Alert archive / Nebraska / Flash Flood Warnings in 2008
Flash Flood Warning 19, NWS Cheyenne, WY
NWS Cheyenne, WY issued this flash flood warning at Aug 4, 2008, 7:42 PM MDT for Cheyenne County, Nebraska. It was in force for 4 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 4, 2008, 7:42 PM MDT (01:42 UTC)
- Expired
- Aug 4, 2008, 11:22 PM MDT
- In force
- 4 hr
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
- Flood severity
- None
County Cheyenne County, NE
The radar
The Cheyenne radar (KCYS), 168 km from the middle of the area, began a volume at 01:42 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 4, 8:48 PM MDT | FLASH FLOOD | 8 E Sidney, NE | TWO AND ONE HALF FEET OF WATER REPORTED ON HWY 30 ONE AND ONE HALF MILES EAST OF COUNTY ROAD 129...OR...8 MILES EAST OF SIDNEY. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this flash flood warning; the first came 66 minutes after it went out.
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
Denver, CO (KDNR), launched 00:00Z, 1.7 hours before the alert went out and 155 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
- 5 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 3660 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- -5 m²/s²
- 0-3 km storm-relative helicity
- 47 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 KCYS 050142 FFWCYS NEC033-050545- /O.NEW.KCYS.FF.W.0019.080805T0142Z-080805T0545Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE CHEYENNE WY 742 PM MDT MON AUG 4 2008 THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A * FLASH FLOOD WARNING FOR... EASTERN CHEYENNE COUNTY IN THE PANHANDLE OF NEBRASKA... * UNTIL 1145 PM MDT * AT 738 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO COLTON... SUNOL AND MILLER AIRSTRIP. LODGEPOLE CREEK AND ITS TRIBUTARIES IN EAST CENTRAL CHEYENNE COUNTY WILL BE MOST AFFECTED BY RAINFALL RATES IN EXCESS OF 2 INCHES PER HOUR. ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE WARNED AREA. 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. MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN. REPORT FLOODING TO THE NATIONAL WEATHER SERVICE OFFICE IN CHEYENNE AT 1-800-269-6220. LAT...LON 4134 10293 4134 10262 4106 10263 4106 10292 $$ HAHN
4 follow-up statements
000 WGUS75 KCYS 050227 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 827 PM MDT MON AUG 4 2008 NEC033-050545- /O.CON.KCYS.FF.W.0019.000000T0000Z-080805T0545Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CHEYENNE NE- 827 PM MDT MON AUG 4 2008 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM MDT FOR EASTERN CHEYENNE COUNTY... AT 823 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A COMPLEX OF THUNDERSTORMS PRODUCING AN ESTIMATED 3 TO 4 INCHES OVER EASTERN CHEYENNE COUNTY. LODGEPOLE CREEK AND ITS TRIBUTARIES IN EAST CENTRAL CHEYENNE COUNTY WILL BE MOST AFFECTED BY THIS RECENT VERY HEAVY RAIN. THIS WARNING INCLUDES INTERSTATE 80 IN NEBRASKA BETWEEN MILE MARKERS 62 AND 76. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. LAT...LON 4134 10293 4134 10262 4106 10263 4106 10292 $$ HAHN
000 WGUS75 KCYS 050254 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 854 PM MDT MON AUG 4 2008 NEC033-050545- /O.CON.KCYS.FF.W.0019.000000T0000Z-080805T0545Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CHEYENNE NE- 854 PM MDT MON AUG 4 2008 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM MDT FOR EASTERN CHEYENNE COUNTY... AT 850 PM MDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED 2 FEET OF WATER ON HIGHWAY 30 ONE A HALF A MILES EAST OF COUNTY ROAD 129...OR 8 MILES EAST OF SIDNEY. EVEN THOUGH THE THUNDERSTORMS THAT PRODUCED THE HEAVY RAIN HAVE MOVED EAST...FLASH FLOODING WILL LIKELY STILL BE OCCURRING ACROSS EASTERN CHEYENNE COUNTY. EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. LAT...LON 4134 10293 4134 10262 4106 10263 4106 10292 $$ HAHN
000 WGUS75 KCYS 050428 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 1028 PM MDT MON AUG 4 2008 NEC033-050545- /O.CON.KCYS.FF.W.0019.000000T0000Z-080805T0545Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CHEYENNE NE- 1028 PM MDT MON AUG 4 2008 ...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 1145 PM MDT FOR EASTERN CHEYENNE COUNTY... AT 1025 PM MDT...LOCAL LAW ENFORCEMENT OFFICIALS REPORTED A WATER WAS STILL RUNNING HIGH IN COW CREEK. OTHER AREAS AFFECTED INCLUDE HIGHWAY 30 BETWEEN COUNTY ROADS 125 AND 135. ADDITIONALLY...COUNTY ROAD 131 WAS IMPACTED NORTH AND SOUTH OF HIGHWAY 30. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. MOVE TO HIGHER GROUND. LAT...LON 4134 10293 4134 10262 4106 10263 4106 10292 $$ HAHN
000 WGUS75 KCYS 050522 FFSCYS FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE CHEYENNE WY 1122 PM MDT MON AUG 4 2008 NEC033-050529- /O.CAN.KCYS.FF.W.0019.000000T0000Z-080805T0545Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CHEYENNE NE- 1122 PM MDT MON AUG 4 2008 ...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR EASTERN CHEYENNE COUNTY... LAW ENFORCEMENT IN CHEYENNE COUNTY HAS REPORTED THAT FLOODING PROBLEMS HAVE DIMINISHED...WITH WATER REPORTED TO NO LONGER BE AFFECTING U.S. HIGHWAY 30 AS OF 1034 PM MDT. THOSE TRAVELING THROUGH EASTERN CHEYENNE COUNTY SHOULD BE PREPARED TO SLOW DOWN IF THEY ENCOUNTER ANY REMAINING AREAS OF PONDING ON AREA ROADWAYS. LAT...LON 4134 10293 4134 10262 4106 10263 4106 10292 $$ CARPENTER
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 Cheyenne, WY wrote its last area forecast discussion before this flash flood warning went out at Aug 4, 2:46 PM MDT, 4 hours 56 minutes earlier.
