Alert archive / Iowa / Tornado Watches in 2003

Tornado Watch 341

May 10, 200320 counties in Illinois; 35 counties in Iowa; Putnam County, Schuyler County, Scotland County, Missouri

The Storm Prediction Center issued this tornado watch at May 10, 2003, 3:50 PM CDT for 20 counties in Illinois; 35 counties in Iowa; Putnam County, Schuyler County, Scotland County, Missouri. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 10, 2003, 3:50 PM CDT (20:50 UTC)
Expired
May 10, 2003, 10:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 58 counties

Appanoose County, IA, Benton County, IA, Cedar County, IA, Clinton County, IA, Davis County, IA, Des Moines County, IA, Grundy County, IA, Hardin County, IA, Henry County, IA, Iowa County, IA, Jackson County, IA, Jasper County, IA, Jefferson County, IA, Johnson County, IA, Jones County, IA, Keokuk County, IA, Lee County, IA, Linn County, IA, Louisa County, IA, Lucas County, IA, Mahaska County, IA, Marion County, IA, Marshall County, IA, Monroe County, IA, Muscatine County, IA, Polk County, IA, Poweshiek County, IA, Scott County, IA, Story County, IA, Tama County, IA, Van Buren County, IA, Wapello County, IA, Warren County, IA, Washington County, IA, Wayne County, IA, Bureau County, IL, Carroll County, IL, Fulton County, IL, Henderson County, IL, Henry County, IL, Jo Daviess County, IL, Knox County, IL, Lee County, IL, Marshall County, IL, McDonough County, IL, Mercer County, IL, Ogle County, IL, Peoria County, IL, Putnam County, IL, Rock Island County, IL, Stark County, IL, Stephenson County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Putnam County, MO, Schuyler County, MO, Scotland County, MO

The radar

The Quad Cities radar (KDVN), 107 km from the middle of the area, began a volume at 20:53 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

43 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
May 10, 4:25 PM CDTSevere Thunderstorm WarningDMXWayne50 min
May 10, 4:42 PM CDTSevere Thunderstorm WarningDMXAppanoose48 min
May 10, 4:45 PM CDTSevere Thunderstorm WarningEAXPutnam60 min
May 10, 4:46 PM CDTTornado WarningDMXAppanoose, Wayne44 min
May 10, 4:48 PM CDTSevere Thunderstorm WarningDMXPoweshiek, Tama27 min
May 10, 4:55 PM CDTTornado WarningEAXPutnam65 min
May 10, 4:57 PM CDTSevere Thunderstorm WarningDVNBenton48 min
May 10, 5:11 PM CDTSevere Thunderstorm WarningDMXMarion, Wapello34 min
May 10, 5:17 PM CDTTornado WarningDMXMarion28 min
May 10, 5:28 PM CDTTornado WarningDVNClark, Scotland32 min
May 10, 5:29 PM CDTTornado WarningDMXAppanoose, Davis46 min
May 10, 5:31 PM CDTSevere Thunderstorm WarningDMXJasper, Poweshiek29 min
May 10, 5:34 PM CDTTornado WarningDVNBenton, Buchanan26 min
May 10, 5:35 PM CDTSevere Thunderstorm WarningDVNIowa, Keokuk, Washington10 min
May 10, 5:43 PM CDTTornado WarningDMXMahaska32 min
May 10, 5:48 PM CDTSevere Thunderstorm WarningDVNIowa, Johnson, Keokuk42 min
May 10, 5:49 PM CDTTornado WarningDMXPoweshiek26 min
May 10, 5:57 PM CDTSevere Thunderstorm WarningDMXTama33 min
May 10, 5:57 PM CDTSevere Thunderstorm WarningDVNDelaware, Linn48 min
May 10, 5:58 PM CDTTornado WarningDMXDavis47 min
May 10, 6:01 PM CDTTornado WarningEAXPutnam29 min
May 10, 6:07 PM CDTTornado WarningDMXWapello38 min
May 10, 6:12 PM CDTTornado WarningDMXAppanoose, Davis33 min
May 10, 6:14 PM CDTTornado WarningDMXPoweshiek31 min
May 10, 6:22 PM CDTTornado WarningDMXTama23 min
May 10, 6:30 PM CDTTornado WarningDVNJefferson30 min
May 10, 6:33 PM CDTTornado WarningDVNLee27 min
May 10, 6:44 PM CDTTornado WarningDMXDavis46 min
May 10, 6:44 PM CDTSevere Thunderstorm WarningDVNDelaware, Linn46 min
May 10, 6:51 PM CDTTornado WarningDVNVan Buren39 min
May 10, 7:29 PM CDTTornado WarningDVNHancock, McDonough46 min
May 10, 7:40 PM CDTTornado WarningDVNHenry35 min
May 10, 7:53 PM CDTTornado WarningILXFulton, Knox52 min
May 10, 8:03 PM CDTTornado WarningDVNLouisa27 min
May 10, 8:06 PM CDTTornado WarningDVNWarren24 min
May 10, 8:29 PM CDTTornado WarningDVNMercer46 min
May 10, 8:45 PM CDTTornado WarningILXFulton, Mason60 min
May 10, 8:46 PM CDTTornado WarningILXKnox, Stark44 min
May 10, 8:54 PM CDTTornado WarningDVNBureau, Henry81 min
May 10, 9:19 PM CDTTornado WarningILXPeoria, Tazewell56 min
May 10, 9:36 PM CDTTornado WarningLOTLee39 min
May 10, 9:45 PM CDTTornado WarningILXMason, Tazewell60 min
May 10, 9:59 PM CDTSevere Thunderstorm WarningILXFulton61 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.8 hours before the alert went out and 114 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.

