Alert archive / Nebraska / Tornado Watches in 2013

Tornado Watch 243

May 29, 2013Fremont County, Mills County, Iowa; 10 counties in Kansas; 15 counties in Nebraska

The Storm Prediction Center issued this tornado watch at May 29, 2013, 3:33 PM CDT for Fremont County, Mills County, Iowa; 10 counties in Kansas; 15 counties in Nebraska. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued
May 29, 2013, 3:33 PM CDT (20:33 UTC)
Expired
May 29, 2013, 10:35 PM CDT
In force
7 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt
All 27 counties

Fremont County, IA, Mills County, IA, Clay County, KS, Cloud County, KS, Dickinson County, KS, Geary County, KS, Marshall County, KS, Morris County, KS, Ottawa County, KS, Republic County, KS, Riley County, KS, Washington County, KS, Butler County, NE, Cass County, NE, Colfax County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Platte County, NE, Richardson County, NE, Saline County, NE, Saunders County, NE, Seward County, NE

The radar

The Topeka radar (KTWX), 92 km from the middle of the area, began a volume at 20:34 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 SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

18 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 29, 4:16 PM CDTSevere Thunderstorm WarningTOPClay, Dickinson, Ottawa44 min
May 29, 4:35 PM CDTSevere Thunderstorm WarningOAXJefferson, Saline25 min
May 29, 4:39 PM CDTFlash Flood WarningTOPOttawa4 hr
May 29, 4:46 PM CDTSevere Thunderstorm WarningOAXButler, Saline, Seward44 min
May 29, 4:55 PM CDTSevere Thunderstorm WarningTOPClay, Cloud, Ottawa, Republic, Washington50 min
May 29, 4:57 PM CDTSevere Thunderstorm WarningOAXJefferson, Saline33 min
May 29, 5:25 PM CDTSevere Thunderstorm WarningOAXButler, Colfax, Platte35 min
May 29, 5:39 PM CDTSevere Thunderstorm WarningOAXLancaster, Saline, Seward36 min
May 29, 5:40 PM CDTFlash Flood WarningOAXJefferson, Saline3 hr
May 29, 5:53 PM CDTTornado WarningOAXLancaster, Seward37 min
May 29, 5:59 PM CDTSevere Thunderstorm WarningOAXButler, Colfax46 min
May 29, 6:03 PM CDTTornado Warning Tornado observedOAXButler, Colfax27 min
May 29, 6:22 PM CDTFlash Flood WarningOAXLancaster, Saline, Seward3 hr
May 29, 6:45 PM CDTTornado WarningOAXSaunders30 min
May 29, 7:09 PM CDTFlash Flood WarningOAXLancaster3 hr
May 29, 7:12 PM CDTFlash Flood WarningOAXLancaster, Saunders3 hr
May 29, 8:19 PM CDTFlash Flood WarningOAXFremont, Mills, Montgomery, Page, Pottawattamie5 hr
May 29, 9:11 PM CDTSevere Thunderstorm WarningTOPCoffey, Lyon, Morris, Osage34 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Topeka, KS (KTOP), launched 12:00Z, 8.6 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-pSkew-T log-p diagram, Topeka, KS at 12:00Z on 2013-05-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1201 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 12:00Z on 2013-05-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 276 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1201 J/kg
Mixed-layer CIN
-141 J/kg
Mixed-layer LCL
720 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
276 m²/s²
0-3 km storm-relative helicity
274 m²/s²
Significant tornado parameter
0.0
Supercell composite
9.7

Open this sounding in Storm Lab

The text

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

420 
WWUS20 KWNS 292033
SEL3  
SPC WW 292033
IAZ000-KSZ000-NEZ000-300400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 243
NWS STORM PREDICTION CENTER NORMAN OK
335 PM CDT WED MAY 29 2013

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  FAR SOUTHWEST IOWA
  NORTHEAST KANSAS
  SOUTHEAST NEBRASKA

* EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 335 PM
  UNTIL 1100 PM CDT.

