Alert archive / Kansas / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 621
The Storm Prediction Center issued this severe thunderstorm watch at Aug 18, 2002, 7:30 PM CDT for 44 counties in Kansas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Aug 18, 2002, 7:30 PM CDT (00:30 UTC)
- Expired
- Aug 19, 2002, 1:00 AM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 44 counties
Anderson County, KS, Atchison County, KS, Barton County, KS, Brown County, KS, Chase County, KS, Clay County, KS, Cloud County, KS, Coffey County, KS, Dickinson County, KS, Douglas County, KS, Ellis County, KS, Ellsworth County, KS, Franklin County, KS, Geary County, KS, Graham County, KS, Hodgeman County, KS, Jackson County, KS, Jefferson County, KS, Jewell County, KS, Lincoln County, KS, Lyon County, KS, Marion County, KS, Marshall County, KS, McPherson County, KS, Mitchell County, KS, Morris County, KS, Nemaha County, KS, Ness County, KS, Osage County, KS, Osborne County, KS, Ottawa County, KS, Pawnee County, KS, Pottawatomie County, KS, Republic County, KS, Rice County, KS, Riley County, KS, Rooks County, KS, Rush County, KS, Russell County, KS, Saline County, KS, Shawnee County, KS, Trego County, KS, Wabaunsee County, KS, Washington County, KS
Warnings issued inside it
4 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 18, 8:43 PM CDT | Severe Thunderstorm Warning | GLD | Graham | 62 min |
| Aug 18, 8:46 PM CDT | Severe Thunderstorm Warning | DDC | Trego | 59 min |
| Aug 18, 9:35 PM CDT | Severe Thunderstorm Warning | DDC | Ellis | 55 min |
| Aug 18, 9:50 PM CDT | Severe Thunderstorm Warning | DDC | Trego | 40 min |
The nearest sounding before it
Topeka, KS (KTOP), launched 00:00Z, 0.5 hours before the alert went out and 219 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
- 4282 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 1435 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 82 m²/s²
- 0-3 km storm-relative helicity
- 213 m²/s²
- Significant tornado parameter
- 1.8
- Supercell composite
- 19.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 WWUS20 KWNS 190032 SEL1 SPC WW 190030 KSZ000-190600- URGENT - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WATCH NUMBER 621 STORM PREDICTION CENTER NORMAN OK 730 PM CDT SUN AUG 18 2002 THE STORM PREDICTION CENTER HAS ISSUED A SEVERE THUNDERSTORM WATCH FOR PORTIONS OF CENTRAL AND EASTERN KANSAS EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 730 PM UNTIL 100 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 60 STATUTE MILES NORTH AND SOUTH OF A LINE FROM 40 MILES SOUTH SOUTHWEST OF HILL CITY KANSAS TO 20 MILES EAST OF TOPEKA KANSAS. 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. DISCUSSION...AIR MASS OVER MUCH OF CENTRAL AND EASTERN KANSAS IS VERY UNSTABLE WITH MIXED LAYER CAPE FROM 3000 TO 4500 J/KG. MODEL DATA INDCIATES STRONG UVVS OVER THIS AREA NEXT HOUR OR SO ENOUGH TO POSSIBLY BREAK 1-2 DEG C CAP ACROSS THE AREA. LOW LEVEL JET OF 30- 40 KT IS ALSO EXPECTED TO ENHANCE ASCENT FOR DEVELOPMENT. LOW/MID LEVEL SHEAR VECTOR IS 25-30 KT ATTM WHICH MAY BE SUFFICIENT FOR SUPERCELLS. 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 28035. ...MCCARTHY 394,1000 395,0951 381,0951 375,1000
Nearby
Severe Thunderstorm Watches in Kansas, 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.