Alert archive / Iowa / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 5, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Apr 30, 1997, 10:26 AM CDT for Wayne County, Iowa. It was in force for 29 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, 10:26 AM CDT (15:26 UTC)
- Expired
- Apr 30, 1997, 10:55 AM CDT
- In force
- 29 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Wayne County, IA
The radar
The Des Moines radar (KDMX), 115 km from the middle of the area, began a volume at 15:25 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, 3.4 hours before the alert went out and 256 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 KDSM 301526 RRA
SVRDSM
IAC185-301555-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1026 AM CDT WED APR 30 1997
* SEVERE THUNDERSTORM WARNING FOR
SOUTHERN WAYNE COUNTY - SOUTH CENTRAL IOWA
* UNTIL 1055 AM CDT
* SOME AREAS AFFECTED
SEWAL
SEYMBUR
AREAS SOUTHEAST OF CORYDON
* AT 1020 AM CDT RADAR INDICATED A SEVERE THUNDERSTORM ALONG THE
IOWA/MISSOURI BORDER...15 MILES SOUTH OF CORYDO N OR 40 MILES
SOUTHWEST OF OTTUMWA MOVING NORTHEAST AT 40 MPH.
* THE STORM WILL BE INTO RURAL AREAS OF SOUTH CENTRAL WAYNE COUNTY BY
1035 AM.
THIS IS A DANGEROUS STORM. DO NOT GO OUTDOORS.
FELDTWhat 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, 4:56 AM CDT, 5 hours 30 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-011200- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 456 AM CDT WED APR 30 1997 HAZARD...SCATTERED THUNDERSTORMS...WITH ISOLATED THUNDERSTORMS PRODUCING HAIL OVER 1/2 INCH DIAMETER. AREA OF CONCERN...SCATTERED THUNDERSTORMS ARE POSSIBLE OVER THE ENTIRE COUNTY WARNING AREA...WITH ISOLATED THUNDERSTORMS NEAR SEVERE LEVELS OVER SOUTH CENTRAL IOWA. TIMING DETAILS...THROUGH THE MIDDAY HOURS. METEOROLOGICAL COMMENTS...AN AREA OF SHOWERS AND THUNDERSTORMS WHICH DEVELOPED OVER NORTHEAST KANSAS DURING THE EARLY MORNING HOURS CONTINUED MOVING SLOWLY NORTHEAST THIS MORNING. SOME OF THESE STORMS HAVE PRODUCED HAIL OVER 3/4 INCH IN NORTHWEST MISSOURI. THERE IS MARGINAL INSTABILITY FARTHER NORTH ACROSS IOWA...WITH LOW FREEZING LEVELS...INCREASED MOISTURE AND MORE UNSTABLE CONDITIONS MOVING INTO THE AREA. ISOLATED SEVERE STORMS ARE POSSIBLE MAINLY OVER SOUTH CENTRAL IOWA. PRECAUTIONS...SEVERE WEATHER CHANCES WILL BE MINIMAL...HOWEVER THOSE INTERESTED SHOULD STAY TUNED FOR LATER UPDATES AND STATEMENTS. S2/S1
Special weather statement, Apr 30, 4:58 AM CDT, 5 hours 28 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-011200- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 456 AM CDT WED APR 30 1997 HAZARD...SCATTERED THUNDERSTORMS...WITH ISOLATED THUNDERSTORMS PRODUCING HAIL OVER 1/2 INCH DIAMETER. AREA OF CONCERN...SCATTERED THUNDERSTORMS ARE POSSIBLE OVER THE ENTIRE COUNTY WARNING AREA...WITH ISOLATED THUNDERSTORMS NEAR SEVERE LEVELS OVER SOUTH CENTRAL IOWA. TIMING DETAILS...THROUGH THE MIDDAY HOURS. METEOROLOGICAL COMMENTS...AN AREA OF SHOWERS AND THUNDERSTORMS WHICH DEVELOPED OVER NORTHEAST KANSAS DURING THE EARLY MORNING HOURS CONTINUED MOVING SLOWLY NORTHEAST THIS MORNING. SOME OF THESE STORMS HAVE PRODUCED HAIL OVER 3/4 INCH IN NORTHWEST MISSOURI. THERE IS MARGINAL INSTABILITY FARTHER NORTH ACROSS IOWA...WITH LOW FREEZING LEVELS...INCREASED MOISTURE AND MORE UNSTABLE CONDITIONS MOVING INTO THE AREA. ISOLATED SEVERE STORMS ARE POSSIBLE MAINLY OVER SOUTH CENTRAL IOWA. PRECAUTIONS...SEVERE WEATHER CHANCES WILL BE MINIMAL...HOWEVER THOSE INTERESTED SHOULD STAY TUNED FOR LATER UPDATES AND STATEMENTS. S2/S1
