Severe Thunderstorm Warning 98, NWS Denver/Boulder, CO

000 
WWUS55 KBOU 172120
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
320 PM MDT THU JUL 17 2008

COC001-005-039-073-121-172145-
/O.CON.KBOU.SV.W.0098.000000T0000Z-080717T2145Z/
WASHINGTON CO-LINCOLN CO-ELBERT CO-ARAPAHOE CO-ADAMS CO-
317 PM MDT THU JUL 17 2008

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM MDT
FOR SOUTHEASTERN ADAMS...EASTERN ARAPAHOE...NORTHEASTERN ELBERT...
NORTH CENTRAL LINCOLN AND SOUTHWESTERN WASHINGTON COUNTIES...

AT 317 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING LARGE DAMAGING 
HAIL UP TO GOLF BALL SIZE AND DAMAGING WINDS UP TO 60 MPH.  THIS 
STORM WAS LOCATED OVER EAST CENTRAL ARAPAHOE COUNTY...OR 27 MILES 
NORTH OF LIMON...MOVING SOUTHEAST AT 26 MPH.

THE SEVERE THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF THE
WARNED COUNTIES.

THIS STORM HAS A HISTORY OF PRODUCING DESTRUCTIVE WINDS AND LARGE
DAMAGING HAIL. SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY
AWAY FROM WINDOWS

AT 255 PM MDT...STORM CHASERS 10 MILES NORTHEAST OF DEER TRAIL 
REPORTED GOLFBALL SIZE HAIL FROM THIS STORM.  AT 315 PM MDT...THERE 
WERE ALSO INDICATIONS FROM THE DOPPLER RADAR THAT STRONG DAMAGING 
WINDS WERE OCCURRING ON THE SOUTHWEST SIDE OF THE STORM.  

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A STRONG
BUILDING. DAMAGING WIND...LARGE HAIL...VERY HEAVY RAIN...AND DEADLY
LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY
FROM WINDOWS UNTIL THE STORM HAS PASSED.

LAT...LON 3983 10379 3958 10347 3945 10371 3976 10409
TIME...MOT...LOC 2117Z 311DEG 22KT 3964 10375

$$

DANKERS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER CO
253 AM MDT THU JUL 17 2008

.SHORT TERM...UPPER LEVEL RIDGE TO FLATTEN SOME TODAY AS A SHORT
WAVE MOVES ACROSS THE REGION. THIS WILL RESULT IN SLIGHTLY COOLER
TEMPERATURES. EVEN THOUGH A WEAK COLD FRONT IS CURRENTLY MOVING
ACROSS THE PLAINS...MOST LOCATIONS WILL BE NEAR THE 90 DEGREE MARK.
MOISTURE TO FINALLY INCREASE OVER THE AREA TODAY. PRECIPITABLE WATER
VALUES WILL BE OVER AN INCH FOR THE LOWER ELEVATIONS. SHOULD SEE
SCATTERED THUNDERSTORMS FORM DURING THE AFTERNOON AND CONTINUE INTO
THE EVENING. BEST CHANCE FOR STORMS WILL BE OVER THE FAR EASTERN
PLAINS WHERE THE GREATEST MOISTURE WILL BE. HEAVY RAIN WILL BE THE
BIGGEST CONCERN WITH THE STORMS. SHEAR WILL BE FAVORABLE FOR
MULTICELLULAR STORMS...SO COULD SEE SOME TRAINING OF STORMS OVER THE
SAME AREA. THIS COMBINED WITH THE SLOW STORM MOVEMENT (LESS THAN 20
MPH) AND THE INCREASED MOISTURE COULD POSE A THREAT FOR FLASH
FLOODING. GREATEST THREAT FOR THIS AND A SEVERE STORM WILL BE EAST
OF DENVER WHERE THE HIGHER MOISTURE AND CAPES WILL BE. LOW LEVEL
MOISTURE TO INCREASE TONIGHT AND BY 12Z FRIDAY DEW POINTS WILL BE
WELL INTO THE 50S ALL THE WAY TO THE FOOTHILLS SETTING UP ANOTHER
CHANCE FOR STORMS FRIDAY. ENOUGH MOISTURE MAY BE PRESENT FOR LOW
CLOUDS TO DEVELOP.