Skew-T log-pSkew-T log-p diagram, Davenport, at 12:00Z on 2003-05-10Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 12:00Z on 2003-05-10The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 139 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1102 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
139 m²/s²
0-3 km storm-relative helicity
225 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.5

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WWUS20 KWNS 102045
SEL1  
SPC WW 102050
IAZ000-ILZ000-110300-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 341 
NWS STORM PREDICTION CENTER NORMAN OK 
350 PM CDT SAT MAY 10 2003

THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF 

       EASTERN IOWA
       NORTHWEST ILLINOIS

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 350 PM UNTIL
1000 PM CDT.

...THIS IS A PARTICULARLY DANGEROUS SITUATION...

DESTRUCTIVE TORNADOES...LARGE HAIL TO 2 INCHES IN DIAMETER...
THUNDERSTORM WIND GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE
POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 70 STATUTE MILES NORTH AND
SOUTH OF A LINE FROM 55 MILES NORTH NORTHEAST OF PEORIA ILLINOIS
TO 65 MILES WEST NORTHWEST OF OTTUMWA 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...CONTINUE...WW 336...WW 337...WW 338...WW
339...WW 340...


DISCUSSION...SURFACE LOW IS FORECAST TO RAPIDLY DEEPEN AND TRACK
NORTHWARD INTO IA.  RAPID DESTABILIZATION IS FORECAST TO OCCUR OVER
EASTERN IA...WHERE THUNDERSTORM DEVELOPMENT SHOULD OCCUR SOON. 
TORNADIC SUPERCELLS ARE LIKELY...WITH THE POTENTIAL FOR DAMAGING
TORNADOES.


AVIATION...TORNADOES AND 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 24035.


