Hail and Damaging Winds in Colorado, June 20, 2003

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GOODLAND KS
200 PM MDT FRI JUN 20 2003

FORECAST PROBLEM WILL BE CHANCES OF PRECIPITATION THROUGH SATURDAY
THEN HOW HOT FOR TEMPERATURES SATURDAY THROUGH TUESDAY OF NEXT
WEEK.

19Z SURFACE MAP ANALYSIS SHOWED A RIDGE OF HIGH PRESSURE FROM THE
GREAT LAKES SOUTHWEST INTO KANSAS AND OKLAHOMA. A TROUGH OF LOW
PRESSURE EXTENDED FROM MONTANA SOUTHWARD INTO COLORADO AND UTAH. IR
AND WATER VAPOR SATELLITE IMAGERY SHOWED A VIGOROUS MID AND UPPER
LEVEL SHORTWAVE SPINNING NORTHEAST INTO SOUTHERN COLORADO.

MODELS INITIALIZED WELL THIS MORNING WITH RESPECT TO POSITION AND
PROJECTED MOVEMENT OF SURFACE TROUGH TO OUR WEST AS WELL AS WITH
SHORTWAVE MOVING THROUGH COLORADO TOWARD WESTERN KANSAS.

WILL GO WITH A BLEND OF ETA AND GFS MODELS OUT THROUGH DAY 3 IN
THIS FORECAST PACKAGE.

FOR TONIGHT MOISTURE AND DYNAMICS COME TOGETHER AS THETA E AXIS NORTH
TO SOUTH OVER EASTERN COLORADO SLIDES EASTWARD. SURFACE TROUGH ALSO
MOVES SLOWLY EAST. GOOD SOUTH TO SOUTHEAST WINDS CONTINUE TO BRING
LOTS OF MOISTURE AND THIS COUPLED WITH MIDDLE AND UPPER LEVEL
SHORTWAVE WILL HELP TO DEVELOP SCATTERED THUNDERSTORMS FROM WEST TO
EAST ACROSS THE FORECAST AREA. WILL GO WITH LIKELY POPS WESTERN 2/3
WITH CHANCE POPS OUT EAST. WILL GO CLOSE TO GUIDANCE TEMPERATURES IN
THE UPPER 50S TO LOWER 60S.

FOR SATURDAY THROUGH SATURDAY NIGHT STRONG SUBSIDENCE TAKES HOLD
FROM WEST TO EAST ACROSS FORECAST AREA. MODELS STILL SHOW SOME LOW
AND MIDDLE LEVEL MOISTURE OVER EASTERN 2/3 OF FORECAST AREA. WITH
WARMER TEMPERATURES EXPECTED WILL CARRY A SLIGHT CHANCE FOR
THUNDERSTORMS FROM KANSAS AND COLORADO BORDER EASTWARD. FOR
SATURDAY A PERIOD OF DRY WEATHER BEGINS AS SKIES WILL BE MOSTLY
CLEAR. WILL GO CLOSE TO GUIDANCE TEMPERATURES IN THE MIDDLE TO
UPPER 80S FOR HIGHS AND LOWS AROUND 60.

FOR SUNDAY THROUGH TUESDAY EXPECT STRONG SUBSIDENCE TO CONTINUE
ACROSS THE FORECAST AREA WITH MOSTLY SUNNY SKIES SUNDAY AND MONDAY.
SKIES WILL BE CLEAR SUNDAY NIGHT. DAYTIME TEMPERATURES WILL WARM UP
INTO THE 90S ALL ZONES SUNDAY THROUGH TUESDAY.

FOR WEDNESDAY THROUGH THURSDAY WILL NOT MAKE MUCH CHANGE FROM
PREVIOUS FORECAST EXPECT TO CARRY CHANCE POPS FOR THUNDERSTORMS ON
THURSDAY AS WELL AS WEDNESDAY. A SURFACE COLD FRONT AS WELL AS AN
UPPER LEVEL SHORTWAVE WILL MOVE THROUGH THE FORECAST AREA ALONG
WITH MORE MOISTURE. WILL CARRY CHANCE OF THUNDERSTORMS WEDNESDAY AND
THURSDAY.

WILL KEEP FRIDAY DRY BEHIND PREVIOUSLY MENTIONED SYSTEM WITH
DAYTIME TEMPERATURES IN MIDDLE TO UPPER 80S AND LOWS IN THE 60S.

