Alert archive / Iowa / Severe Thunderstorm Watches in 2005
Severe Thunderstorm Watch 521
The Storm Prediction Center issued this severe thunderstorm watch at Jun 24, 2005, 9:25 PM CDT for 43 counties in Iowa; 30 counties in Nebraska; Clay County, Union County, Yankton County, South Dakota. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Jun 24, 2005, 9:25 PM CDT (02:25 UTC)
- Expired
- Jun 25, 2005, 5:00 AM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
All 76 counties
Audubon County, IA, Boone County, IA, Bremer County, IA, Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Carroll County, IA, Cerro Gordo County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Floyd County, IA, Franklin County, IA, Greene County, IA, Grundy County, IA, Guthrie County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Harrison County, IA, Humboldt County, IA, Ida County, IA, Jasper County, IA, Kossuth County, IA, Marshall County, IA, Mitchell County, IA, Monona County, IA, O'Brien County, IA, Palo Alto County, IA, Plymouth County, IA, Pocahontas County, IA, Polk County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Story County, IA, Tama County, IA, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Antelope County, NE, Boone County, NE, Burt County, NE, Butler County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Garfield County, NE, Greeley County, NE, Holt County, NE, Howard County, NE, Knox County, NE, Madison County, NE, Merrick County, NE, Nance County, NE, Pierce County, NE, Platte County, NE, Polk County, NE, Saunders County, NE, Sherman County, NE, Stanton County, NE, Thurston County, NE, Valley County, NE, Washington County, NE, Wayne County, NE, Wheeler County, NE, Clay County, SD, Union County, SD, Yankton County, SD
The radar
The Omaha radar (KOAX), 117 km from the middle of the area, began a volume at 02:27 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
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 9:30 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 46 min |
| Jun 24, 9:40 PM CDT | Severe Thunderstorm Warning | FSD | Buena Vista | 37 min |
| Jun 24, 9:44 PM CDT | Severe Thunderstorm Warning | DMX | Pocahontas | 51 min |
| Jun 24, 9:46 PM CDT | Severe Thunderstorm Warning | OAX | Cuming | 18 min |
| Jun 24, 10:24 PM CDT | Severe Thunderstorm Warning | DMX | Sac | 51 min |
| Jun 24, 10:26 PM CDT | Severe Thunderstorm Warning | FSD | Woodbury | 35 min |
| Jun 24, 10:30 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun | 45 min |
| Jun 24, 11:16 PM CDT | Flash Flood Warning | FSD | Buena Vista | 4 hr |
| Jun 24, 11:44 PM CDT | Flash Flood Warning | FSD | Cherokee | 4 hr |
| Jun 25, 12:17 AM CDT | Severe Thunderstorm Warning | FSD | Union | 29 min |
| Jun 25, 1:06 AM CDT | Flash Flood Warning | DMX | Webster | 6 hr |
| Jun 25, 2:23 AM CDT | Flash Flood Warning | FSD | Plymouth | 2 hr |
| Jun 25, 3:10 AM CDT | Flash Flood Warning | FSD | Buena Vista, Cherokee | 2 hr |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 2.4 hours before the alert went out and 117 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
- 2829 J/kg
- Mixed-layer CIN
- -49 J/kg
- Mixed-layer LCL
- 1743 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 155 m²/s²
- 0-3 km storm-relative helicity
- 310 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 19.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 250223
SEL1
SPC WW 250223
IAZ000-NEZ000-SDZ000-251000-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 521
NWS STORM PREDICTION CENTER NORMAN OK
925 PM CDT FRI JUN 24 2005
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN AND CENTRAL IOWA
NORTHERN AND EASTERN NEBRASKA
SOUTHEAST SOUTH DAKOTA
EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 925 PM UNTIL
500 AM CDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 65
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 65
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 10 MILES NORTH
NORTHEAST OF WATERLOO IOWA TO 5 MILES NORTH NORTHWEST OF BURWELL
NEBRASKA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU1).
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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.
OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 518. WATCH NUMBER 518 WILL NOT BE
IN EFFECT AFTER 925 PM CDT. CONTINUE...WW 517...WW 520...
DISCUSSION...ELEVATED TSTMS EXPECTED TO INCREASE OVER WW AREA
THROUGH EARLY SATURDAY AS LLJ/MOISTURE TRANSPORT STRENGTHEN ATOP
STALLING FRONTAL ZONE. GREATEST SEVERE THREAT SHOULD BE
HAIL...ALTHOUGH SMALL SCALE BOWING SEGMENTS WITH DAMAGING WIND COULD
ALSO DEVELOP GIVEN UNIDIRECTIONAL CLOUD LAYER WIND AND HIGH PWS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 55
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 25025.
...CORFIDI
414,0921 405,0991 424,0991 433,0921SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 24, 8:42 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Allamakee, Audubon, Benton, Black Hawk and 74 more | 33 min |
| Jun 25, 12:04 AM CDT | Mesoscale Discussion | SPC | Audubon, Black Hawk, Boone, Bremer, Buena Vista, Butler and 40 more | 86 min |
| Jun 25, 2:08 AM CDT | Mesoscale Discussion | SPC | Carroll, Crawford, Harrison, Ida, Monona, Sac and 1 more | 67 min |
| Jun 25, 3:23 AM CDT | Mesoscale Discussion | SPC | Boone, Calhoun, Carroll, Crawford, Greene, Grundy and 9 more | 37 min |
| Jun 25, 3:35 PM CDT | Mesoscale Discussion | SPC | Adair, Audubon, Benton, Black Hawk, Boone, Bremer and 29 more | 115 min |
| Jun 25, 6:13 PM CDT | Mesoscale Discussion | SPC | Adair, Adams, Audubon, Buena Vista, Calhoun, Carroll and 26 more | 3 hr |
| Jun 24, 7:32 PM CDT | Mesoscale Discussion | SPC | Arthur, Banner, Box Butte, Chase, Cherry, Cheyenne and 16 more | 88 min |
| Jun 24, 10:10 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Buffalo, Clay, Dawson, Fillmore, Franklin and 11 more | 7 hr |
| Jun 24, 11:08 PM CDT | Mesoscale Discussion | SPC | Arthur, Blaine, Box Butte, Brown, Chase, Cherry and 21 more | 67 min |
| Jun 25, 4:02 PM CDT | Mesoscale Discussion | SPC | Chase, Dundy, Hayes, Hitchcock | 88 min |
| Jun 25, 5:40 PM CDT | Mesoscale Discussion | SPC | Banner, Box Butte, Cheyenne, Dawes, Garden, Kimball and 4 more | 95 min |
| Jun 25, 6:05 PM CDT | Severe Thunderstorm Watch | SPC | Arthur, Banner, Box Butte, Cheyenne, Dawes, Deuel and 9 more | 7 hr |
Nearby
Severe Thunderstorm Watches in Iowa, 2005Severe Thunderstorm Watches in Nebraska, 2005Severe Thunderstorm Watches in South Dakota, 2005Every severe thunderstorm watch in 2005
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.