Alert archive / Nebraska / Severe Thunderstorm Warnings in 2004

Severe Thunderstorm Warning 53, NWS North Platte, NE

May 21, 2004Grant County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at May 21, 2004, 9:05 PM MDT for Grant County, Nebraska. It was in force for 40 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: May 21, 2004, 9:05 PM MDT (03:05 UTC)
Expired: May 21, 2004, 9:45 PM MDT
In force: 40 min
Issued by: NWS North Platte, NE
Area: Counties, with a storm outline in the text

County Grant County, NE

The radar

The North Platte radar (KLNX), 100 km from the middle of the area, began a volume at 03:05 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 00:00Z, 3.1 hours before the alert went out and 134 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: 2197 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 1985 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 99 m²/s²
0-3 km storm-relative helicity: 266 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 19.7

Open this sounding in Storm Lab

The text

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

317 
WUUS53 KLBF 220305
SVRLBF
NEC075-220345-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
905 PM MDT FRI MAY 21 2004

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  GRANT COUNTY IN WEST CENTRAL NEBRASKA

* UNTIL 945 PM MDT

* AT 900 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL.  THIS
  STORM WAS LOCATED 7 MILES SOUTH OF ASHBY...OR ABOUT 27 MILES
  NORTHWEST OF ARTHUR...AND MOVING NORTHEAST AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  HYANNIS AROUND 910 PM MDT
  WHITMAN AROUND 930 PM MDT

LAT...LON 4206 10200 4175 10199 4178 10146 4208 10148

$$

CAB

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 21, 1:32 PM MDT, 7 hours 33 minutes earlier.

Area forecast discussion, May 21, 1:32 PM MDT, 7 hours 33 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
232 PM CDT FRI MAY 21 2004

...FORECAST FOCUS ON CONVECTION IN NEAR TERM...

.DISCUSSION...
WITH H5 FLOW PATTERN MORE AMPLIFIED TO THE SOUTHWEST...SFC LOW
CENTER DEEPENING NEAR GLD KS AS FCST BY BOTH THE ETA AND GFS. WARM
FRONT HAS STALLED FROM NEAR GLD TO NORTH OF BBW AND OFK AND IS
EVIDENT BY SOME WEAK CLOUD CONVERGENCE. ALSO SOME TOWERING CU AND
ISOLATED STORMS IN THE WRN PNHDLE. IN AREA OF HIGHER DWPTS ADVECTED
NWWRD...CONSIDERABLE STRATOCU HAS FORMED. AS DEEPER MIXING OCCURS
THIS SHOULD BECOME MORE SCATTERED. WEAK H7 WAVE IN FLOW SHOULD BE
ENOUGH TO GENERATE ISOLATED TO WIDELY SCATTERED CONVECTION ACROSS
THE SWRN HALF OF FA. AREA OF SEVER CONCERN WITH BE FROM SERN CUSTER
COUNTY INTO CENTRAL CHERRY COUNTY...PARTICULARLY IN AN AXIS JUST
NORTH OF WARM FRONT FROM NEAR ARNOLD TO ONL WHERE DWPTS MAY POOL IN
THE LOWER/MID 60S. NOT ONLY WILL LG HAIL AND DMG WNDS BE A THREAT
BUT AN ISOLATED TORNADO WILL ALSO BE POSSIBLE THIS EVENING. ENTIRE
AREA OF CONVECTION SHOULD EXIT SWRN HALF OF FA BY MIDNIGHT AND EXIT
ENTIRE FA LATE TONIGHT.

