Wednesday, March 20, 2019

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MARCH 20, 2019
ALL TIMES ARE IN EASTERN STANDARD TIME

MOSTLY SUNNY AND WARMER WITH LIGHT WINDS…
SPRING BEGINS TODAY…VERNAL EQUINOX AT 4:58 P.M. EST

The morning low temperature of 27F was exactly normal for
the date, but the high temperature so far of 50F is well
above the normal high of 45F for this date. The temperature
has climbed above the high for Tuesday of 44F, which was
one degree cooler than the normal for yesterday, due to
abundant sunshine today. Only scattered cumulus and a few
altocumulus have filled the sky today. Visibility has been
moderate near 50 miles all day with haze in most directions.
The wind has been light much of the day with gusts only
occasionally reaching 20 mph.

Today’s Observations:

7 A.M.
Weather: Clear, few altocumulus distant SSW-WNW,
thin smoke layer along horizon N-ENE
Temperature: 32F; Dew Point: 17F; Wind: W at 6 kts
Sea-level pressure: 30.43 ins. Hg, rising then more quickly
Visibility: 55 miles, hazy
6-hr Max temp: 32F
6-hr Min temp: 27F
24-hr Precip:  0.00 ins.
24-hr snowfall: 0.0 ins.
Snow depth: 0 ins.
BHO SA 1155 CLR 55 305/32/17/2706/043/ FEW AC DSNT
SSW-WNW THN K LYR ALG HRZN N-ENE HAZY/ 8/030 51011
10032 20027

10 A.M.
Weather: Scattered altocumulus
Temperature: 42F; Dew Point: 16F; Wind: S at 7 kts
Sea-level pressure: 30.42 ins. Hg, falling then more quickly
Visibility: 50 miles, hazy
3-hr Precip: 0.00 ins.
BHO SA 1455 85 SCT 50 302/42/16/1807/042/ HAZY/ 8/030
58003

1 P.M.
Weather: Scattered cumulus
Temperature: 49F; Dew Point: 18F; Wind: SSW at 10 kts
Sea-level pressure: 30.34 ins. Hg, falling then more quickly
Visibility: 45 miles, hazy
6-hr Max temp: 49F
6-hr Min temp: 32F
6-hr Precip:  0.00 ins.
6-hr snowfall: 0.0 ins.
BHO SA 1755 60 SCT 45 275/49/18/2110/034/ FEW AC HAZY/
8/100 58027 10049 20032

SUMMARY FOR TUESDAY, MARCH 19, 2019

TEMPERATURE (DEGREES F)
MAX…..44   NORMAL…..45
MIN…..25   NORMAL…..27
MEAN….35   NORMAL…..36

DEPARTURE FROM 30-YEAR NORMAL…………………….-1
TOTAL DEPARTURE FOR THE MONTH……………………-39 [-2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..30   DEPARTURE………+1
TOTAL HEATING UNITS FOR THE MONTH………….637   DEPARTURE……..+39
TOTAL HEATING UNITS FOR THE SEASON………..5123   DEPARTURE……..-43
TOTAL HEATING UNITS LAST SEASON TO DATE……4740   DIFFERENCE……+383

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………..25 W   AT 3:05 P.M.
AERO…………………….M
ASOS…………………….28 W   AT 3:06 P.M.
DAVIS……………………29 WSW AT 3:05 P.M.  RMY N/A
FASTEST MILE FOR YESTERDAY………………….20 W   AT 3:45 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………….21 W   AT 3:48 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE………………22 WSW AT 3:48 P.M.
AVERAGE WIND SPEED AND DIRECTION…………..10.6 W
ASOS……………………9.5
DAVIS………………….10.6 W [261]

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…….-0.36
ASOS…………..2.97
TOTAL PRECIPITATION FOR THE YEAR……….11.91  DEPARTURE…….+0.16
ASOS………….12.04

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……..-0.4
TOTAL SNOWFALL FOR THE MONTH……………21.0  DEPARTURE…….+12.0
TOTAL SNOWFALL FOR THE SEASON…………..45.5  DEPARTURE…….-10.5

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 40/26/33/-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 44/25/35/-1/0.00/0.0/…/..           25 W   AERO M  M   RMY N/A

03/20 Low temp since midnight is 27F; normal low is 28F

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

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

RECORDS FOR MARCH 21
HIGH 81 IN 1921
LOW 2 IN 1885
PRECIP 2.67 INS. IN 1974
SNOWFALL 10.6 INS. IN 1958
PEAK GUST 72 MPH NE IN 1958

TODAY’S REPORT PREPARED BY: Mike Iacono