Special weather statement, Apr 30, 5:45 AM CDT, 4 hours 41 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-021200- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 545 AM CDT WED APR 30 1997 HAZARD...ALTHOUGH AN ISOLATED THUNDERSTORM IS POSSIBLE TONIGHT...NO SEVERE WEATHER IS EXPECTED ACROSS THE AREA. AREA OF CONCERN...THE ENTIRE COUNTY WARNING AREA. METEOROLOGICAL COMMENTS...ALTHOUGH SHOWERS RECENTLY ENDED ACROSS IOWA...ANOTHER LOW PRESSURE SYSTEM DEVELOPING OVER THE CENTRAL PLAINS WILL AGAIN SPREAD SHOWERS ACROSS THE STATE TONIGHT. WHILE ONLY AN ISOLATED THUNDERSTORM IS POSSIBLE TONIGHT...THERE IS LITTLE INSTABILITY AND NOT MUCH MOISTURE...AND NO SEVERE WEATHER IS EXPECTED. THERE WILL BE A GREATER CHANCE FOR THUNDERSTORMS ALONG WITH HEAVIER AMOUNTS OF RAIN ON FRIDAY HOWEVER AS THE SYSTEM MOVES JUST TO THE SOUTH OF IOWA AND MORE MOISTURE WORKS INTO THE AREA. ALTHOUGH MUCH OF IOWA RECEIVED OVER AN INCH OF PRECIPITATION WITH THE LAST SYSTEM OF LOW PRESSURE...TOTAL PRECIPITATION AMOUNTS FROM 1/2 TO 1 INCH ARE POSSIBLE THROUGH FRIDAY...HOWEVER THE GREATEST AMOUNTS OF RAIN ARE EXPECTED FURTHER SOUTH OVER MISSOURI AND ILLINOIS...AND WITH AN INCH OR LESS OF PRECIPITATION WIDESPREAD FLOODING IS NOT EXPECTED IN THE COUNTY WARNING AREA. PRECAUTIONS...AS THIS IS STILL A DEVELOPING SITUATION WITH THE MAIN THREAT FOR THUNDERSTORMS AND HEAVIER RAIN AMOUNTS 36 TO 48 HOURS OUT...THOSE INTERESTED SHOULD STAY TUNED FOR LATER FORECASTS AND STATEMENTS. S2
Special weather statement, Apr 30, 10:14 AM CDT, 12 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-012100- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 1015 AM CDT WED APR 30 1997 HAZARD...WIDELY SCATTERED THUNDERSTORMS PRODUCING HAIL OVER 1/2 INCH DIAMETER. AREA OF CONCERN...SCATTERED SHOWERS AND EMBEDDED THUNDERSTORMS ARE POSSIBLE OVER THE ENTIRE COUNTY WARNING AREA...WITH ISOLATED THUNDERSTORMS NEAR SEVERE LEVELS OVER THE SOUTHEAST THIRD OF THE STATE. TIMING DETAILS...FROM LATE MORNING THROUGH THIS AFTERNOON. METEOROLOGICAL COMMENTS...A LARGE AREA OF RAIN MOVED THROUGH FROM SOUTHWEST TO NORTHEAST IOWA THROUGH THE MORNING HOURS. THERE WAS A BRIEF BREAK IN THE PRECIPITATION OVER THE SOUTHWEST AND SOUTH CENTRAL HOWEVER...SHOWERS QUICKLY FILLED IN THIS AREA BY MID MORNING. ANOTHER AREA OF SHOWERS AND THUNDERSTORMS WAS MOVING THROUGH NORTHEAST KANSAS AND NORTHWEST MISSOURI. HAIL GREATER THAN 1 INCH IN DIAMETER ARE POSSIBLE WITH THESE STORMS AS THEY MOVE INTO SOUTH CENTRAL IOWA. LATER THIS AFTERNOON THE THREAT OF SEVERE WEATHER WILL SHIFT FURTHER INTO SOUTHEAST IOWA. A BIT OF SUNSHINE WILL FURTHER DESTABILIZE THE ATMOSPHERE IN THIS AREA. PRECAUTIONS...ISOLATED SEVERE STORMS ARE POSSIBLE INTO EARLY AFTERNOON OVER SOUTH CENTRAL IOWA AND INTO SOUTHEAST IOWA THROUGHOUT THE AFTERNOON HOURS. EMERGENCY MANAGERS AND SPOTTERS SHOULD KEEP ABREAST OF THE LATEST FORECASTS. STARK
Special weather statement, Apr 30, 10:15 AM CDT, 11 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-012100- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 1015 AM CDT WED APR 30 1997 HAZARD...WIDELY SCATTERED THUNDERSTORMS PRODUCING HAIL OVER 1/2 INCH DIAMETER. AREA OF CONCERN...SCATTERED SHOWERS AND EMBEDDED THUNDERSTORMS ARE POSSIBLE OVER THE ENTIRE COUNTY WARNING AREA...WITH ISOLATED THUNDERSTORMS NEAR SEVERE LEVELS OVER THE SOUTHEAST THIRD OF THE STATE. TIMING DETAILS...FROM LATE MORNING THROUGH THIS AFTERNOON. METEOROLOGICAL COMMENTS...A LARGE AREA OF RAIN MOVED THROUGH FROM SOUTHWEST TO NORTHEAST IOWA THROUGH THE MORNING HOURS. THERE WAS A BRIEF BREAK IN THE PRECIPITATION OVER THE SOUTHWEST AND SOUTH CENTRAL HOWEVER...SHOWERS QUICKLY FILLED IN THIS AREA BY MID MORNING. ANOTHER AREA OF SHOWERS AND THUNDERSTORMS WAS MOVING THROUGH NORTHEAST KANSAS AND NORTHWEST MISSOURI. HAIL GREATER THAN 1 INCH IN DIAMETER ARE POSSIBLE WITH THESE STORMS AS THEY MOVE INTO SOUTH CENTRAL IOWA. LATER THIS AFTERNOON THE THREAT OF SEVERE WEATHER WILL SHIFT FURTHER INTO SOUTHEAST IOWA. A BIT OF SUNSHINE WILL FURTHER DESTABILIZE THE ATMOSPHERE IN THIS AREA. PRECAUTIONS...ISOLATED SEVERE STORMS ARE POSSIBLE INTO EARLY AFTERNOON OVER SOUTH CENTRAL IOWA AND INTO SOUTHEAST IOWA THROUGHOUT THE AFTERNOON HOURS. EMERGENCY MANAGERS AND SPOTTERS SHOULD KEEP ABREAST OF THE LATEST FORECASTS. STARK
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 11:45 AM CDT | Severe Thunderstorm Warning | DMX | Appanoose, Monroe | 30 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 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.