.GLD...NONE.

LAMMERS

COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-211200-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE GOODLAND KS
954 AM MDT FRI JUN 20 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHWEST KANSAS...EXTREME
SOUTHWEST NEBRASKA...AND EAST CENTRAL COLORADO.

.DAY ONE...TODAY AND TONIGHT

A SURFACE TROUGH OVER EASTERN COLORADO WILL CONTINUE TO STRENGTHEN
THROUGH THE DAY. AS A RESULT...BREEZY TO WINDY SOUTHERLY WINDS WILL
INCREASE LOW LEVEL MOISTURE AND INSTABILITY ACROSS THE REGION.
A LOW LEVEL CONVERGENCE AXIS WILL DEVELOP NEAR THE COLORADO AND
KANSAS BORDER LATE THIS AFTERNOON. AN UPPER LEVEL DISTURBANCE WILL
MOVE INTO EASTERN COLORADO LATE IN THE AFTERNOON. AS A RESULT...
SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP NEAR THE COLORADO AND
KANSAS STATELINE LATE IN THE AFTERNOON. THESE STORMS WILL THEN MOVE
ACROSS THE REST OF THE AREA THROUGH THE OVERNIGHT HOURS. STORM MOTION
WILL BE NORTHEAST AROUND 35 MPH.

THUNDERSTORMS COULD BECOME SEVERE ANYWHERE IN THE AREA. HOWEVER...
THE BEST CHANCE FOR WIDESPREAD HAZARDOUS WEATHER WILL BE WEST OF A
LINE FROM MCCOOK NEBRASKA TO HOXIE TO GOVE. LARGE HAIL AND DAMAGING
WINDS WILL BE THE MAIN THREATS. HOWEVER...DUE TO A FAVORABLE WIND
PROFILE THROUGH THE MID LEVELS OF THE ATMOSPHERE...A FEW TORNADOES
WILL BE POSSIBLE.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THE NEXT CHANCE FOR THUNDERSTORMS IS ON WEDNESDAY. HOWEVER...
NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE LIKELY BEGINNING LATE THIS AFTERNOON FOR
LOCATIONS NEAR THE KANSAS AND COLORADO BORDER. SPOTTER ACTIVATION
WILL BE NEEDED OVER THE ENTIRE AREA TONIGHT.

SR

COZ090>092-KSZ001>004-013>016-027>029-041-042-NEZ079>081-210200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GOODLAND KS
1259 PM MDT FRI JUN 20 2003

THE NATIONAL WEATHER SERVICE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF EASTERN COLORADO EFFECTIVE UNTIL 800 PM
MDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 75 STATUTE MILES EAST AND WEST
OF A LINE FROM 60 MILES NORTH NORTHWEST OF AKRON COLORADO TO 55
MILES EAST SOUTHEAST OF TRINIDAD COLORADO.

YUMA...KIT CARSON AND CHEYENNE COUNTIES OF COLORADO ARE INCLUDED IN
THE TORNADO WATCH.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

SR

KSZ001>003-013>015-027>029-041-042-NEZ079>081-210400-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GOODLAND KS
428 PM MDT FRI JUN 20 2003

THE STORM PREDICTION CENTER HAS ISSUED TORNADO WATCH 554 FOR
PORTIONS OF NORTHWEST KANSAS AND EXTREME SOUTHWEST NEBRASKA EFFECTIVE
IMMEDIATELY UNTIL 10 PM MDT (11 PM CDT). THE FOLLOWING COUNTIES
ARE INCLUDED IN THE WATCH:

IN NORTHWEST KANSAS...CHEYENNE...SHERMAN...WALLACE...GREELEY...
RAWLINS...THOMAS...LOGAN...WICHITA...DECATUR...SHERIDAN...GOVE

IN EXTREME SOUTHWEST NEBRASKA...DUNDY...HITCHCOCK...RED WILLOW

TORNADOES...HAIL TO 2 INCHES IN DIAMETER...WIND GUSTS TO 70 MPH...AND
DANGEROUS LIGHTNING ARE POSSIBLE ACROSS THIS AREA.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE
FOR TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.

STAY TUNED TO NOAA WEATHER RADIO...COMMERCIAL RADIO OR TELEVISION
STATIONS...OR YOUR CABLE TELEVISION SERVICE PROVIDER FOR LATER
STATEMENTS CONCERNING THIS DANGEROUS SEVERE WEATHER THREAT.

DDT