Alert archive / Iowa / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 159, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 11, 1998, 1:43 PM CDT for Jasper County, Iowa. It was in force for 17 min. 3 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
- Jun 11, 1998, 1:43 PM CDT (18:43 UTC)
- Expired
- Jun 11, 1998, 2:00 PM CDT
- In force
- 17 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Jasper County, IA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 11, 1:45 PM CDT | Thunderstorm Wind 52 | Colfax, IA | |
| Jun 11, 1:50 PM CDT | Thunderstorm Wind 50 | Baxter, IA | |
| Jun 11, 2:00 PM CDT | Thunderstorm Wind 56 | Newburg, IA |
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 nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 6.7 hours before the alert went out and 212 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
- 475 J/kg
- Mixed-layer CIN
- -50 J/kg
- Mixed-layer LCL
- 569 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 163 m²/s²
- 0-3 km storm-relative helicity
- 207 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 4.6
The text
As transmitted, in the capitals the NWS used until 2016.
514 WUUS1 KDSM 111844 RRA SVRDSM IAC099-111900- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 143 PM CDT THU JUN 11 1998 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... JASPER COUNTY IN CENTRAL IOWA * UNTIL 200 PM CDT * AT 140 PM CDT... STORM SPOTTERS REPORTED A LINE OF SEVERE THUNDERSTORMS JUST WEST OF NEWTON OR 25 MILES EAST OF DES MOINES MOVING EAST NORTHEAST AT 45 MPH. * THIS SEVERE THUNDERSTORM CAN BE EXPECTED NEAR... NEWTON NOW ROCK CREEK STATE PARK 153 PM CDT. DAMAGING WINDS AND HEAVY RAIN ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS WINDOWS WERE BLOWN OUT OF HOMES JUST WEST OF COLFAX AT 135 PM PYTLAK
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, Jun 11, 11:08 AM CDT, 2 hours 35 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-120000- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 1108 AM CDT THU JUN 11 1998 HAZARD--WIDESPREAD THUNDERSTORMS PRODUCING 1 TO 2 INCHES OF RAIN AND ISOLATED AMOUNTS UP TO 3 INCHES. ISOLATED SEVERE THUNDERSTORMS WITH WIND GUSTS TO 65 MPH ARE ALSO POSSIBLE. AREA OF CONCERN--THE HEAVY RAIN THREAT EXISTS OVER ALL OF CENTRAL IOWA...WITH THE HEAVIEST WIDESPREAD RAIN EXPECTED NORTHWEST OF A CRESTON-DES MOINES-WATERLOO LINE. SOUTHEAST OF THIS LINE IS WHERE THE RISK OF ISOLATED SEVERE WEATHER EXISTS. TIMING DETAILS--THE HEAVY RAIN THREAT WILL CONTINUE THROUGH AROUND 800 PM. THE SEVERE WEATHER THREAT EXISTS IN SOUTH CENTRAL AND SOUTHEAST IOWA BETWEEN 400 AND 800 PM. METEOROLOGICAL COMMENTS--A POTENT UPPER LEVEL DISTURBANCE OVER EASTERN NEBRASKA IS DRAGGING A WARM FRONT INTO SOUTHEAST IOWA. WIDESPREAD HEAVY RAIN AND THUNDERSTORMS HAVE BROKEN OUT ALONG AND NORTH OF THE WARM FRONT WITH A FEW SPOTS REPORTING SMALL STREAM AND URBAN FLOODING EARLIER THIS MORNING. INDIVIDUAL STORM MOTION IS AT OVER 40 MPH AND SINCE THE SOAKING RAIN IS FALLING OVER A PROLONGED PERIOD...THE FLASH FLOOD THREAT DOES NOT APPEAR TO BE AS HIGH