Alert archive / Missouri / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 35, NWS St. Louis, MO
NWS St. Louis, MO issued this severe thunderstorm warning at Apr 30, 1997, 11:56 AM CDT for Knox County, Scotland County, Missouri. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Apr 30, 1997, 11:56 AM CDT (16:56 UTC)
- Expired
- Apr 30, 1997, 12:45 PM CDT
- In force
- 49 min
- Issued by
- NWS St. Louis, MO
- Area
- Whole counties
Counties Knox County, MO, Scotland County, MO
The radar
The Quad Cities radar (KDVN), 197 km from the middle of the area, began a volume at 16:58 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.
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 4.9 hours before the alert went out and 202 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
- 1366 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 75 m²/s²
- 0-3 km storm-relative helicity
- 180 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSTL 301657 RRA SVRSTL MOC103-199-301745- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE ST LOUIS MO 1156 AM CDT WED APR 30 1997 THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1245 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN NORTHEAST MISSOURI ...NORTHWESTERN KNOX COUNTY...SCOTLAND COUNTY AT 1155 PM...RADAR INDICATED A SEVERE THUNDERSTORM OVER EASTERN ADAIR COUNTY MOVING NORTHEAST AT 45 MPH. TOWNS IN THE PATH OF THIS STORM ARE BIBLE GROVE...GREENSBURG AND MEMPHIS. THIS STORM WILL PRODUCE STRONG AND GUSTY WIND GREATER THAN 55 MPH AND HAIL AROUND AN INCH IN DIAMETER. THIS IS A DANGEROUS STORM! BE PREPARED FOR DAMAGING WINDS...HAIL AND DEADLY LIGHTNING. STAY INSIDE AND AWAY FROM WINDOWS. LEWIS
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
Special weather statement, Apr 30, 7:00 AM CDT, 4 hours 56 minutes before
MOZ042-041-050-010-048-072-062-059-084-018-019-052-085-027-047- 051-034-049-036-035-099-061-075-074-063-064-009-026-060-073-ILZ095- 064-096-098-069-065-058-099-059-100-070-102-060-097-079-101-074- MOZ065-291600- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 600 AM CST WED APR 30 1997 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. THERE IS A MODERATE RISK OF SEVERE WEATHER THIS AFTERNOON OVER EXTREME EASTERN MISSOURI AND CENTRAL AND SOUTHERN ILLINOIS. THIS IS AN AREA GENERALLY SOUTH AND EAST OF A LINE FROM HILLSBORO ILLINOIS TO ST. LOUIS TO CAPE GIRARDEAU. THERE IS ALSO A SLIGHT RISK OF SEVERE WEATHER ACROSS MUCH OF THE EASTERN HALF OF MISSOURI AND NORTHERN ILLINOIS. THE SLIGHT RISK AREA COVERS THE REST OF THE ST. LOUIS COUNTY WARNING AREA. A DEEP LOW PRESSURE SYSTEM WILL FROM KANSAS INTO NORTHEAST ILLINOIS BY THIS EVENING. WITH THIS LOW...A STRONG COLD FRONT WILL MOVE FROM WEST TO EAST ACROSS MISSOURI TODAY. SHOWERS AND THUNDERSTORMS WILL DEVELOP ALONG AND AHEAD OF THE FRONT. WITH THE THE EXPECTED SHEAR AND INSTABILITY OF THE ATMOSPHERE AS THE FRONT PASSES...SOME OF THE STORMS MAY BE SEVERE. STORM SPOTTER GROUPS AND EMERGENCY MANAGERS SHOULD KEEP ADVISED OF THE LATEST FORECAST FOR POSSIBLE SKYWARN ACTION FROM LATE THIS MORNING THROUGH THE EARLY EVENING. AMS
Special weather statement, Apr 30, 11:33 AM CDT, 23 minutes before
MOZ042-041-050-010-048-072-062-059-084-018-019-052-085-027-047- 051-034-049-036-035-099-061-075-074-063-064-009-026-060-073-ILZ095- 064-096-098-069-065-058-099-059-100-070-102-060-097-079-101-074- MOZ065-291600- SEVERE WEATHER OUTLOOK NATIONAL WEATHER SERVICE ST LOUIS MO 1130 AM CST WED APR 30 1997 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. THERE IS A MODERATE RISK OF SEVERE WEATHER THIS AFTERNOON OVER EXTREME EASTERN MISSOURI AND CENTRAL AND NORTHERN ILLINOIS. THIS IS AN AREA GENERALLY NORTH AND EAST OF A LINE FROM SALEM ILLINOIS TO ST. LOUIS NORTHWEST ALONG THE MISSISSIPPI RIVER TO THE IOWA BORDER. THERE IS ALSO A SLIGHT RISK OF SEVERE WEATHER ACROSS MUCH OF THE EASTERN HALF OF MISSOURI AND NORTHERN ILLINOIS. THE SLIGHT RISK AREA COVERS THE REST OF THE ST. LOUIS COUNTY WARNING AREA. A LOW PRESSURE SYSTEM IS MOVING RAPIDLY NORTHEAST ACROSS NORTHERN MISSOURI THIS MORNING...AND WILL MOVE INTO NORTHEASTERN ILLINOIS BY THIS EVENING. A COLD FRONT WILL SWEEP EASTWARD ACROSS EASTERN MISSOURI THIS AFTERNOON...TRIGGERING STRONG THUNDERSTORMS. SOME \OF THESE STORMS MAY BECOME SEVERE. STORM SPOTTER GROUPS AND EMERGENCY MANAGERS SHOULD KEEP ADVISED OF THE LATEST FORECAST FOR POSSIBLE SKYWARN ACTION FROM LATE THIS MORNING THROUGH THE EARLY EVENING. WDB
Nearby
Severe Thunderstorm Warnings in Missouri, 1997Every severe thunderstorm warning in 1997
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.