Severe Thunderstorm Warning 237, NWS Denver/Boulder, CO

000 
WWUS55 KBOU 212055
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
254 PM MDT WED SEP 21 2005

COC001-031-212130-
/O.CON.KBOU.SV.W.0237.000000T0000Z-050921T2130Z/
ADAMS CO-DENVER CO-
254 PM MDT WED SEP 21 2005

...A SEVERE THUNDERSTORM WARNING CONTINUES UNTIL 330 PM MDT FOR
NORTHEASTERN DENVER AND WESTERN ADAMS COUNTIES...

AT 251 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED OVER EXTREME NORTH CENTRAL
AURORA...OR ABOUT 19 MILES EAST OF DENVER...MOVING EAST AT 20
MPH.

LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO 
DENVER INTERNATIONAL AIRPORT...NORTHEASTERN DENVER... NORTHERN 
AURORA.

LAT...LON 3995 10480 3975 10480 3975 10452 3995 10453

$$

RPK

000 
WWUS55 KBOU 212112
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
312 PM MDT WED SEP 21 2005

COC001-031-212122-
/O.CAN.KBOU.SV.W.0237.000000T0000Z-050921T2130Z/
ADAMS CO-DENVER CO-
312 PM MDT WED SEP 21 2005

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DENVER AND
WESTERN ADAMS COUNTIES IS CANCELLED...

THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED AND IS NO
LONGER EXPECTED TO PRODUCE SEVERE WEATHER.

LAT...LON 3995 10480 3975 10480 3975 10452 3995 10453

$$

RPK

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER CO
345 AM MDT WED SEP 21 2005

.SHORT TERM...GRADUAL MOISTENING FROM THE WEST TODAY. MOUNTAIN DEW
POINTS ARE BACK IN THE 20S AFTER HOVERING CLOSER TO ZERO FOR THE
LAST WEEK. STILL A BIT OF A DOUBLE STRUCTURE TO THE JET...WITH A
RIPPLE ON THE SOUTH SIDE COMING ACROSS COLORADO DURING THE DAY AND A
MUCH STRONGER SPEED LIFTING OVER WYOMING TONIGHT. PLAINS WINDS WILL
BE LIGHT AND THOUGH THERE HAS BEEN SOME INCREASE IN MOISTURE IT
SHOULD STILL BE MARGINAL AT BEST FOR STORM DEVELOPMENT THIS
AFTERNOON. DURING THE LATE AFTERNOON AND EVENING WE SHOULD HAVE A
DISJOINTED COMBINATION OF CONVECTIVE OUTFLOW FROM STORMS ASSOCIATED
WITH THE NORTHERN JET AND THE COLD FRONT NOW ACROSS SOUTHERN
MONTANA. CURRENT PLAN IS FOR WEST WINDS FIRST WITH ISOLATED
CONVECTION...THEN A SHIFT TO NORTHEAST IN THE EVENING WITH SEVERAL
HOURS OF SHOWERS/STORMS. THIS STILL LOOKS REASONABLE. MAIN CHANGE TO
GRIDS WAS TO TRY TO REFINE THE TIMING A BIT BETTER TO FOCUS ON THE
LATE AFTERNOON/EVENING IN THE MOUNTAINS AND OVERNIGHT ON THE PLAINS.

.LONG TERM...SFC CDFNT WL SWEEP INTO THE PLAINS WED NIGHT.  STG NELY
WINDS JUST OFF THE DECK ARE EVIDENT IN THE CROSS SECTIONS...AND ARE
PROGGED TO CONTINUE INTO THE MRNG HRS THURS.  UPR TROF WL PASS INTO
NEBR BY THEN...TAKING WITH IT ALL OF THE UPLIFT AND PCPN GENERATING
MECHANISMS.  WL REDUCE POPS TO ISOLD ACRS THE ENTIRE REGION FOR
THURS MRNG AS PRECIP SHOULD BE LARGELY COINCIDENT WITH UPR TROF
PASSAGE.  REST OF THE DAY PROMISES TO BE COOL AND MOSTLY CLOUDY ACRS
THE PLAINS.  MSTR WL THIN OUT IN THE AFTN...SO THERE COULD BE A
PERIOD WITH A FEW PEEKS OF SUN BEFORE CONVECTIVE TEMPS ARE REACHED
AND RESULTING CUMULUS DVLPMENT BLOTS OUT THE SUN.  WL GO FOR BROKEN
SKIES FOR THE ENTIRE DAY WITH TEMPS IN THE UPR 60S.  ISOLD SHWRS
PSBL IN THE AFTN SINCE MSTR WL CONTINUE TO BE DECENT...BUT
CONDITIONS WL BE TOO STABLE TO ALLOW FOR MUCH TSTM DVLPMENT.  WILL
REMOVE POPS ENTIRELY IN THE NERN CORNER.

