Special Weather Statement, NWS Denver/Boulder, CO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER CO
315 PM MDT MON MAY 30 2011

.SHORT TERM...UPPER TROUGH MOVING OUT OF THE FOOTHILLS THIS
AFTERNOON INTERACTED WITH COOL MOIST AIRMASS OVER I-25 CORRIDOR AND
WELD COUNTY TO PRODUCE A ROUND OF STRONG THUNDERSTORMS WHICH IS
PRESENTLY MOVING INTO LOGAN AND MORGAN COUNTIES.  ENVIRONMENT IS
STRONGLY SHEARED WITH NORTHERLIES AT THE SURFACE AND WEST-SOUTHWEST
FLOW ALOFT.  SOME STORMS HAVE GENERATED SHORT-LIVED FUNNEL CLOUDS
AND POSSIBLY ONE OR TWO TORNADOES.  THUNDERSTORMS WILL CONTINUE
MOVING ACROSS THE NORTHEAST PLAINS THROUGH THE EARLY EVENING.
BEHIND THIS SHORTWAVE...STRONG WESTERLY WINDS HAVE BEGUN MOVING OUT
OF THE MOUNTAINS.  DEW POINTS HAVE BEGUN DROPPING NEAR THE FOOTHILLS
WHICH WILL CONTINUE THROUGH TONIGHT.  WEST WINDS ARE EXPECTED TO
CONINUE INTO THE EVENING AND THEN DECREASE AFTER THE SUN SETS.
UPPER LEVEL RIDGING WILL BE BUILDING OVER THE STATE OVERNIGHT WHICH
SHOULD SUPPRESS ANY MOUNTAIN SHOWER ACTIVITY AND BRING DRY WEATHER
TO THE STATE FOR TUESDAY.  MID-LEVEL WARMING WILL SPREAD OVER THE
STATE TOMORROW.  HIGHS WILL CLIMB TO AROUND 80 DEGREES ACROSS THE
PLAINS AND INTO THE 50S OVER THE HIGHER MOUNTAINS.

.LONG TERM...A MUCH WARMER THAN NORMAL PERIOD WILL COME TO
NORTHEASTERN COLORADO TUESDAY THROUGH NEXT WEEKEND AS A BROAD RIDGE
BUILDS OVER THE SOUTHERN STATES. SOUTHWESTERLY FLOW ALOFT WILL KEEP
WARM ADVECTION OVER THE STATE ALONG WITH SOME SUBTROPICAL MOISTURE
TO ALLOW A SLIGHT CHANCE OF THUNDERSTORMS A FEW DAYS OF THE WEEK.

WEDNESDAY AFTERNOON...A WEAK DISTURBANCE COMBINED WITH A SLIGHT
SURGE OF SUBTROPICAL MOISTURE OVER SOUTHEASTERN COLORADO WILL BRING
A SLIGHT CHANCE OF THUNDERSTORMS MAINLY SOUTH OF I76 AND EAST OF THE
METRO AREA...AS WELL AS OVER THE HIGH COUNTRY SOUTH OF I70. THURSDAY
WILL BE WARM AGAIN BUT WINDY AS A PACIFIC NORTHWEST UPPER TROUGH
PUSHES CLOSER TO BRING STRONGER SOUTHWEST WINDS OVER THE AREA. THERE
WILL BE JUST A SLIGHT CHANCE OF STORMS AND SHOWERS OVER THE FAR
NORTHEASTERN CORNER THURSDAY AFTERNOON AS WELL. THE TROUGH WILL
MOVE EAST OVER THE NORTHERN ROCKIES THURSDAY NIGHT THROUGH FRIDAY
NIGHT WHICH BRINGING SLIGHTLY COOLER TEMPERATURES FRIDAY THROUGH THE
WEEKEND.

