Alert archive / Illinois / Tornado Watches in 1998
Tornado Watch 147
The Storm Prediction Center issued this tornado watch at Mar 30, 1998, 9:00 PM CST for 43 counties in Illinois; 34 counties in Missouri. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 30, 1998, 9:00 PM CST (03:00 UTC)
- Expired
- Mar 31, 1998, 3:00 AM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 77 counties
Adams County, IL, Brown County, IL, Bureau County, IL, Calhoun County, IL, Cass County, IL, Cook County, IL, DeKalb County, IL, DuPage County, IL, Fulton County, IL, Greene County, IL, Grundy County, IL, Hancock County, IL, Henderson County, IL, Henry County, IL, Jersey County, IL, Kane County, IL, Kendall County, IL, Knox County, IL, Lake County, IL, LaSalle County, IL, Lee County, IL, Livingston County, IL, Logan County, IL, Macoupin County, IL, Marshall County, IL, Mason County, IL, McDonough County, IL, McLean County, IL, Menard County, IL, Morgan County, IL, Ogle County, IL, Peoria County, IL, Pike County, IL, Putnam County, IL, Sangamon County, IL, Schuyler County, IL, Scott County, IL, Stark County, IL, Tazewell County, IL, Warren County, IL, Whiteside County, IL, Will County, IL, Woodford County, IL, Audrain County, MO, Boone County, MO, Callaway County, MO, Camden County, MO, Cole County, MO, Crawford County, MO, Dallas County, MO, Dent County, MO, Franklin County, MO, Gasconade County, MO, Greene County, MO, Hickory County, MO, Laclede County, MO, Lawrence County, MO, Lincoln County, MO, Maries County, MO, Marion County, MO, Miller County, MO, Moniteau County, MO, Monroe County, MO, Montgomery County, MO, Morgan County, MO, Osage County, MO, Phelps County, MO, Pike County, MO, Polk County, MO, Pulaski County, MO, Ralls County, MO, Saint Charles County, MO, Saint Louis County, MO, Texas County, MO, Warren County, MO, Webster County, MO, Wright County, MO
The radar
The St Louis radar (KLSX), 76 km from the middle of the area, began a volume at 03:04 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
7 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 30, 9:01 PM CST | Severe Thunderstorm Warning | SGF | Laclede | 34 min |
| Mar 30, 9:15 PM CST | Severe Thunderstorm Warning | LSX | Monroe | 30 min |
| Mar 30, 10:03 PM CST | Severe Thunderstorm Warning | ILX | Knox | 57 min |
| Mar 30, 10:11 PM CST | Severe Thunderstorm Warning | SGF | Christian, Douglas, Webster | 49 min |
| Mar 30, 10:51 PM CST | Severe Thunderstorm Warning | DVN | Carroll, Whiteside | 49 min |
| Mar 30, 10:58 PM CST | Severe Thunderstorm Warning | ILX | Fulton | 47 min |
| Mar 30, 11:14 PM CST | Severe Thunderstorm Warning | ILX | Knox | 46 min |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 3.0 hours before the alert went out and 259 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
- 575 J/kg
- Mixed-layer CIN
- -64 J/kg
- Mixed-layer LCL
- 934 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 158 m²/s²
- 0-3 km storm-relative helicity
- 132 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 2.6
The text
As transmitted, in the capitals the NWS used until 2016.
026 WWUS9 KMKC 310230 SEL7 MKC WW 310230 MOZ000-ILZ000-310900- BULLETIN - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 147 STORM PREDICTION CENTER NORMAN OK 830 PM CST MON MAR 30 1998 THE STORM PREDICTION CENTER HAS ISSUED A TORNADO WATCH FOR PORTIONS OF CENTRAL AND EASTERN MISSOURI NORTHERN AND WESTERN ILLINOIS EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 900 PM UNTIL 300 AM CST. TORNADOES...HAIL TO 1 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS. THE TORNADO WATCH AREA IS ALONG AND 65 STATUTE MILES EAST AND WEST OF A LINE FROM 30 MILES EAST SOUTHEAST OF SPRINGFIELD MISSOURI TO 35 MILES EAST NORTHEAST OF ROCKFORD ILLINOIS. 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...THIS TORNADO WATCH REPLACES TORNADO WATCH NUMBER 142...SEVERE THUNDERSTORM WATCH NUMBER 144. WATCH NUMBER 142...144 WILL NOT BE IN EFFECT AFTER 900 PM CST. CONTINUE...WW 145...WW 146. DISCUSSION...THUNDERSTORMS CONTINUE ALONG AND AHEAD OF SURFACE COLD FRONT. ALTHOUGH INSTABILITY IS LIMITED...SHEAR PROFILES ARE QUITE FAVORABLE FOR DAMAGING WIND GUSTS AND ISOLATED TORNADOES. AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 1 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM MOTION VECTOR 23040. ...VESCIO 370,0940 421,0894 421,0870 370,0914
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 30, 7:00 PM CST | Tornado Watch | SPC | Barry, McDonald, Newton, Ozark, Stone, Taney | 6 hr |
| Mar 30, 11:00 PM CST | Tornado Watch | SPC | Butler, Carter, Douglas, Howell, Oregon, Ozark and 2 more | 5 hr |
Nearby
Tornado Watches in Illinois, 1998Tornado Watches in Missouri, 1998Every tornado watch in 1998
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.