FRIDAY LOOKS DRIER AND WARMER AS SWLY FLOW RETURNS TO THE AREA.
MSTR CONTINUES TO ABOUND IN THE MID LVLS OF THE ATMS...BUT IT WL
PBLY BE TOO STBL ON THE PLAINS FOR CONVECTION...BUT WL ADD SOME LOW
POPS IN THE HIGH COUNTRY FOR SOME ISOLD ELEVATED CONVECTION.  TEMPS
SHOULD RECOVER WELL INTO THE 70S WITH SOME LOWER 80S PSBL NEAR THE
FTHILLS.  BEYOND FRIDAY...MDLS QUITE A BIT SLOWER WITH TROF ALG THE
WEST COAST.  LATEST GFS DOES NOT BRING THIS TROF ACRS OUR AREA UNTIL
MID WEEK NEXT WEEK.  SOME ENSEMBLE MEMBERS NOW POINTING TO THIS TROF
PHASING WITH SUBSTANTIAL COLD AIR FM CANADA.  THIS WOULD SPELL THE
FIRST GOOD COLD WAVE FOR MUCH OF THE CNTRL CONUS THURS.  WL NOT
CHANGE MUCH IN DAYS 4-7 AT THIS TIME...BUT SIGNS OF FALL MAY NOT BE
FAR OFF.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...NONE.

&&

GIMMESTAD/046

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER CO
1104 AM MDT WED SEP 21 2005

COZ030>051-221200-
JACKSON COUNTY BELOW 9000 FEET-WEST JACKSON AND WEST GRAND
COUNTIES ABOVE 9000 FEET-GRAND AND SUMMIT COUNTIES BELOW 9000
FEET-SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/
NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET-SOUTH AND SOUTHEAST
GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/GILPIN/CLEAR CREEK/
SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE 9000 FEET-LARIMER AND
BOULDER COUNTIES BETWEEN 6000 AND 9000 FEET-JEFFERSON AND WEST
DOUGLAS COUNTIES ABOVE 6000 FEET/GILPIN/CLEAR CREEK/NORTHEAST PARK
COUNTIES BELOW 9000 FEET-CENTRAL AND SOUTHEAST PARK COUNTY-LARIMER
COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY-BOULDER AND JEFFERSON
COUNTIES BELOW 6000 FEET/WEST BROOMFIELD COUNTY-NORTH DOUGLAS
COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND ARAPAHOE COUNTIES/
EAST BROOMFIELD COUNTY-ELBERT/CENTRAL AND EAST DOUGLAS COUNTIES
ABOVE 6000 FEET-NORTHEAST WELD COUNTY-CENTRAL AND SOUTH WELD
COUNTY-MORGAN COUNTY-CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES-
NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN
COUNTY-SOUTHEAST ELBERT COUNTY BELOW 6000 FEET/SOUTH LINCOLN
COUNTY-LOGAN COUNTY-WASHINGTON COUNTY-SEDGWICK COUNTY-PHILLIPS
COUNTY-
1104 AM MDT WED SEP 21 2005

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL
COLORADO.

.DAY ONE...TODAY AND TONIGHT

ISOLATED THUNDERSTORMS WILL DEVELOP OVER THE NORTHERN MOUNTAINS
EARLY THIS AFTERNOON...GRADUALLY SPREADING OVER THE URBAN CORRIDOR
AND EASTERN PLAINS LATER THIS AFTERNOON AND EVENING. GUSTY WINDS TO
50 MPH AND BRIEF RAIN WILL ACCOMPANY THE STRONGER STORMS. A COLD
FRONT WILL BE MOVING ACROSS EASTERN COLORADO THIS EVENING AND
OVERNIGHT WITH NORTHERLY WIND GUSTS TO 35 MPH WITH THE FRONT.
ISOLATED THUNDERSTORMS MAY ALSO DEVELOP ALONG THE FRONT AS IT MOVES
SOUTHWARD OVER THE PLAINS.

SEVERE STORMS ARE NOT EXPECTED AS THE LOW LEVELS OF THE ATMOSPHERE
ARE STILL RATHER DRY. AGAIN...GUSTY WINDS TO 50 MPH WILL BE THE MAIN
THREAT WITH STORMS THIS AFTERNOON AND TONIGHT.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

SWE/RJK