AS WIDESPREAD SMALL STREAM AND URBAN FLOODING. LATER TODAY...A DRY SLOT RACING NORTHEAST ACROSS KANSAS IS EXPECTED TO ENTER THE SOUTHEAST HALF OF THE STATE DURING THE LATE AFTERNOON HOURS. IF THIS CAUSES SKIES TO CLEAR FOR EVEN AN HOUR OR TWO THE ATMOSPHERE WILL RAPIDLY DESTABILIZE AND CAUSE MORE THUNDERSTORMS TO DEVELOP ALONG A COLD FRONT WHICH WILL MOVE ACROSS SOUTHERN IOWA EARLY THIS EVENING. SOUTHWEST WINDS ALOFT IN THE 50 TO 70 MPH RANGE WOULD THEN CAUSE ANY STORMS THAT DEVELOP TO PRODUCE STRAIGHT LINE WINDS AND POSSIBLY SOME HAIL. PRECAUTIONS--THE RISK OF SEVERE WEATHER IS MINIMAL AS LONG AS SKIES REMAIN CLOUDY. IF ANY SUN BREAKS OUT IN SOUTH CENTRAL AND SOUTHEAST IOWA...EMERGENCY MANAG"ERS SHOULD PREPARE FOR SPOTTER ACTIVATION. SHERIFFS DEPARTMENTS AND STORM SPOTTERS SHOULD REPORT ANY HIGH WATER THEY OBSERVE. PYTLAK
Special weather statement, Jun 11, 11:08 AM CDT, 2 hours 35 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-120000- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 1108 AM CDT THU JUN 11 1998 HAZARD--WIDESPREAD THUNDERSTORMS PRODUCING 1 TO 2 INCHES OF RAIN AND ISOLATED AMOUNTS UP TO 3 INCHES. ISOLATED SEVERE THUNDERSTORMS WITH WIND GUSTS TO 65 MPH ARE ALSO POSSIBLE. AREA OF CONCERN--THE HEAVY RAIN THREAT EXISTS OVER ALL OF CENTRAL IOWA...WITH THE HEAVIEST WIDESPREAD RAIN EXPECTED NORTHWEST OF A CRESTON-DES MOINES-WATERLOO LINE. SOUTHEAST OF THIS LINE IS WHERE THE RISK OF ISOLATED SEVERE WEATHER EXISTS. TIMING DETAILS--THE HEAVY RAIN THREAT WILL CONTINUE THROUGH AROUND 800 PM. THE SEVERE WEATHER THREAT EXISTS IN SOUTH CENTRAL AND SOUTHEAST IOWA BETWEEN 400 AND 800 PM. METEOROLOGICAL COMMENTS--A POTENT UPPER LEVEL DISTURBANCE OVER EASTERN NEBRASKA IS DRAGGING A WARM FRONT INTO SOUTHEAST IOWA. WIDESPREAD HEAVY RAIN AND THUNDERSTORMS HAVE BROKEN OUT ALONG AND NORTH OF THE WARM FRONT WITH A FEW SPOTS REPORTING SMALL STREAM AND URBAN FLOODING EARLIER THIS MORNING. INDIVIDUAL STORM MOTION IS AT OVER 40 MPH AND SINCE THE SOAKING RAIN IS FALLING OVER A PROLONGED PERIOD...THE FLASH FLOOD THREAT DOES NOT APPEAR TO BE AS HIGH AS WIDESPREAD SMALL STREAM AND URBAN FLOODING. LATER TODAY...A DRY SLOT RACING NORTHEAST ACROSS KANSAS IS EXPECTED TO ENTER THE SOUTHEAST HALF OF THE STATE DURING THE LATE AFTERNOON HOURS. IF THIS CAUSES SKIES TO CLEAR FOR EVEN AN HOUR OR TWO THE ATMOSPHERE WILL RAPIDLY DESTABILIZE AND CAUSE MORE THUNDERSTORMS TO DEVELOP ALONG A COLD FRONT WHICH WILL MOVE ACROSS SOUTHERN IOWA EARLY THIS EVENING. SOUTHWEST WINDS ALOFT IN THE 50 TO 70 MPH RANGE WOULD THEN CAUSE ANY STORMS THAT DEVELOP TO PRODUCE STRAIGHT LINE WINDS AND POSSIBLY SOME HAIL. PRECAUTIONS--THE RISK OF SEVERE WEATHER IS MINIMAL AS LONG AS SKIES REMAIN CLOUDY. IF ANY SUN BREAKS OUT IN SOUTH CENTRAL AND SOUTHEAST IOWA...EMERGENCY MANAG"ERS SHOULD PREPARE FOR SPOTTER ACTIVATION. SHERIFFS DEPARTMENTS AND STORM SPOTTERS SHOULD REPORT ANY HIGH WATER THEY OBSERVE. PYTLAK
