Alert archive / Missouri / Tornado Warnings in 1999
Tornado Warning 10, NWS St. Louis, MO
NWS St. Louis, MO issued this tornado warning at Apr 8, 1999, 5:21 PM CDT for Knox County, Shelby County, Missouri. It was in force for 64 min. 4 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Apr 8, 1999, 5:21 PM CDT (22:21 UTC)
- Expired
- Apr 8, 1999, 6:25 PM CDT
- In force
- 64 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Knox County, MO, Shelby County, MO
The radar
The St Louis radar (KLSX), 187 km from the middle of the area, began a volume at 22:22 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 8, 5:30 PM CDT | Hail 1.75 | Novelty, MO | |
| Apr 8, 5:33 PM CDT | Hail 1 | Novelty, MO | |
| Apr 8, 5:35 PM CDT | Tornado F2 | Novelty, MO | |
| Apr 8, 5:38 PM CDT | Hail 1.75 | Novelty, MO |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 8, 5:15 PM CDT | Tornado Watch | SPC | 4 hr |
| Apr 8, 5:15 PM CDT | Tornado Watch | SPC | 4 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 10.4 hours before the alert went out and 229 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2467 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 6 m²/s²
- 0-3 km storm-relative helicity
- 115 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
999 WFUS1 KSTL 082222 RRA TORSTL MOC103-205-082325- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 521 PM CDT THU APR 8 1999 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A * TORNADO WARNING FOR... KNOX COUNTY IN NORTHEASTERN MISSOURI NORTHERN SHELBY COUNTY IN NORTHEASTERN MISSOURI * UNTIL 625 PM CDT * AT 520 PM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A TORNADO 8 MILES NORTH OF MACON... MOVING NORTHEAST AT 45 MPH. * LOCATIONS IN THE PATH... NOVELTY LEONARD NEWARK KNOX CITY SHELBYVILLE THIS STORM HAS A HISTORY OF PRODUCING TORNADOES AND LARGE HAIL THIS IS A DANGEROUS SITUATION IF IN THE PATH...TAKE COVER NOW MOVE TO A BASEMENT IF AVAILABLE. IF NOT...STAY ON THE LOWEST LEVEL AND GO TO A SMALL INTERIOR ROOM. MOBILE HOMES AND AUTOMOBILESHOULD BE ABANDONED IN FAVOR OF A STRONG STRUCTURE. AS A LAST RESORT... MOVE TO A DITCH OR CULVERT AND COVER YOUR HEAD. TPS/JP
What forecasters said that day
The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Apr 8, 11:55 AM CDT, 5 hours 26 minutes before
ILZ058>060-064-065-069-070-074-079-095>102-MOZ009-010-018-019-026- 027-034>036-041-042-047>052-059>065-072>075-084-085-099-091100- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 1155 AM CDT THU APR 8 1999 ...HIGH RISK OF SEVERE THUNDERSTORMS FOR EASTERN MISSOURI AND SOUTHWEST ILLINOIS... THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NWS OFFICE IN ST LOUIS. AREAS INCLUDED ARE PARTS OF CENTRAL...NORTHEAST... AND EAST CENTRAL MISSOURI...AND SOUTHWEST ILLINOIS. A HIGH RISK OF SEVERE THUNDERSTORMS EXISTS FOR ALL OF EASTERN MISSOURI AND SOUTHWEST ILLINOIS. SKYWARN ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON AND THIS EVENING. A WARM FRONT EXTENDED ACROSS CENTRAL MISSOURI LATE THIS MORNING. SCATTERED SHOWERS AND THUNDERSTORMS HAVE DEVELOPED OVER EASTERN MISSOURI AND SOUTHWEST ILLINOIS. THESE THUNDERSTORMS HAVE REMAINED BELOW SEVERE LIMITS THIS MORNING. THE WARM FRONT WILL MOVE THROUGH ALL BUT NORTHEAST MISSOURI AND WEST-CENTRAL THIS AFTERNOON...AND WILL MOVE NORTH OF THESE AREAS BY EARLY THIS EVENING. TO THE SOUTH OF THE WARM FRONT...STRONG SOUTH WINDS WILL BRING VERY WARM...HUMID...AND UNSTABLE AIR OVER MOST OF EASTERN MISSOURI AND SOUTHWESTERN ILLINOIS. ATMOSPHERIC CONDITIONS WILL THEN BECOME IDEAL FOR THUNDERSTORM DEVELOPMENT. A COLD FRONT WILL ENTER WESTERN MISSOURI EARLY THIS AFTERNOON AND PUSH EASTWARD INTO CENTRAL MISSOURI BY EARLY THIS EVENING...AND THROUGH EASTERN MISSOURI BY 1000 