Friday, April 24, 2015

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

DAILY DISCUSSION AND CLIMATE SUMMARY
FRIDAY, APRIL 24, 2015
ALL TIMES ARE IN EASTERN STANDARD TIME

FREEZING (32F) VERY EARLY THIS MORNING HERE AT SUMMIT
WEST TO NORTHWEST WINDS CONTINUE GUSTY TODAY
TEMPERATURE STRUGGLING THROUGH THE 40’S

This morning’s low temperature of 31.5F (32F) was the first freezing
reading since 32F last occurred on April 9.  Also, this freezing reading
of 32F was 4 days past the average date for late season freeze which is
April 20. The record low for this date is 22F in 1930.

Cold late April winds gusting to 30 to 35 MPH from the west and
northwest today.

Still awaiting our first 70-degree reading of the year; could rank
among the top ten latest I would think.

Today’s Observations:

7 A.M.
Weather: Scattered stratocumulus, scattered altocumulus lenticularis, few
lower cumulus SW-W, few altocumulus lenticularis N-NE
Temperature: 38F; Dew Point: 26F; Wind: NW at 15G20 kts,
Wind: Gust to 23 kts past hour
Sea-level pressure: 29.72 ins. Hg, rising slightly
Visibility: 50 miles, distant haze
6-hr Max temp: 38F
6-hr Min temp: 32F
24-hr precip: 0.00 inch
BHO SA 1155 65 SCT 85 SCT 50 066/38/26/3115G20/972/ FEW LWR CU W
FEW ACSL N-NE DSNT HZ GST 23 KTS PST HR/ 8/840 53006 10038 20032

10 A.M.
Weather: Scattered stratocumulus, scattered altocumulus/lenticularis
few lower cumulus
Temperature: 45F; Dew Point: 26F; Wind: WNW at 12G23 kts,
Sea-level pressure: 29.72 ins. Hg, decreasing slightly
Visibility: 60 miles, light distant haze
BHO SA 1455 38 SCT 80 SCT 60 065/45/26/3012G23/972/ FEW LWR CU ALQDS
FEW PTCHS ACSL LGT DSNT HZ/ 8/840 56001

1 P.M.
Weather: Scattered occasional broken stratocumulus, cumulus
Temperature: 49F; Dew Point: 24F; Wind: NW at 12G20 kts,
Wind: Direction variable W-NNW
Sea-level pressure: 29.70 ins. Hg, decreasing slightly
Visibility: 60 miles, light distant haze
6-hr Max temp: 50F
6-hr Min temp: 38F
BHO SA 1755 E50V BKN 60 059/49/24/3212G20/970/ SC/CU ALQDS
LGT DSNT HZ WND 26V33/ 8/800 56006 10050 20038

SUMMARY FOR THURSDAY, APRIL 23, 2015

TEMPERATURE (DEGREES F)
MAX…..49   NORMAL…..59
MIN…..34   NORMAL…..41
MEAN….42   NORMAL…..50

DEPARTURE FROM 30-YEAR NORMAL…………………..-8
TOTAL DEPARTURE FOR THE MONTH………………….+44 [+1.7 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..23  DEPARTURE………..+8
TOTAL HEATING UNITS FOR THE MONTH………….407  DEPARTURE……….-46
TOTAL HEATING UNITS FOR THE SEASON………..6150  DEPARTURE………+214
TOTAL HEATING UNITS LAST SEASON TO DATE……6026 DIFFERENCE……..+124

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………32 W     AT  12:38 A,M, *
ASOS…………………..37 W     AT  12:33 A.M.
DAVIS………………….37 WSW   AT  12:34 A.M. RMY N/A
FASTEST MILE FOR YESTERDAY………………..26 W     AT  12:37 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..26 W     AT  12:39 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….26 W     AT  12:34 A.M.
AVERAGE WIND SPEED AND DIRECTION………….14.5 W
ASOS………………….13.7
DAVIS…………………12.7 W [280 degrees] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M…..0.00  DEPARTURE…..-0.14
ASOS……………0.00
TOTAL PRECIPITATION FOR THE MONTH………..3.08  DEPARTURE…..-0.54
ASOS……………3.05
TOTAL PRECIPITATION FOR THE YEAR………..17.67  DEPARTURE…..+0.18
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……0.0
TOTAL SNOWFALL FOR THE MONTH……………TRACE  DEPARTURE…..-2.8
TOTAL SNOWFALL FOR THE SEASON…………..150.8  DEPARTURE….+88.3

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 67/45/56/+7/0.03/0.0/…/..              44 SSW RMY 52
4/23 49/34/42/-8/0.00/0/0/…/..              32 W   RMY N/A

4/24 low since midnight is 32F normal low is 41F

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 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

RECORDS FOR APRIL 25
HIGH 83 IN 2009
LOW 24 IN 1892
PRECIP 1.38 IN. IN 1901
SNOWFALL 0.7 IN. IN 2002.
PEAK GUST 66 MPH SE IN 1968

TODAY’S REPORT PREPARED BY:  Robert Skilling