SATURDAY...SFC LOW/FRONT SETTLES FURTHER SOUTHEAST WITH FA IN MAINLY
NE WINDS. A STRONG MID LEVEL TROUGH WILL MOVE THROUGH THE FA WITH
INCREASING CHC OF CONVECTION. SEVERE WEATHER AGAIN A THREAT WITH
POTENTIAL FOR STRONGER UPDRAFTS AND BETTER COVERAGE OF CONVECTION BY
LATE AFTN EARLY EVENING. THIS WILL BE SUPPORTED BY COUPLED UPPER JET
STRUCTURE AND FOCUSED UPPER LEVEL DIVERGENCE. TEMPERATURES WILL BE
COOLER IN THE LOWER/MID 70S.

SATURDAY NIGHT...DEVELOPING CONVECTIONS SHOULD MOVE INTO THE
NORTHEAST FA BEFORE EXITING LATE. SUBSIDENCE WILL SET IN TO THE
WEST.

H5 FLOW BECOMES ZONAL SUNDAY WITH HEIGHT RISES. WILL KEEP SLIGHT CHC
ACROSS THE NORTH CENTRAL INVOF SURFACE LOW WITH COLD FRONT SWEEPING
THROUGH LATE.

COOLER AIR BEHIND A COLD FRONT MONDAY WITH A SLIGHT CH FOR SHOWER OR
TS IN THE AFTERNOON AND NIGHT.

.EXTENDED DISCUSSION...
CHC OF SHOWERS TUESDAY/TUESDAY NIGHT AHEAD OF H5 TROUGH. STORM TRACK
SHOULD REMAIN TO OUR NORTH WED/THU BEFORE NEXT CHC ARRIVES FRI/FRI
NIGHT. SEASONABLE TEMPS IN THE 70S.

&&

.LBF...WATCHES/WARNINGS/ADVISORIES...NONE.

&&

ROBERG

Hazardous weather outlook, May 21, 2:33 PM MDT, 6 hours 32 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORTH PLATTE NE
333 PM CDT FRI MAY 21 2004

NEZ004>010-022>029-035>038-056>059-069>071-094-221100-
ARTHUR-BLAINE-BOYD-BROWN-CHASE-CUSTER-DEUEL-EASTERN CHERRY-FRONTIER-
GARDEN-GARFIELD-GRANT-HAYES-HOLT-HOOKER-KEITH-KEYA PAHA-LINCOLN-
LOGAN-LOUP-MCPHERSON-PERKINS-ROCK-SHERIDAN-THOMAS-WESTERN CHERRY-
WHEELER-
INCLUDING THE CITIES OF...AINSWORTH...ARNOLD...ARTHUR...BASSETT...
BIG SPRINGS...BREWSTER...BROKEN BOW...BURWELL...CHAPPELL...CURTIS...
GORDON...GRANT...HAY SPRINGS...HAYES CENTER...IMPERIAL...MULLEN...
NORTH PLATTE...ONEILL...OGALLALA...OSHKOSH...RUSHVILLE...SPENCER...
SPRINGVIEW...STAPLETON...TAYLOR...THEDFORD...TRYON AND VALENTINE
333 PM CDT FRI MAY 21 2004

...SEVERE THUNDERSTORM WATCH FOR THE EASTERN PANHANDLE INTO PORTIONS
OF WEST CENTRAL NEBRASKA...