PM. THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG AND AHEAD OF THE FRONT. GIVEN THE UNSTABLE AIR AND THE STRONG WINDS AT ALL LEVELS OF THE ATMOSPHERE...SOME OF THESE STORMS ARE EXPECTED TO BECOME RAPIDLY SEVERE. LOOK FOR THUNDERSTORM MOVEMENT TO BE TO THE EAST OR NORTHEAST AT 50 TO 60 MPH. ALL THUNDERSTORMS WILL BE ACCOMPANIED BY DANGEROUS LIGHTNING AND OCCASIONALLY HEAVY DOWNPOURS. IN ADDITION...SOME THUNDERSTORMS WILL CONTAIN HAIL IN EXCESS OF THREE QUARTERS OF AN INCH IN DIAMETER...WIND GUSTS GREATER THAN 55 MPH...AND POSSIBLY TORNADOES. AGAIN...A HIGH RISK OF SEVERE THUNDERSTORMS EXISTS FOR THE REGION. SKYWARN ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON AND THIS EVENING. BRITT/TES
Special weather statement, Apr 8, 11:55 AM CDT, 5 hours 26 minutes before
ILZ058>060-064-065-069-070-074-079-095>102-MOZ009-010-018-019-026- 027-034>036-041-042-047>052-059>065-072>075-084-085-099-091100- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 1155 AM CDT THU APR 8 1999 ...HIGH RISK OF SEVERE THUNDERSTORMS FOR EASTERN MISSOURI AND SOUTHWEST ILLINOIS... THIS OUTLOOK COVERS THE COUNTY WARNING AREA OF THE NWS OFFICE IN ST LOUIS. AREAS INCLUDED ARE PARTS OF CENTRAL...NORTHEAST... AND EAST CENTRAL MISSOURI...AND SOUTHWEST ILLINOIS. A HIGH RISK OF SEVERE THUNDERSTORMS EXISTS FOR ALL OF EASTERN MISSOURI AND SOUTHWEST ILLINOIS. SKYWARN ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON AND THIS EVENING. A WARM FRONT EXTENDED ACROSS CENTRAL MISSOURI LATE THIS MORNING. SCATTERED SHOWERS AND THUNDERSTORMS HAVE DEVELOPED OVER EASTERN MISSOURI AND SOUTHWEST ILLINOIS. THESE THUNDERSTORMS HAVE REMAINED BELOW SEVERE LIMITS THIS MORNING. THE WARM FRONT WILL MOVE THROUGH ALL BUT NORTHEAST MISSOURI AND WEST-CENTRAL THIS AFTERNOON...AND WILL MOVE NORTH OF THESE AREAS BY EARLY THIS EVENING. TO THE SOUTH OF THE WARM FRONT...STRONG SOUTH WINDS WILL BRING VERY WARM...HUMID...AND UNSTABLE AIR OVER MOST OF EASTERN MISSOURI AND SOUTHWESTERN ILLINOIS. ATMOSPHERIC CONDITIONS WILL THEN BECOME IDEAL FOR THUNDERSTORM DEVELOPMENT. A COLD FRONT WILL ENTER WESTERN MISSOURI EARLY THIS AFTERNOON AND PUSH EASTWARD INTO CENTRAL MISSOURI BY EARLY THIS EVENING...AND THROUGH EASTERN MISSOURI BY 1000 PM. THUNDERSTORMS ARE EXPECTED TO DEVELOP ALONG AND AHEAD OF THE FRONT. GIVEN THE UNSTABLE AIR AND THE STRONG WINDS AT ALL LEVELS OF THE ATMOSPHERE...SOME OF THESE STORMS ARE EXPECTED TO BECOME RAPIDLY SEVERE. LOOK FOR THUNDERSTORM MOVEMENT TO BE TO THE EAST OR NORTHEAST AT 50 TO 60 MPH. ALL THUNDERSTORMS WILL BE ACCOMPANIED BY DANGEROUS LIGHTNING AND OCCASIONALLY HEAVY DOWNPOURS. IN ADDITION...SOME THUNDERSTORMS WILL CONTAIN HAIL IN EXCESS OF THREE QUARTERS OF AN INCH IN DIAMETER...WIND GUSTS GREATER THAN 55 MPH...AND POSSIBLY TORNADOES. AGAIN...A HIGH RISK OF SEVERE THUNDERSTORMS EXISTS FOR THE REGION. SKYWARN ACTIVATION WILL LIKELY BE NEEDED THIS AFTERNOON AND THIS EVENING. BRITT/TES
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 5:46 PM CDT | Severe Thunderstorm Warning | LSX | Boone | 59 min |
| Apr 8, 5:50 PM CDT | Tornado Warning | LSX | Lewis | 50 min |
| Apr 8, 5:54 PM CDT | Tornado Warning | LSX | Boone | 51 min |
| Apr 8, 6:09 PM CDT | Tornado Warning | LSX | Clark | 46 min |
| Apr 8, 6:15 PM CDT | Tornado Warning | LSX | Cole | 50 min |
| Apr 8, 6:21 PM CDT | Tornado Warning | LSX | Audrain | 49 min |
| Apr 8, 6:34 PM CDT | Tornado Warning | LSX | Shelby | 46 min |
| Apr 8, 6:40 PM CDT | Tornado Warning | LSX | Lewis | 50 min |
| Apr 8, 6:48 PM CDT | Tornado Warning | LSX | Osage | 47 min |
| Apr 8, 6:52 PM CDT | Tornado Warning | LSX | Pike, Ralls | 48 min |
Nearby
Tornado Warnings in Missouri, 1999Every tornado warning in 1999Tornadoes in 1999
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.