Alert archive / Nebraska / Tornado Watches in 2002
Tornado Watch 420
The Storm Prediction Center issued this tornado watch at Jun 12, 2002, 4:15 PM CDT for 30 counties in Iowa; Atchison County, Missouri; 38 counties in Nebraska. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 12, 2002, 4:15 PM CDT (21:15 UTC)
- Expired
- Jun 12, 2002, 9:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 69 counties
Adair County, IA, Adams County, IA, Audubon County, IA, Boone County, IA, Carroll County, IA, Cass County, IA, Clarke County, IA, Crawford County, IA, Dallas County, IA, Decatur County, IA, Fremont County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Lucas County, IA, Madison County, IA, Marion County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Polk County, IA, Pottawattamie County, IA, Ringgold County, IA, Shelby County, IA, Story County, IA, Taylor County, IA, Union County, IA, Warren County, IA, Wayne County, IA, Atchison County, MO, Adams County, NE, Boone County, NE, Buffalo County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Clay County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Fillmore County, NE, Franklin County, NE, Greeley County, NE, Hall County, NE, Hamilton County, NE, Howard County, NE, Johnson County, NE, Kearney County, NE, Lancaster County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Nemaha County, NE, Nuckolls County, NE, Otoe County, NE, Platte County, NE, Polk County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Sherman County, NE, Stanton County, NE, Valley County, NE, Washington County, NE, Webster County, NE, York County, NE
The radar
The Omaha radar (KOAX), 33 km from the middle of the area, began a volume at 21:15 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.
Warnings issued inside it
36 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 4:15 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Madison | 45 min |
| Jun 12, 4:29 PM CDT | Severe Thunderstorm Warning | DMX | Warren | 31 min |
| Jun 12, 4:31 PM CDT | Severe Thunderstorm Warning | OAX | Cass, Lancaster, Saunders | 29 min |
| Jun 12, 4:34 PM CDT | Severe Thunderstorm Warning | GID | Nance | 56 min |
| Jun 12, 4:38 PM CDT | Severe Thunderstorm Warning | OAX | Platte | 37 min |
| Jun 12, 4:53 PM CDT | Tornado Warning | OAX | Butler, Platte | 37 min |
| Jun 12, 4:54 PM CDT | Severe Thunderstorm Warning | GID | Merrick | 66 min |
| Jun 12, 4:58 PM CDT | Severe Thunderstorm Warning | DMX | Polk | 32 min |
| Jun 12, 5:01 PM CDT | Tornado Warning | OAX | Cass | 29 min |
| Jun 12, 5:10 PM CDT | Severe Thunderstorm Warning | GID | Polk | 65 min |
| Jun 12, 5:13 PM CDT | Severe Thunderstorm Warning | DMX | Polk, Warren | 47 min |
| Jun 12, 5:26 PM CDT | Tornado Warning | GID | Polk | 49 min |
| Jun 12, 5:29 PM CDT | Severe Thunderstorm Warning | OAX | Butler | 31 min |
| Jun 12, 5:30 PM CDT | Severe Thunderstorm Warning | OAX | Cass | 30 min |
| Jun 12, 5:40 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Mills | 35 min |
| Jun 12, 5:46 PM CDT | Severe Thunderstorm Warning | GID | York | 59 min |
| Jun 12, 5:50 PM CDT | Flash Flood Warning | DMX | Polk | 6 hr |
| Jun 12, 5:50 PM CDT | Severe Thunderstorm Warning | DMX | Dallas | 40 min |
| Jun 12, 5:53 PM CDT | Severe Thunderstorm Warning | OAX | Dodge, Saunders | 37 min |
| Jun 12, 5:58 PM CDT | Severe Thunderstorm Warning | OAX | Seward | 32 min |
| Jun 12, 6:00 PM CDT | Severe Thunderstorm Warning | OAX | Butler | 30 min |
| Jun 12, 6:14 PM CDT | Severe Thunderstorm Warning | DMX | Polk | 31 min |
| Jun 12, 6:16 PM CDT | Severe Thunderstorm Warning | OAX | Fremont, Page | 29 min |
| Jun 12, 6:17 PM CDT | Tornado Warning | OAX | Seward | 28 min |
| Jun 12, 6:31 PM CDT | Severe Thunderstorm Warning | OAX | Lancaster, Saunders | 29 min |
| Jun 12, 6:35 PM CDT | Flash Flood Warning | DMX | Dallas | 3 hr |
| Jun 12, 6:45 PM CDT | Severe Thunderstorm Warning | OAX | Saline, Seward | 30 min |
| Jun 12, 6:55 PM CDT | Severe Thunderstorm Warning | OAX | Page | 35 min |
| Jun 12, 6:57 PM CDT | Severe Thunderstorm Warning | OAX | Burt, Washington | 33 min |
| Jun 12, 7:43 PM CDT | Severe Thunderstorm Warning | OAX | Colfax, Dodge | 32 min |
| Jun 12, 7:56 PM CDT | Severe Thunderstorm Warning | GID | Buffalo | 64 min |
| Jun 12, 8:03 PM CDT | Severe Thunderstorm Warning | OAX | Saunders | 27 min |
| Jun 12, 8:14 PM CDT | Tornado Warning | GID | Buffalo | 61 min |
| Jun 12, 8:29 PM CDT | Severe Thunderstorm Warning | OAX | Saunders | 31 min |
| Jun 12, 8:34 PM CDT | Severe Thunderstorm Warning | GID | Adams, Kearney | 56 min |
| Jun 12, 8:42 PM CDT | Tornado Warning | GID | Kearney | 48 min |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 9.3 hours before the alert went out and 32 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
- 2034 J/kg
- Mixed-layer CIN
- -29 J/kg
- Mixed-layer LCL
- 700 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- -47 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- -0.5
- Supercell composite
- -2.4
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS20 KWNS 122100 SEL0 SPC WW 122057 IAZ000-NEZ000-130200- URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 420 STORM PREDICTION CENTER NORMAN OK 357 PM CDT WED JUN 12 2002 THE STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF SOUTHERN IOWA SOUTHERN NEBRASKA EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 415 PM UNTIL 900 PM CDT. TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE TORNADO WATCH AREA IS ALONG AND 60 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 15 MILES NORTHWEST OF KEARNEY NEBRASKA TO 30 MILES EAST OF DES MOINES IOWA. 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...THIS TORNADO WATCH REPLACES SEVERE THUNDERSTORM WATCH NUMBER 417. WATCH NUMBER 417 WILL NOT BE IN EFFECT AFTER 415 PM CDT. CONTINUE...WW 418...WW 419... DISCUSSION...STORMS WILL INTENSIFY RAPIDLY ACROSS WW AREA WHERE AIRMASS IS VERY UNSTABLE. WITH APPROACH OF MID/UPPER STRONGER WINDS WITH NRN PLAINS UPPER LOW...SHEAR PROFILES FAVORABLE FOR SUPERCELLS AND ISOLATED TORNADOES. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 3 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM MOTION VECTOR 25030. ...HALES 414,0991 422,0930 403,0930 400,0991
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 12, 12:30 PM CDT | Severe Thunderstorm Watch | SPC | Calhoun, Carroll, Crawford, Harrison, Ida, Mills and 5 more | 6 hr |
| Jun 11, 10:15 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Bates, Benton, Cass, Cedar, Dade and 10 more | 4 hr |
Nearby
Tornado Watches in Nebraska, 2002Tornado Watches in Iowa, 2002Tornado Watches in Missouri, 2002Every tornado watch in 2002
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.