Tuesday, March 19, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, MARCH 19, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

FAIR WEATHER WITH PARTIAL CLOUDS TODAY…

After a sunny start, cumulus began to build during
the morning holding the temperature to the middle 40s.
The high so far today is 44F shortly before the 1 PM
observation, which is 1 degree below the daily normal
maximum of 45F. The low since midnight is 25F, 2 degrees
under the normal minimum temperature of 27F. Visibility
increased throughout the day from 30 miles at 7 AM to
75 miles at 1 PM. The wind has generally been a light
breeze with a peak gust to 23 mph from the west early
this afternoon.

Today’s Observations:

7 A.M.
Weather: Clear, few stratocumulus distant NE-ENE,
few altocumulus, smoke layer along horizon N-NE
Temperature: 26F; Dew Point: 17F; Wind: W at 10 kts
Sea-level pressure: 30.36 ins. Hg, rising then more slowly
Visibility: 30 miles, hazy
6-hr Max temp: 29F
6-hr Min temp: 25F
24-hr Precip:  0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 CLR 30 282/26/17/2710/036/ FEW SC DSNT NE-ENE
FEW AC K LYR ALG HRZN N-NE HAZY/ 8/030 53015 10029 20025

10 A.M.
Weather: Scattered cumulus
Temperature: 37F; Dew Point: 20F; Wind: NW at 8 kts
Sea-level pressure: 30.38 ins. Hg, rising then more quickly
Visibility: 60 miles
3-hr Precip: 0.00 ins.
BHO SA 1455 40 SCT 60 288/37/20/3108/038/ CU FRMG ALQDS/
8/100 51006

1 P.M.
Weather: Broken cumulus (two layers)
Temperature: 41F; Dew Point: 14F; Wind: W at 10 kts
Sea-level pressure: 30.35 ins. Hg, falling then more quickly
Visibility: 75 miles
6-hr Max temp: 44F
6-hr Min temp: 26F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
BHO SA 1755 E65 BKN 80 BKN 75 279/41/14/2810/035/ 8/500
58009 10044 20026

SUMMARY FOR MONDAY, MARCH 18, 2019

TEMPERATURE (DEGREES F)
MAX…..41   NORMAL…..45
MIN…..22   NORMAL…..27
MEAN….32   NORMAL…..36

DEPARTURE FROM 30-YEAR NORMAL…………………….-4
TOTAL DEPARTURE FOR THE MONTH……………………-38 [-2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..33   DEPARTURE………+4
TOTAL HEATING UNITS FOR THE MONTH………….607   DEPARTURE……..+38
TOTAL HEATING UNITS FOR THE SEASON………..5093   DEPARTURE……..-44
TOTAL HEATING UNITS LAST SEASON TO DATE……4699   DIFFERENCE……+394

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..29 W   AT 3:50 P.M.
AERO…………………….M
ASOS…………………….30 W   AT 4:09 P.M.
DAVIS……………………31 WSW AT N/A       RMY 30
FASTEST MILE FOR YESTERDAY………………….23 W   AT 4:08 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….22 W   AT 4:10 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………24 WSW AT N/A
AVERAGE WIND SPEED AND DIRECTION…………..11.1 W
ASOS…………………..10.6
DAVIS………………….N/A

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE…….-0.19
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.97  DEPARTURE…….-0.17
ASOS…………..2.97
TOTAL PRECIPITATION FOR THE YEAR……….11.91  DEPARTURE…….+0.35
ASOS………….12.04

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.5
TOTAL SNOWFALL FOR THE MONTH……………21.0  DEPARTURE…….+12.4
TOTAL SNOWFALL FOR THE SEASON…………..45.5  DEPARTURE…….-10.1

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 38/17/28/-3/…./…/…/..           16 NNW AERO 13 NNW RMY 22
03/02 31/27/29/-2/…./…/…/..           29 NNE AERO 22 NNE RMY 30
03/03 40/25/33/+1/…./…/…/..           21 ESE AERO 14 ESE RMY N/A
03/04 35/18/27/-5/…./…/…/..           33 W   AERO 18 W   RMY 32
03/05 29/10/20/-12/0.00/0.0/…/..          28 WNW AERO 12 SW  RMY N/A
03/06 24/10/17/-15/0.00/0.0/…/..          40 WNW AERO 25 WNW RMY 41
03/07 26/6/16/-17/0.00/0.0/…/..           35 W   AERO 18 W   RMY 34
03/08 35/11/23/-10/0.00/0.0/…/..          23 WSW AERO M  M   RMY M
03/09 43/22/33/0/0.00/0.0/…/..            20 WSW AERO M  M   RMY N/A
03/10 40/26/33/0/…./…/…/..            32 ESE AERO 23 S   RMY 32
03/11 48/33/41/+7/…./…/…/..           40 NW  AERO 37 NNW RMY 41
03/12 41/27/34/0/…./…/…/..            32 N   AERO 33 N   RMY 34
03/13 43/24/34/0/…./…/…/..            18 W   AERO 21 W   RMY 23
03/14 48/32/40/0/…./…/…/..            25 S   AERO 28 S   RMY M
03/15 58/40/49/+14/0.12/0.0/…/..          37 SSW AERO 38 SSW RMY 39
03/16 50/31/41/+6/0.00/0.0/…/..           45 W   AERO 46 W   RMY 48
03/17 40/26/36/-3/0.00/0.0/…/..           40 WNW AERO M  M   RMY N/A
03/18 41/22/32/-4/0.00/0.0/…/..           29 W   AERO M  M   RMY 30

03/19 Low temp since midnight is 25F; normal low 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: Mike Iacono / Don McCasland