Tuesday, July 29, 2014

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

DAILY DISCUSSION AND CLIMATE SUMMARY
TUESDAY, JULY 29, 2014
ALL TIMES ARE IN EASTERN STANDARD TIME

CALM CLEAR CONDITIONS OVERTAKE THE REGION
FOLLOWING YESTERDAY’S ACTIVE THUNDERSTORM DAY

Last evening a pair of cold fronts passed
through the region sparking several isolated severe
thunderstorms. Only one thunderstorm was recorded
here at Blue Hill, beginning at 7:37 AM EST and ending
at 8:51 AM EST, the same cell that later produced
a confirmed EF2 tornado in Chelsea and Revere.

Skies today have been much quieter with mostly low small
cumulus overhead. Clear and dry conditions have also
led to above average visibility at over 60 miles
throughout the morning.

Today’s Observations:

7 A.M.
Weather: Scattered altocumulus, few cumulus distant SE-N
Temperature: 64F; Dew Point: 55F; Wind: NW at 9G16 kts
Sea-level pressure: 29.76 ins. Hg, decreasing, then increasing
Visibility: 65 miles
6-hr max temp: 64F
6-hr min temp: 60F
24-hr precip: 0.10
BHO SA 1155 180 SCT 65 079/64/55/3109G16/976/ FEW CU DSNT SE-N/
8/130 53025 ASOS 70011 MANUAL 70010 10064 20060

10 A.M.
Weather: Few cumulus SE-N and overhead
Temperature: 71F; Dew Point: 55F; Wind: WNW at 9 kts,
Sea-level pressure: 29.80 ins. Hg, increasing, then more slowly
Visibility: 70 miles
BHO SA 1455 CLR 70 092/71/55/3009/980/ FEW CU SE-N AND OVHD/
8/100 51013

1 P.M.
Weather: Broken cumulus
Temperature: 74F; Dew Point: 58F; Wind: W at 9 kts
Sea-level pressure: 29.82 ins. Hg, rising, then more quickly
Visibility: 65 miles
6-hr max temp: 75F
6-hr min temp: 64F
BHO SA 1755 E45 BKN 65 099/74/58/2709/982/ 8/100 53007 10075 20064

WEATHER SUMMARY FOR MONDAY, JULY 28, 2014

TEMPERATURE (DEGREES F)
MAX…..81    NORMAL…..81
MIN…..65    NORMAL…..63
MEAN….73    NORMAL…..72

DEPARTURE FROM 30-YEAR NORMAL…………………….+1
TOTAL DEPARTURE FOR THE MONTH……………………+27 [+0.8 DEGREES/DAY]

COOLING DEGREE DAYS (SEASON JAN TO DEC)
TOTAL COOLING UNITS FOR YESTERDAY…………..8   DEPARTURE……….+0
TOTAL COOLING UNITS FOR THE MONTH…………214   DEPARTURE………+14
TOTAL COOLING UNITS FOR THE SEASON………..323   DEPARTURE……….-6
TOTAL COOLING UNITS LAST SEASON TO DATE……462   DIFFERENCE…….-139

PEAK GUST AND AVERAGE WIND SPEED (MPH)
PEAK WIND GUST FOR YESTERDAY………………36  S   AT  8:08 A.M.
ASOS…………………..40  SSE AT  8:08 A.M.
DAVIS………………….39  SE  AT  8:08 A.M. RMY 40
FASTEST MILE FOR YESTERDAY………………..30  S   AT  8:04 A.M.
MAXIMUM 2-MINUTE ASOS AVERAGE……………..28  S   AT  8:56 A.M.
MAXIMUM 2-MINUTE DAVIS AVERAGE…………….27  SE  AT  8:05 A.M.
AVERAGE WIND SPEED AND DIRECTION…………..14.4 S
ASOS…………………..13.8
DAVIS………………… 12.9 S [192 degrees]

