Sunday, April 20, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
SUNDAY, APRIL 20, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

SATURDAY’S COMBINATION OF SEASONAL WARMTH AND CLEAR CONDITIONS
CONTINUE INTO SUNDAY.

Following yesterday’s maximum of 62F, temperatures have climbed
much more slowly today, with largely clear skies above. Visibility
at both the 7:00 AM and 10:00 AM EST observations was a very clear
80 miles in all directions with relative humidity dropping throughout
the morning.

By 1:00 PM EST temperatures had risen to a maximum of 51F so far, with
cirrus fibratus generally increasing under dry conditions.

Today’s Observations:

7 A.M.
Weather: Few cirrostratus ESE-WSW, broken cirrus fibratus
Temperature: 42F; Dew Point: 22F; Wind: estimated NE at 6 kts.
Sea-level pressure: 30.51 ins. Hg, rising, then more slowly
Visibility: 80 miles
6-hr max temp: 42F
6-hr min temp: 36F
24-hr precip: 0.0
BHO SA 1155 E250 BKN 80 332/42/22/E0506/051/ FEW CS ESE-WSW/ 8/001 51022
10042 20036

10 A.M.
Weather: Clear, few cirrus/cirrostratus ESE-WNW
Temperature: 47F; Dew Point: 23F; Wind: ENE at 7G15 kts,
Sea-level pressure: 30.53 ins. Hg, decreasing, then increasing
Visibility: 80 miles
BHO SA 1455 CLR 80 338/47/23/0607G15/053/ FEW CS AND CI ESE-WNW/
8/001 53006

1 P.M.
Weather: Few cumulus distant SE, few cirrostratus SE-NNE,
broken cirrus fibratus
Temperature: 50F; Dew Point: 14F; Wind: estimated ENE at 6 kts
Sea-level pressure: 30.49 ins. Hg, steady, then falling
Visibility: 70 miles
6-hr max temp: 51F
6-hr min temp: 42F
BHO SA 1755 E250 BKN 70 325/50/14/E0606/049/ FEW CU DSNT SE FEW CS
SE-NNE/ 8/101 58013 10051 20042

WEATHER SUMMARY FOR SATURDAY, APRIL 19, 2014

TEMPERATURE (DEGREES F)
MAX…..62    NORMAL…..57
MIN…..35    NORMAL…..39
MEAN….49    NORMAL…..48

DEPARTURE FROM 30-YEAR NORMAL…………………….+1
TOTAL DEPARTURE FOR THE MONTH……………………+47 [+2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..16  DEPARTURE……….-1
TOTAL HEATING UNITS FOR THE MONTH………….341  DEPARTURE………-48
TOTAL HEATING UNITS FOR THE SEASON………..5968  DEPARTURE………+96
TOTAL HEATING UNITS LAST SEASON TO DATE……5365  DIFFERENCE…….+603

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………31 NW  AT  4:42 P.M.
AERO…………………..N/A
ASOS…………………..32 NW  AT  4:42 P.M.
DAVIS………………….31 NW  AT  4:42 P.M. RMY 32
FASTEST MILE FOR YESTERDAY………………..24 NW  AT  4:41 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..23 NW  AT  4:43 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….21 NW  AT  4:44 P.M.
AVERAGE WIND SPEED AND DIRECTION………….12.8 NNW
ASOS………………….12.4
DAVIS…………………11.1 WNW [302 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………….-0.21
ASOS…………..2.84
TOTAL PRECIPITATION FOR THE YEAR……….17.98  DEPARTURE………….+0.91
ASOS………….18.38

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE…………..-0.1
TOTAL SNOWFALL FOR THE MONTH…………….0.8  DEPARTURE…………..-1.8
TOTAL SNOWFALL FOR THE SEASON…………..85.6  DEPARTURE………….+23.3

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/…/..            32 S   AERO N/A        RMY N/A
4/12 68/44/56/+11/0.00/0.0/…/..         28 W   AERO N/A        RMY 28
4/13 65/45/55/+10/0.04/0.0/…/..         35 S   AERO N/A        RMY N/A
4/14 73/55/64/+18/0.00/0.0/…/..         55 SW  AERO N/A        RMY 62
4/15 66/38/52/+5/…./0.0/000/00          62 S   AERO N/A        RMY 68
4/16 43/28/36/-11/…./…/…/..         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 morning low temp: 36F; 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 20
HIGH 88 IN 1927
LOW 18 IN 1897
PRECIP 1.14 IN 1972
SNOWFALL 2.5 IN. IN 1904, 1972
PEAK GUST 76 MPH WNW IN 1963

RECORDS FOR APRIL 21
HIGH 85 IN 1923
LOW 22 IN 1908
PRECIP 3.18 IN. IN 1991
SNOWFALL 0.8 IN. IN 1947
PEAK GUST 76e MPH NE IN 1940

TODAY’S REPORT PREPARED BY: Brian Fitzgerald