Alert archive / Iowa / Severe Thunderstorm Watches in 2000
Severe Thunderstorm Watch 573
The Storm Prediction Center issued this severe thunderstorm watch at Jul 11, 2000, 7:30 PM CDT for 29 counties in Iowa; 9 counties in Nebraska; 8 counties in South Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 11, 2000, 7:30 PM CDT (00:30 UTC)
- Expired
- Jul 12, 2000, 1:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 46 counties
Audubon County, IA, Boone County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Dickinson County, IA, Emmet County, IA, Greene County, IA, Guthrie County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Lyon County, IA, Monona County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Webster County, IA, Woodbury County, IA, Burt County, NE, Cedar County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE, Bon Homme County, SD, Clay County, SD, Douglas County, SD, Hutchinson County, SD, Lincoln County, SD, Turner County, SD, Union County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 103 km from the middle of the area, began a volume at 00:32 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
23 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 7:30 PM CDT | Tornado Warning | FSD | Lincoln | 30 min |
| Jul 11, 7:44 PM CDT | Tornado Warning | FSD | Lincoln, Turner | 31 min |
| Jul 11, 7:52 PM CDT | Severe Thunderstorm Warning | FSD | Lyon | 23 min |
| Jul 11, 8:05 PM CDT | Severe Thunderstorm Warning | OAX | Cedar | 40 min |
| Jul 11, 8:06 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Yankton | 54 min |
| Jul 11, 8:18 PM CDT | Severe Thunderstorm Warning | FSD | Union | 27 min |
| Jul 11, 8:35 PM CDT | Severe Thunderstorm Warning | FSD | Dixon | 25 min |
| Jul 11, 8:36 PM CDT | Tornado Warning | FSD | Osceola | 24 min |
| Jul 11, 8:52 PM CDT | Tornado Warning | FSD | Plymouth | 23 min |
| Jul 11, 8:57 PM CDT | Severe Thunderstorm Warning | FSD | Dakota, Dixon | 33 min |
| Jul 11, 9:21 PM CDT | Severe Thunderstorm Warning | OAX | Cedar | 24 min |
| Jul 11, 9:28 PM CDT | Severe Thunderstorm Warning | FSD | Dixon | 32 min |
| Jul 11, 9:40 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 35 min |
| Jul 11, 9:56 PM CDT | Severe Thunderstorm Warning | OAX | Colfax, Cuming | 49 min |
| Jul 11, 9:57 PM CDT | Severe Thunderstorm Warning | FSD | Dakota, Dixon | 33 min |
| Jul 11, 10:03 PM CDT | Severe Thunderstorm Warning | OAX | Thurston | 57 min |
| Jul 11, 10:04 PM CDT | Severe Thunderstorm Warning | FSD | Ida | 26 min |
| Jul 11, 10:17 PM CDT | Severe Thunderstorm Warning | DMX | Sac | 28 min |
| Jul 11, 10:44 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 31 min |
| Jul 11, 10:46 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Sac | 44 min |
| Jul 11, 10:46 PM CDT | Severe Thunderstorm Warning | OAX | Cuming, Dodge | 29 min |
| Jul 11, 11:01 PM CDT | Severe Thunderstorm Warning | DMX | Carroll | 44 min |
| Jul 11, 11:15 PM CDT | Severe Thunderstorm Warning | OAX | Dodge, Douglas, Washington | 45 min |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 0.5 hours before the alert went out and 153 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
- 3053 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 1183 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 36 m²/s²
- 0-3 km storm-relative helicity
- 53 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 5.8
The text
As transmitted, in the capitals the NWS used until 2016.
309 WWUS9 KMKC 120027 SEL3 SEL3 MKC WW 120023 IAZ000-NEZ000-SDZ000-120600- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 573 STORM PREDICTION CENTER NORMAN OK 723 PM CDT TUE JUL 11 2000 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF WESTERN IOWA EASTERN NEBRASKA SOUTHEASTERN SOUTH DAKOTA EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 730 PM UNTIL 100 AM CDT. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 95 STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTHEAST OF YANKTON SOUTH DAKOTA TO 70 MILES WEST OF DES MOINES IOWA. REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE FOR 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 572... DISCUSSION...WRN EXTENT OF MN/SD ACTIVITY IS MOVING SEWD AT 35 KT AND WILL INTERACTING WITH INSTABILITY GRADIENT. SBCAPE 0F 3000 TO 5000 J/KG IS ALONG AN AXIS ACROSS ERN NEB/WRN IA INDICATING THAT ACTIVITY WILL MOVE SEWD ALONG WEAK WRM FRONTAL BOUNDARY. AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM MOTION VECTOR 29035. ...MCCARTHY 432,0944 413,0931 413,0965 432,0983
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 11, 11:00 PM CDT | Severe Thunderstorm Watch | SPC | Adair, Adams, Cass, Clarke, Decatur, Fremont and 10 more | 5 hr |
| Jul 12, 3:15 PM CDT | Severe Thunderstorm Watch | SPC | Banner, Box Butte, Cheyenne, Dawes, Deuel, Garden and 5 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Iowa, 2000Severe Thunderstorm Watches in Nebraska, 2000Severe Thunderstorm Watches in South Dakota, 2000Every severe thunderstorm watch in 2000
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.