Alert archive / Wyoming / Flash Flood Warnings in 2004
Flash Flood Warning 9, NWS Riverton, WY
NWS Riverton, WY issued this flash flood warning at Jul 18, 2004, 3:34 PM MDT for Park County, Wyoming. It was in force for 116 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jul 18, 2004, 3:34 PM MDT (21:34 UTC)
- Expired
- Jul 18, 2004, 5:30 PM MDT
- In force
- 116 min
- Issued by
- NWS Riverton, WY
- Area
- Counties, with a storm outline in the text
County Park County, WY
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this flash flood warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Riverton, WY (KRIW), launched 12:00Z, 9.6 hours before the alert went out and 249 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3179 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 12 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS55 KRIW 182137 FFWRIW MTC113-WYC029-182330- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE RIVERTON WY 334 PM MDT SUN JUL 18 2004 THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTH CENTRAL PARK COUNTY IN NORTHWEST WYOMING EXTREME NORTHEASTERN YELLOWSTONE NATIONAL PK. COUNTY IN SOUTH CENTRAL MONTANA * UNTIL 530 PM MDT * AT 322 PM MDT...THE PUBLIC REPORTED FLASH FLOODING FROM A THUNDERSTORM OVER LAMAR VALLEY...OR ABOUT 10 MILES SOUTHWEST OF NORTHEAST ENTRANCE...MOVING NORTH AT 10 MPH. * THE THUNDERSTORM PRODUCING FLASH FLOODING WILL BE NEAR... 4 MILES WEST OF ICE BOX CANYON BY 355 PM MDT 4 MILES WEST OF NORTHEAST ENTRANCE BY 420 PM MDT RAINFALL ESTIMATES OF 1 TO 2 INCHES HAVE FALLEN IN THE WARNED AREA OVER THE PAST 45 MINUTES. AN ADDITIONAL 1 INCH OF RAIN IS STILL POSSIBLE ACROSS THE LAMAR VALLEY THROUGH 530 PM. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNED AREA...MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. IN HILLY TERRAIN THERE ARE HUNDREDS OF LOW WATER CROSSINGS WHICH ARE POTENTIALLY DANGEROUS IN HEAVY RAIN. DO NOT ATTEMPT TO TRAVEL ACROSS FLOODED ROADS. FIND ALTERNATE ROUTES. IT ONLY TAKES A FEW INCHES OF SWIFTLY FLOWING WATER TO CARRY VEHICLES AWAY. REPORT FLOODING TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4482 11028 4480 11020 4501 11001 4502 11030 $$ HAHN
2 follow-up statements
000 WGUS75 KRIW 182241 FFSRIW MTC113-WYC029-182330- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 434 PM MDT SUN JUL 18 2004 ...A FLASH FLOOD WARNING CONTINUES FOR NORTH CENTRAL PARK COUNTY AND NORTHEASTERN YELLOWSTONE NATIONAL PARK UNTIL 530 PM MDT... AT 425 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE THUNDERSTORMS PRODUCING FLASH FLOODING. THE STORMS WERE REDEVELOPING ACROSS THE NORTHEAST PART OF YELLOWSTONE NATIONAL PARK...FROM TOWER JUNCTION TO THE LAMAR VALLEY RANGER STATION. THE STORMS WERE MOVING NORTH AT 10 MPH. TOTAL RAINFALL AMOUNTS HAVE BEEN 2 TO 2.5 INCHES IN THE PAST 1 1/2 HOURS. ADDITIONAL RAINFALL AMOUNTS OF 1/2 TO 1 INCH WILL BE POSSIBLE THROUGH 530 PM. A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND. REPORT FLOODING TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4481 11056 4479 11013 4501 11001 4502 11047 $$ CUNNINGHAM
000 WGUS75 KRIW 182324 FFSRIW MTC113-WYC029-182345- FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE RIVERTON WY 523 PM MDT SUN JUL 18 2004 ...THE FLASH FLOOD WARNING FOR NORTH CENTRAL PARK COUNTY AND EXTREME NORTHEASTERN YELLOWSTONE NATIONAL PARK IS CANCELLED... THE FLOODING HAS SUBSIDED IN THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED. REPORT FLOODING TO THE NATIONAL WEATHER SERVICE OFFICE IN RIVERTON AT 1-800-211-1448. LAT...LON 4482 11028 4480 11020 4501 11001 4502 11030 $$ CUNNINGHAM
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Riverton, WY wrote its last area forecast discussion before this flash flood warning went out at Jul 18, 2:02 PM MDT, 1 hour 32 minutes earlier.
