Alert archive / Missouri / Tornado Watches in 2002

Tornado Watch 197

May 1, 20027 counties in Illinois; 21 counties in Missouri

The Storm Prediction Center issued this tornado watch at May 1, 2002, 7:00 PM CDT for 7 counties in Illinois; 21 counties in Missouri. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued
May 1, 2002, 7:00 PM CDT (00:00 UTC)
Expired
May 1, 2002, 11:00 PM CDT
In force
4 hr
Issued by
the Storm Prediction Center
All 28 counties

Bond County, IL, Clinton County, IL, Madison County, IL, Monroe County, IL, Randolph County, IL, Saint Clair County, IL, Washington County, IL, City of Saint Louis, MO, Crawford County, MO, Dent County, MO, Douglas County, MO, Franklin County, MO, Howell County, MO, Iron County, MO, Jefferson County, MO, Oregon County, MO, Ozark County, MO, Phelps County, MO, Reynolds County, MO, Saint Charles County, MO, Saint Francois County, MO, Saint Louis County, MO, Sainte Genevieve County, MO, Shannon County, MO, Taney County, MO, Texas County, MO, Washington County, MO, Wright County, MO

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 1, 7:26 PM CDTSevere Thunderstorm WarningSGFChristian, Taney64 min
May 1, 7:29 PM CDTSevere Thunderstorm WarningSGFTexas, Wright46 min
May 1, 7:56 PM CDTSevere Thunderstorm WarningSGFDouglas, Ozark49 min
May 1, 8:19 PM CDTTornado WarningSGFTaney26 min
May 1, 8:45 PM CDTSevere Thunderstorm WarningSGFOzark45 min
May 1, 9:20 PM CDTSevere Thunderstorm WarningSGFTaney40 min
May 1, 10:05 PM CDTSevere Thunderstorm WarningSGFHowell25 min
May 1, 10:25 PM CDTSevere Thunderstorm WarningSGFOregon65 min

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 0.0 hours before the alert went out and 214 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, Springfield, MO at 00:00Z on 2002-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1175 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, Springfield, MO at 00:00Z on 2002-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 square meters per square second.1939587897Sfc1 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
1175 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
1882 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
199 m²/s²
Significant tornado parameter
0.1
Supercell composite
4.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 1, 10:30 PM CDTTornado WatchSPCAlexander, Clay, Crawford, Edwards, Franklin, Gallatin and 21 more6 hr
May 2, 7:30 AM CDTSevere Thunderstorm WatchSPCAlexander, Gallatin, Hardin, Jackson, Johnson, Massac and 5 more5 hr
May 1, 9:00 PM CDTTornado WatchSPCOregon5 hr

Nearby

Tornado Watches in Missouri, 2002Tornado Watches in Illinois, 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.