Alert archive / Iowa / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 710
The Storm Prediction Center issued this severe thunderstorm watch at Oct 1, 2002, 3:30 PM CDT for 47 counties in Iowa; 8 counties in Nebraska; Lincoln County, Union County, South Dakota. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Oct 1, 2002, 3:30 PM CDT (20:30 UTC)
- Expired
- Oct 1, 2002, 9:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 57 counties
Adair County, IA, Audubon County, IA, Boone County, IA, Buena Vista County, IA, Calhoun County, IA, Carroll County, IA, Cass County, IA, Cerro Gordo County, IA, Cherokee County, IA, Clay County, IA, Crawford County, IA, Dallas County, IA, Dickinson County, IA, Emmet County, IA, Franklin County, IA, Greene 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, Lyon County, IA, Madison County, IA, Marion County, IA, Marshall 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, Pottawattamie County, IA, Sac County, IA, Shelby County, IA, Sioux County, IA, Story County, IA, Warren County, IA, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Burt County, NE, Cuming County, NE, Dakota County, NE, Dixon County, NE, Dodge County, NE, Douglas County, NE, Thurston County, NE, Washington County, NE, Lincoln County, SD, Union County, SD
The radar
The Des Moines radar (KDMX), 158 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.
Warnings issued inside it
15 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 1, 3:34 PM CDT | Severe Thunderstorm Warning | FSD | O'Brien | 41 min |
| Oct 1, 4:20 PM CDT | Severe Thunderstorm Warning | FSD | Clay | 40 min |
| Oct 1, 4:44 PM CDT | Severe Thunderstorm Warning | DMX | Palo Alto | 46 min |
| Oct 1, 5:20 PM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 40 min |
| Oct 1, 6:00 PM CDT | Severe Thunderstorm Warning | OAX | Douglas | 45 min |
| Oct 1, 6:10 PM CDT | Severe Thunderstorm Warning | OAX | Pottawattamie | 35 min |
| Oct 1, 6:16 PM CDT | Severe Thunderstorm Warning | OAX | Washington | 44 min |
| Oct 1, 6:18 PM CDT | Severe Thunderstorm Warning | OAX | Harrison, Shelby | 42 min |
| Oct 1, 6:45 PM CDT | Tornado Warning | OAX | Harrison | 45 min |
| Oct 1, 6:45 PM CDT | Tornado Warning | OAX | Harrison | 45 min |
| Oct 1, 7:07 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 53 min |
| Oct 1, 7:10 PM CDT | Severe Thunderstorm Warning | OAX | Monona | 50 min |
| Oct 1, 7:16 PM CDT | Severe Thunderstorm Warning | DMX | Carroll | 44 min |
| Oct 1, 8:19 PM CDT | Severe Thunderstorm Warning | DMX | Adair | 26 min |
| Oct 1, 8:44 PM CDT | Severe Thunderstorm Warning | DMX | Madison | 31 min |
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 8.5 hours before the alert went out and 168 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
- 976 J/kg
- Mixed-layer CIN
- -220 J/kg
- Mixed-layer LCL
- 1127 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 111 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS20 KWNS 012027 SEL0 SPC WW 012030 IAZ000-NEZ000-020200- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 710 STORM PREDICTION CENTER NORMAN OK 330 PM CDT TUE OCT 1 2002 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF WESTERN AND CENTRAL IOWA EASTERN NEBRASKA EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 330 PM UNTIL 900 PM CDT. HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 80 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES WEST OF SIOUX CITY IOWA TO 65 MILES SOUTH SOUTHEAST OF MASON CITY 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES. DISCUSSION...CLUSTER OF INTENSE THUNDERSTORMS IS ONGOING OVER NORTHWEST IA...WHILE OTHER STORMS ARE EXPECTED TO DEVELOP IN THE NEXT 1-2 HOURS OVER EASTERN NEB. MODERATELY UNSTABLE AIRMASS...COUPLED WITH 40-50 KNOT 6KM SHEAR VALUES SUGGEST THE POTENTIAL FOR SUPERCELL STORMS PRODUCING LARGE HAIL AND DAMAGING WINDS. AVIATION...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 26035. ...HART 433,0965 432,0925 410,0925 411,0965
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 1, 4:35 PM CDT | Severe Thunderstorm Watch | SPC | Fremont, Mills, Montgomery, Page | 6 hr |
Nearby
Severe Thunderstorm Watches in Iowa, 2002Severe Thunderstorm Watches in Nebraska, 2002Severe Thunderstorm Watches in South Dakota, 2002Every severe thunderstorm 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.