Tornado Warning 26, NWS Denver/Boulder, CO

990 
WWUS55 KBOU 262046
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
246 PM MDT WED MAY 26 2010

COC001-031-123-262052-
/O.EXP.KBOU.TO.W.0026.000000T0000Z-100526T2045Z/
ADAMS CO-DENVER CO-WELD CO-
246 PM MDT WED MAY 26 2010

...THE TORNADO WARNING FOR EXTREME SOUTHWESTERN WELD...NORTHEASTERN
DENVER AND CENTRAL ADAMS COUNTIES WILL EXPIRE AT 245 PM MDT...

RADAR NO LONG INDICATES A TORNADO WITH THIS THUNDERSTORM.  THE STORM 
CONTINUES MOVING NORTHEASTWARD AT 15 MPH AND IS STILL CAPABLE OF 
PRODUCING LARGE DAMAGING HAIL.  IT IS CURRENTLY LOCATED 9 MILES 
NORTH OF DENVER INTERNATIONAL AIRPORT.

LAT...LON 3996 10456 3988 10461 3985 10469 3988 10479
      3996 10478 4003 10474 4002 10462
TIME...MOT...LOC 2042Z 215DEG 6KT 3994 10467

$$



RJK

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER CO
310 AM MDT WED MAY 26 2010

.SHORT TERM...SOUTHWEST FLOW ALOFT WILL PERSIST OVER COLORADO TODAY
AND TONIGHT. BIGGEST QUESTION TODAY WILL BE HOW MUCH THUNDERSTORM
ACTIVITY WILL OCCUR THIS AFTERNOON AND EVENING. SOUTHEAST WINDS WILL
CONTINUE TO ADVECT MOISTURE INTO THE AREA TODAY AND HAS BROUGHT LOW
CLOUDS AND PATCHY FOG TO NORTHEAST COLORADO THIS MORNING. THE CLOUDS
WILL LIKELY HANG ON THROUGH MID TO LATE MORNING...SO THIS WILL SLOW
HEATING TODAY. DEW POINTS IN THE MID 40S TO MID 50S PLUS CAPES OF
700 TO 1400 J/KG WILL YIELD SOME CONVECTIVE ACTIVITY. THROW IN
DECENT SHEAR AND A FEW OF THE STORMS COULD BECOME SEVERE. MAIN
CONCERNS WILL BE LARGE HAIL AND STRONG WIND GUSTS. AN ISOLATED
LANDSPOUT OR TORNADO CANNOT BE TOTALLY RULED OUT GIVEN THE VEERING
SHEAR PROFILE. WARM AIR ADVECTION ALOFT PLUS LOW CLOUDS SHIELDING
THE SURFACE THIS MORNING MAY LIMIT THUNDERSTORM ACTIVITY OR AT LEAST
DELAY IT UNTIL MID TO LATE AFTERNOON.

THE CHANCE FOR THUNDERSTORMS WILL LINGER INTO THE EVENING. EXPECT
THAT THE THUNDERSTORMS SHOULD HAVE MOVED OUT OF THE AREA BY
MIDNIGHT. WINDS JUST OFF THE SURFACE WILL SHIFT SOUTHWESTERLY AFTER
MIDNIGHT BRINGING DRIER AIR AND ENDING THE CHANCE FOR THUNDERSTORMS.

.LONG TERM...PROBABLY THE MOST NOTEWORTHY WEATHER DURING THE
UPCOMING EXTENDED PERIOD WILL BE THE BIG WARMUP THURSDAY AND FRIDAY.
LATEST MOS TEMP GUIDANCE IS INDICATING MAX TEMPS ON THE PLAINS IN
THE MID/UPPER 80S ON THURSDAY...AND UPPER 80S/LOWER 90S BY FRIDAY.
THE HIGH COUNTRY WILL ALSO FEEL THIS WARMUP. ABOVE NORMAL DAYTIME
TEMPERATURES AND ABOVE FREEZING NIGHT TIME TEMPS UP AROUND
TIMBERLINE SHOULD ACCELERATE SNOW MELT RUNOFF RESULTING IN FAST AND
ELEVATED WATER LEVELS IN MTN STREAMS AND CREEKS.

