Alert archive / Missouri / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 54, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 8, 1999, 8:36 PM CDT for Franklin County, Missouri. It was in force for 49 min. 1 report 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, 8:36 PM CDT (01:36 UTC)
- Expired
- Apr 8, 1999, 9:25 PM CDT
- In force
- 49 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
County Franklin County, MO
The radar
The St Louis radar (KLSX), 47 km from the middle of the area, began a volume at 01:37 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, 8:50 PM CDT | Thunderstorm Wind 50 | Washington, 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 |
The nearest sounding before it
Lincoln, IL (KILX), launched 00:00Z, 1.6 hours before the alert went out and 288 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
- 859 J/kg
- Mixed-layer CIN
- -35 J/kg
- Mixed-layer LCL
- 1075 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 344 m²/s²
- 0-3 km storm-relative helicity
- 449 m²/s²
- Significant tornado parameter
- 1.9
- Supercell composite
- 8.7
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Local storm report, Apr 8, 5:45 PM CDT, 2 hours 51 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MISSOURI
545 PM CDT THU APR 08 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0533 PM NOVELTY MO 1 INCH HAIL
04/08/99 KNOX
0538 PM NOVELTY MO 1.75 INCH HAIL
04/08/99 KNOX REPORTED 2 MILES WEST OF
NOVELTY.
WDBLocal storm report, Apr 8, 5:45 PM CDT, 2 hours 51 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE ST LOUIS MISSOURI
545 PM CDT THU APR 08 1999
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0533 PM NOVELTY MO 1 INCH HAIL
04/08/99 KNOX
0538 PM NOVELTY MO 1.75 INCH HAIL
04/08/99 KNOX REPORTED 2 MILES WEST OF
NOVELTY.
WDBSpecial weather statement, Apr 8, 7:47 PM CDT, 49 minutes before
MOZ009-010-018-019-026-027-034-041-047-090130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 747 PM CDT THU APR 8 1999 THE FOLLOWING COUNTIES HAVE BEEN REMOVED FROM TORNADO WATCHES 135 AND 136 IN MISSOURI: SCOTLAND...CLARK...KNOX...LEWIS...SHELBY...MARION...MONROE...BOONE AND MONITEAU. THE SEVERE WEATHER THREAT HAS DIMINISHED FOR TONIGHT IN THESE COUNTIES. BRITT
Special weather statement, Apr 8, 7:47 PM CDT, 49 minutes before
MOZ009-010-018-019-026-027-034-041-047-090130- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 747 PM CDT THU APR 8 1999 THE FOLLOWING COUNTIES HAVE BEEN REMOVED FROM TORNADO WATCHES 135 AND 136 IN MISSOURI: SCOTLAND...CLARK...KNOX...LEWIS...SHELBY...MARION...MONROE...BOONE AND MONITEAU. THE SEVERE WEATHER THREAT HAS DIMINISHED FOR TONIGHT IN THESE COUNTIES. BRITT
Special weather statement, Apr 8, 8:30 PM CDT, 6 minutes before
ILZ095-MOZ035-042-048>050-090200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 830 PM CDT THU APR 8 1999 THE FOLLOWING COUNTIES HAVE BEEN REMOVED FROM TORNADO WATCHES 135 AND 136: IN ILLINOIS: PIKE COUNTY IN MISSOURI: RALLS...AUDRAIN...CALLAWAY...COLE AND OSAGE COUNTIES. THE SEVERE WEATHER THREAT HAS DIMINISHED FOR TONIGHT IN THESE COUNTIES. BRITT
Special weather statement, Apr 8, 8:30 PM CDT, 6 minutes before
ILZ095-MOZ035-042-048>050-090200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE ST LOUIS MO 830 PM CDT THU APR 8 1999 THE FOLLOWING COUNTIES HAVE BEEN REMOVED FROM TORNADO WATCHES 135 AND 136: IN ILLINOIS: PIKE COUNTY IN MISSOURI: RALLS...AUDRAIN...CALLAWAY...COLE AND OSAGE COUNTIES. THE SEVERE WEATHER THREAT HAS DIMINISHED FOR TONIGHT IN THESE COUNTIES. BRITT
The office that day
Everything else NWS St. Louis, MO issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 8, 7:12 PM CDT | Tornado Warning | LSX | Gasconade | 48 min |
| Apr 8, 7:20 PM CDT | Tornado Warning | LSX | Audrain, Montgomery | 50 min |
| Apr 8, 7:33 PM CDT | Tornado Warning | LSX | Franklin, Warren | 47 min |
| Apr 8, 7:42 PM CDT | Tornado Warning | LSX | Pike | 48 min |
| Apr 8, 8:15 PM CDT | Tornado Warning | LSX | Gasconade | 50 min |
| Apr 8, 7:08 PM CDT | Tornado Warning | LSX | Adams | 47 min |
| Apr 8, 7:38 PM CDT | Tornado Warning | LSX | Pike | 47 min |
| Apr 8, 8:27 PM CDT | Tornado Warning | LSX | Greene | 48 min |
| Apr 8, 10:17 PM CDT | Severe Thunderstorm Warning | LSX | Bond, Montgomery | 43 min |
| Apr 8, 10:20 PM CDT | Severe Thunderstorm Warning | LSX | Fayette | 50 min |
Nearby
Severe Thunderstorm Warnings in Missouri, 1999Every severe thunderstorm warning 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.