Alert archive / Nebraska / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 133, NWS North Platte, NE

May 5, 2007Keya Paha County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at May 5, 2007, 6:37 PM CDT for Keya Paha County, Nebraska. It was in force for 14 min. 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: May 5, 2007, 6:37 PM CDT (23:37 UTC)
Expired: May 5, 2007, 6:51 PM CDT
In force: 14 min
Issued by: NWS North Platte, NE
Area: Counties, with a storm outline in the text

County Keya Paha County, NE

The radar

The North Platte radar (KLNX), 126 km from the middle of the area, began a volume at 23:38 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
May 5, 6:53 PM CDT	HAIL 0.88	13 Ne Springview, NE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 5, 4:33 PM CDT	Tornado Watch PDS	SPC	6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.6 hours before the alert went out and 207 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 175 J/kg
Mixed-layer CIN: -216 J/kg
Mixed-layer LCL: 820 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 199 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS53 KLBF 052337
SVRLBF
NEC103-060000-
/O.NEW.KLBF.SV.W.0133.070505T2337Z-070506T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
637 PM CDT SAT MAY 5 2007

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EASTERN KEYA PAHA COUNTY IN NORTH CENTRAL NEBRASKA...

* UNTIL 700 PM CDT

* AT 633 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING NICKEL SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES
  SOUTH OF BURTON...OR ABOUT 9 MILES EAST OF SPRINGVIEW...AND MOVING
  NORTH AT 60 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  HIGHWAY 183 MILE MARKER 220

A TORNADO WATCH REMAINS IN EFFECT FOR THE WARNED AREA. IF A TORNADO
IS SPOTTED... ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

LAT...LON 4275 9971 4274 9947 4296 9929 4298 9983

$$

SPRINGER

1 follow-up statement

000 
WWUS53 KLBF 052351
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
650 PM CDT SAT MAY 5 2007

NEC103-060000-
/O.CAN.KLBF.SV.W.0133.000000T0000Z-070506T0000Z/
KEYA PAHA NE-
650 PM CDT SAT MAY 5 2007

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN KEYA PAHA COUNTY IS
CANCELLED...
THE STORM THAT PROMPTED THE WARNING HAD MOVED OUT OF KEYA PAHA 
COUNTY. A TORNADO WATCH CONTINUES UNTIL 10 PM CDT.

LAT...LON 4275 9971 4274 9947 4296 9929 4298 9983

$$

SPRINGER

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 May 5, 3:47 PM CDT, 2 hours 50 minutes earlier.

Area forecast discussion, May 5, 3:47 PM CDT, 2 hours 50 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
347 PM CDT SAT MAY 5 2007

.SYNOPSIS...
SEE THE LATEST SWOMCD FOR TORNADO SYNOPSIS. AS 345 PM CDT...WE HAVE
YET TO REPORT A LONG TRACK TORNADO. BUT CONDITIONS ARE FAVORABLE.

&&

.DISCUSSION...
TONIGHT...WILL CONTINUE FLASH FLOOD WATCH TONIGHT ACROSS PARTS OF WRN
AND NCNTL NEB. TONIGHT FCST RELIES HEAVILY ON THE 12Z NAM12 WHICH AS
BEEN PERFORMING QUITE WELL IN THE SHORT TERM. ANOTHER ROUND OF
NOCTURNAL TSTMS...PERHAPS A MCS IS FCST TO LIFT NORTH NORTHEAST
ACROSS NORTH CENTRAL NEBRASKA. LAST NIGHTS EVENT PRODUCED FLOODING IN
PARTS OF LINCOLN AND CUSTER COUNTIES.

SUNDAY AND SUNDAY NIGHT...THE GFS INDICATES THE INVERTED TROF WILL
BE POSITIONS ACROSS FAR NORTHEASTERN ZONES. FCST QPF USES THE NAM12.
ALL INDICATIONS ARE TSTMS AND FLOODING COULD REDEVELOP SUNDAY
NIGHT. POPS ARE SET TO LIKELY ALONG AND EAST OF HIGHWAY 83.

MONDAY AND MONDAY NIGHT...LOOKS LIKE A BREAK IN THE ACTION. THE GFS
AND ECMWF SHOW A STABLE MESO HIGH BUILDING INTO THE FCST AREA. POPS
ARE SLIGHT OR SILENT.

TUESDAY AND TUESDAY NIGHT...CONTINUED STABLE PATTERN. THE ECMWF
CONTINUES TO SHOW THE REMNANTS OF AN UPPER LEVEL LOW ACROSS THE
SWRN U.S. BUT CONDITIONS ARE ONLY WEAKLY FAVORABLE FOR TSTMS. FCST
CONTINUES A SLIGHT CHC POP.