.LONG TERM...ON FRIDAY...A MOIST AMS WILL REMAIN IN PLACE THROUGH
FRIDAY MORNING.  ALTHOUGH LOW LEVEL UPSLOPE WILL BE WEAKENING AS THE
SFC HIGH OVER THE GREAT PLAINS SHIFTS EAST...BOTH MDLS SHOW PLENTY
OF MSTR AND INSTBY IN THE AFTN.  BOTH THE GFS/NAM SOUNDINGS INDICATE
PW VALUES OF OVER ONE INCH AND CAPES FM 1400-1700 J/KG.  SELY WINDS
SHUD AID IN THE FORMATION OF A DENVER CYCLONE IN THE AFTN.  BEST
COVERAGE FOR TSTMS WOULD APPEAR TO BE IN AND NEAR THE FRONT RANGE
FOOTHILLS AND PALMER DIVIDE.  MAIN ADJUSTMENT INVOLVED KEEPING SLGT
CHC POPS IN THE MORNING WITH SCT COVERAGE IN THE AFOREMENTIONED
AREAS IN THE AFTN AND EVNG.  THERE AGAIN APPEAR TO BE SOME UPPER
LEVEL SUPPORT WITH A PASSAGE OF A SHORT WAVE TROF TO THE N OF THE
STATE DURING THE AFTN/EVNG.  ALSO OPTED TO COOL AFTN TEMPERATURES
FOR FRIDAY...WITH PLENTY OF APPARENT CLOUD COVER...ESPECIALLY DURING
THE MORNING HOURS.  OVERALL THE REST OF THE GRIDS LOOK GOOD.  AN
UPPER LEVEL RIDGE WILL REBUILD OVER CO DURING THE WEEKEND WITH A
DRIER AND WARMER AIRMASS IN PLACE.  INCRG SUBSIDENCE WILL DCRS THE
POTENTIAL FOR ANY TSTMS AS THE RIDGE BUILDS OVER THE 4CORNERS
REGION.

&&

.AVIATION...AIRMASS TO BECOME UNSTABLE THIS AFTERNOON WITH SCATTERED
THUNDERSTORMS DEVELOPING AFTER 18Z. MAIN THREAT WITH THE STORMS WILL
BE HEAVY RAIN AND GUSTY WINDS. MOISTURE WILL INCREASE THURSDAY NIGHT
AND MAY EVEN SEE A FEW LOW CLOUDS FORM BETWEEN 08-14Z FRIDAY ACROSS
THE PLAINS.

&&

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

&&

MEIER/COOPER

HAZARDOUS WEATHER OUTLOOK...CORRECTED
NATIONAL WEATHER SERVICE DENVER CO
1108 AM MDT THU JUL 17 2008

COZ030>051-181200-
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-
1108 AM MDT THU JUL 17 2008

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP ACROSS NORTHEAST
COLORADO THROUGH THIS AFTERNOON...CONTINUING INTO THE EVENING HOURS.
THE STORMS WILL BE SLOW MOVING AND COULD PRODUCE HEAVY RAIN WITH
LOCALIZED FLASH FLOODING. A FEW OF THE STORMS ACROSS THE EASTERN
PLAINS MAY ALSO BECOME SEVERE WITH LARGE HAIL THE BIGGEST THREAT.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THE BEST CHANCE OF THUNDERSTORMS DURING THIS PERIOD WILL BE ON
FRIDAY.  WHILE ISOLATED SHOWERS AND THUNDERSTORMS MAY LINGER INTO
THE EARLY MORNING HOURS FRIDAY...ANOTHER ROUND OF SCATTERED
THUNDERSTORMS CAN BE EXPECTED IN THE AFTERNOON AND EVENING...
ESPECIALLY IN THE SOUTHERN FRONT RANGE FOOTHILLS AND PALMER DIVIDE.
THEY WILL AGAIN BE SLOW MOVING AND CAPABLE OF PRODUCING HEAVY
RAINFALL ALONG WITH A THREAT OF FLASH FLOODING.  ENOUGH INSTABILITY
WILL ALSO EXIST FOR A COUPLE OF SEVERE STORMS WITH LARGE HAIL AND
DAMAGING WINDS.

IT WILL TURN DRIER AND WARMER AGAIN FOR THE WEEKEND INTO EARLY NEXT
WEEK...WITH ONLY A SLIGHT CHANCE OF AFTERNOON AND EVENING
THUNDERSTORMS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED ACROSS THE EASTERN PLAINS THIS
AFTERNOON.

D-L/DBB

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DENVER CO
232 PM MDT THU JUL 17 2008

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

0216 PM     HAIL             14 NE BYERS             39.85N 104.04W
07/17/2008  M1.75 INCH       ADAMS              CO   TRAINED SPOTTER

            ESTIMATED WIND GUSTS TO 50 MPH. HOUSE WINDOWS BROKEN BY
            HAIL BLOWN BY WIND.

&&

BENTON