Alert archive / Iowa / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 276, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 21, 1998, 8:13 AM CDT for Hamilton County, Wright County, Iowa. It was in force for 32 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
- Jul 21, 1998, 8:13 AM CDT (13:13 UTC)
- Expired
- Jul 21, 1998, 8:45 AM CDT
- In force
- 32 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Hamilton County, IA, Wright County, IA
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 21, 6:15 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 1.2 hours before the alert went out and 255 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
- 2504 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- -111 m²/s²
- 0-3 km storm-relative helicity
- -1 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
547 WUUS1 KDSM 211314 RRA SVRDSM IAC079-081-189-197-211345- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 813 AM CDT TUE JUL 21 1998 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... HAMILTON COUNTY IN CENTRAL IOWA HANCOCK COUNTY IN NORTH CENTRAL IOWA WINNEBAGO COUNTY IN NORTH CENTRAL IOWA WRIGHT COUNTY IN NORTH CENTRAL IOWA * UNTIL 845 AM CDT * AT 810 AM CDT... DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS 34 MILES NORTH NORTHEAST OF FORT DODGE OR 7 MILES WEST NORTHWEST OF KANAWHA MOVING EAST AT 65 MPH. * THIS STORM CAN BE EXPECTED NEAR... BRITT BY NOW FOREST CITY BY NOW KANAWHA BY NOW GOODELL BY 816 AM CDT BELMOND BY 816 AM CDT GARNER BY 817 AM CDT CLARION BY 817 AM CDT WEBSTER CITY BY 817 AM CDT DAMAGING WINDS AND LARGE HAIL ARE LIKELY. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS WINDS TO 70 MPH ARE LIKELY. KULA
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, Jul 21, 5:33 AM CDT, 2 hours 40 minutes before
IAZ004>007-015>017-023>028-035>039-047>050-061-062-075-086-220000- CENTRAL IOWA THUNDERSTORM OUTLOOK...CORRECTED DATE IN MND HEADER NATIONAL WEATHER SERVICE DES MOINES IA 533 AM CDT TUE JUL 21 1998 HAZARD--SCATTERED THUNDERSTORMS WITH WIND GUSTS TO 60 MPH AND HEAVY RAINFALL. AREA OF CONCERN AND TIMING DETAILS--NORTHEAST OF A SAC CITY TO MASON CITY LINE ANYTIME TODAY. SOUTHEAST OF THIS LINE THIS EVENING INTO THE OVERNIGHT HOURS. METEOROLOGICAL COMMENTS--A COLD FRONT LOCATED FROM NORTHEAST NEBRASKA THROUGH NORTHWEST IOWA INTO SOUTHEASTERN MINNESOTA WILL CONTINUE TO MOVE SOUTHEAST TODAY. MEANWHILE...LOW LEVEL SOUTHERLY WINDS WILL CONTINUE TO TRANSPORT MOISTURE NORTHWARD INTO AND OVER THE FRONT. SCATTERED THUNDERSTORMS OVER SOUTHEAST SOUTH DAKOTA WILL CONTINUE TO MOVE EAST THIS MORNING INTO NORTHERN IOWA. SOME OF THESE STORMS COULD PRODUCE WIND GUSTS TO 60 MPH THIS MORNING. ADDITIONAL ACTIVITY COULD REDEVELOP LATER THIS AFTERNOON OVER THE OUTLOOK AREA AS WELL. DUE TO WARM TEMPERATURES ALOFT...ANY HAIL THAT OCCURS SHOULD REMAIN BELOW SEVERE CRITERIA...OR LESS THAN THREE-QUARTERS OF AN INCH IN DIAMETER. AS THE FRONT CONTINUES SOUTHWARD LATER THIS EVENING... ADDITIONAL SHOWERS AND THUNDERSTORMS WILL OVERSPREAD THE REST OF THE STATE WITH WIND GUSTS TO 60 MPH AND HEAVY RAIN THE PRIMARY THREAT. THE FRONT MAY STALL OUT OVER CENTRAL OR SOUTHERN IOWA OVERNIGHT... BRINGING REPEATED HEAVY RAINS TO THESE PORTIONS OF THE STATE. WITH THE RECENT HOT AND DRY WEATHER...FLOODING SHOULD NOT BE A CONCERN... THOUGH IF REPEATED HEAVY RAIN IS RECEIVED...SOME MINOR FLOODING COULD OCCUR. PRECAUTIONS -SPOTTERS MAY BE NEEDED OVER NORTHERN IOWA TODAY AND THE REST OF THE STATE TONIGHT. KEEP IN MIND THERE IS ALSO A HEAT ADVISORY OUT FOR ABOUT THE SOUTHERN HALF OF IOWA. IF YOU MUST BE OUTSIDE IN THESE AREAS...DRINK PLENTY OF WATER AND DON/T OVEREXERT YOURSELF. SEARCY