WEDNESDAY AND WEDNESDAY NIGHT...THE ECMWF INDICATES ENERGY FROM THE
REMNANT UPPER LEVEL LOW WILL LIFT ACROSS THE CENTRAL PLAINS. POPS
ARE SET 20 TO 30 PERCENT. LATER FCSTS CAN RAISE THESE VALUES.

THURSDAY AND THURSDAY NIGHT...THE ECMWF INDICATE A SIGNIFICANT
PORTION OF THE UPPER LEVEL LOW WILL LIFT THROUGH THE CNTL PLAINS.
THE ECMWF IS PREFERRED OVER THE GFS AS IT IS THE SLOWEST SOLN. FCST
CONTINUES THE 20 TO 30 POP.

FRIDAY AND SATURDAY...THE ECMWF SHOWS THE UPPER LEVEL LOW MOVING
VERY SLOWLY EAST THRU THE CNTL PLAINS. CONTINUE SLIGHT CHC POPS.

TEMPS ARE A BLEND OF NAM12 2M...GUIDANCE AND HPC.

&&

.AVIATION...
THUNDERSTORMS OVER WESTERN NEBRASKA AND NORTHEAST COLORADO WILL
CONTINUE PRODUCING MARGINAL CEILINGS...INSTRUMENT VISIBILITY AND
STRONG GUSTY WIND THROUGH ABOUT 06Z. IN THE WAKE OF THE
STORMS...ABUNDANT LOW LEVEL MOISTURE FED BY EAST TO SOUTHEAST WIND
WILL BRING MANY AREAS TO INSTRUMENT CEILINGS IN STRATUS. WITH WIND
STAYING IN THE 5-15 KT RANGE...FOG IS NOT LIKELY AND INSTRUMENT
VISIBILITY IS NOT LIKELY. ON SUNDAY...THUNDERSTORMS ARE AGAIN
POSSIBLE.
&&

.HYDROLOGY...
FLOOD WATCH CONTINUES TONIGHT AND MAY NEED TO BE EITHER EXTENDED OR
REISSUED SUNDAY NIGHT AND ON INTO NEXT WEEK DEPENDING ON LATER FCST
DEVELOPMENTS.

&&

.LBF WATCHES/WARNINGS/ADVISORIES...TORNADO WATCHES 232 AND 233 THIS
AFTN AND EVENING. FLASH FLOOD WATCH TONIGHT NEBRASKA ZONES 005>010-
025>029-037-038-059-070-071.

&&

CDC

Hazardous weather outlook, May 5, 4:35 PM CDT, 2 hours 2 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORTH PLATTE NE
435 PM CDT SAT MAY 5 2007

NEZ004>010-022>029-035>038-056>059-069>071-094-062145-
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-
435 PM CDT SAT MAY 5 2007 /335 PM MDT SAT MAY 5 2007/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF WESTERN AND
NORTH CENTRAL NEBRASKA.

.DAY ONE...TONIGHT.

A VERY UNSTABLE ATMOSPHERE WILL CONTINUE TO BE FAVORABLE TO
PRODUCING INTENSE THUNDERSTORMS TONIGHT.

THERE IS A HIGH RISK FOR TORNADOES ACROSS THE AREA MAINLY EAST OF
A LINE FROM ARNOLD THROUGH VALENTINE.

THIS IS A DANGEROUS SITUATION...STAY TUNED TO THE WEATHER FOR
LATER UPDATES AND WARNINGS.

IN ADDITION...TO THE SEVERE WEATHER THREAT...WIDESPREAD HEAVY
RAINFALL IS POSSIBLE OVER THE NEXT 24 HOURS AND A FLASH FLOOD WATCH
IS IN EFFECT FOR PORTIONS OF THE AREA.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

A SLIGHT RISK OF SEVERE THUNDERSTORMS EXISTS FOR SUNDAY EAST OF A
LINE FROM NORTH PLATTE TO VALENTINE. AN UPPER LEVEL LOW...WILL MOVE EAST OF
THE ROCKIES ON SUNDAY. AS THIS FEATURE APPROACHES THE WESTERN
DAKOTAS AND WESTERN NEBRASKA...THUNDERSTORMS ARE EXPECTED TO
DEVELOP DURING THE AFTERNOON HOURS. AT THIS TIME...LARGE HAIL AND
DAMAGING WINDS ARE THE MAIN SEVERE THREATS. HEAVY RAIN AND FLASH
FLOODING IS POSSIBLE AS WELL.

