Alert archive / Nebraska / Severe Thunderstorm Warnings in 2005
Severe Thunderstorm Warning 407, NWS North Platte, NE
NWS North Platte, NE issued this severe thunderstorm warning at Aug 21, 2005, 5:30 PM CDT for Brown County, Nebraska. It was in force for 25 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
- Aug 21, 2005, 5:30 PM CDT (22:30 UTC)
- Expired
- Aug 21, 2005, 5:55 PM CDT
- In force
- 25 min
- Issued by
- NWS North Platte, NE
- Area
- Counties, with a storm outline in the text
County Brown County, NE
The radar
The North Platte radar (KLNX), 94 km from the middle of the area, began a volume at 22:31 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.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.5 hours before the alert went out and 175 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
- 650 J/kg
- Mixed-layer CIN
- -163 J/kg
- Mixed-layer LCL
- 1701 m above ground
- 0-6 km bulk shear
- 5 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS53 KLBF 212231 SVRLBF NEC017-212330- /O.NEW.KLBF.SV.W.0407.050821T2230Z-050821T2330Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE NORTH PLATTE NE 530 PM CDT SUN AUG 21 2005 THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHEASTERN BROWN COUNTY IN NORTH CENTRAL NEBRASKA * UNTIL 630 PM CDT * AT 521 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL. THIS STORM WAS LOCATED 13 MILES NORTH OF AINSWORTH...OR ABOUT 10 MILES SOUTHWEST OF SPRINGVIEW...AND MOVING SOUTH AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... AINSWORTH BY 610 PM CDT LONG PINE BY 620 PM CDT THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. LAT...LON 4270 9969 4277 10004 4244 9998 4235 9968 $$ CDC
1 follow-up statement
000 WWUS53 KLBF 212255 SVSLBF SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE NORTH PLATTE NE 554 PM CDT SUN AUG 21 2005 NEC017-212304- /O.CAN.KLBF.SV.W.0407.000000T0000Z-050821T2330Z/ BROWN NE- 554 PM CDT SUN AUG 21 2005 ...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BROWN COUNTY IS CANCELLED... THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED WELL BELOW SEVERE LEVELS AND NO LONGER POSES A SEVERE WEATHER THREAT. NO ADDITIONAL SEVERE WEATHER IS EXPECTED AT THIS TIME. IF SEVERE WEATHER WAS OBSERVED...PLEASE CONTACT YOUR LOCAL LAW ENFORCEMENT AGENCY AND HAVE THEM PASS THE REPORT TO THE NATIONAL WEATHER SERVICE OFFICE IN NORTH PLATTE. LAT...LON 4270 9969 4277 10004 4244 9998 4235 9968 $$ CDC
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS North Platte, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 21, 3:00 PM CDT, 2 hours 30 minutes earlier.
Area forecast discussion, Aug 21, 3:00 PM CDT, 2 hours 30 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORTH PLATTE NE 300 PM CDT SUN AUG 21 2005 .DISCUSSION... NEAR TERM (TONIGHT THROUGH WEDNESDAY)...MAIN CHALLENGES IN THE NEAR PERIODS ARE LOW POP CHANCES. SETUP FAIRLY CONDUCIVE TO SCATTERED CONVECTION THIS AFTN AS ABUNDANT LL MOISTURE ALREADY IN PLACE WITH SFC DEW POINTS WELL INTO THE MID TO UPPR 60S. CAP ALREADY NON EXISTENT AS OF 19Z WITH CU POPPING READILY ACROSS THE CWA. UPPR WAVE CONTINUES TO SPIN ACROSS NRN CO THIS AFTN SO UPPER LVL INSTABILITY IN PLACE. EXPECT SVR THREAT TO BE LIMITED THOUGH AND CONFINED TO THE DAYLIGHT HOURS AS SURFACE TO 6 KM SHEAR WEAK THIS AFTN. MAIN THREAT AT THIS JUNCTURE IS FROM HEAVY RAIN. SURFACE FOCAL POINTS FOR CONVECTION HARD TO COME BY AT THIS JUNCTURE AS THE ONLY SFC BOUNDARY NOTED IS ALONG THE NERN ZONES...AND ONGOING CONVECTION MAKING THIS DIFFICULT TO IDENTIFY. HAVE OPTED FOR SCATTERED AND ISOLATED TSRAS THIS EVENING. ON MONDAY...SFC BOUNDARY WILL SLIDE SEWD DURING THE DAY...BECOMING ORIENTED FROM VTN TO BBW. UPPR PATTERN CHANGES LITTLE