Area forecast discussion, Aug 4, 2:46 PM MDT, 4 hours 56 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 246 PM MDT MON AUG 4 2008 .SHORT TERM...TONIGHT THRU WED...COOL SURGE HAS MADE IT FURTHER S/SW AND FASTER THAN MODELS WERE SHOWING...WITH BNDRY PUSHING W/SW OVER THE LARAMIE/SEMINOLE/GREEN RANGES LATE THIS AFTN INTO EARLY THIS EVNG. LOW LEVEL MSTR IS GRADUALLY INCREASING IN PARTS OF SE WY... MOIST AIRMASS NEVER REALLY LEFT THE PNHNDL. BETTER DEWPOINTS OF 50 OR MORE LIKELY WILL NOT MAKE IT SWWD INTO THE UPSLOPE PARTS OF THE LARAMIE RANGE IN SE WY UNTIL THIS EVENG...WHICH MAY END UP KEEPING THE SCT TSTMS FROM APPROACHING SEVERE LIMITS...ALTHO ONE OR TWO COULD DRIFT FAR ENOUGH E INTO BETTER MSTR TO KICK OUT SOME HAIL. WATER VAPOR PIXS HINT AT A WEAK HIGH LEVEL FTR MOVG ENE INTO SW WY AND TURNING MORE EWD THIS EVNG...WHICH SHOULD PROVIDE SOME HELP FOR TSTMS IN SE PART OF AREA. LATER TNGT MODELS ARE STILL SHOWING A SWWD EXTENSION OF THE MAIN UPPER TROF IN MT CROSSING THE REGION... ALONG WITH SOME LIFT FROM THE RR ENTRANCE REGION OF THE UPPER JET. BOTTOM LINE IS THAT SHWRS AND SOME TSTMS WILL BE POSSIBLE ALL NIGHT EAST OF THE LARAMIE RANGE INTO THE NEB PNHNDL. AIRMASS SATURATES OVERNIGHT WITH WIDESPREAD LOW CLDS DVLPG LATE TNGT AND LINGERING INTO LATE TUE MRNG. STORMS FOR TUE AFTN/EVENG REMAIN UNCERTAIN GIVEN LACK OF UPPER SUPPORT AND EXPECTED LIMITED HEATING ALONG/E OF MTNS. THE BEST CHCS WILL PROBABLY BE ON THE WRN FRINGES OF THE CLDS OR OVER THE MTNS AND LARAMIE VALLEY. MOISTURE/SHEAR FOR SLIGHT RISK IS THERE TUE AFTN/EVENG EAST OF THE MTNS...BUT THERE MAY NOT BE ENOUGH HEATING TO CREATE MEDIUM-LARGE INSTABILITIES. BETTER DAY ACTUALLY APPEARS TO BE SHAPING UP FOR WED AS WE WILL STILL HAVE THE LOW LEVEL MSTR AND LIKELY A BIT EARLY BREAKUP OF THE MRNG LOW CLDS... PLUS MODELS ARE DRAGGING THE UPPER FTR CURRENTLY OVER SRN AZ UP INTO THE REGION BY WED AFTN/EVENG. IT SHOULD BE COOL ON TUE...MODERATING SOME ON WED. .LONG TERM...WED NIGHT THROUGH MON... ECMWF AND GFS ARE COMING INTO BETTER AGREEMENT REGARDING FEATURES WED NIGHT THROUGH MON. UPPER RIDGING WILL PREVAIL OVER MOST OF THE WESTERN U.S. DURING THE PERIOD WITH SHORTWAVES OCCASIONALLY MOVING THROUGH THE RIDGE AND AROUND THE RIDGE. THE RIDGE WILL FLATTEN AND SHIFT EAST SOMEWHAT SATURDAY IN RESPONSE TO SHORTWAVE ENERGY BEING EJECTED NORTHEASTWARD FROM A TROUGH OVER THE PACIFIC COAST. SOUTHWEST TO WEST FLOW ALOFT WILL DEVELOP SAT AND CONTINUE SUNDAY AS A CUTOFF LOW MOVES EAST OVER SOUTHERN CANADA. MODELS HINT AT THE RIDGE GAINING AMPLITUDE AGAIN MON AS HEIGHTS INCREASE OVER THE GREAT BASIN REGION. SURFACE HIGH PRESSURE TO OUR EAST WILL PRODUCE MOIST LOW LEVEL UPSLOPE FLOW WED NIGHT INTO THU. THIS WILL COMBINE WITH SHORTWAVE ENERGY MOVING THROUGH THE RIDGE TO PRODUCE A CHANCE OF STORMS. TEMPERATURES THU WILL BE APPROXIMATELY NORMAL. UPSLOPE SURFACE FLOW WILL WEAKEN FRI WEST OF THE MOUNTAINS...BUT