Wednesday, April 23, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, APRIL 23, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

RAIN AND MUCH COOLER TODAY WITH SOME DISTANT RUMBLES OF THUNDER
TOTAL RAINFALL FOR 24 HOURS ENDING 2 P.M. EDT 0.30 INCH

Light rain which began last evening amounted to only 0.07
inch before it ended.  Rain began again this morning
and has accumulated to 0.23 inch by 2 P.M. EDT. A few
distant rumbles were heard to the south and southeast this
morning as most of the activity remained well to the south
of here. The high temperature of 52F for today occurred
early this morning right around 8 A.M. EDT

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus, broken and overcast
altocumulus layers invading
Temperature: 52F; Dew Point: 48F; Wind: NNW at 11 kts,
Wind: Direction gradually veering
Sea-level pressure: 29.44 ins. Hg, falling slightly
Visibility: 15 miles, WNW-E 20 miles, SSE-10 10 miles,
showers of rain SSE-W, thin fog
6-hr max temp: 52F
6-hr min temp: 49F
24-hr precip: 0.07 in.
BHO 1155 55 SCT E70 BKN 100 OVC 15 968/52/48/3311/944/
AC INVADING DRK SKY/SHRA SSE-W BRGHT SKY/HIER CLD VSB N-E
VSBY WNW-E 20 SSE-W 10 THN F ALQDS WND GRDLY VEERING/
8/55/ 58003 MANUAL 70007 ASOS 70007 10052 20049

10 A.M.
Weather: Broken stratus fractus, overcast nimbostratus,
few stratus fractus drifting below summit, thunderstorm
with light rain occurring, began 9:30 A.M. occasional
lightning in cloud and cloud to cloud distant SE-S
moving NNE, thin fog, rain began 9:40 A.M.
Temperature: 48F; Dew Point: 47F; Wind: NW at 15G23 kts,
Sea-level pressure: 29.44 ins. Hg, steady
Visibility: 6 miles, except 4 miles ESE, 12 miles NE.
light rain and thin fog
3-hr precip: 0.05 in.
BHO SA 1455 E7 BKN 30 OVC 6TR-F 968/48/47/3215G23/944/ FEW
STFRA DRFTG BLO SMT TB30 SE-S MOVG NNE OCNL LTGICCC RB40/
8/72/ 50000 ASOS 60004 MANUAL 6005/

1 P.M.
Weather: Broken stratus fractus, overcast nimbostratus,
light rain and fog, light rain occasionally moderate rain
Temperature: 47F; Dew Point: 47F; Wind: NW at 14G25 kts,
Wind: Direction variability WNW to N
Sea-level pressure: 29.44 ins. Hg, rising slightly
Visibility: 5 miles in light rain and fog
6-hr max temp: 52F
6-hr min temp: 47F
6-hr precip: 0.23 in.
BHO SA 1755 E7 BKN 20 BKN 35 OVC 5R-F 969/47/47/3214G25/944/
FEW STFRA DRFTG BLO SMT R- OCNL R TE15 MOVD NE WND 30V36/
8/7/2/ 53001 ASOS 60023 MANUAL 6023/ 10052 20047

WEATHER SUMMARY FOR TUESDAY, APRIL 22

TEMPERATURE (DEGREES F)
MAX…..72    NORMAL…..58
MIN…..44    NORMAL…..40
MEAN….58    NORMAL…..49

DEPARTURE FROM 30-YEAR NORMAL…………………….+9
TOTAL DEPARTURE FOR THE MONTH……………………+54 [+2.3 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY……………7  DEPARTURE……….-9
TOTAL HEATING UNITS FOR THE MONTH………….382  DEPARTURE………-55
TOTAL HEATING UNITS FOR THE SEASON………..6009  DEPARTURE………+88
TOTAL HEATING UNITS LAST SEASON TO DATE……5425  DIFFERENCE…….+584

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………32 S   AT  3:33 P.M.
AERO…………………..N/A
ASOS…………………..34 S   AT  3:33 P.M.
DAVIS………………….32 S   AT  3:33 P.M. RMY 33
FASTEST MILE FOR YESTERDAY………………..24 S   AT  4:11 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..25 S   AT  4:11 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….24 S   AT  3:34 P.M.
AVERAGE WIND SPEED AND DIRECTION………….14.8 SSW
ASOS………………….15.3
DAVIS…………………14.3 SSW [200 deg] * last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.07  DEPARTURE………….-0.07
ASOS…………..0.07
TOTAL PRECIPITATION FOR THE MONTH……….2.93  DEPARTURE………….-0.55
ASOS…………..2.91
TOTAL PRECIPITATION FOR THE YEAR……….18.05  DEPARTURE………….+0.57
ASOS………….18.45

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…………..-2.0
TOTAL SNOWFALL FOR THE SEASON…………..85.6  DEPARTURE………….+23.1

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 72/44/58/+9/0.07/0.0/…/..          32 S   AERO N/A        RMY 33

4/23 morning low temp: 49F; the normal low is now 41F

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 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

RECORDS FOR APRIL 24
HIGH 82 IN 2001
LOW 22 IN 1930
PRECIP 2.51 INS IN 1898
SNOWFALL 1.2 INS IN 1967
PEAK GUST 59 MPH NW IN 1962

TODAY’S REPORT PREPARED BY: Robert Skilling