FOR MONDAY WITH A PESKY LOW LEVEL LOW SPINNING OVER NERN COLORADO. AM EXPECTING ANOTHER ROUND OF WIDE SPREAD SCATTERED CONVECTION ON MONDAY AFTERNOON AND EVENING WITH HEATING SOUTH AND WEST OF THE BOUNDARY. ON TUESDAY AND WEDNESDAY...THE PATTERN WILL TRANSITION TO WRLY AND SWRLY FLOW ALOFT AS THE NEXT STRONG UPPR LOW BEGINS TO TRAVERSE THE NRN TIER OF STATES. THE RESULT WILL BE PERSISTENT LEE SIDE TROFFING ON TUESDAY AND WEDNESDAY...AND AN ABUNDANCE OF SHORTWAVES THROUGH MIDWEEK. HAVE CONTINUED POPS FROM PVS FCST. LONG TERM (THURSDAY THROUGH SUNDAY)...MODELS THIS AM INDICATING A FAIRLY SIGNIFICANT CLOSED LOW TRAVERSING FAR SRN CANADA FROM MIDDAY THURSDAY THROUGH SATURDAY. THE MODELS HAVE BEEN PERSISTENT IN ADVERTISING THIS FEATURE FOR THE PAST COUPLE OF DAYS...HOWEVER TIMING DIFFERENCES ABOUND AND UNCERTAINTIES STILL EXIST ON WHETHER OR NOT THE UPPR LOW IS STRONG ENOUGH TO DRIVE A FRONT THROUGH THE FA LATE IN THE WEEK. THE GFS CONTINUES TO INDICATE ROBUST LOW LEVEL MOISTURE ACROSS THE FA THROUGH THE WEEK. ALSO...AS THE CLOSED LOW PULLS OUT ONTO THE PLAINS...DECENT LEE TROFING WILL DEVELOP AND SHOULD PROVIDE SOME SURFACE FOCUS FOR TSRAS TO DEVELOP. IF PATTERN HOLDS...BEST SVR CHANCES SHOULD BE OVER THE WRN DAKOTAS...IN CLOSER PROXIMITY TO THE BEST JET DYNAMICS. CONTINUED MENTION OF POPS FOR THURSDAY...THURSDAY NIGHT AND EARLY FRIDAY (ERN HALF) UNTIL THE TROF AXIS CLEARS THE FA ON FRIDAY. EXPECT THIS TO BE REFINED FURTHER WITH SUCCESSIVE RUNS AS THE MODELS CONTINUE TO SUFFER FROM TIMING ISSUES. WENT WITH A DRY FCST ON SATURDAY AND SUNDAY AS THE GFS IS ADVERTISING LL WESTERLIES AND DRIER LOW LEVEL AIR. && LBF WATCHES/WARNINGS/ADVISORIES...NONE. && CLB
Hazardous weather outlook, Aug 21, 3:34 PM CDT, 1 hour 56 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE NORTH PLATTE NE 334 PM CDT SUN AUG 21 2005 NEZ004>010-022>029-035>038-056>059-069>071-094-222045- SHERIDAN-EASTERN CHERRY-KEYA PAHA-BOYD-BROWN-ROCK-HOLT-GARDEN- GRANT-HOOKER-THOMAS-BLAINE-LOUP-GARFIELD-WHEELER-ARTHUR-MCPHERSON- LOGAN-CUSTER-DEUEL-KEITH-PERKINS-LINCOLN-CHASE-HAYES-FRONTIER- WESTERN CHERRY- 334 PM CDT SUN AUG 21 2005 /234 PM MDT SUN AUG 21 2005/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WESTERN AND NORTH CENTRAL NEBRASKA. .DAY ONE...TONIGHT. SCATTERED THUNDERSTORMS WILL CONTINUE TO DEVELOP THIS EVENING AS THE ATMOSPHERE THROUGHOUT THE OUTLOOK AREA REMAINS UNSTABLE. STORMS WILL BE SLOW MOVING...THEREFORE LOCALLY HEAVY RAINFALL IN PERSISTENT STORMS IS LIKELY. SMALL HAIL AND GUSTY WINDS WILL ALSO BE POSSIBLE. WITH WEAK WINDS ALOFT...WIDESPREAD SEVERE WEATHER IS NOT EXPECTED. HOWEVER...AREAS IN THE VICINITY OF A SURFACE FRONT...EAST OF A LINE FROM VALENTINE TO COMSTOCK...WILL HAVE THE GREATEST POTENTIAL TO RECEIVE SEVERE WINDS AND HAIL. THUNDERSTORMS ARE EXPECTED TO DIMINISH AFTER MIDNIGHT. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY. THERE ARE CHANCES FOR THUNDERSTORM DEVELOPMENT IN THE OUTLOOK AREA THROUGH FRIDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED. && THIS PRODUCT IS NOW AVAILABLE...ALONG WITH OTHER WEATHER... HYDROLOGICAL AND CLIMATOLOGICAL INFORMATION...AT HTTP://WWW.WEATHER.GOV/NORTHPLATTE (ALL LOWERCASE) JMC
The office that day
Everything else NWS North Platte, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 3:49 PM CDT | Severe Thunderstorm Warning | LBF | Holt, Rock | 41 min |
| Aug 21, 4:45 PM CDT | Severe Thunderstorm Warning | LBF | Keya Paha | 47 min |
| Aug 21, 6:46 PM CDT | Severe Thunderstorm Warning | LBF | Custer | 59 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 2005Every severe thunderstorm warning in 2005
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; radar from the NEXRAD Level II archive.