UPSLOPE CONTINUING EAST OF THE MOUNTAINS WILL RESULT IN A BROAD AREA OF WIND CONVERGENCE. ENOUGH MOISTURE AND DYNAMICS WILL BE PRESENT TO WARRANT A CONTINUED CHANCE OF STORMS FRI WITH TEMPS AROUND NORMAL AGAIN. SAT APPEARS TO BE QUITE SIMILAR TO FRI...WITH A CONVERGENCE ZONE RESULTING IN A CONTINUED CHANCE OF RAIN. SURFACE BASED LEESIDE TROUGHING IS PROGGED FOR SUN BUT ENOUGH MOISTURE WILL EXIST FOR A CHANCE OF LATE AFTERNOON STORMS MAINLY FROM THE MOUNTAINS WESTWARD. MON LOOKS TO BE WARM WITH A CHANCE OF RAIN AS A LOW LEVEL CONVERGENCE ZONE REDEVELOPS OVER THE FORECAST AREA. && .AVIATION... VFR CONDITIONS THRU THIS EVENING...EXCEPT FOR LOCAL MVFR VSBYS WITH ANY STRONG TSTORM IN SE WY AND THE SRN PANHANDLE. MVFR CIGS WITH LOCAL IFR CIGS WILL DEVELOP ALONG AND EAST OF THE LARAMIE RANGE BEHIND THE COLD FRONT LATER TONIGHT AND LINGER INTO LATE TUE MRNG. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. &&
Hazardous weather outlook, Aug 4, 9:17 AM MDT, 10 hours 25 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 917 AM MDT MON AUG 4 2008 NEZ001>003-019>021-054-055-WYZ059-060-064-066>070-051100- SIOUX-DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL-CHEYENNE- CONVERSE-NIOBRARA-NORTH LARAMIE RANGE-LARAMIE RANGE-PLATTE-GOSHEN- CHEYENNE FOOTHILLS-PINE BLUFFS- 917 AM MDT MON AUG 4 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE AND SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT SOME THUNDERSTORMS ARE EXPECTED BY LATE THIS AFTERNOON INTO THIS EVENING ACROSS THE AREA. A FEW OF THE STORMS COULD BECOME STRONG WITH HEAVY RAIN AND SOME HAIL THE MAIN THREAT...MAINLY ACROSS FAR SOUTHEAST WYOMING AS WELL AS THE CENTRAL AND SOUTHERN PARTS OF THE PANHANDLE. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY A CHANCE FOR MAINLY LATE DAY THUNDERSTORMS WILL CONTINUE PRIMARILY TUESDAY THROUGH FRIDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE WYZ061-062-063-065-051100- SOUTHWEST CARBON-NORTH CARBON-LARAMIE VALLEY-SNOWY RANGE- 917 AM MDT MON AUG 4 2008 THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT SOME SHOWERS AND WEAK THUNDERSTORMS ARE POSSIBLE THIS AFTERNOON AND EVENING. GUSTY WINDS TO 50 MPH WILL BE THE MAIN HAZARD. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY A CHANCE FOR MAINLY LATE DAY THUNDERSTORMS EXISTS PRIMARILY WEDNESDAY THROUGH SATURDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 4, 7:24 PM MDT | Severe Thunderstorm Warning | CYS | Cheyenne | 66 min |
| Aug 4, 9:20 PM MDT | Severe Thunderstorm Warning | CYS | Morrill | 41 min |
| Aug 5, 12:11 AM MDT | Severe Thunderstorm Warning | CYS | Sioux | 64 min |
| Aug 5, 1:08 AM MDT | Severe Thunderstorm Warning | CYS | Sioux | 45 min |
| Aug 5, 2:05 AM MDT | Severe Thunderstorm Warning | CYS | Dawes | 40 min |
Nearby
Flash Flood Warnings in Nebraska, 2008Every flash flood warning in 2008
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.