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ZCZC MKCNWX1
ABUS1 KWBC 122100
NATIONAL WEATHER SUMMARY
NATIONAL WEATHER SERVICE KANSAS CITY MO
3 PM CST MON FEB 12 1990

Cold Alaskan air heading south

Mother nature's Christmas gift to much of the continental U.S.
was a prolonged spell of mild weather which has prevailed since
the last week of December.

Alaska...meanwhile...has been experiencing severe cold the past
couple of weeks...and a change in the weather pattern across the
northern hemisphere has that cold air in Alaska shifting toward
the forty-eight states.

Strong northerly winds have begun to usher sharply colder air
into the north central and northwestern U.S...with snow in the
Pacific Northwest.

A heavy snow warning is in effect this afternoon and tonight for
elevations above 500 feet in the coastal mountains of western
Oregon.  Snow advisories are in effect through tonight for the
Cascade Mountains and the Williamette Valley.

Snow advisories are also in effect today for Cascade Mountains
...coastal regions and southwestern interior sections of
Washington state.

Advisories for snow and blowing snow have been posted for tonight
for the mountains passes of Montana west of the Continental
Divide.

A high wind warning is in effect for the mountainous areas of
southeastern Wyoming where wind gusts to 60 MPH are possible this
afternoon.  A winter storm watch has been posted for Tuesday for
the Nebraska Panhandle.

The arctic cold front crossing the northwestern U.S. is expected
to bring windy conditions to southern California.

A wind advisory is in effect this afternoon and tonight for the
mountains and northern deserts of southern California.  A high
wind watch has been posted for Tuesday for the mountains and
northern deserts...while a wind advisory has been issued for
Tuesday for the southern deserts.

A frost advisory has been posted for Wednesday night for the
agricultural areas around San Diego CA.

While strong and gusty north winds were ushering cold air into
the north central U.S...strong and gusty south winds prevailed
from the southern plains to the middle Mississippi Valley.

Temperatures were in the 70s early this afternoon across the
southern plains region and the lower Mississippi Valley...and
were in the 60s as far north as Iowa.  Several cities have
already broken previous record high temperatures for the date.

Temperatures were also in the 60s in the southeastern U.S...with
70s across the Florida Peninsula.  Temperatures were warming into
the 60s and 70s in southern California and southern Arizona.

Readings were still only in the 20s this afternoon across parts
of Minnesota...Wisconsin and Michigan.

Temperatures were dropping during the daylight hours in the
northern plains region and the northern Rockies...due to the
invasion of arctic air.  At midday...Cutbank MT was reporting a
temperature of just 3 degrees above zero...and strong northerly
winds were producing a wind chill reading 39 degrees below zero.

Parts of Alaska were experiencing rapid warming as the cold air
over the state began to slide down Canada toward the U.S.  Nome
AK experienced a temperature rise of 19 degrees in twenty-one
minutes this morning...from 25 degrees below zero to 6 degrees
below zero between 811 am and 832 AM.

Temperatures remained above freezing last night over California
and southern Arizona...and from the High Plains region to the
southern and middle Atlantic Coast.

Morning lows were in the 50s in southern California and parts of
southern Arizona...and in the lower Rio Grande Valley of Texas.
Morning lows in southern Florida were in the 50s and lower 60s.

Temperatures dipped into the teens and single numbers across
parts of Minnesota...Wisconsin and Michigan...and across northern
New England and upstate New York.  Subzero readings were confined
to northern Maine.

The low for the nation this morning was 5 degrees below zero at
Caribou ME.

Showers and thunderstorms produced record rains in Florida on
Sunday.  Rainfall totals of 1.22 inches at Melbourne FL and 0.84
inches at Orlando FL established new records for February 11th.

Sunday marked a record forty-seven straight days of above normal
temperatures for La Crosse WI.  Since the 27th of december
temperatures at La cross have been averaging 11 degrees above
normal.

On this date in 1899...Texas and the eastern plains experienced
their coldest morning of modern record.  The mercury dipped to
8 degress below zero at Fort Worth TX...and to 22 below zero at
Kansas City MO.  The temperature at Camp Clarke NE plunged to
47 degrees below zero to establish a state record.  In the
eastern U.S...Washington D.C. hit 15 degrees below zero...and
Charleston SC was blanketed with a record four inches of snow.

Hugh Crowther
National Severe Storms Forecast Center
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