BEYOND SUNDAY...ORGANIZED THUNDERSTORM DEVELOPMENT IS UNLIKELY. AT
THIS TIME NO SEVERE THUNDERSTORMS ARE EXPECTED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER GROUPS ACROSS WESTERN AND NORTH CENTRAL NEBRASKA...SHOULD
BE PREPARED FOR ACTIVATION THIS EVENING.

&&

THIS PRODUCT IS NOW AVAILABLE...ALONG WITH OTHER WEATHER...
HYDROLOGICAL AND CLIMATOLOGICAL INFORMATION...AT
HTTP://WWW.WEATHER.GOV/NORTHPLATTE

KAR

In the hours before

Local storm report, May 5, 4:08 PM CDT, 2 hours 29 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
408 PM CDT SAT MAY 05 2007

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

0347 PM     HAIL             28 NNE HYANNIS          42.37N 101.55W
05/05/2007  E1.00 INCH       CHERRY             NE   PUBLIC

            NICKEL TO QUARTER HAIL.

&&

HENDERSON

Local storm report, May 5, 4:35 PM CDT, 2 hours 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
435 PM CDT SAT MAY 05 2007

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

0434 PM     HAIL             ELI                     42.94N 101.44W
05/05/2007  E1.00 INCH       CHERRY             NE   PUBLIC

            PUBLIC REPORTED STREET WHITE WITH NICKLE DIME AND THE
            OCCASIONAL QUARTER HAIL AT ELI

&&

JSWEET

Local storm report, May 5, 5:24 PM CDT, 1 hour 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
524 PM CDT SAT MAY 05 2007

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

0523 PM     HAIL             6 NNW ANSELMO           41.70N 99.91W
05/05/2007  E1.00 INCH       CUSTER             NE   PUBLIC

&&

MB

Local storm report, May 5, 5:30 PM CDT, 1 hour 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
530 PM CDT SAT MAY 05 2007

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

0520 PM     HAIL             12 S BREWSTER           41.76N 99.87W
05/05/2007  E0.88 INCH       BLAINE             NE   PUBLIC

&&

MB

Local storm report, May 5, 5:42 PM CDT, 55 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
542 PM CDT SAT MAY 05 2007

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

0455 PM     HAIL             3 WNW CODY              42.95N 101.30W
05/05/2007  E1.25 INCH       CHERRY             NE   PUBLIC

            HAIL ALMOST COVERED THE GROUND

&&

MASEK

Local storm report, May 5, 5:53 PM CDT, 44 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
553 PM CDT SAT MAY 05 2007

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

0550 PM     HAIL             5 W NAPER               42.96N 99.20W
05/05/2007  E2.00 INCH       BOYD               NE   PUBLIC