* PRIMARY THREATS INCLUDE...
  SEVERAL TORNADOES POSSIBLE
  SEVERAL LARGE HAIL EVENTS WITH A FEW VERY LARGE HAIL EVENTS TO 2
    INCHES IN DIAMETER POSSIBLE
  SEVERAL DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 65 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES EAST SOUTHEAST OF
SALINA KANSAS TO 20 MILES NORTHEAST OF LINCOLN NEBRASKA.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU3).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 239...WW 240...WW
241...WW 242...

DISCUSSION...TSTM DEVELOPMENT IS ANTICIPATED LATE THIS AFTERNOON
ALONG NWD-MOVING OUTFLOW BOUNDARY OVER SERN NEB WITH ONGOING STORMS
OVER S-CNTRL KS MOVING INTO NERN KS PORTION OF WATCH.  THE AMBIENT
AIR MASS IS MODERATELY UNSTABLE WITH THE STRONGEST SHEAR SITUATED
ALONG THE OUTFLOW BOUNDARY.  SUPERCELLS AND BOWING STRUCTURES APPEAR
PROBABLE WITH A RISK FOR LARGE HAIL...DAMAGING WINDS...AND A COUPLE
TORNADOES.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 24030.


...MEAD

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 28, 9:20 PM CDTMesoscale DiscussionSPCAdams, Appanoose, Clarke, Davis, Decatur, Fremont and 10 more55 min
May 29, 8:54 AM CDTMesoscale DiscussionSPCAdair, Adams, Audubon, Boone, Buena Vista, Calhoun and 33 more2 hr
May 29, 2:39 PM CDTMesoscale DiscussionSPCAllamakee, Benton, Black Hawk, Bremer, Buchanan, Chickasaw and 19 more66 min
May 29, 2:56 PM CDTSevere Thunderstorm WatchSPCAllamakee, Appanoose, Benton, Black Hawk, Bremer, Buchanan and 29 more7 hr
May 29, 5:54 PM CDTMesoscale DiscussionSPCAllamakee, Appanoose, Benton, Black Hawk, Bremer, Buchanan and 32 more66 min
May 29, 6:24 PM CDTTornado WatchSPCAdams, Audubon, Buena Vista, Carroll, Cass, Cherokee and 20 more4 hr
May 28, 7:36 PM CDTMesoscale DiscussionSPCBarber, Clark, Comanche, Edwards, Finney, Ford and 13 more114 min
May 28, 7:52 PM CDTMesoscale DiscussionSPCCheyenne, Decatur, Ellis, Gove, Graham, Greeley and 14 more113 min
May 29, 11:33 AM CDTMesoscale DiscussionSPCBarber, Clark, Comanche2 hr
May 29, 12:22 PM CDTTornado WatchSPCBarber, Barton, Clark, Comanche, Edwards, Ellis and 38 more11 hr
May 29, 12:52 PM CDTMesoscale DiscussionSPCCheyenne, Decatur, Graham, Norton, Phillips, Rawlins and 4 more53 min
May 29, 1:04 PM CDTTornado WatchSPCCheyenne, Decatur, Graham, Jewell, Mitchell, Norton and 8 more9 hr
May 29, 3:00 PM CDTMesoscale DiscussionSPCBarber, Barton, Clark, Comanche, Edwards, Ellis and 32 more60 min
May 29, 3:12 PM CDTMesoscale DiscussionSPCButler, Chase, Clay, Cloud, Coffey, Cowley and 24 more2 hr
May 29, 3:24 PM CDTMesoscale DiscussionSPCDecatur, Graham, Jewell, Mitchell, Norton, Osborne and 6 more66 min
May 29, 6:20 PM CDTMesoscale DiscussionSPCButler, Chase, Chautauqua, Coffey, Cowley, Elk and 4 more85 min
May 29, 12:57 AM CDTSevere Thunderstorm WatchSPCBlaine, Custer, Hooker, Lincoln, Logan, Loup and 2 more3 hr
May 29, 5:18 PM CDTMesoscale DiscussionSPCBurt, Cedar, Colfax, Cuming, Dakota, Dixon and 10 more87 min

Nearby

Tornado Watches in Nebraska, 2013Tornado Watches in Kansas, 2013Tornado Watches in Iowa, 2013Every tornado watch in 2013

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.