Area forecast discussion, Jul 18, 2:02 PM MDT, 1 hour 32 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RIVERTON WY 202 PM MDT SUN JUL 18 2004 .TONIGHT THROUGH WEDNESDAY... WV IMAGERY INDICATING UPPER LEVEL RIDGE AXIS OVER THE SOUTHERN AND CENTRAL ROCKIES. MONSOON MOISTURE PLUME ON BACK SIDE OF RIDGE FORM THE SOUTHWEST US ON NORTH ACROSS THE GREAT BASIN...WITH SHORT WAVE MOVING NORTH INTO SOUTHERN IDAHO. ALSO...SMALLER SCALE WAVE JUST WEST OF YNP...MOVING NORTH. CONVECTION HAS DEVELOPED ACROSS SOUTHEAST IDAHO...NORTHERN UTAH AND WESTERN COLORADO WHERE BEST INSTABILITY AND SOME DYNAMICS ARE LOCATED. ISOLD TSTMS HAVE MADE IT INTO WESTERN WYOMING. GOING WITH SCT POPS ACROSS THE WESTERN 1/3 OF CWFA THIS EVENING DUE TO SOME DYNAMICS AND BEST INSTABILITY...AND ISOLD POPS ELSEWHERE. SHORT WAVE ENERGY ROTATES AROUND UPPER LEVEL RIDGE ON MONDAY ACROSS MONTANA...AND RIDGE FLATTENS TUESDAY AND WEDNESDAY. POPS WILL BE MAINLY ISOLD AND AFTERNOON AND EVENING POPS...WITH SOME SCT POPS ACROSS THE MOUNTAINS FOR MONDAY AND TUESDAY. STORMS WILL MAINLY BE INSTABILITY DRIVEN. WILL BE DRY ACROSS THE NORTH ON WEDNESDAY AS MOISTURE IS PUSHED SOUTH. MAINLY ISOLD AFTERNOON AND EVENING POPS ACROSS THE SOUTH ON WEDNESDAY. .WEDNESDAY NIGHT THROUGH SATURDAY... MONSOON MOISTURE CONTINUES TO WORK ITS WAY NORTH WEDNESDAY THROUGH FRIDAY WITH A SERIES OF WEAK SHORT WAVE LOW PRESSURE TROUGHS ROTATING THROUGH THE WEST AND NORTH SIDES OF THE MAIN UPPER LEVEL HIGH PRESSURE RIDGE. THE SHORT WAVE ENERGY...COMBINED WITH THE MOISTURE AND DAYTIME HEATING SHOULD SUPPORT AFTERNOON AND EVENING CONVECTION. HAVE INCREASED CHANCE OF PRECIPITATION THROUGH FRIDAY EXCEPT IN THE NORTH WHERE MOISTURE WILL BE MORE LIMITED. WITH CLOUD COVER AND PRECIPITATION AROUND EXPECT COOLER DAY TIME HIGHS AND HAVE COOLED HIGHS SLIGHTLY WHILE RAISING OVERNIGHT LOWS SLIGHTLY ALSO... DUE TO INCREASED CLOUD COVER LIMITING RADIATIONAL COOLING. && .RIW WATCHES/WARNINGS/ADVISORIES...NONE. && MC/C.BAKER
Hazardous weather outlook, Jul 18, 5:05 AM MDT, 10 hours 29 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE RIVERTON WY 505 AM MDT SUN JUL 18 2004 WYZ001>020-022>030-191105- ABSAROKA MOUNTAINS-BIGHORN MOUNTAINS SOUTHEAST- BIGHORN MOUNTAINS WEST-CASPER MOUNTAIN-CODY FOOTHILLS- EAST SWEETWATER COUNTY-FLAMING GORGE- GREEN MOUNTAINS AND RATTLESNAKE RANGE-JACKSON HOLE-LANDER FOOTHILLS- NATRONA COUNTY LOWER ELEVATIONS-NORTH BIG HORN BASIN- NORTHEAST JOHNSON COUNTY-OWL CREEK AND BRIDGER MOUNTAINS- ROCK SPRINGS AND GREEN RIVER-SALT RIVER AND WYOMING RANGES- SOUTH LINCOLN COUNTY-SOUTHEAST BIG HORN BASIN- SOUTHEAST JOHNSON COUNTY-SOUTHWEST BIG HORN BASIN-STAR VALLEY- TETON AND GROS VENTRE MOUNTAINS-UPPER GREEN RIVER BASIN- UPPER GREEN RIVER BASIN FOOTHILLS-UPPER WIND RIVER BASIN- WIND RIVER BASIN-WIND RIVER MOUNTAINS EAST-WIND RIVER MOUNTAINS WEST- YELLOWSTONE NATIONAL PARK- 505 AM MDT SUN JUL 18 2004 THIS HAZARDOUS WEATHER OUTLOOK IS FOR WESTERN AND CENTRAL WYOMING. .DAY ONE...TODAY AND TONIGHT SCATTERED AFTERNOON AND EVENING THUNDERSTORMS ARE EXPECTED THROUGHOUT SOUTHWEST WYOMING AND AREAS WEST OF THE CONTINENTAL DIVIDE...WITH ONLY ISOLATED THUNDERSTORM ACTIVITY EAST OF THE CONTINENTAL DIVIDE. THESE STORMS MAY PRODUCE DANGEROUS LIGHTNING...PERIODS OF HEAVY RAIN...HAIL AND BRIEF GUSTY WINDS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. ISOLATED AFTERNOON AND EVENING THUNDERSTORMS WILL DEVELOP OVER WESTERN AND CENTRAL WYOMING MONDAY AND TUESDAY. THESE STORMS MAY PRODUCE DANGEROUS LIGHTNING...PERIODS OF HEAVY RAIN...HAIL...AND BRIEF GUSTY WINDS. THERE WILL BE A SLIGHT CHANCE OF THUNDERSTORMS OVER PARTS OF CENTRAL AND WESTERN WYOMING WEDNESDAY THROUGH FRIDAY. .SPOTTER INFORMATION STATEMENT... SPOTTERS ARE ENCOURAGED TO REPORT HAIL SIZES...WIND GUSTS OVER 60 MPH OR HEAVY RAINFALL. THANKS. CF/C.BAKER
The office that day
Everything else NWS Riverton, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 18, 5:31 PM MDT | Flash Flood Warning | RIW | Lincoln, Teton | 119 min |
Nearby
Flash Flood Warnings in Wyoming, 2004Flash Flood Warnings in Montana, 2004Every flash flood warning in 2004
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive.