Flash Flood Warning 12, NWS Riverton, WY

000 
WGUS75 KRIW 191941
FFSRIW
WYC013-192200-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
140 PM MDT SAT JUL 19 2003

...A FLASH FLOOD WARNING CONTINUES FOR SOUTH CENTRAL FREMONT COUNTY
UNTIL 400 PM MDT...

AT 134 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY
HEAVY RAIN OVER ATLANTIC CITY...OR ABOUT 24 MILES SOUTH OF LANDER. 
THE ASSOCIATED STORM WAS MOVING SOUTH AT 5 MPH. EARLIER THIS STORM 
PRODUCED AN ESTIMATED 2 TO 3 INCHES AROUND ROCK CREEK RESERVOIR. 

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF CREEKS
AND STREAMS...ROADS AND ROADSIDE CULVERTS. THE HEAVY RAINS COULD ALSO
TRIGGER ROCK AND MUDSLIDES IN STEEP TERRAIN.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA EVACUATE TO HIGHER GROUND IMMEDIATELY.
DRY CREEKS AND GENTLY FLOWING STREAMS CAN BECOME RAGING TORRENTS IN A
MATTER OF MINUTES DURING VERY HEAVY RAINFALL. NEVER ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS BY FOOT OR IN A CAR.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT. IT IS
IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR
CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS. CAMPERS SHOULD AVOID
CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
RIVERTON.



LAT...LON 4259 10866 4253 10889 4232 10885 4235 10845
$$

SKRBAC

000 
WGUS75 KRIW 192039
FFSRIW
WYC013-192200-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
235 PM MDT SAT JUL 19 2003

...A FLASH FLOOD WARNING CONTINUES FOR SOUTH CENTRAL FREMONT COUNTY
UNTIL 400 PM MDT...

AT 229 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED VERY
HEAVY RAIN 13 MILES SOUTHEAST OF ATLANTIC CITY...OR ABOUT 32 MILES
SOUTH OF LANDER. THE ASSOCIATED STORM WAS MOVING EAST AT 5 MPH.

EXCESSIVE RUNOFF FROM THIS STORM OVER AND NEAR ROCK CREEK RESERVOIR 
WILL CAUSE FLASH FLOODING OF AREA CREEKS AND STREAMS...ROADS AND 
ROADSIDE CULVERTS. THE HEAVY RAINS COULD ALSO TRIGGER ROCK AND 
MUDSLIDES IN STEEP TERRAIN. EVEN THOUGH THE STORMS HAD WEAKENED... 
ADDITIONAL THUNDERSTORMS WERE FORMING OVER THE WEST SLOPE OF THE 
WIND RIVER MOUNTAINS AND MAY MOVE BACK OVER THE SAME AREAS THAT 
EARLIER RECEIVED VERY HEAVY RAINS.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNED AREA EVACUATE TO HIGHER GROUND IMMEDIATELY.
DRY CREEKS AND GENTLY FLOWING STREAMS CAN BECOME RAGING TORRENTS IN A
MATTER OF MINUTES DURING VERY HEAVY RAINFALL. NEVER ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS BY FOOT OR IN A CAR.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY.
MOVE TO HIGHER GROUND.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
RIVERTON.



LAT...LON 4268 10884 4239 10880 4234 10844 4256 10844
$$

SKRBAC

000 
WGUS75 KRIW 192102
FFSRIW
WYC013-192130-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
259 PM MDT SAT JUL 19 2003

...THE FLASH FLOOD WARNING FOR SOUTH CENTRAL FREMONT COUNTY HAS BEEN
CANCELLED...

AT 259 PM MDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT
THE THUNDERSTORMS THAT PROMPTED THE WARNING HAD WEAKENED...THUS THE 
WARNING HAS BEEN CANCELLED. RUNOFF FROM THESE EARLIER STORMS... 
ESPECIALLY AROUND ROCK CREEK RESERVOIR...WILL LIKELY STILL CAUSE 
AREAS STREAMS AND NORMALLY DRY WASHES TO BE FLOWING QUITE HIGH FOR 
SEVERAL MORE HOURS. TRAVELLERS ALONG THE LOOP ROAD BETWEEN SOUTH 
PASS AND SINKS CANYON SHOULD BE ALERT FOR ADDITIONAL THUNDERSTORMS 
INTO THE EVENING HOURS.



$$
SKRBAC

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE RIVERTON WY
100 PM MDT SAT JUL 19 2003