Special weather statement, Jul 21, 5:33 AM CDT, 2 hours 40 minutes before
IAZ004>007-015>017-023>028-035>039-047>050-061-062-075-086-220000- CENTRAL IOWA THUNDERSTORM OUTLOOK...CORRECTED DATE IN MND HEADER NATIONAL WEATHER SERVICE DES MOINES IA 533 AM CDT TUE JUL 21 1998 HAZARD--SCATTERED THUNDERSTORMS WITH WIND GUSTS TO 60 MPH AND HEAVY RAINFALL. AREA OF CONCERN AND TIMING DETAILS--NORTHEAST OF A SAC CITY TO MASON CITY LINE ANYTIME TODAY. SOUTHEAST OF THIS LINE THIS EVENING INTO THE OVERNIGHT HOURS. METEOROLOGICAL COMMENTS--A COLD FRONT LOCATED FROM NORTHEAST NEBRASKA THROUGH NORTHWEST IOWA INTO SOUTHEASTERN MINNESOTA WILL CONTINUE TO MOVE SOUTHEAST TODAY. MEANWHILE...LOW LEVEL SOUTHERLY WINDS WILL CONTINUE TO TRANSPORT MOISTURE NORTHWARD INTO AND OVER THE FRONT. SCATTERED THUNDERSTORMS OVER SOUTHEAST SOUTH DAKOTA WILL CONTINUE TO MOVE EAST THIS MORNING INTO NORTHERN IOWA. SOME OF THESE STORMS COULD PRODUCE WIND GUSTS TO 60 MPH THIS MORNING. ADDITIONAL ACTIVITY COULD REDEVELOP LATER THIS AFTERNOON OVER THE OUTLOOK AREA AS WELL. DUE TO WARM TEMPERATURES ALOFT...ANY HAIL THAT OCCURS SHOULD REMAIN BELOW SEVERE CRITERIA...OR LESS THAN THREE-QUARTERS OF AN INCH IN DIAMETER. AS THE FRONT CONTINUES SOUTHWARD LATER THIS EVENING... ADDITIONAL SHOWERS AND THUNDERSTORMS WILL OVERSPREAD THE REST OF THE STATE WITH WIND GUSTS TO 60 MPH AND HEAVY RAIN THE PRIMARY THREAT. THE FRONT MAY STALL OUT OVER CENTRAL OR SOUTHERN IOWA OVERNIGHT... BRINGING REPEATED HEAVY RAINS TO THESE PORTIONS OF THE STATE. WITH THE RECENT HOT AND DRY WEATHER...FLOODING SHOULD NOT BE A CONCERN... THOUGH IF REPEATED HEAVY RAIN IS RECEIVED...SOME MINOR FLOODING COULD OCCUR. PRECAUTIONS -SPOTTERS MAY BE NEEDED OVER NORTHERN IOWA TODAY AND THE REST OF THE STATE TONIGHT. KEEP IN MIND THERE IS ALSO A HEAT ADVISORY OUT FOR ABOUT THE SOUTHERN HALF OF IOWA. IF YOU MUST BE OUTSIDE IN THESE AREAS...DRINK PLENTY OF WATER AND DON/T OVEREXERT YOURSELF. SEARCY
Special weather statement, Jul 21, 5:34 AM CDT, 2 hours 39 minutes before
IAZ004>007-015>017-023>028-035>039-047>050-061-062-075-086-220000- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 533 AM CDT MON JUL 20 1998 HAZARD--SCATTERED THUNDERSTORMS WITH WIND GUSTS TO 60 MPH AND HEAVY RAINFALL. AREA OF CONCERN AND TIMING DETAILS--NORTHEAST OF A SAC CITY TO MASON CITY LINE ANYTIME TODAY. SOUTHEAST OF THIS LINE THIS EVENING INTO THE OVERNIGHT HOURS. METEOROLOGICAL COMMENTS--A COLD FRONT LOCATED FROM NORTHEAST NEBRASKA THROUGH NORTHWEST IOWA INTO SOUTHEASTERN MINNESOTA WILL CONTINUE TO MOVE SOUTHEAST TODAY. MEANWHILE...LOW LEVEL SOUTHERLY WINDS WILL CONTINUE TO TRANSPORT MOISTURE NORTHWARD INTO AND OVER THE FRONT. SCATTERED THUNDERSTORMS OVER SOUTHEAST SOUTH DAKOTA WILL CONTINUE TO MOVE EAST THIS MORNING INTO NORTHERN IOWA. SOME OF THESE STORMS COULD PRODUCE WIND GUSTS TO 60 MPH THIS MORNING. ADDITIONAL ACTIVITY COULD REDEVELOP LATER THIS AFTERNOON OVER THE OUTLOOK AREA AS WELL. DUE TO WARM TEMPERATURES ALOFT...ANY