Severe Thunderstorm Warning 159, NWS Denver/Boulder, CO

COZ030-032>050-120600-

SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO
NATIONAL WEATHER SERVICE DENVER CO
215 PM MDT SAT OCT 11 1997

THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES

ADAMS     ARAPAHOE     BOULDER   CLEAR CREEK   DENVER       DOUGLAS
ELBERT    GILPIN       GRAND     JACKSON       JEFFERSON    LARIMER
LINCOLN   LOGAN        MORGAN    PARK          PHILLIPS     SEDGWICK
SUMMIT    WASHINGTON   WELD

SYNOPSIS:  STRONG SOUTHWEST FLOW ALOFT CREATED FROM AN APPROACHING
UPPER LEVEL TROUGH TO THE WEST OF COLORADO IS BRINGING THE FORECAST
AREA VERY STRONG WINDS THIS AFTERNOON.  SOUTHWEST WINDS OF 35 TO 60
MPH WITH GUSTS AS HIGH AS 90 MPH CAN BE EXPECTED IN THE MOUNTAINS
AND FOOTHILLS.  THE PLAINS CAN EXPECT SOUTHEAST TO SOUTH WINDS AT 20
TO 40 MPH WINDS WITH GUSTS TO 60 MPH.

THE AIRMASS OVER THE FORECAST AREA WILL BE PRETTY UNSTABLE THIS
AFTERNOON AND INTO THIS EVENING.  A SURFACE TROUGH NOW STRETCHING
NORTH-SOUTH ALONG THE PLAINS WILL MOVE SLOWLY EAST THROUGH MID
EVENING.  AREAS TO THE WEST WILL NOT HAVE ENOUGH LOW LEVEL MOISTURE
TO PRODUCE ANY SIGNIFICANT THUNDERSTORMS...HOWEVER OVER THE FAR
EASTERN BORDER COUNTIES...ENOUGH LOW LEVEL MOISTURE MAY BE PRESENT
TO PRODUCE SOME STRONG STORMS LATE THIS AFTERNOON.

THE STRONG UPPER TROUGH TO THE WEST WILL MOVE INTO COLORADO LATE
TONIGHT AND SUNDAY BRINGING A SIGNIFICANT WINTER STORM TO THE
MOUNTAINS.  THE PLAINS CAN EXPECT TEMPERATURES 40 TO 50 DEGREES
COLDER ON SUNDAY COMPARED TO TODAY ALONG WITH STRONG NORTH WINDS AND
RAIN CHANGING OVER TO SNOW.

SPOTTER ACTIVATION WILL NOT BE LIKELY THIS AFTERNOON OR EVENING...
BUT SOME WIND REPORTS WOULD BE HELPFUL.

RJK

COZ030-032>050-120600-

SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO
NATIONAL WEATHER SERVICE DENVER CO
215 PM MDT SAT OCT 11 1997

THIS OUTLOOK PERTAINS TO THE FOLLOWING COLORADO COUNTIES

ADAMS     ARAPAHOE     BOULDER   CLEAR CREEK   DENVER       DOUGLAS
ELBERT    GILPIN       GRAND     JACKSON       JEFFERSON    LARIMER
LINCOLN   LOGAN        MORGAN    PARK          PHILLIPS     SEDGWICK
SUMMIT    WASHINGTON   WELD

SYNOPSIS:  STRONG SOUTHWEST FLOW ALOFT CREATED FROM AN APPROACHING
UPPER LEVEL TROUGH TO THE WEST OF COLORADO IS BRINGING THE FORECAST
AREA VERY STRONG WINDS THIS AFTERNOON.  SOUTHWEST WINDS OF 35 TO 60
MPH WITH GUSTS AS HIGH AS 90 MPH CAN BE EXPECTED IN THE MOUNTAINS
AND FOOTHILLS.  THE PLAINS CAN EXPECT SOUTHEAST TO SOUTH WINDS AT 20
TO 40 MPH WINDS WITH GUSTS TO 60 MPH.