.TONIGHT THROUGH TUESDAY NIGHT...
UPPER LEVEL HIGH PRESSURE TO REMAIN ACROSS THE SOUTHWEST US THROUGH
FCST PERIOD WITH WEST/NORTHWEST FLOW ACROSS WY. BEST PRECIP CHANCES
APPEAR TO BE LATER THIS AFTERNOON INTO THIS EVENING WITH BEST
DYNAMICS IN PLACE. GOOD UPPER LEVEL DIVERGENCE IN ENTRANCE REGION OF
JET SHOULD AID INSTABILITY IN PLACE. KRIW 88D VERIFYING THIS TREND
WITH TSRA CONTINUING TO INCREASE IN COVERAGE ACROSS HIGHER
ELEVATIONS. SCATTERED POPS STILL LOOK REASONABLE. PWATS STILL NEAR
INCH SO CHANCES FOR LOCALIZED WETTING RAINS POSSIBLE. PRECIP CHANCES
APPEAR TO LOWER INTO EARLY NEXT WEEK. WILL LOWER POPS SUN AND REMOVE
MENTION FOR MON. HEAT REMAINS IN PLACE FOR MOST PART AS UPPER HIGH
HOLDS STRONG AND CAA REMAINS NORTHEAST OF AREA. HAVE RAISED TEMPS A
FEW DEGREES FOR SUN/MON TIME FRAME.   FRIEDERS

.WEDNESDAY THROUGH SATURDAY...UPPER LOW NEAR ALUETIAN CHAIN PROGGED
TO MOVE ACROSS NORTH CENTRAL CANADA WEDNESDAY AND THURSDAY.  THIS
MOVEMENT COINCIDES WITH AN EASTWARD SHIFT OF UPPER HIGH POSITION
FROM SOUTHWEST GREAT BASIN INTO NEW MEXICO.  AIRMASS FAIRLY STABLE
TUESDAY WITH DRIER AIRMASS AND GFS SHOWING -4C H5 ISOTHERM OVER NW
TUESDAY 12Z.   PRESSURE FALLS OVER NORTHERN ROCKIES WEDNESDAY WITH
JET STREAK CROSSING NORTHERN MONTANA TO PULL UP WARMER BUT NOT SO
DRY AIRMASS INTO WYOMING WITH H7 TEMPERATURES BACK IN THE 18-20C
RANGE.  THUS...WEDNESDAY LOOKS TO BE WARMEST DAY WTIH BASIN TEMPS
NEAR THE 100F MARK.  BEST LIFT/INSTABILITY AND MOISTURE PROGGED
ACROSS NW ZONES WHERE WILL ADD SOME LOW POPS WEDNESDAY PM.  FRONT
PROGGED TO MOVE ACROSS MONTANA THURSDAY AND BACK INTO CENTRAL WYOMING
THURSDAY NIGHT.  WITH UPPER HIGH SHIFTING BACK INTO NEW MEXICO...GFS
SHOWS MONSOONAL MOISTURE CREEPING BACK UP INTO SOUTHERN AND CENTRAL
WYOMING THURSDAY AND ONWARD WHILE STRONGER WESTERLIES KEEP NORTH A
BIT DRIER THURSDAY AND FRIDAY.  WILL BASICALLY CONTOUR POPS FROM
SOUTH (SCT) TO NORTH (ISOLD) IN THIS SCENARIO AND MODERATE
TEMPERATURES BACK TO TO NEAR NORMAL.  AEM

.RIW...NONE.

WYZ001>020-022>030-201100-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE RIVERTON WY
955 AM MDT SAT JUL 19 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING.

.DAY ONE...TODAY AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING ACROSS THE WIND RIVER AND BIG HORN BASINS ALONG WITH NATRONA
AND JOHNSON COUNTIES. MONSOONAL MOISTURE MOVING UP FROM THE SOUTH
WILL INTERACT WITH AN UPPER LEVEL JET STREAM TO PRODUCE SCATTERED
AFTERNOON THUNDERSTORMS ACROSS MOST OF WYOMING. THE STRONGEST STORMS
ARE EXPECTED TO FORM OVER THE ABSAROKA RANGE AND EAST SLOPE OF THE
WIND RIVER MOUNTAINS THIS AFTERNOON THEN MOVE EAST INTO THE WIND
RIVER AND BIG HORN BASINS. OTHER STORMS MAY DEVELOP ACROSS JOHNSON
AND NATRONA COUNTIES. THESE STORMS WILL LIKELY CONTINUE WELL INTO
THE EVENING. THE STRONGEST STORMS MAY CONTAIN NICKEL TO QUARTER
SIZED HAIL AND WIND GUSTS OVER 60 MPH. ALSO...SLOW SOUTHEAST MOVEMENT
OF AROUND 15 MPH WILL ALLOW FOR HEAVY RAIN WITH THE STRONGEST
STORMS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING EAST OF
THE CONTINENTAL DIVIDE...MAINLY IN JOHNSON AND NATRONA COUNTIES.