AN ABNORMALLY DEEP UPPER TROUGH FORMING OVER THE INTERMOUNTAIN
REGION NEXT 48 HOURS DRIVES HOT GENERALLY DRY AIR UP FROM THE DESERT
SOUTHWEST. WIND SPEEDS ALOFT NOT ALL THAT STRONG BUT STRONG ENOUGH
TO GENERATE GUSTY S-SWLY WINDS OF 15-25 MPH AREAWIDE BOTH DAYS. SRN
FTHLS COULD SEE A BIT MORE WIND BY FRIDAY WHICH WILL FURTHER LOWER
RHS AND RAISE TEMPS EAST OF THE CONT DVD...CONSEQUENTLY ELEVATING
THE WILDLAND FIRE DANGER. CAN'S RULE OUT ISOLATED TO WIDELY SCT
AFTERNOON/EVENING T-STORMS EACH DAY...MAINLY OVER AND NEAR THE FRONT
RANGE. BY SATURDAY A MAJORITY OF THE MODELS SHOW THE WESTERN TROUGH
PROPAGATING EASTWARD OVER THE NRN AND CNTRL ROCKY MTN REGION. THEY
ALSO SHOW A STAND UP PACIFIC COLD FRONT SWINGING OUT OF THE MTNS AND
ACROSS NERN COLORADO LATE SAT AFTERNOON AND EARLY SAT EVENING. ITS
ALONG THIS FNTL BNDRY THAT WE COULD SEE SCATTERED T-STORMS A FEW
POSSIBLY SEVERE MAINLY ACROSS THE NERN CORNER OF THE STATE AS THIS
FRONTAL BNDRY COLLIDES WITH A MOIST AND UNSTABLE SELY BNDRY LAYER
FLOW OUT NEAR THE ERN BORDER. STRONG SFC-500MB SUBSIDENCE IN THE
WAKE OF THIS FNTL BNDRY COULD AGAIN PRODUCE ANOTHER ROUND OF STG AND
VERY GUSTY DOWNSLOPE WINDS IN AND ALONG THE FRONT RANGE AND ON THE
ADJACENT PLAINS DURING THE EVENING HOURS. BY SUNDAY...SYSTEM MOVES
OUT AND A DRIER AND MORE STABLE AIRMASS MOVES IN FM THE WEST WITH A
WEAK UPPER LEVEL HIGH PRESSURE RIDGE.

&&

.AVIATION...LOW CLOUDS WILL REMAIN OVER THE AREA THROUGH 15Z AND
THEN DISSIPATE. CEILING WILL GENERALLY RUN 1000 TO 2000 FEET UNDER
THE LOW CLOUDS AND MAY OCCASIONALLY DIP BELOW 1000 FEET. WINDS WILL
STAY OUT OF THE EAST TO SOUTHEAST...AFTER 18Z SOUTHEAST WINDS WILL
INCREASE WITH GUSTS UP TO 30 KNOTS POSSIBLE. THERE WILL BE A CHANCE
FOR THUNDERSTORMS...MAINLY FROM 20Z-02Z. WIND GUSTS TO 40
KNOTS...BRIEF HEAVY RAIN AND HAIL WILL BE POSSIBLE FROM THE STORMS.

&&

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

MEIER/BAKER

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER CO
1047 AM MDT WED MAY 26 2010

COZ030>051-271200-
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-
1047 AM MDT WED MAY 26 2010

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

.DAY ONE...TODAY AND TONIGHT

A MOIST AIRMASS HAS MOVED INTO NORTHEAST COLORADO TODAY WHICH WILL
BECOME UNSTABLE THIS AFTERNOON AS DAYTIME HEATING CONTINUES.  WINDS
ACROSS THE PLAINS AND ALOFT ARE ALSO FAVORABLE FOR THE DEVELOPMENT
OF STRONG AND ORGANIZED THUNDERSTORMS.  SCATTERED THUNDERSTORMS ARE
EXPECTED TO DEVELOP AFTER 1 PM...INITIALLY OVER THE URBAN CORRIDOR.
THROUGH THE LATE AFTERNOON AND EVENING HOURS...THUNDERSTORMS ARE
EXPECTED TO SPREAD EASTWARD ACROSS THE PLAINS.  THUNDERSTORMS MAY
PRODUCE LOCALLY HEAVY RAINFALL...LARGE HAIL AND DAMAGING WINDS.  THE
THREAT OF TORNADOS ALSO EXISTS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

