Wednesday, April 22, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, APRIL 22, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

FOG AND HUMIDITY CLEARS TUESDAY, CLEAR, DRY CONDITIONS
TO START THE DAY TODAY

Temperatures on Tuesday reached a daily maximum of 67F,
before cooling down overnight to a low this morning of
47F. Clouds cleared as well, with humidity dropping dew
points from the 50s yesterday to the low 30s today.

Hazy, but clear conditions were present this morning,
with a visibility of 70 miles in all directions.
By the 1:00 PM EST observation clouds were on the increase
with visibility dropping from WSW-N. Showers were visible
on radar further west; however, they were not quite visible
from the tower at 1:00 PM EST. A peak wind of 39 MPH from the
south occurred just after the observation. A maximum reading
of 67F had been read by this time as well.
Today’s Observations:

7 A.M.
Weather: Clear, few cirrus distant SW-NNE
Temperature: 52F; Dew Point: 33F; Wind: SSW at 7 kts,
Sea-level pressure: 29.80 ins. Hg, increasing, then more slowly
Visibility: 70 miles, light distant haze
6-hr Max temp: 52F
6-hr Min temp: 47F
24-hr precip: Trace
BHO SA 1155 CLR 70 093/52/33/2107/980/ FEW CI DSNT SW-NNE
LGT DSNT HZ ALQDS/ 8/002 51007 10052 20047

10 A.M.
Weather: Clear, few cumulus distant NNE and SSE and SW-NW,
few cirrus distant SSW-NW
Temperature: 64F; Dew Point: 32F; Wind: S at 9G19 kts,
Sea-level pressure: 29.76 ins. Hg, decreasing, then more quickly
Visibility: 70 miles, light distant haze
BHO SA 1455 CLR 70 078/64/32/189G19/976/ FEW CU NNE AND SSE
AND SW-NW FEW CI DSNT SSW-NW LGT DSNT HZ ALQDS/ 8/102 58015

1 P.M.
Weather: Scattered altocumulus, scatterd cirrus,
few cumulus is directions
Temperature: 65F; Dew Point: 30F; Wind: S at 22G31 kts,
Peak Wind: 33 knots S @ 12:24 PM EST
Sea-level pressure: 29.69 ins. Hg, decreasing, then more slowly
Visibility: 70 miles, except WSW-N 50 miles, light distant haze
6-hr Max temp: 67F
6-hr Min temp: 52F
BHO SA 1755 90 SCT 250 SCT 70 053/65/30/1822G31/969/
VSBY WSW-N 50 MI FEW CU ALQDS LGT DSNT HZ ALQDS
PK WND 1833/24/ 8/132 56025 10067 20052
SUMMARY FOR TUESDAY, APRIL 21, 2015

TEMPERATURE (DEGREES F)
MAX…..67   NORMAL…..58
MIN…..51   NORMAL…..40
MEAN….59   NORMAL…..49

DEPARTURE FROM 30-YEAR NORMAL………………….+10
TOTAL DEPARTURE FOR THE MONTH………………….+45 [+1.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………6  DEPARTURE……….-10
TOTAL HEATING UNITS FOR THE MONTH………….375  DEPARTURE……….-47
TOTAL HEATING UNITS FOR THE SEASON………..6118  DEPARTURE………+213
TOTAL HEATING UNITS LAST SEASON TO DATE……5905  DIFFERENCE……..+116

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………30 SSE   AT  12:45 A.M.
ASOS…………………..30 W     AT   1:02 P.M.
DAVIS………………….30 SSE   AT  12:44 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………..25 SSE   AT  12:15 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..22 W     AT   2:09 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….N/A
AVERAGE WIND SPEED AND DIRECTION………….12.1 W
ASOS………………….12.6
DAVIS…………………11.6 SW [223 degrees] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….TRACE  DEPARTURE…..-0.13
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..3.05  DEPARTURE…..-0.29
ASOS……………3.02
TOTAL PRECIPITATION FOR THE YEAR………..17.64  DEPARTURE…..+0.43
ASOS…………….N/A ***
*** ASOS annual totals not available due to erroneous readings

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…..-2.7
TOTAL SNOWFALL FOR THE SEASON…………..150.8  DEPARTURE….+88.4
PRELIMINARY CLIMATE SUMMARY FOR APRIL CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOWFALL/SUN(MIN.)/SUN(%)/ PEAK GUST/RMY 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

4/1  44/26/35/-6/0.00/0.0/748/98              30 WNW RMY 31
4/2  59/29/44/+3/T/0.0/375/49                 39 SSW RMY 43
4/3  56/47/52/+10/0.02/0.0/000/00             36 SW  RMY N/A
4/4  49/32/41/-1/…./0.0/501/65              54 NW  RMY 64
4/5  47/30/39/-4/…./0.0/464/60              40 W   RMY 45
4/6  48/33/41/-2/0/00/0.0/544/70              18 NE  RMY N/A
4/7  39/34/37/-6/…./0.0/000/00              21 NE  RMY N/A
4/8  41/32/37/-7/…./T/000/00                30 ENE RMY 32
4/9  35/32/34/-10/…./0.0/000/00             31 ENE RMY 32
4/10 53/35/44/-1/…./0.0/000/00              31 SW  RMY N/A
4/11 56/38/46/+1/0.00/0.0/744/94              39 WNW RMY 48
4/12 68/35/52/+7/0.00/0.0/762/96              23 WNW RMY 23
4/13 69/47/58/+12/0.00/0.0/764/96             35 SSW RMY N/A
4/14 65/51/58/+12/0.05/0.0/072/09             37 SSW RMY N/A
4/15 67/45/56/+9/0.00/0.0/…/..              32 NW  RMY 33
4/16 64/42/53/+6/0.00/0.0/…/..              31 S   RMY 21
4/17 64/45/55/+8/0.05/0.0/…/..              31 SSW RMY 32
4/18 64/43/54/+6/0.00/0.0/…/..              31 N   RMY 36
4/19 55/39/47/-1/0.00/0.0/…/..              25 NNW RMY N/A
4/20 55/38/47/-2/…./0.0/000/00              36 SE  RMY 40
4/21 67/51/59/+10/…./0.0/…/..             30 SSE RMY N/A

4/22 low since midnight is 47F normal low is 40F

DAILY RECORDS FOR APRIL 2015

4/3 – NEW RECORD DAILY HIGH MINIMUM TEMPERATURE: 47F
surpasses the previous record of 46F in 1892

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

RECORDS FOR APRIL 22
HIGH 85 IN 1977, 2001
LOW 26 IN 1981
PRECIP 1.85 IN. IN 2000
SNOWFALL 3.0 IN. IN 1940
PEAK GUST 68e MPH NW IN 1945

RECORDS FOR APRIL 23
HIGH 85 IN 1908, 2007
LOW 25 IN 1933,1989
PRECIP 1.99 IN. IN 2012
SNOWFALL 2.0 IN. IN 2012
PEAK GUST 64 MPH WNW IN 1962

TODAY’S REPORT PREPARED BY:  Brian Fitzgerald