&&

MB

The office that day

Everything else NWS North Platte, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 4, 7:04 PM CDT	Severe Thunderstorm Warning	LBF	Boyd	22 min
May 4, 11:49 PM CDT	Severe Thunderstorm Warning	LBF	Custer	56 min
May 5, 12:17 AM CDT	Severe Thunderstorm Warning	LBF	Custer	28 min
May 5, 12:29 AM CDT	Severe Thunderstorm Warning	LBF	Wheeler	31 min
May 5, 12:36 AM CDT	Severe Thunderstorm Warning	LBF	Lincoln	54 min
May 5, 12:41 AM CDT	Severe Thunderstorm Warning	LBF	Custer	34 min
May 5, 12:44 AM CDT	Severe Thunderstorm Warning	LBF	Custer, Loup	46 min
May 5, 12:47 AM CDT	Tornado Warning	LBF	Chase	43 min
May 5, 12:59 AM CDT	Severe Thunderstorm Warning	LBF	Garfield, Holt, Wheeler	46 min
May 5, 1:08 AM CDT	Tornado Warning	LBF	Perkins	52 min
May 5, 1:12 AM CDT	Severe Thunderstorm Warning	LBF	Blaine, Custer	48 min
May 5, 1:27 AM CDT	Severe Thunderstorm Warning	LBF	Loup	42 min
May 5, 1:29 AM CDT	Severe Thunderstorm Warning	LBF	Lincoln	61 min
May 5, 1:33 AM CDT	Severe Thunderstorm Warning	LBF	Chase	27 min
May 5, 1:46 AM CDT	Severe Thunderstorm Warning	LBF	Wheeler	28 min
May 5, 1:55 AM CDT	Flash Flood Warning	LBF	Lincoln	95 min
May 5, 1:57 AM CDT	Severe Thunderstorm Warning	LBF	Blaine, Custer	63 min
May 5, 2:01 AM CDT	Severe Thunderstorm Warning	LBF	Keith, Lincoln, Perkins	44 min
May 5, 3:25 AM CDT	Flash Flood Warning	LBF	Lincoln	95 min
May 5, 3:35 AM CDT	Severe Thunderstorm Warning	LBF	Custer	40 min
May 5, 6:02 AM CDT	Flash Flood Warning	LBF	Custer	3 hr
May 5, 8:51 AM CDT	Severe Thunderstorm Warning	LBF	Blaine, Loup	24 min
May 5, 9:00 AM CDT	Flash Flood Warning	LBF	Custer	3 hr
May 5, 9:49 AM CDT	Severe Thunderstorm Warning	LBF	Garden, Grant	56 min
May 5, 10:03 AM CDT	Severe Thunderstorm Warning	LBF	Brown, Cherry	57 min
May 5, 10:16 AM CDT	Severe Thunderstorm Warning	LBF	Sheridan	59 min
May 5, 10:32 AM CDT	Severe Thunderstorm Warning	LBF	Lincoln	58 min
May 5, 10:35 AM CDT	Severe Thunderstorm Warning	LBF	Custer	55 min
May 5, 10:56 AM CDT	Severe Thunderstorm Warning	LBF	Blaine	49 min
May 5, 11:08 AM CDT	Severe Thunderstorm Warning	LBF	Brown	67 min
May 5, 11:15 AM CDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	60 min
May 5, 12:18 PM CDT	Severe Thunderstorm Warning	LBF	Custer, Lincoln	42 min
May 5, 12:24 PM CDT	Tornado Warning	LBF	Custer	51 min
May 5, 12:27 PM CDT	Severe Thunderstorm Warning	LBF	Brown	42 min
May 5, 12:47 PM CDT	Severe Thunderstorm Warning	LBF	Garden	58 min
May 5, 12:58 PM CDT	Severe Thunderstorm Warning	LBF	Keya Paha	30 min
May 5, 1:00 PM CDT	Severe Thunderstorm Warning	LBF	Thomas	30 min
May 5, 1:15 PM CDT	Tornado Warning	LBF	Blaine, Custer	45 min
May 5, 1:41 PM CDT	Severe Thunderstorm Warning	LBF	Garden, Sheridan	64 min
May 5, 1:44 PM CDT	Severe Thunderstorm Warning	LBF	Custer, Lincoln, Logan	61 min
May 5, 1:57 PM CDT	Tornado Warning	LBF	Blaine, Brown	63 min
May 5, 2:16 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Thomas	29 min
May 5, 2:22 PM CDT	Severe Thunderstorm Warning	LBF	Perkins	53 min
May 5, 2:25 PM CDT	Tornado Warning	LBF	Perkins	30 min
May 5, 2:36 PM CDT	Tornado Warning	LBF	Custer	34 min
May 5, 2:44 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	61 min
May 5, 2:45 PM CDT	Tornado Warning	LBF	Blaine, Brown	60 min
May 5, 2:51 PM CDT	Severe Thunderstorm Warning	LBF	Keith	39 min
May 5, 2:59 PM CDT	Tornado Warning	LBF	Brown, Keya Paha	46 min
May 5, 3:13 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Custer	37 min
May 5, 3:13 PM CDT	Tornado Warning	LBF	Keith	18 min
May 5, 3:44 PM CDT	Tornado Warning	LBF	Brown, Keya Paha, Rock	31 min
May 5, 3:46 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	59 min
May 5, 4:10 PM CDT	Tornado Warning	LBF	Keya Paha	26 min
May 5, 4:30 PM CDT	Flash Flood Warning	LBF	Blaine, Brown, Custer, Keya Paha	3 hr
May 5, 4:30 PM CDT	Tornado Warning	LBF	Holt, Loup, Rock	45 min
May 5, 4:43 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	28 min
May 5, 5:09 PM CDT	Severe Thunderstorm Warning	LBF	Blaine, Custer	51 min
May 5, 5:14 PM CDT	Tornado Warning	LBF	Holt, Rock	46 min
May 5, 5:37 PM CDT	Severe Thunderstorm Warning	LBF	Boyd	23 min
May 5, 5:43 PM CDT	Severe Thunderstorm Warning	LBF	Brown, Keya Paha	38 min
May 5, 5:51 PM CDT	Severe Thunderstorm Warning	LBF	Rock	24 min
May 5, 6:36 PM CDT	Severe Thunderstorm Warning	LBF	Brown	24 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2007 Every severe thunderstorm warning in 2007

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.