PRECIPITATION (INCHES) THROUGH THIS MORNING (EST)
TOTAL PRECIPITATION 24 HRS ENDING 7 A.M….0.10  DEPARTURE……….-0.04
ASOS…………..0.11
TOTAL PRECIPITATION FOR THE MONTH……….5.08  DEPARTURE……….+0.55
ASOS…………..5.05
TOTAL PRECIPITATION FOR THE YEAR……….29.63  DEPARTURE……….-1.87
ASOS………….29.56

PRELIMINARY CLIMATE SUMMARY FOR JULY 2014 CALENDAR DAY DATA
DATA REPORTED:
DATE: MAX/MIN/MEAN/DEP/PRECIP/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

7/1  85/66/76/+6/0.00/695/76              31 SSW RMY 36
7/2  89/69/79/+9/T/639/70                 33 SSW RMY 38
7/3  91/68/80/+9/0.05/611/67              29 W   RMY 30  TSTM
7/4  72/61/67/-4/2.48/027/03              28 N   RMY N/A TSTM
7/5  77/55/66/-5/0.27/738/81              36 NW  RMY N/A
7/6  83/61/72/+1/0.00/892/98              29 SW  RMY 33
7/7  85/65/75/+4/T/563/62                 33 SW  RMY 38  TSTM [NO RAIN] 7/8  89/70/80/+8/0.00/763/84              31 SW  RMY 38
7/9  86/70/78/+6/0.00/779/86              28 SSW RMY N/A
7/10 80/65/73/+1/0.00/597/66              16 NW  RMY N/A
7/11 76/62/69/-3/0.00/732/81              22 NE  RMY N/A
7/12 85/60/73/+1/0.00/849/94              21 S   RMY 25
7/13 82/64/73/+1/0.01/676/75              31 S   RMY 35
7/14 83/69/76/+4/0.54/207/23              25 S   RMY 27
7/15 82/70/76/+4/0.02/135/15              26 S   RMY 29 TSTM
7/16 73/65/69/-3/0.98/000/00              27 SSW RMY 32 TSTM
7/17 79/62/71/-1/T/573/64                 15 WSW RMY 17
7/18 80/60/70/-2/0.00/822/92              15 NW  RMY 16
7/19 77/63/70/-2/0.00/054/06              13 E   RMY 14
7/20 72/60/66/-6/T/312/35                 16 ENE RMY 16
7/21 76/59/68/-4/0.00/667/75              16 E   RMY 19
7/22 88/63/76/+4/0.00/816/92              22 SSW RMY 25
7/23 88/68/78/+6/0.00/770/87              29 S   RMY 32
7/24 74/63/69/-3/0.01/291/33              18 ENE RMY 18
7/25 80/56/68/-4/0.00/…/..              18 NW  RMY N/A
7/26 82/63/73/+1/0.00/…/..              28 SSW RMY 32
7/27 75/65/70/-2/0.62/…/..              28 SSE RMY 30 TSTM
7/28 81/65/73/+1/0.10/…/..              36 S   RMY 40 TSTM

7/29 morning low of 60F; the normal low is now 63F

DAILY RECORDS FOR JULY 2014:

7/4  NEW DAILY RECORD RAINFALL OF 2.48 ins;
surpasses previous record of 1.78 ins. in 1950
7/16 NEW DAILY RECORD RAINFALL OF 0.98 ins;
surpasses previous record of 0.89 ins. in 1919

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

RECORDS FOR JULY 29
HIGH 97F IN 1949
LOW 53F IN 1888,1914
PRECIP 1.53 INS IN 1901
PEAK GUST 40e MPH E IN 1941

RECORDS FOR JULY 30
HIGH 99F IN 1949
LOW 51F IN 1956
PRECIP 1.84 INS IN 1976
PEAK GUST 70e MPH SW 1944

TODAY’S REPORT PREPARED BY: Brian Fitzgerald