Severe Thunderstorm Warning 78, NWS Denver/Boulder, CO

COZ030-032>050-250600-

SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO
NATIONAL WEATHER SERVICE DENVER CO
1110 AM MDT TUE JUN 24 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:  A COLD FRONT HAD PUSHED THROUGH ALL OF NORTHEAST COLORADO
THIS MORNING BRINGING DRIER AND MORE STABLE AIR TO THE REGION.
HOWEVER...A SECONDARY PUSH OF MOIST AIR WAS NOW BACKING INTO
NORTHEAST COLORADO FROM NEBRASKA.  THIS BOUNDARY CURRENTLY EXTENDED
FROM THE COLORADO BORDER NEAR CHEYENNE TO NEAR AKRON AND WRAY.

AS THIS BOUNDARY CONTINUES TO MOVE BACK TOWARD THE FOOTHILLS...THE
INCREASE IN MOISTURE AND JUST ENOUGH SURFACE HEATING SHOULD COMBINE
TO PRODUCE STRONG TO SEVERE THUNDERSTORMS THIS AFTERNOON.  THE BEST
INSTABILITY AND THUS SEVERE WEATHER THREAT BY LATE AFTERNOON WILL BE
FOUND ALONG THE FOOTHILLS AND THEN ACROSS THE MONUMENT RIDGE TOWARD
LIMON AND POINTS SOUTH.  STORMS WILL FIRST DEVELOP IN THE FOOTHILLS
EARLY THIS AFTERNOON...AND THEN TRY TO PUSH ONTO THE PLAINS.
INITIALLY...THE AIRMASS ON THE PLAINS WILL BE TOO STABLE...BUT WITH
ADDITIONAL DAYTIME HEATING THE CAP IS EXPECTED TO BREAK BY 4 PM.
THE THREAT OF SEVERE WEATHER INCLUDING LARGE HAIL...A FEW
TORNADOES...AND HEAVY RAINFALL WILL THEN EXIST IN THE ABOVE MENTIONED
AREAS INTO THE EARLY EVENING.

LOCATIONS NORTH AND EAST OF A LINE FROM GREELEY TO LAST CHANCE
WILL LIKELY BE TOO STABLE FOR DEVELOPMENT OF SEVERE WEATHER.

SPOTTER ACTIVATION WILL LIKELY BE REQUIRED FOR LOCATIONS SOUTH AND
WEST OF DENVER AFTER 3 PM.

BARJENBRUCH

COZ030-032>050-260600-

SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO
NATIONAL WEATHER SERVICE DENVER CO
1115 AM MDT TUE JUN 24 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:  IT WILL BE A VERY ACTIVE AFTERNOON AND EVENING FOR
CONVECTION OVER NORTHEAST COLORADO.  SEVERAL FACTORS WILL COME
TOGETHER TO PRODUCE WIDESPREAD...POSSIBLY SEVERE THUNDERSTORMS WITH
HEAVY RAIN...ESPECIALLY EAST OF GREELEY TO LIMON LINE THIS
EVENING.

SOUTHEAST WINDS WILL CONTINUE TO FEED MOIST AIR ACROSS NORTHEAST
COLORADO INTO SOUTHEAST WYOMING.  A WEAK UPPER TROUGH WILL ALSO HELP
FOCUS THE THUNDERSTORMS IN NORTHEAST COLORADO LATE THIS AFTERNOON
AND EVENING.  A SURFACE LOW WILL STRENGTHEN EAST OR NORTHEAST OF
DENVER WHICH WILL ALSO ACT AS A FOCUS FOR THUNDERSTORMS.  WINDS WILL
TURN CLOCKWISE WITH HEIGHT...SO THUNDERSTORMS WILL ALSO BE CAPABLE
OF PRODUCING TORNADOES.

THUNDERSTORMS WILL RAPIDLY FORM OVER THE HIGHER TERRAIN...THE
FOOTHILLS...PALMER DIVIDE AND CHEYENNE RIDGE EARLY THIS AFTERNOON...
AND DEVELOP TO THE PLAINS BEFORE 2PM.  BY EVENING... THUNDERSTORMS
SHOULD BEGIN DECREASING OVER THE URBAN CORRIDOR...WHILE
THUNDERSTORMS BECOME WIDESPREAD TO THE NORTHEAST OF GREELEY AND
LIMON.  WE WILL HAVE TO WATCH FOR...TORNADOES...LARGE HAIL...AND
POSSIBLE FLOODING.

SPOTTERS WILL LIKELY BE ACTIVATED AROUND 1PM.

RTG

COZ030-032>050-270600-

SIGNIFICANT WEATHER OUTLOOK FOR NORTHEAST AND NORTH CENTRAL COLORADO
NATIONAL WEATHER SERVICE DENVER COLORADO
1145 AM MDT TUE JUN 24 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: THE SURFACE AIRMASS HAS SLIGHTLY DRIED TODAY FROM
YESTERDAY AND THERE HAS BEEN SOME SLIGHT WARMING ALOFT.  IN SPITE
OF THESE TWO FACTORS THERE IS STILL ENOUGH MOISTURE PRESENT FOR
THUNDERSTORM DEVELOPMENT WHEN COUPLED WITH THE EXPECTED SIGNIFICANT
DAYTIME HEATING.  SOUTHEAST SURFACE FLOW SHOULD CONTINUE TO DEVELOP
AND INCREASE OVER THE PLAINS THIS AFTERNOON CREATING A CONVERGENCE
LINE FOR THUNDERSTORMS TO DEVELOP UPON TO THE EAST OF THE DENVER
METRO AREA.   EXPECT STORMS TO DEVELOP OVER THE HIGHER TERRAIN BY
1:30 PM...AND OUT OVER THE PLAINS BY 4 PM.  SOME OF THE STORMS MAY
BE SEVERE OVER MOST OF THE PLAINS...DUE TO LARGE HAIL AND STRONG
WINDS.  THE BEST THREAT OF SEVERE WEATHER WILL BE OVER LINCOLN...
WASHINGTON...LOGAN....PHILLIPS...AND SEDGWICK COUNTIES.

SPOTTER ACTIVATION MAY BE NEEDED AFTER 3 PM.         RJK