Alert archive / Missouri / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 260

May 8, 200212 counties in Illinois; 26 counties in Missouri

The Storm Prediction Center issued this severe thunderstorm watch at May 8, 2002, 8:30 PM CDT for 12 counties in Illinois; 26 counties in Missouri. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 8, 2002, 8:30 PM CDT (01:30 UTC)
Expired
May 9, 2002, 2:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 38 counties

Adams County, IL, Brown County, IL, Calhoun County, IL, Cass County, IL, Greene County, IL, Jersey County, IL, Mason County, IL, Menard County, IL, Morgan County, IL, Pike County, IL, Schuyler County, IL, Scott County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, City of Saint Louis, MO, Cole County, MO, Cooper County, MO, Franklin County, MO, Gasconade County, MO, Howard County, MO, Knox County, MO, Lewis County, MO, Lincoln County, MO, Macon County, MO, Marion County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Osage County, MO, Pike County, MO, Ralls County, MO, Randolph County, MO, Saint Charles County, MO, Saint Louis County, MO, Shelby County, MO, Warren County, MO

The radar

The St Louis radar (KLSX), 101 km from the middle of the area, began a volume at 01:33 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

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

IssuedProductOfficeCountiesLasted
May 8, 8:32 PM CDTFlash Flood WarningLSXMonroe, Shelby5 hr
May 8, 8:45 PM CDTSevere Thunderstorm WarningEAXMacon30 min
May 8, 9:59 PM CDTTornado WarningLSXPike46 min
May 8, 10:02 PM CDTFlash Flood WarningLSXCole, Moniteau4 hr
May 8, 10:18 PM CDTSevere Thunderstorm WarningILXCass, Morgan, Schuyler, Scott57 min
May 8, 10:27 PM CDTFlash Flood WarningSGFMorgan3 hr
May 8, 10:45 PM CDTSevere Thunderstorm WarningILXFulton, Mason45 min
May 8, 10:54 PM CDTFlash Flood WarningILXCass, Morgan, Scott6 hr
May 8, 10:58 PM CDTTornado WarningILXFulton, Mason47 min
May 8, 11:16 PM CDTFlash Flood WarningILXMason6 hr
May 8, 11:24 PM CDTSevere Thunderstorm WarningILXCass, Menard, Morgan, Sangamon51 min
May 8, 11:24 PM CDTFlash Flood WarningLSXBoone, Callaway, Gasconade, Montgomery, Osage6 hr

The nearest sounding before it

Lincoln, IL (KILX), launched 00:00Z, 1.5 hours before the alert went out and 291 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, Lincoln, IL at 00:00Z on 2002-05-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1076 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, Lincoln, IL at 00:00Z on 2002-05-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 175 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
1076 J/kg
Mixed-layer CIN
-41 J/kg
Mixed-layer LCL
1020 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
175 m²/s²
0-3 km storm-relative helicity
229 m²/s²
Significant tornado parameter
1.2
Supercell composite
9.2

Open this sounding in Storm Lab

The text

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

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 8, 9:00 PM CDTSevere Thunderstorm WatchSPCHancock, Henderson, Jo Daviess, McDonough, Mercer, Rock Island and 1 more5 hr
May 8, 11:30 PM CDTSevere Thunderstorm WatchSPCChampaign, DeWitt, Douglas, Edgar, Ford, Iroquois and 12 more5 hr
May 9, 2:30 AM CDTSevere Thunderstorm WatchSPCChampaign, Clark, Clay, Coles, Crawford, Cumberland and 9 more6 hr
May 8, 8:00 PM CDTSevere Thunderstorm WatchSPCBarton, Bates, Benton, Camden, Cedar, Christian and 11 more6 hr

Nearby

Severe Thunderstorm Watches in Missouri, 2002Severe Thunderstorm Watches in Illinois, 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.