Wednesday, May 7, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
WEDNESDAY, MAY 7, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

TEMPERATURES RISE TO UPPER 60’S UNDER SUNNY SKIES
WINDS ARE DIMINISHED CONSIDERABLY OVER PAST FEW DAYS

A beautiful sunny, mild and very dry day today with
dew points falling into the mid-20’s this afternoon
along with relative humidity dropping under 20%.

APRIL 2014 PRELIMINARY STATISTICS

[Departures are relative to the 1981-2010 averages]

TEMPERATURE: Deg. F
Avg. Max. 55.9 [+0.2] Avg. Min. 37.5 [-0.2] Mean      46.7 [0.0] 24-hr. corrected mean: 46.1
Max. temp: 73 on the 14th
Min. temp: 28 on the 16th and 18th
Total heating degree day units: 544 [-7] Total seasonal heating units:  6,171  [+136] [Season starts 7/1] Seasonal total this date 2012: 5,522 [+649]

PRECIPITATION: Inches
Total: 4.00 [-0.55] Greatest in 24 hours: 1.22 inches on the 15th
Total snowfall: 0.8 inches
Greatest in 24 hours:  0.8 inches on the 16th

WIND
Av. speed (uncorrected): 13.6 mph
Av. speed (corrected):   13.9 mph
Prevailing direction: NW @ 13% possible

SUNSHINE
Total astronomical minutes: 11,946 of possible 24,094 or 50%
Total Campbell-Stokes card minutes; 11,508 of possible 23,250 or 49%

Today’s Observations:

7 A.M.
Weather: Clear, small patch thin cirrus vicinity of station WNW-NNW
Temperature: 49F; Dew Point: 30F; Wind: NNW at 9 kts
Sea-level pressure: 30.16 ins. Hg, rising then more slowly
Visibility: 75 miles, light distant haze
6-hr max temp: 49F
6-hr min temp: 42F
24-hr precip: Trace
BHO SA 1155 CLR 70 213/49/30/3309/016/ SML PTCH THN CI VC WNW-NNW
LGT DSNT HZ/ 8/001 51019 10049 20042

10 A.M.
Weather: Scattered cirrus, small cumulus fractus/cumulus ESE-SW,
cirrus layer extending S-WNW invading
Temperature: 60F; Dew Point: 31F; Wind: NW at 4 kts,
Sea-level pressure: 30.19 ins. Hg, rising, then more slowly
Visibility: 75 miles, light distant haze
BHO SA 1455 250 SCT 75 224/60/31/3204/019/ SML CU FRMG ESE-SW
CI LYR XTDNG S-WNW INVADING/ 8/105 51011

1 P.M.
Weather: Scattere cirrus, thin scattered cirrus layers invading,
few cumulus fractus/cumulus ESE-S, mostly clear N-ESE
Temperature: 66F; Dew Point: 26F; Wind: WNW at 10 kts,
Sea-level pressure: 30.16 ins. Hg, decreasing then more slowly
Visibility: 75 miles, light distant haze
6-hr max temp: 67F
6-hr min temp: 49F
BHO SA 1755 250 SCT 300 –SCT 75 215/66/26/3010/016/ FEW SML CUFRA/CU
ESE-S CI LYRS INVADING MSTLY CLR N-ESE LGT DSNT HZ/ 8/106 56009
10067 20049

WEATHER SUMMARY FOR TUESDAY, MAY 6, 2014

TEMPERATURE (DEGREES F)
MAX…..63    NORMAL…..63
MIN…..42    NORMAL…..45
MEAN….53    NORMAL…..54

DEPARTURE FROM 30-YEAR NORMAL……………………..-1
TOTAL DEPARTURE FOR THE MONTH…………………….+12 [+1.8 DEGREES/DAY]

HEATING DEGREE DAYS (SEASON JUL TO JUN)
TOTAL HEATING UNITS FOR YESTERDAY…………..12  DEPARTURE……….+1
TOTAL HEATING UNITS FOR THE MONTH…………..57  DEPARTURE………-14
TOTAL HEATING UNITS FOR THE SEASON………..6228  DEPARTURE……..+122 (CORRECTED)
TOTAL HEATING UNITS LAST SEASON TO DATE……5600  DIFFERENCE…….+628

