Severe Thunderstorm Warning 56, NWS Denver/Boulder, CO

000 
WWUS55 KBOU 112125
SVSBOU

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
325 PM MDT WED MAY 11 2005

COC001-005-121-112145-
/O.CON.KBOU.SV.W.0056.000000T0000Z-050511T2145Z/
WASHINGTON CO-ARAPAHOE CO-ADAMS CO-
325 PM MDT WED MAY 11 2005

...A SEVERE THUNDERSTORM WARNING CONTINUES UNTIL 345 PM MDT FOR
SOUTHEASTERN ADAMS...EASTERN ARAPAHOE AND SOUTHWESTERN WASHINGTON
COUNTIES...

AT 318 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS
LOCATED 3 MILES SOUTHWEST OF LAST CHANCE...OR ABOUT 31 MILES NORTH OF
LIMON...MOVING NORTHEAST AT 25 MPH.

LOCATIONS REMAINING IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
WOODLIN SCHOOL...LINDON AND LAST CHANCE.

LAT...LON 3966 10395 3957 10377 3981 10319 4004 10341

$$
DANKERS

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER CO
240 PM MDT WED MAY 11 2005

.SHORT TERM....MOST OF CONVECTION ORIENTED ALONG A NORTH-SOUTH
LINE FROM CENTRAL ADAMS COUNTY SOUTH INTO WESTERN ELBERT COUNTY.
LAPS SHOWING BEST CAPES ALONG THE PALMER DIVIDE INTO LINCOLN...
MAINLY LESS THAN 1000 J/KG.  STORMS HAVE BEEN BATTLING A
PREDOMINATELY STABLE AIRMASS...AND HAVING A HARD TIME GETTING
ORGANIZED.  STILL SOME CHANCE FOR A FEW SEVERE STORMS ACROSS EASTERN
ELBERT AND LINCOLN COUNTIES WHERE THE CAPES ARE AT A MAXIMUN.  ALSO
THIS AREA WAS NEARLY VOID OF THE LOW CLOUD DECK WHICH EARLIER
ENGULFED MOST OF NORTHEAST COLORADO. LATEST FORECAST SOUNDINGS SHOW
HELICITIES OVER 300M2/S2 THROUGH 00Z...THEN A DRAMATIC DROP OFF.
TORNADO WATCH BEING ISSUED FOR LINCOLN COUNTY AND POINTS SOUTH AND
EAST THROUGH 03Z.  FURTHER WEST AND NORTH...ACTIVITY MAINLY
STRATIFORM.  MORE CONVECTIVE STUFF ACROSS MOUNTAINS WHICH IS IN
CLOSER PROXIMITY TO UPPER LOW OVER NORTHERN UTAH.  ACTIVITY SHOULD
BE ON THE DECREASE DURING THE EVENING AS COMBINATION OF DRIER MID
LEVEL AIR AND QG DESCENT MOVES ACROSS.  WAS TEMPTED TO DROP ALL
MENTION OF PRECIPITATION OVERNIGHT...BUT THE PROXIMITY TO THE UPPER
LOW...WILL KEEP SOME LIGHT PRECIPITATION GOING. BOUNDARY LAYER WIND
AND HUMIDITY PROGS SUGGEST LOW CLOUDS WILL REDEVELOP ACROSS
NORTHEAST PLAINS. WILL MENTION SOME FOG AFTER MIDNIGHT.  ON THURSDAY
MODELS TAKE THE UPPER LOW INTO NORTHERN WYOMING...WITH WRAP AROUND
SOUTHWEST FLOW ACROSS AREA.  CROSS SECTIONS SHOW MID LEVEL MOISTURE
INCREASES AGAIN AFTER 18Z.  MID LEVEL LAPSE RATES OF 8 C/KM ALONG
WITH SOME WEAK QG ASCENT SHOULD BE ENOUGH TO GENERATE AFTERNOON
CONVECTION.  TEMPERATURE AND THICKNESS PROGS AS WELL AS GUIDANCE
SUGGEST HIGHS WILL BE IN THE MID 60S ACROSS PLAINS.  THIS MAY BE A
BIT OVERDONE DUE TO CLOUD COVER.  CURRENT TEMPERATURE GRIDS ARE
LOWER...WHICH LOOKS MORE REASONABLE.

