Alert archive / Iowa / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 262
The Storm Prediction Center issued this severe thunderstorm watch at May 8, 2002, 9:00 PM CDT for 7 counties in Illinois; 21 counties in Iowa; Clark County, Scotland County, Missouri. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- May 8, 2002, 9:00 PM CDT (02:00 UTC)
- Expired
- May 9, 2002, 2:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 30 counties
Benton County, IA, Buchanan County, IA, Cedar County, IA, Clinton County, IA, Delaware County, IA, Des Moines County, IA, Dubuque County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Muscatine County, IA, Scott County, IA, Van Buren County, IA, Washington County, IA, Hancock County, IL, Henderson County, IL, Jo Daviess County, IL, McDonough County, IL, Mercer County, IL, Rock Island County, IL, Warren County, IL, Clark County, MO, Scotland County, MO
The radar
The Quad Cities radar (KDVN), 90 km from the middle of the area, began a volume at 02:00 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
3 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 8, 9:07 PM CDT | Tornado Warning | DVN | Iowa, Keokuk | 68 min |
| May 8, 10:00 PM CDT | Severe Thunderstorm Warning | DVN | Clinton, Jackson | 60 min |
| May 8, 10:06 PM CDT | Severe Thunderstorm Warning | DVN | Johnson | 39 min |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 2.0 hours before the alert went out and 96 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
- 1642 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 951 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 108 m²/s²
- 0-3 km storm-relative helicity
- 227 m²/s²
- Significant tornado parameter
- 1.3
- Supercell composite
- 6.8
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS20 KWNS 090150 SEL2 SPC WW 090143 IAZ000-ILZ000-MOZ000-090700- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 262 STORM PREDICTION CENTER NORMAN OK 843 PM CDT WED MAY 8 2002 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF EASTERN IOWA NORTHWEST ILLINOIS EXTREME NORTHEAST MISSOURI EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 900 PM UNTIL 200 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 55 STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES SOUTH SOUTHWEST OF BURLINGTON IOWA TO 15 MILES WEST NORTHWEST OF DUBUQUE 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. OTHER WATCH INFORMATION... CONTINUE...WW 255...WW 256...WW 257...WW 258...WW 259...WW 260...WW 261... DISCUSSION...LINE OF STRONG/SEVERE STORMS OVER CENTRAL IA WILL CONTINUE TO TRACK EASTWARD TOWARD THE MS RIVER. BOW ECHOES AND ASSOCIATED DAMAGING WINDS APPEAR TO BE THE PRIMARY THREAT. 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 500. MEAN STORM MOTION VECTOR 24035. ...HART 422,0895 401,0902 401,0922 422,0920 WWUS20 KWNS 090150 SEL2 SPC WW 090143 IAZ000-ILZ000-MOZ000-090700- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 262 STORM PREDICTION CENTER NORMAN OK 843 PM CDT WED MAY 8 2002 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF EASTERN IOWA NORTHWEST ILLINOIS EXTREME NORTHEAST MISSOURI EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 900 PM UNTIL 200 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 55 STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES SOUTH SOUTHWEST OF BURLINGTON IOWA TO 15 MILES WEST NORTHWEST OF DUBUQUE 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. OTHER WATCH INFORMATION... CONTINUE...WW 255...WW 256...WW 257...WW 258...WW 259...WW 260...WW 261... DISCUSSION...LINE OF STRONG/SEVERE STORMS OVER CENTRAL IA WILL CONTINUE TO TRACK EASTWARD TOWARD THE MS RIVER. BOW ECHOES AND ASSOCIATED DAMAGING WINDS APPEAR TO BE THE PRIMARY THREAT. 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 500. MEAN STORM MOTION VECTOR 24035. ...HART 422,0895 401,0902 401,0922 422,0920
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 8, 8:30 PM CDT | Severe Thunderstorm Watch | SPC | Adams, Brown, Calhoun, Cass, Greene, Jersey and 6 more | 6 hr |
| May 8, 11:30 PM CDT | Severe Thunderstorm Watch | SPC | Champaign, DeWitt, Douglas, Edgar, Ford, Iroquois and 12 more | 5 hr |
| May 9, 2:30 AM CDT | Severe Thunderstorm Watch | SPC | Champaign, Clark, Clay, Coles, Crawford, Cumberland and 9 more | 6 hr |
| May 8, 8:00 PM CDT | Severe Thunderstorm Watch | SPC | Barton, Bates, Benton, Camden, Cedar, Christian and 11 more | 6 hr |
Nearby
Severe Thunderstorm Watches in Iowa, 2002Severe Thunderstorm Watches in Illinois, 2002Severe Thunderstorm Watches in Missouri, 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.