNW AERO 39 WNW RMY 40
04/12  60/33/47/+2/0.00/0.0/…/..         38 S   AERO 40 S   RMY N/A
04/13  59/50/55/+9/1.42/0.0/…/..         79 S   AERO 83 S   RMY 78

04/14 The low since midnight is 41F, daily normal minimum is 37F

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

RECORDS FOR APRIL 14
HIGH 80 IN 1945
LOW 21 IN 1923
PRECIP 2.22 IN. IN 1895
SNOWFALL 8.4 IN. IN 1953
PEAK GUST 71e MPH W IN 1943

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

TODAY’S REPORT PREPARED BY: Matt Douglas