.LONG TERM...H5 LOW WILL ACCELERATE INTO NORTH DAKOTA HEADING INTO
THURSDAY.  AN UPPER LVL TRAILING TROF WILL THEN BE DRAGGED THROUGH
THE AREA LATE THURSDAY NIGHT INTO FRIDAY MORNING.  DURING THIS TIME
PERIOD...A BRIEF WINDOW OF LIFT AND MID LVL MSTR WILL EXIST...SO WL
KEEP LOW POPS FOR SOME SHWRS GOING INTO FRIDAY MRNG.  AFTER THIS
PASSES...ATM WL GRADUALLY DRY OUT BY FRIDAY AFTERNOON.  THE
ATMOSPHERE WILL BECOME MUCH MORE STABLE THAN HAS BEEN THE CASE FOR A
WHILE ON THE PLAIN FRIDAY AFTERNOON...SO WL LOWER POPS TO ISOLD
EVERYWHERE.  ALL PCPN SHOULD QUICKLY END FRIDAY NIGHT.  TEMPERATURES
SHOULD BE A LTL WARMER THAN THURSDAY DUE TO MORE AFTN SUNSHINE.

LOOKING AHEAD TO THE WEEKEND AND BEYOND...WEATHER WILL BE MUCH MORE
TRANQUIL DURING THE EXTENDED PERIOD.  A DP UPR TROF WL FORM OVR THE
GULF OF ALASKA INTO THE PAC NW.  UPSTREAM ACRS OUR AREA...A LONG
WAVE RIDGE WL DVLP WHICH WILL LEAD TO DRY WEATHER WITH MUCH WARMER
TEMPERATURES.  PRVS OPERATIONAL GFS MEMBERS WERE POINTING TO A
SUBSTANTIAL HEATWAVE BY MIDWEEK NEXT WK WITH A SHARP RDG SITTING
SQUARELY OVR THE AREA.  MOST OF THE ENSEMBLE MEMBERS ARE NOW INDG
RDG TO BE A BIT WEAKER AND SUPPRESSED...BUT NEVERTHELESS...ABV
NORMAL TEMPS ARE EXPECTED WITH LTL CHC FOR PCPN.  WL KEEP MAX TEMPS
IN THE 80S FOR MONDAY THRU WED NEXT WEEK.

&&

.BOU...NONE.

&&

DL/046

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER CO
1102 AM MDT WED MAY 11 2005

COZ030>051-121200-
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-
1102 AM MDT WED MAY 11 2005

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS ARE EXPECTED TO DEVELOP THIS AFTERNOON
ACROSS THE NORTHEAST PLAINS...AND CONTINUE THROUGH EARLY THIS
EVENING. SHOWERS WILL DIMINISH LATER TONIGHT.

THERE REMAINS A THREAT OF SEVERE THUNDERSTORMS THIS AFTERNOON OVER
THE PALMER DIVIDE...AND EXTENDING NORTHEAST INTO EASTERN PORTIONS OF
ARAPAHOE...ADAMS AND SOUTHERN WASHINGTON COUNTIES AFTER 2 PM.  LARGE
HAIL UP TO 2 INCHES IN DIAMETER ALONG WITH WIND GUSTS TO 60 MPH ARE
POSSIBLE WITH THESE STORMS.  IN ADDITION...FAVORABLE WIND SHEAR IN
THE ATMOSPHERE SUPPORTS THE POTENTIAL FOR TORNADOES.  FURTHER NORTH
AND WEST OVER THE URBAN CORRIDOR...COOLER TEMPERATURES AND CLOUDS
SHOULD KEEP THUNDERSTORMS UNDER SEVERE LIMITS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED AFTER 2 PM THIS AFTERNOON OVER
PORTIONS OF NORTHEAST COLORADO.

DL/046