MAIN CONCERN CONTINUES TO BE THE UNSEASONABLY WARM TEMPERATURES.
FOR THE MOUNTAINS THIS WILL IMPACT THE SNOWMELT...SEE THE HYDROLOGY
DISCUSSION BELOW.  FOR THE FRONT RANGE FOOTHILLS...SOUTH PARK AND
NORTHEAST PLAINS FIRE WEATHER ISSUES MAY START CROPPING UP AS FUELS
GET DRIER.  MAIN AREA OF CONCERN WILL BE SOUTH PARK...THE SOUTHERN
FRONT RANGE FOOTHILLS AND PALMER DIVIDE AREAS MAINLY ON THURSDAY AND
FRIDAY  NO HIGHLIGHTS AT THIS TIME BUT IT WILL BE SOMETHING TO KEEP
AN EYE ON.
&&

.AVIATION...CONVECTION WILL CLEAR OUT OF DENVER AREA BY 5 PM.  CIGS
WILL THEN REMAIN VFR OVERNIGHT.  GUSTY WEST WINDS SPREADING ACROSS
THE DENVER AREA BY 6 PM WILL CONTINUE WELL INTO THE EVENING BEFORE
CALMING DOWN.  SPEEDS OF 20 TO 30 MPH WILL BE COMMON OVER KDEN.
GUSTS UP TO 45 MPH WILL OCCUR AT KBJC.  LESS WEATHER AND WINDS FOR
TUESDAY.

&&

.HYDROLOGY...MOUNTAIN TEMPERATURES WILL CLIMB ABOVE NORMAL IN THE
MIDDLE OF THE WEEK WITH HIGHS IN THE UPPER 50S AND 60S IN THE
MOUNTAINS...AND MID 70S TO LOWER 80S IN THE MOUNTAIN VALLEYS.
OVERNIGHT LOWS ARE EXPECTED TO REMAIN ABOVE FREEZING IN THE
MOUNTAINS. THIS WILL RESULT IN INCREASING SNOW MELT DURING THE
LATTER HALF OF THE WEEK. LOW LYING AREAS NEAR RIVERS AND CREEKS CAN
EXPECT FLOODING.

&&

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

&&

KDRBY/KRIEDERMAN

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PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE DENVER CO
332 PM MDT MON MAY 30 2011

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

0322 PM     HAIL             18 SE ROGGEN            39.99N 104.13W
05/30/2011  M0.75 INCH       ADAMS              CO   TRAINED SPOTTER

0318 PM     HAIL             15 SE ROGGEN            40.02N 104.17W
05/30/2011  M0.75 INCH       WELD               CO   TRAINED SPOTTER

0315 PM     HAIL             12 SE ROGGEN            40.05N 104.21W
05/30/2011  M0.75 INCH       WELD               CO   TRAINED SPOTTER

0257 PM     HAIL             12 SE KEENESBURG        39.99N 104.36W
05/30/2011  M0.75 INCH       ADAMS              CO   TRAINED SPOTTER

0226 PM     HAIL             KEENESBURG              40.11N 104.52W
05/30/2011  M1.25 INCH       WELD               CO   TRAINED SPOTTER

0219 PM     HAIL             1 ENE KEENESBURG        40.11N 104.50W
05/30/2011  M1.25 INCH       WELD               CO   TRAINED SPOTTER

            BROKEN CAR WINDOWS AND SHREDDED LEAVES

&&

FREDIN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DENVER CO
334 PM MDT MON MAY 30 2011

COZ044-302215-
MORGAN COUNTY CO-
334 PM MDT MON MAY 30 2011

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY FOR

  MORGAN COUNTY

AT 334 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND WIND GUSTS
TO AROUND 50 MPH.  THIS STORM WAS LOCATED 6 MILES WEST OF ADENA
SCHOOL...OR 10 MILES SOUTHWEST OF FORT MORGAN. THIS STORM WAS MOVING
NORTHEAST AT 20 MPH.

LOCATIONS IN THE ADVISORY INCLUDE BUT ARE NOT LIMITED TO WIGGINS...
WELDONA...TWELVE-MILE CORNER...ORCHARD...LOG LANE VILLAGE...JACKSON
RESERVOIR...HOYT...GOODRICH...FORT MORGAN...BRUSH...ANTELOPE
SPRINGS...ADENA SCHOOL AND ADENA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THUNDERSTORMS OCCASIONALLY PRODUCE WEAK...SHORT-LIVED TORNADOES WITH
LITTLE OR NO ADVANCE WARNING. THESE WEAK TORNADOES ARE CAPABLE OF
PRODUCING MINOR DAMAGE SO IF A TORNADO IS OBSERVED MOVE TO A PLACE OF
SAFETY.

&&

LAT...LON 4044 10357 4002 10362 4001 10413 4044 10412
TIME...MOT...LOC 2134Z 180DEG 0KT 4015 10391