...HART

402,0891 402,0933 422,0933 422,0891

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 9, 7:47 PM CDTMesoscale DiscussionSPCCalhoun, Greene, Morgan, Pike, Scott88 min
May 9, 8:40 PM CDTMesoscale DiscussionSPCBond, Champaign, Christian, Clark, Clinton, Coles and 18 more2 hr
May 9, 10:04 PM CDTMesoscale DiscussionSPCAdams26 min
May 9, 10:40 PM CDTSevere Thunderstorm WatchSPCBrown, Cass, Champaign, DeWitt, Ford, Fulton and 22 more5 hr
May 10, 5:43 AM CDTMesoscale DiscussionSPCAdams, Brown, Calhoun, Cass, Christian, Fulton and 15 more92 min
May 10, 5:50 AM CDTSevere Thunderstorm WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 25 more5 hr
May 10, 8:30 AM CDTTornado WatchSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 9 more6 hr
May 10, 9:25 AM CDTMesoscale DiscussionSPCEdwards, Franklin, Gallatin, Hamilton, Hardin, Jackson and 14 more2 hr
May 10, 10:39 AM CDTMesoscale DiscussionSPCClark, Clay, Coles, Crawford, Cumberland, Douglas and 5 more2 hr
May 10, 10:54 AM CDTMesoscale DiscussionSPCAdams, Alexander, Bond, Brown, Calhoun, Cass and 69 more66 min
May 10, 12:38 PM CDTMesoscale DiscussionSPCClay, Crawford, Jasper, Lawrence, Richland97 min
May 10, 3:17 PM CDTMesoscale DiscussionSPCHancock, Henderson, Mercer, Rock Island58 min
May 10, 4:00 PM CDTTornado WatchSPCFranklin, Jackson, Perry, Randolph, Union5 hr
May 10, 4:48 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 25 more87 min
May 10, 5:40 PM CDTTornado WatchSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 21 more5 hr
May 10, 6:41 PM CDTMesoscale DiscussionSPCAdams, Bond, Brown, Calhoun, Cass, Christian and 14 more64 min
May 10, 5:57 PM CDTMesoscale DiscussionSPCAllamakee, Clayton, Fayette93 min
May 10, 6:15 PM CDTTornado WatchSPCAllamakee, Clayton, Fayette, Winneshiek5 hr
May 9, 11:00 PM CDTSevere Thunderstorm WatchSPCAdair, Barton, Bates, Benton, Caldwell, Carroll and 36 more6 hr
May 10, 1:15 AM CDTSevere Thunderstorm WatchSPCAndrew5 hr
May 10, 1:22 AM CDTMesoscale DiscussionSPCNewton83 min
May 10, 2:28 AM CDTMesoscale DiscussionSPCAndrew, Buchanan92 min
May 10, 3:05 AM CDTTornado WatchSPCBarton, Bates, Benton, Cedar, Dade, Henry and 7 more5 hr
May 10, 3:15 AM CDTSevere Thunderstorm WatchSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 25 more5 hr
May 10, 5:27 AM CDTMesoscale DiscussionSPCBarton, Bates, Benton, Cass, Cedar, Dade and 9 more93 min
May 10, 7:06 AM CDTMesoscale DiscussionSPCAdair, Andrew, Atchison, Buchanan, Caldwell, Carroll and 25 more54 min
May 10, 10:58 AM CDTMesoscale DiscussionSPCAdair, Andrew, Audrain, Barton, Bates, Benton and 42 more2 hr
May 10, 11:35 AM CDTTornado WatchSPCAdair, Audrain, Bates, Benton, Boone, Caldwell and 38 more7 hr
May 10, 11:55 AM CDTTornado WatchSPCBarry, Barton, Camden, Cedar, Christian, Dade and 13 more7 hr
May 10, 1:42 PM CDTMesoscale DiscussionSPCAdair, Audrain, Bates, Benton, Boone, Caldwell and 38 more2 hr
May 10, 1:59 PM CDTMesoscale DiscussionSPCBarry, Barton, Camden, Cedar, Christian, Dade and 12 more2 hr
May 10, 3:30 PM CDTMesoscale DiscussionSPCCrawford, Dent, Douglas, Franklin, Gasconade, Howell and 16 more2 hr

Nearby

Tornado Watches in Iowa, 2003Tornado Watches in Illinois, 2003Tornado Watches in Missouri, 2003Every tornado watch in 2003

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.