Special weather statement, Jun 11, 1:28 PM CDT, 15 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-120100- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 128 PM CDT THU JUN 11 1998 HAZARD--SCATTERED THUNDERSTORMS PRODUCING 1 TO 2 INCHES OF RAIN. AREA OF CONCERN--ALL OF CENTRAL IOWA...BUT THE THREAT WILL DECREASE AS THE AFTERNOON AND EVENING WEARS ON. TIMING DETAILS--THROUGH 400 PM...AND AGAIN FROM 700 PM UNTIL 1100 PM. METEOROLOGICAL COMMENTS--THE STORM SYSTEM WHICH PRODUCED HEAVY RAIN OVER MUCH OF THE STATE TODAY HAS ACCELERATED RAPIDLY SINCE LATE MORNING INTO CENTRAL IOWA. ISOLATED STRONG THUNDERSTORMS HAVE DEVELOPED OVER CENTRAL IOWA AND HAVE BEEN PRODUCING UP TO 2 INCHES OF RAIN IN AN HOUR...BUT THEY WERE MOVING NORTHEAST AT 50 MPH AND THE SUN WAS BREAKING OUT OVER MUCH OF WESTERN IOWA. WINDS HAVE SHIFTED TO THE WEST AND NORTHWEST BEHIND THIS LOW...GREATLY REDUCING CONVERGENCE AND THE THREAT OF REDEVELOPMENT LATER THIS AFTERNOON. THERE IS ANOTHER COLD FRONT DROPPING SOUTHEAST OUT OF SOUTH DAKOTA AND IT IS EXPECTED TO MOVE INTO THE STATE EARLY THIS EVENING. IT MAY BE ENOUGH TO CAUSE SOME CONVERGENCE AND REFIRE THUNDERSTORMS...BUT WITH THE LOSS OF DAYTIME HEATING AND MOISTURE...THERE IS A GOOD CHANCE THEY WILL REMAIN BELOW SEVERE LEVELS. PRECAUTIONS--MINOR SMALL STREAM AND STREET FLOODING IS POSSIBLE AS THE FIRST LOW PULLS OUT OF THE AREA. ADDITIONAL REDEVELOPMENT IS POSSIBLE LATER THIS EVENING AND WILL BE MONITORED FOR SIGNS OF HEAVY RAIN OR SEVERE WEATHER. HOWEVER THE THREAT APPEARS TO BE DIMINISHING. PYTLAK
Special weather statement, Jun 11, 1:28 PM CDT, 15 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-120100- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 128 PM CDT THU JUN 11 1998 HAZARD--SCATTERED THUNDERSTORMS PRODUCING 1 TO 2 INCHES OF RAIN. AREA OF CONCERN--ALL OF CENTRAL IOWA...BUT THE THREAT WILL DECREASE AS THE AFTERNOON AND EVENING WEARS ON. TIMING DETAILS--THROUGH 400 PM...AND AGAIN FROM 700 PM UNTIL 1100 PM. METEOROLOGICAL COMMENTS--THE STORM SYSTEM WHICH PRODUCED HEAVY RAIN OVER MUCH OF THE STATE TODAY HAS ACCELERATED RAPIDLY SINCE LATE MORNING INTO CENTRAL IOWA. ISOLATED STRONG THUNDERSTORMS HAVE DEVELOPED OVER CENTRAL IOWA AND HAVE BEEN PRODUCING UP TO 2 INCHES OF RAIN IN AN HOUR...BUT THEY WERE MOVING NORTHEAST AT 50 MPH AND THE SUN WAS BREAKING OUT OVER MUCH OF WESTERN IOWA. WINDS HAVE SHIFTED TO THE WEST AND NORTHWEST BEHIND THIS LOW...GREATLY REDUCING CONVERGENCE AND THE THREAT OF REDEVELOPMENT LATER THIS AFTERNOON. THERE IS ANOTHER COLD FRONT DROPPING SOUTHEAST OUT OF SOUTH DAKOTA AND IT IS EXPECTED TO MOVE INTO THE STATE EARLY THIS EVENING. IT MAY BE ENOUGH TO CAUSE SOME CONVERGENCE AND REFIRE THUNDERSTORMS...BUT WITH THE LOSS OF DAYTIME HEATING AND MOISTURE...THERE IS A GOOD CHANCE THEY WILL REMAIN BELOW SEVERE LEVELS. PRECAUTIONS--MINOR SMALL STREAM AND STREET FLOODING IS POSSIBLE AS THE FIRST LOW PULLS OUT OF THE AREA. ADDITIONAL REDEVELOPMENT IS POSSIBLE LATER THIS EVENING AND WILL BE MONITORED FOR SIGNS OF HEAVY RAIN OR SEVERE WEATHER. HOWEVER THE THREAT APPEARS TO BE DIMINISHING. PYTLAK
Nearby
Severe Thunderstorm Warnings in Iowa, 1998Every severe thunderstorm warning 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.