A FEW AFTERNOON AND EVENING THUNDERSTORMS WILL DEVELOP EACH DAY
THROUGH SATURDAY.  ENOUGH INSTABILITY AND WIND SHEAR WILL BE PRESENT
FOR A THREAT OF SEVERE WEATHER WITH LARGE HAIL AND DAMAGING WINDS
FROM THE STRONGER STORMS.  DRIER WEATHER SHOULD THEN PREVAIL SUNDAY
AND MEMORIAL DAY...BEFORE A SLIGHT CHANCE OF STORMS RETURNS TO MOST
OF THE FORECAST AREA TUESDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS EXPECTED FOR THIS AFTERNOON AND EVENING.

DANKERS/BARJENBRUCH

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
152 PM MDT WED MAY 26 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0149 PM     TORNADO          3 S BRIGHTON            39.94N 104.79W
05/26/2010                   ADAMS              CO   AMATEUR RADIO

0148 PM     HAIL             5 NE COMMERCE CITY      39.87N 104.86W
05/26/2010  M1.75 INCH       ADAMS              CO   TRAINED SPOTTER

0145 PM     TORNADO          4 W DENVER INTL AIRPORT 39.87N 104.75W
05/26/2010                   ADAMS              CO   PUBLIC

0133 PM     HAIL             COMMERCE CITY           39.81N 104.92W
05/26/2010  M2.00 INCH       ADAMS              CO   TRAINED SPOTTER

            WINDOW DAMAGE REPORTED

0131 PM     HAIL             7 E THORNTON            39.89N 104.82W
05/26/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0130 PM     HAIL             5 SSW BARR LAKE         39.88N 104.81W
05/26/2010  M1.50 INCH       ADAMS              CO   TRAINED SPOTTER

&&

FREDIN

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
200 PM MDT WED MAY 26 2010

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0151 PM     HAIL             2 SSE BRIGHTON          39.96N 104.78W
05/26/2010  M2.75 INCH       ADAMS              CO   LAW ENFORCEMENT

0151 PM     HAIL             1 NE THORNTON           39.90N 104.95W
05/26/2010  M1.75 INCH       ADAMS              CO   TRAINED SPOTTER

            EXTENSIVE DAMAGE TO ALL TREES IN VICINITY.

0149 PM     TORNADO          3 S BRIGHTON            39.94N 104.79W
05/26/2010                   ADAMS              CO   AMATEUR RADIO

0149 PM     HAIL             COMMERCE CITY           39.81N 104.92W
05/26/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0148 PM     HAIL             5 NE COMMERCE CITY      39.87N 104.86W
05/26/2010  M1.75 INCH       ADAMS              CO   TRAINED SPOTTER

0148 PM     HAIL             1 SE THORNTON           39.89N 104.95W
05/26/2010  M1.75 INCH       ADAMS              CO   TRAINED SPOTTER

0145 PM     TORNADO          4 W DENVER INTL AIRPORT 39.87N 104.75W
05/26/2010                   ADAMS              CO   PUBLIC

0145 PM     HAIL             1 ESE BRIGHTON          39.98N 104.79W
05/26/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0133 PM     HAIL             COMMERCE CITY           39.81N 104.92W
05/26/2010  M2.00 INCH       ADAMS              CO   TRAINED SPOTTER

            WINDOW DAMAGE REPORTED

0131 PM     HAIL             7 E THORNTON            39.89N 104.82W
05/26/2010  M1.00 INCH       ADAMS              CO   TRAINED SPOTTER

0130 PM     HAIL             5 SSW BARR LAKE         39.88N 104.81W
05/26/2010  M1.50 INCH       ADAMS              CO   TRAINED SPOTTER

&&

FREDIN