Alert archive / Missouri / Tornado Watches in 2002

Tornado Watch 284

May 11, 20025 counties in Iowa; 8 counties in Missouri

The Storm Prediction Center issued this tornado watch at May 11, 2002, 7:00 PM CDT for 5 counties in Iowa; 8 counties in Missouri. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 11, 2002, 7:00 PM CDT (00:00 UTC)
Expired
May 12, 2002, 12:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Decatur County, IA, Page County, IA, Ringgold County, IA, Taylor County, IA, Wayne County, IA, Atchison County, MO, Gentry County, MO, Grundy County, MO, Harrison County, MO, Holt County, MO, Mercer County, MO, Nodaway County, MO, Worth County, MO

The radar

The Des Moines radar (KDMX), 170 km from the middle of the area, began a volume at 00:05 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.

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 0.0 hours before the alert went out and 174 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, Topeka, KS at 00:00Z on 2002-05-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2385 joules per kilogram.LCLLFCEL10008507005003002001001 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, Topeka, KS at 00:00Z on 2002-05-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 244 square meters per square second.19395878Sfc1 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
2385 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
742 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
244 m²/s²
0-3 km storm-relative helicity
217 m²/s²
Significant tornado parameter
3.4
Supercell composite
11.2

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 12, 12:30 AM CDTSevere Thunderstorm WatchSPCBarton, Bates, Henry, Jasper, St. Clair, Vernon6 hr
May 12, 1:15 PM CDTSevere Thunderstorm WatchSPCBarry, Barton, Camden, Cedar, Christian, Dade and 17 more6 hr
May 12, 2:45 PM CDTSevere Thunderstorm WatchSPCFranklin, Gasconade, Jefferson, Lincoln, Montgomery, Pike and 4 more5 hr
May 12, 6:15 PM CDTSevere Thunderstorm WatchSPCBollinger, Cape Girardeau, Franklin, Iron, Jefferson, Madison and 5 more5 hr

Nearby

Tornado Watches in Missouri, 2002Tornado Watches in Iowa, 2002Every tornado 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.