THE AIRMASS OVER THE FORECAST AREA WILL BE PRETTY UNSTABLE THIS
AFTERNOON AND INTO THIS EVENING.  A SURFACE TROUGH NOW STRETCHING
NORTH-SOUTH ALONG THE PLAINS WILL MOVE SLOWLY EAST THROUGH MID
EVENING.  AREAS TO THE WEST WILL NOT HAVE ENOUGH LOW LEVEL MOISTURE
TO PRODUCE ANY SIGNIFICANT THUNDERSTORMS...HOWEVER OVER THE FAR
EASTERN BORDER COUNTIES...ENOUGH LOW LEVEL MOISTURE MAY BE PRESENT
TO PRODUCE SOME STRONG STORMS LATE THIS AFTERNOON.

THE STRONG UPPER TROUGH TO THE WEST WILL MOVE INTO COLORADO LATE
TONIGHT AND SUNDAY BRINGING A SIGNIFICANT WINTER STORM TO THE
MOUNTAINS.  THE PLAINS CAN EXPECT TEMPERATURES 40 TO 50 DEGREES
COLDER ON SUNDAY COMPARED TO TODAY ALONG WITH STRONG NORTH WINDS AND
RAIN CHANGING OVER TO SNOW.

SPOTTER ACTIVATION WILL NOT BE LIKELY THIS AFTERNOON OR EVENING...
BUT SOME WIND REPORTS WOULD BE HELPFUL.

(RJK

COZ033>036-038-039>045-120200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
630PM MDT SAT OCT 11 1997

...HIGH WIND WARNING CANCELLED FOR FRONT RANGE FOOTHILLS AND
   NEARBY PLAINS...
...TORNADO WATCH CANCELLED FOR EASTERN ADAMS...EASTERN ARAPAHOE...
   EASTERN WELD AND MORGAN COUNTIES...

ALTHOUGH STRONG GUSTY WINDS CONTINUE OVER THE FRONT RANGE FOOTHILLS
AND NORTHEAST PLAINS THEY HAVE DECREASED IN INTENSITY AND NO LONGER
POSE A THREAT OF PRODUCING DAMAGING GUSTS.  AS A RESULT THE HIGH
WIND WARNING HAS BEEN CANCELLED AT 630 PM MDT FOR THE FRONT RANGE
FOOTHILLS AND NEARBY PLAINS IN LARIMER...BOULDER...DENVER...ADAMS
...ARAPAHOE...WELD...DOUGLAS AND ELBERT COUNTIES.  WINDS ARE EXPECTED
TO RANGE FROM 25 TO 40 MPH THROUGH THE REST OF THE EVENING.

A HIGH WIND WARNING DOES CONTINUE UNTIL 9 PM MDT FOR LOGAN...SEDGWICK
...PHILLIPS AND WASHINGTON COUNTIES.  WINDS IN THESE AREAS ARE EXPECTED
TO REMAIN IN THE 20 TO 40 MPH RANGE BUT GUSTS OF 60 TO 80 MPH ARE
STILL POSSIBLE FROM THUNDERSTORMS THAT WERE MOVING NORTH THROUGH
WASHINGTON AND LOGAN COUNTIES AT 630 PM MDT.

THE TORNADO WATCH FOR EASTERN WELD...MORGAN...EASTERN ADAMS AND
EASTERN ARAPAHOE COUNTIES HAS ALSO BEEN CANCELLED AT 630 PM MDT.
THE BAND OF THUNDERSTORMS THAT WERE THREATENING THIS AREA HAVE
MOVED EAST AND NOW STRETCH FROM NEBRASKA SOUTH THROUGH LOGAN...
WESTERN WASHINGTON INTO NORTHWEST LINCOLN COUNTY.  A TORNADO
WATCH STILL EXISTS FOR SEDGWICK...LOGAN...PHILLIPS...WASHINGTON
AND LINCOLN COUNTIES UNTIL 11 PM MDT AS WELL AS FOR COUNTIES IN
SOUTHEAST COLORADO.

DRIVERS OF LIGHTWEIGHT AND HIGH PROFILE VEHICLES SHOULD STILL BE
ALERT FOR STRONG DANGEROUS CROSSWINDS ESPECIALLY EAST OF A FORT
MORGAN TO LIMON LINE.

STAY TUNED TO NOAA WEATHER RADIO OR OTHER NEWS OUTLETS AS A VARIETY
OF WINTER WEATHER WARNINGS...ADVISORIES AND WATCHES ARE IN EFFECT
FOR MUCH OF COLORADO THROUGH SUNDAY.  ADDITIONAL STATEMENTS WILL BE
ISSUED CONCERNING THESE OTHER HIGHLIGHTS.

END...GCF...WSFO DENVER