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

.DAY ONE...TONIGHT

SEVERE THUNDERSTORM DEVELOPMENT WILL BE POSSIBLE ACROSS A MAJORITY OF
THE OUTLOOK AREA LATE THIS EVENING. THE AREA OF GREATEST RISK WILL BE
EAST OF LINE EXTENDING FROM OCONTO IN CUSTER COUNTY...TO THEDFORD IN
THOMAS COUNTY...TO CODY IN CHERRY COUNTY. A WARM FRONT EXTENDING
ACROSS SOUTHWEST INTO NORTH CENTRAL NEBRASKA...WILL BE THE FOCUS FOR
SCATTERED STRONG TO SEVERE THUNDERSTORMS CAPABLE OF PRODUCING VERY
LARGE HAIL AND DAMAGING WINDS GUSTS. THIS BOUNDARY WILL ALSO
CONTRIBUTE TO A FEW STORMS CAPABLE OF PRODUCING TORNADOES...AS
NORTHEAST WINDS NORTH OF THE FRONT AND SOUTH WINDS...SOUTH OF
FRONT...CONVERGE OVER NORTHEAST PORTIONS OF THE OUTLOOK AREA.
ISOLATED SEVERE THUNDERSTORM DEVELOPMENT WILL ALSO BE POSSIBLE WEST
OF THE ABOVE LINE ALONG ANOTHER SURFACE BOUNDARY EXTENDING NORTH TO
SOUTH ACROSS THE WESTERN OUTLOOK AREA. LARGE HAIL AND DAMAGING WINDS
GUSTS WILL BE THE MAIN THREATS WITH THESE STORMS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORM DEVELOPMENT SATURDAY
OVER ALL BUT THE EXTREME NORTHERN PORTIONS OF THE OUTLOOK AREA. THE
RISK AREA IS EXPECTED TO BE SOUTH AND WEST OF A LINE FROM ONEILL
THROUGH AINSWORTH TO VALENTINE.

OTHERWISE...THUNDERSTORMS ARE POSSIBLE EACH DAY THROUGH AT LEAST
TUESDAY AS THE FRONT OSCILLATES NORTH AND SOUTH ACROSS NEBRASKA.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED TONIGHT ACROSS THE OUTLOOK
AREA...ESPECIALLY AREAS ALONG AND EAST OF HIGHWAY 83.

13

In the hours before

Special weather statement, May 21, 7:22 PM MDT, 1 hour 43 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
822 PM CDT FRI MAY 21 2004

NEZ005-022-023-056-094-220220-
DEUEL NE-EASTERN CHERRY NE-GARDEN NE-GRANT NE-WESTERN CHERRY NE-
INCLUDING THE CITIES OF...BIG SPRINGS...CHAPPELL...
OSHKOSH AND VALENTINE
822 PM CDT FRI MAY 21 2004

...THE SEVERE THUNDERSTORM WATCH IN EFFECT FOR DEUEL...GARDEN...GRANT
AND CHERRY COUNTIES...WAS ALLOWED TO EXPIRE AT 7 PM MDT...

SHOWERS AND THUNDERSTORMS ARE STILL POSSIBLE ACROSS THE EASTERN
PANHANDLE AND PORTIONS OF NORTHWESTERN NEBRASKA...AT THIS TIME NO
ADDITIONAL SEVERE WEATHER IS ANTICIPATED.

IF SEVERE WEATHER WAS OBSERVED THIS EVENING PLEASE CONTACT LOCAL LAW
ENFORCEMENT AND HAVE THEM PASS THE REPORT TO THE NATIONAL WEATHER
SERVICE IN NORTH PLATTE.

CLB

Local storm report, May 21, 7:26 PM MDT, 1 hour 39 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
826 PM CDT FRI MAY 21 2004

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

0825 PM     HAIL             13 SSW JOHNSTOWN        42.40N 100.15W
05/21/2004  1.50 INCH        BROWN              NE   TRAINED SPOTTER

&&

DP

Local storm report, May 21, 7:52 PM MDT, 1 hour 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
852 PM CDT FRI MAY 21 2004

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

0850 PM     TORNADO          20 S AINSWORTH          42.26N 99.86W
05/21/2004                   BROWN              NE   LAW ENFORCEMENT

            TORNADO ON GROUND AT INTERSECTION OF HWY 7 AND ELSMERE RD

&&

DP

Local storm report, May 21, 7:53 PM MDT, 1 hour 12 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
853 PM CDT FRI MAY 21 2004

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

0850 PM     HAIL             20 S AINSWORTH          42.26N 99.86W
05/21/2004  2.75 INCH        BROWN              NE   LAW ENFORCEMENT

&&

DP

Local storm report, May 21, 8:44 PM MDT, 21 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
944 PM CDT FRI MAY 21 2004

