The morning news. [volume] (Savannah, Ga.) 1887-1900, 1888-10-03
THE COOL WAVE PAST.
The Signal Bureaus Frost Map-At
What temperature Frost Occurs.

| The Signal Bureaus rrOSt Hdp-A'
What temperature Frost Occurs
The force of the cool wave is broken
There was a big rise in the temperature al
over the south yesterday. The lowest
average for nine stations of the Savannah
district of the cotton belt for the twenty
four hours ending at o'clock last night was
So. The highest average was SO.
At Thomasvllle Monday night mercury
went down to Al, and yesterday 1t rose
TO So, a range of Al in about twelve hours.
Alapaha reported As as its lowest temper
AZURE Monday night and So as its highest
Yesterday. Savannah's lowest temperature
| Monday night was So , and its highest yes
| terday was So. All stations in the Mis-
sissippi valley and in the Gulf states report
rising temperature. At 8 o'clock last night
| the mercury was at ~ h9e.
The signal bureau issued, few days ago,
a chart giving in graphic form the average
dates on which the first killing frost occurs
generally over the country. The chart was
prepared solely from the observations made
at voluntary observers stations, the data
from the regular signal service stations not
being included in it, for the resson that
observations as to the occurrence of frost
are made in the country with greater
opportunities for accuracy as to earliest
date and extent of damage than in larger
cities, where signal service stations are
generally located The observations from
which deductions have been been made
vary in length of records of from two to
ferty-nine years, thirty-six stations having
records of fifteen years or more. The total
number Of stations involved in the work are
ASP.
The frost lines with which the chart is
marked show some remarkable eccentric
ities For instance, the first killing frost at
Montreal, Canada, on Sept Is, dipped down
along the western shores of Lake Ontario,
crossed Lake Erie, and after following an
almost straight line from east TO west, dipped
again until the line ceased in Colorado. The
frost line of Oct. l follows the coast line
from Halifax, Nova Scotia, to New York,
then crosses to Harrisburg, dips down to
Pittsburg, makes an upward oblque move
ment in Omaha, and taking a southwesterly
course there, brings up at Santa Fe, Mexico.
The frost line OF Oct. Is runs from
Norfolk, Va, down to Charlotte and
to a point in Northern Georgia, runs
up to Chattanooga, thence in a northwest
erly course to Cairo ILL.,, and by twisting
around gets down finally to Ell Paso. The
Charleston frost line OF Nov. / runs across
to Atlanta, and, dipping south, runs out at
Fort Davis, i'll Texas. The next frost line
is at Savannah on Nov. Is, the next at
Jacksonville, Fla, on Dec. l, and the next
at Cedar Keys on Dec. 10. 1t will be OBJ
served that there is difference of just
fifteen days in these frost lines, and accord
ing to it, frost should not appear here in six
weeks yet.
Ther eported occurrence of frosts in various
parts of the state with temperature above
40, has caused the inquiry, at what tempera-
ture will frostS occur? LOOMS Treaty on
Meteorology, an authority recognized by
the signal bureau, says that during clear
and still night, when a thermometer, six
feet above the ground, sinks to So, very
heavy frosts may be expected, and slight
frost may occur at AZ.