Tuesday, April 22, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, APRIL 22, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

WARMING TREND CONTINUES WITH SUNSHINE AND SSW WINDS TODAY
HIGH READING REACHES THE LOWER 70’S

Despite a veil of high cirrus clouds today and increasingly
warm air mass brought temperatures into the low 70’s by
early this afternoon.  Wind were becoming a bit gusty from
the south and south-southwest and the air continued dry
with dew points around 40 degrees and relative humidity
down in the low to mid 30% range.

Today’s Observations:

7 A.M.
Weather: Thin scattered cirrus, two levels), few altocumulus and
altocumulus castellanus, floccus, lenticularis ENE-SSE, receding
to the east past hour, lower cirrus layer mostly distant SW-N
Temperature: 48F; Dew Point: 42F; Wind: SSW at 11 kts.
Sea-level pressure: 29.73 ins. Hg, falling
Visibility: 25 miles, hazy
6-hr max temp: 48F
6-hr min temp: 44F
BHO SA 1155 250 –SCT 300 –SCT 25 067/48/42/2011/973/
FEW ACC/FLOCCUS/ACSL ENE-SSE RCDNG E PST HR LWR CI MSTLY DSNT SW-N
HAZY/ 8/081 58012 10048 20044

10 A.M.
Weather: Broken opaque cirrus, overcast cirrus, overcast
partly thin, few altocumulus distant NNW-N
Temperature: 64F; Dew Point: 39F; Wind: S at 10 kts,
Wind: Direction variability SSE to SW
Sea-level pressure: 29.67 ins. Hg, falling then more rapidly
Visibility: 35 miles, except 25 miles NE-SE, distant haze
BHO SA 1455 E220 BKN 250 OVC 35 048/64/39/1910/967/ FEW AC DSNT NNW-N
OVC PTLY THN VSBY NE-SE 25 DSNT HZ WND 15V22/ 8/047 58019

1 P.M.
Weather: Scattered altocumulus, few lenticulars, scattered
dense cirrus, overcast cirrus opaqus, few thin spots in overcast
Temperature: 70F; Dew Point: 40F; Wind: S at 13 kts,
Wind: Direction variability SSE to SW
Sea-level pressure: 29.58 ins. Hg, falling steadily
Visibility: 35 miles, except 25 miles NE-SE, 40 miles WNW,
distant haze
6-hr max temp: 72F
6-hr min temp: 40F
BHO SA 1755 180 SCT 200 SCT E220 OVC 35 018/70/40/1813/958/ FEW ACSL
FEW THN SPTS IOVC VSBY NE-SE 25 WNW 40 DSNT HZ ALQDS WND 15V22/
8/042 57030 10072 20040

WEATHER SUMMARY FOR MONDAY, APRIL 21, 2014 PATRIOTS DAY/MARATHON MONDAY

TEMPERATURE (DEGREES F)
MAX…..67    NORMAL…..58
MIN…..36    NORMAL…..40
MEAN….52    NORMAL…..49

DEPARTURE FROM 30-YEAR NORMAL…………………….+3
TOTAL DEPARTURE FOR THE MONTH……………………+45 [+1.9 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..13  DEPARTURE……….-3
TOTAL HEATING UNITS FOR THE MONTH………….375  DEPARTURE………-47
TOTAL HEATING UNITS FOR THE SEASON………..6002  DEPARTURE………+97
TOTAL HEATING UNITS LAST SEASON TO DATE……5402  DIFFERENCE…….+600

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………25 SSW AT  8:59 P.M.
AERO…………………..N/A
ASOS…………………..26 S   AT  4:47 P.M.
DAVIS………………….25 S   AT  4:47 P.M.  RMY 26
FASTEST MILE FOR YESTERDAY………………..21 S   AT  4:19 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..21 S   AT  4:19 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….19 S   AT  4:19 P.M.
AVERAGE WIND SPEED AND DIRECTION………….12.0 SSW
ASOS………………….12.3
DAVIS…………………11.1 SSW [200 deg] * last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.00  DEPARTURE………….-0.13
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….2.86  DEPARTURE………….-0.48
ASOS…………..2.84
TOTAL PRECIPITATION FOR THE YEAR……….17.98  DEPARTURE………….+0.64
ASOS………….18.38

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE………….. 0.0
TOTAL SNOWFALL FOR THE MONTH…………….0.8  DEPARTURE…………..-1.9
TOTAL SNOWFALL FOR THE SEASON…………..85.6  DEPARTURE………….+23.2

PRELIMINARY CLIMATE SUMMARY FOR APRIL 2014 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/SNOW/SUN(MIN.)/SUN(%)/ PEAK GUST/AERO 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

4/1  48/31/40/-1/0.00/0.0/694/91          29 NNE AERO N/A        RMY N/A
4/2  56/34/45/+4/0.00/0.0/452/69          22 WSW AERO 20 MPH WSW RMY N/A
4/3  55/36/46/+4/0.00/0.0/707/92          23 NNW AERO 22 MPH NW  RMY 25
4/4  47/35/41/-1/0.31/0.0/255/33          26 ESE AERO N/A        RMY 25
4/5  51/33/42/-1/0.19/0.0/186/24          39 WNW AERO N/A        RMY 40
4/6  58/29/44/+1/0.00/0.0/755/97          25 W   AERO N/A        RMY N/A
4/7  59/44/52/+9/0.05/0.0/187/24          28 SSE AERO N/A        RMY N/A
4/8  62/41/52/+8/0.61/0.0/016/02          45 W   AERO N/A        RMY 44
4/9  60/36/48/+4/0.00/0.0/707/90          35 NW  AERO N/A        RMY 36
4/10 57/33/45/0/0.00/0.0/742/94           38 S   AERO N/A        RMY 39
4/11 70/45/58/+13/T/0.0/111/14            32 S   AERO N/A        RMY N/A
4/12 68/44/56/+11/0.00/0.0/699/88         28 W   AERO N/A        RMY 28
4/13 65/45/55/+10/0.04/0.0/215/27         35 S   AERO N/A        RMY N/A
4/14 73/55/64/+18/0.00/0.0/296/37         55 SW  AERO N/A        RMY 62
4/15 66/38/52/+5/1.22/0.0/000/00          62 S   AERO N/A        RMY 68
4/16 43/28/36/-11/0.43/0.8/…/..         39 NNW AERO N/A        RMY 39
4/17 39/29/34/-13/T/T/…/..              35 NE  AERO N/A        RMY 34
4/18 42/28/35/-13/0.00/0.0/…/..         25 E   AERO N/A        RMY 25
4/19 62/35/49/1/0.00/0.0/…/..           31 NW  AERO N/A        RMY 32
4/20 52/36/44/-5/0.00/0.0/…/..          21 E   AERO N/A        RMY 22
4/21 67/36/52/+3/0.00/0.0/…/..          25 SSW AERO N/A        RMY 26

4/22 morning low temp: 44F; the normal low is now 40F

DAILY RECORDS FOR APRIL 2014
4/14 – Minimum temperature of 55F EQUALS RECORD HIGH
MINIMUM FOR THIS DATE SET IN 1909.

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: Robert Skilling