Thursday, March 19, 2020

| March 19, 2020 | Reply

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

DAILY DISCUSSION AND CLIMATE SUMMARY
THURSDAY, MARCH 19, 2020
ALL TIMES ARE IN EASTERN STANDARD TIME

A LIGHT, COLD RAIN WITH REDUCED VISIBILITY
DUE TO FOG….

Weather conditions consisted of light rain
accompanied by a thick fog that limited
visibility to a 1/2 mile. Rain overnight
left 0.17 inches in the gauge by 7 A.M.,
with another 0.37 inches falling by 1 P.M.
Wind picked up since this morning, reaching
36 MPH by noontime.

The high so far today is 43F, this is 2 degrees
below the normal high of 45F. The low since
midnight is 37F, this is 10 degrees above the
normal low of 27F.

Today’s Observations:

7 A.M.
Weather: Light rain
Temperature: 38F; Dew Point: 38F; Relative Humidity: 100%
Wind: E at 13G21 kts
Sea-level pressure: 30.39 ins. Hg: falling steadily
Visibility: 1/2 mile, fog
6-hr Max temp: 38F
6-hr Min temp: 37F
24-hr Precip:  0.17 ins.
24-hr Snowfall: 0.0 ins.
BHO SA 1155 X W3 1/2R-F 293/38/38/0913G21/039/ R-CTD/
8//// 70017 58008 10038 20037

10 A.M.
Weather: Light rain
Temperature: 40F; Dew Point: 40F; Relative Humidity: 100%
Wind: E at 10G23 kts
Sea-level pressure: 30.35 ins. Hg: falling steadily
Visibility: 1/2 mile, fog
3-hr Precip:  0.30 ins.
3-hr Snowfall: 0.0 ins.
BHO SA 1455 X W3 1/2R-F 282/40/40/0810G23/035/ R-CTD/
8//// 60030 58011

1 P.M.
Weather: Light rain
Temperature: 40F; Dew Point: 40F; Relative Humidity: 100%
Wind: E at 17G31 kts, Peak wind: 36 MPH (31 kts) ENE at
12:43 P.M.
Sea-level pressure: 30.27 ins. Hg: falling, then more slowly
Visibility: 1/2 mile, fog
6-hr Max temp: 43F
6-hr Min temp: 38F
6-hr Precip:  0.37 ins.
6-hr Snowfall: 0.0 ins.
BHO SA 1755 X W3 1/2R-F 253/40/40/0817G31/027/ R-CTD PK WND
0731/43/ 8//// 60037 58029 10043 20038

SUMMARY FOR WEDNESDAY, MARCH 18, 2020

TEMPERATURE (DEGREES F)
MAX…..54   NORMAL…..45
MIN…..31   NORMAL…..27
MEAN….43   NORMAL…..36

DEPARTURE FROM 30-YEAR NORMAL………………+7
TOTAL DEPARTURE FOR THE MONTH………………+155 [+8.4 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………22  DEPARTURE……. -7
TOTAL HEATING UNITS FOR THE MONTH…………..414  DEPARTURE……-155
TOTAL HEATING UNITS FOR THE SEASON…………4554  DEPARTURE……-583
TOTAL HEATING UNITS LAST SEASON TO DATE…….5092  DEPARTURE……-538

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..26 S   AT   7:45 P.M.
AERO…………………….26 S   AT   7:42 P.M.
ASOS…………………….27 S   AT   7:45 P.M.
DAVIS……………………28 S   AT   7:44 P.M. RMY 26
FASTEST MILE FOR YESTERDAY………………….17 S   AT   5:39 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….18 S   AT   5:40 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………18 S   AT   5:41 P.M.
AVERAGE WIND SPEED AND DIRECTION……………9.4 S
ASOS……………………9.1
DAVIS…………………..9.7 SW  [237 deg.]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.17  DEPARTURE……-0.02
ASOS…………..0.15
TOTAL PRECIPITATION FOR THE MONTH……….0.60  DEPARTURE……-2.54
ASOS…………..0.68
TOTAL PRECIPITATION FOR THE YEAR………..5.26  DEPARTURE……-6.30
ASOS…………..5.59

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…….-0.5
TOTAL SNOWFALL FOR THE MONTH…………….1.2  DEPARTURE…….-7.4
TOTAL SNOWFALL FOR THE SEASON…………..26.0  DEPARTURE……-29.6

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/…/..         28 WNW AERO 28 WNW RMY 27
03/02  52/24/38/+7/T/T/…/..              40 S   AERO 39 S   RMY 41
03/03  64/45/55/+23/…./0.0/…/..        30 S   AERO 30 S   RMY N/A
03/04  50/38/44/+12/…./0.0/…/..        56 W   AERO 56 W   RMY 58
03/05  51/32/42/+10/0.00/0.0/…/..        31 W   AERO 31 NW  RMY 32
03/06  47/30/39/+7/…./…/…/..         46 NE  AERO 45 NE  RMY 46
03/07  43/26/35/+2/…./…/…/..         42 N   AERO 43 N   RMY 44
03/08  53/26/40/+7/0.00/0.0/…/..         31 W   AERO 30 W   RMY 28
03/09  72/40/56/+23/0.00/0.0/…/..        32 SW  AERO 32 SW  RMY 31
03/10  68/49/59/+26/0.00/0.0/…/..        48 WSW AERO 46 WSW RMY 49
03/11  56/37/47/+13/0.00/0.0/…/..        31 WNW AERO M  M   RMY 21
03/12  46/31/39/+5/…./0.0/…/..         21 SE  AERO 18 SE  RMY N/A
03/13  59/38/49/+15/…./0.0/…/..        46 WNW AERO 44 WNW RMY 46
03/14  51/35/43/+8/0.00/0.0/…/..         37 W   AERO 36 W   RMY 35
03/15  47/28/38/+3/0.00/0.0/…/..         28 NW  AERO 28 NW  RMY N/A
03/16  36/22/29/-6/0.00/0.0/…/..         21 NE  AERO 21 ESE RMY 21
03/17  43/28/36/0/…./0.4/…/..          29 W   AERO 30 W   RMY 29
03/18  54/31/43/+7/…./0.0/…/..         26 S   AERO 26 S   RMY 26

03/19 The low since midnight is 37F, daily normal minimum is 27F

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

RECORDS FOR MARCH 19
HIGH 77 IN 2012
LOW -2 IN 1967
PRECIP 1.69 INS. IN 1956
SNOWFALL 17.6 INS. IN 1956 [RECORD FOR MONTH]
PEAK GUST 75e MPH WNW IN 1941

RECORDS FOR MARCH 20
HIGH 79 IN 1945
LOW 4 IN 1885
PRECIP 1.39 INS. IN 1957
SNOWFALL 11.4 INS. IN 1957
PEAK GUST 63 MPH SE IN 1975

TODAY’S REPORT PREPARED BY: Benjamin Turner

Category: Daily Discussions

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