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………30 NW   AT  3:04 P.M.
ASOS…………………..33 NW   AT  3:57 P.M.
DAVIS………………….29 NW   AT  3:03 P.M.  RMY 30
FASTEST MILE FOR YESTERDAY………………. 21 NW   AT  5:02 P.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..21 NW   AT  5:02 P.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….20 WNW  AT  2:49 P.M.
AVERAGE WIND SPEED AND DIRECTION…………10.5 NW
ASOS…………………10.4
DAVIS…………………9.2 NW [320 deg] * Last of several occurrences…

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….trace DEPARTURE………….-0.12
ASOS…………..0.00
TOTAL PRECIPITATION FOR THE MONTH……….0.50  DEPARTURE………….-0.24
ASOS…………..0.51
TOTAL PRECIPITATION FOR THE YEAR……….19.62  DEPARTURE………….+0.33
ASOS………….20.04

SNOWFALL (INCHES) THROUGH THIS MORNING (EST)
TOTAL SNOWFALL 24 HRS ENDING 7 A.M……….0.0  DEPARTURE……………0.0
TOTAL SNOWFALL FOR THE MONTH…………….0.0  DEPARTURE……………0.0
TOTAL SNOWFALL FOR THE SEASON…………..85.6  DEPARTURE………….+22.9

PRELIMINARY CLIMATE SUMMARY FOR APRIL-MAY 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/+4/0.00/0.0/452/59          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/-11/0.43/0.8/757/94         39 NNW AERO N/A        RMY 39
4/17 39/29/34/-13/T/T/566/70              35 NE  AERO N/A        RMY 34
4/18 42/28/35/-13/0.00/0.0/016/02         25 E   AERO N/A        RMY 25
4/19 62/35/49/1/0.00/0.0/732/90           31 NW  AERO N/A        RMY 32
4/20 52/36/44/-5/0.00/0.0/783/96          21 E   AERO N/A        RMY 22
4/21 67/36/52/+3/0.00/0.0/778/95          25 SSW AERO N/A        RMY 26
4/22 72/44/58/+9/0.07/0.0/427/52          32 S   AERO N/A        RMY 33
4/23 52/43/48/-2/0.27/0.0/0/0             47 NW  AERO N/A        RMY 47 TSTM
4/24 56/38/47/-3/0.00/0.0/810/98          52 NW  AERO N/A        RMY 54
4/25 64/39/52/+2/0.00/0.0/721/87          25 S   AERO N/A        RMY 25
4/26 44/39/42/-9/0.28/0.0/0/0             18 E   AERO N/A        RMY 18
4/27 46/38/42/-9/0.15/0.0/8/1             21 NW  AERO N/A        RMY 23
4/28 56/36/46/-6/T/0.0/326/39             31 ENE AERO N/A        RMY 33
4/29 42/38/40/-12/T/0.0/0/0               32 ENE AERO N/A        RMY 35
4/30 44/38/41/-11/0.37/0.0/0/0            25 ESE AERO N/A        RMY N/A

5/1  64/43/54/+1/0.49/0.0/…/..          32 SSE RMY 36
5/2  68/51/60/+7/T/0.0/…/..             28 W   RMY 29
5/3  66/48/57/+4/…./0.0/…/..          21 SW  RMY N/A
5/4  60/47/54/0/0.01/0.0/…/..           51 WNW RMY 54
5/5  64/46/55/+1/T/0.0/…/..*            30 NW  RMY 32
5/6  63/42/53/-1/T/0.0/…/..             30 NW  RMY 30

5/7  morning low temp: 42F; the normal low is now 45F

*  trace added for May 5…

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

DAILY RECORDS FOR MAY 2014
None so far.

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

RECORDS FOR MAY 7
HIGH 93F IN 1930
LOW 33F IN 1970
PRECIP 1.19 INCHES IN 2005
SNOWFALL TRACE IN 1967
PEAK GUST 66e MPH WNW IN 1940

RECORDS FOR MAY 8
HIGH 89F IN 2000
LOW 29F IN 1956
PRECIP 1.48 INCHES IN 1886
SNOWFALL TRACE IN 1898, 1947
PEAK GUST 68e MPH NNW IN 1943

TODAY’S REPORT PREPARED BY: Robert Skilling