HAIL THAT OCCURS SHOULD REMAIN BELOW SEVERE CRITERIA...OR LESS THAN THREE-QUARTERS OF AN INCH IN DIAMETER. AS THE FRONT CONTINUES SOUTHWARD LATER THIS EVENING... ADDITIONAL SHOWERS AND THUNDERSTORMS WILL OVERSPREAD THE REST OF THE STATE WITH WIND GUSTS TO 60 MPH AND HEAVY RAIN THE PRIMARY THREAT. THE FRONT MAY STALL OUT OVER CENTRAL OR SOUTHERN IOWA OVERNIGHT... BRINGING REPEATED HEAVY RAINS TO THESE PORTIONS OF THE STATE. WITH THE RECENT HOT AND DRY WEATHER...FLOODING SHOULD NOT BE A CONCERN... THOUGH IF REPEATED HEAVY RAIN IS RECEIVED...SOME MINOR FLOODING COULD OCCUR. PRECAUTIONS -SPOTTERS MAY BE NEEDED OVER NORTHERN IOWA TODAY AND THE REST OF THE STATE TONIGHT. KEEP IN MIND THERE IS ALJSO A HEAT ADVISORY OUT FOR ABOUT THE SOUTHERN HALF OF IOWA. IF YOU MUST BE OUTSIDE IN THESE AREAS...DRINK PLENTY OF WATER AND DON/T OVEREXERT YOURSELF. SEARCY
Special weather statement, Jul 21, 6:14 AM CDT, 1 hour 59 minutes before
IAZ004>007-015>017-023>028-035>039-047>050-061-062-075-086-220000- CENTRAL IOWA THUNDERSTORM OUTLOOK...UPDATED NATIONAL WEATHER SERVICE DES MOINES IA 614 AM CDT TUE JUL 21 1998 HAZARD--SCATTERED THUNDERSTORMS WITH WIND GUSTS TO 80 MPH AND HEAVY RAINFALL. UPDATED FOR...MINOR CHANGE TO AREA OF CONCERN... AREA OF CONCERN AND TIMING DETAILS--NORTH OF A SAC CITY TO ELDORA LINE ANYTIME TODAY. SOUTHEAST OF THIS LINE THIS EVENING INTO THE OVERNIGHT HOURS. METEOROLOGICAL COMMENTS--A COLD FRONT LOCATED FROM NORTHEAST NEBRASKA THROUGH NORTHWEST IOWA INTO SOUTHEASTERN MINNESOTA WILL CONTINUE TO MOVE SOUTHEAST TODAY. MEANWHILE...LOW LEVEL SOUTHERLY WINDS WILL CONTINUE TO TRANSPORT MOISTURE NORTHWARD INTO AND OVER THE FRONT. SCATTERED THUNDERSTORMS OVER SOUTHEAST SOUTH DAKOTA WILL CONTINUE TO MOVE EAST THIS MORNING INTO NORTHERN IOWA. SOME OF THESE STORMS COULD PRODUCE WIND GUSTS TO 80 MPH THIS MORNING. ADDITIONAL ACTIVITY COULD REDEVELOP LATER THIS AFTERNOON OVER THE OUTLOOK AREA AS WELL. DUE TO WARM TEMPERATURES ALOFT...ANY HAIL THAT OCCURS SHOULD REMAIN BELOW SEVERE CRITERIA...OR LESS THAN THREE-QUARTERS OF AN INCH IN DIAMETER. AS THE FRONT CONTINUES SOUTHWARD LATER THIS EVENING... ADDITIONAL SHOWERS AND THUNDERSTORMS WILL OVERSPREAD THE REST OF THE STATE WITH WIND GUSTS TO 60 MPH AND HEAVY RAIN THE PRIMARY THREAT. THE FRONT MAY STALL OUT OVER CENTRAL OR SOUTHERN IOWA OVERNIGHT... BRINGING REPEATED HEAVY RAINS TO THESE PORTIONS OF THE STATE. WITH THE RECENT HOT AND DRY WEATHER...FLOODING SHOULD NOT BE A CONCERN... THOUGH IF REPEATED HEAVY RAIN IS RECEIVED...SOME MINOR FLOODING COULD OCCUR. PRECAUTIONS -SPOTTERS MAY BE NEEDED OVER NORTHERN IOWA TODAY AND THE REST OF THE STATE TONIGHT. KEEP IN MIND THERE IS ALSO A HEAT ADVISORY OUT FOR ABOUT THE SOUTHERN HALF OF IOWA. IF YOU MUST BE OUTSIDE IN THESE AREAS...DRINK PLENTY OF WATER AND DON/T OVEREXERT YOURSELF. SEARCY
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 7:26 AM CDT | Severe Thunderstorm Warning | DMX | Palo Alto, Pocahontas | 34 min |
| Jul 21, 7:49 AM CDT | Severe Thunderstorm Warning | DMX | Emmet | 31 min |
| Jul 21, 8:00 AM CDT | Severe Thunderstorm Warning | DMX | Humboldt, Kossuth | 35 min |
| Jul 21, 8:13 AM CDT | Severe Thunderstorm Warning | DMX | Hancock, Winnebago | 32 min |
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; the sounding from the Mesonet's radiosonde archive.