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

0941 PM     HAIL             14 ESE ROSE             42.09N 99.28W
05/21/2004  0.75 INCH        ROCK               NE   TRAINED SPOTTER

&&

DP

Local storm report, May 21, 8:59 PM MDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
959 PM CDT FRI MAY 21 2004

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

0943 PM     HAIL             20 N BURWELL            42.07N 99.13W
05/21/2004  3.00 INCH        GARFIELD           NE   LAW ENFORCEMENT

            HAIL 2.5 TO 3 INCHES REPORTED NORTH OF BURWELL

&&

DP

The office that day

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

Issued	Product	Office	Counties	Lasted
May 21, 6:26 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	64 min
May 21, 7:19 PM MDT	Severe Thunderstorm Warning	LBF	Brown	41 min
May 21, 7:27 PM MDT	Tornado Warning	LBF	Brown	33 min
May 21, 7:57 PM MDT	Tornado Warning	LBF	Loup, Rock	48 min
May 21, 8:44 PM MDT	Tornado Warning	LBF	Garfield	46 min
May 21, 8:57 PM MDT	Severe Thunderstorm Warning	LBF	Garden	48 min
May 21, 9:18 PM MDT	Tornado Warning	LBF	Wheeler	42 min
May 21, 9:46 PM MDT	Severe Thunderstorm Warning	LBF	Garden	44 min
May 21, 10:01 PM MDT	Severe Thunderstorm Warning	LBF	Wheeler	29 min
May 21, 10:02 PM MDT	Severe Thunderstorm Warning	LBF	Arthur	43 min
May 22, 12:20 AM MDT	Severe Thunderstorm Warning	LBF	Hooker	55 min
May 22, 1:43 PM MDT	Severe Thunderstorm Warning	LBF	Garden	62 min
May 22, 2:14 PM MDT	Tornado Warning	LBF	Arthur, Grant	46 min
May 22, 2:42 PM MDT	Tornado Warning	LBF	Hooker	63 min
May 22, 2:57 PM MDT	Severe Thunderstorm Warning	LBF	Keith, Perkins	63 min
May 22, 2:58 PM MDT	Severe Thunderstorm Warning	LBF	Hayes	62 min
May 22, 3:10 PM MDT	Severe Thunderstorm Warning	LBF	Arthur, McPherson	65 min
May 22, 3:28 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	62 min
May 22, 3:45 PM MDT	Tornado Warning	LBF	McPherson	45 min
May 22, 3:48 PM MDT	Tornado Warning	LBF	Hooker, Thomas	42 min
May 22, 4:11 PM MDT	Tornado Warning	LBF	Lincoln	64 min
May 22, 4:26 PM MDT	Tornado Warning	LBF	Logan	49 min
May 22, 4:43 PM MDT	Severe Thunderstorm Warning	LBF	Thomas	32 min
May 22, 4:51 PM MDT	Severe Thunderstorm Warning	LBF	Blaine	39 min
May 22, 4:55 PM MDT	Severe Thunderstorm Warning	LBF	Chase, Hayes	65 min
May 22, 4:59 PM MDT	Severe Thunderstorm Warning	LBF	Custer	61 min
May 22, 5:16 PM MDT	Tornado Warning	LBF	Logan	29 min
May 22, 5:18 PM MDT	Severe Thunderstorm Warning	LBF	Lincoln	57 min
May 22, 5:24 PM MDT	Tornado Warning	LBF	Custer	51 min
May 22, 5:30 PM MDT	Severe Thunderstorm Warning	LBF	Blaine	30 min
May 22, 5:54 PM MDT	Severe Thunderstorm Warning	LBF	Frontier	36 min
May 22, 5:56 PM MDT	Severe Thunderstorm Warning	LBF	Loup	34 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2004 Every severe thunderstorm 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; radar from the NEXRAD Level II archive.