Alert archive / Iowa / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 185, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 18, 1998, 12:55 PM CDT for Winnebago County, Worth County, Iowa. It was in force for 30 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
- Jun 18, 1998, 12:55 PM CDT (17:55 UTC)
- Expired
- Jun 18, 1998, 1:25 PM CDT
- In force
- 30 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Winnebago County, IA, Worth County, IA
The radar
The Minneapolis radar (KMPX), 164 km from the middle of the area, began a volume at 17:54 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 |
|---|---|---|---|
| Jun 18, 1:24 PM CDT | Thunderstorm Wind 50 | Hanlontown, 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
Minneapolis, MN (KMPX), launched 12:00Z, 5.9 hours before the alert went out and 164 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
- 430 J/kg
- Mixed-layer CIN
- -72 J/kg
- Mixed-layer LCL
- 666 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- -22 m²/s²
- 0-3 km storm-relative helicity
- -35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
828 WUUS1 KDSM 181755 RRA SVRDSM IAC189-195-181825- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE DES MOINES IA 1255 PM CDT THU JUN 18 1998 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... WINNEBAGO COUNTY IN NORTH CENTRAL IOWA WORTH COUNTY IN NORTH CENTRAL IOWA * UNTIL 125 PM CDT * AT 1252 PM CDT... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 12 MILES NORTHWEST OF MASON CITY OR 7 MILES SOUTH SOUTHEAST OF JOICE MOVING NORTH NORTHEAST AT 45 MPH. * THIS STORM CAN BE EXPECTED NEAR... FOREST CITY NOW KENSETT BY 1258 PM CDT GRAFTON BY 101 PM CDT NORTHWOOD BY 105 PM CDT LAKE MILLS BY 105 PM CDT THIS STORM HAS A HISTORY OF DAMAGING WIND. GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS FILLBACH
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 18, 9:31 AM CDT, 3 hours 24 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-182200- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 931 AM CDT THU JUN 18 1998 HAZARD--SEVERE THUNDERSTORMS WITH HAIL 1 INCH OR LARGER... HEAVY RAINS AND DAMAGING WINDS. AN ISOLATED TORNADO IS ALSO POSSIBLE. AREA OF CONCERN AND TIMING DETAILS-- THROUGH NOON--ALONG AND EAST OF A FORT DODGE-ATLANTIC LINE. NOON TO 800 PM--MAINLY SOUTHEAST OF A FORT DODGE--CRESTON LINE. METEOROLOGICAL COMMENTS--A COLD FRONT WILL BE THE FOCUS OF THUNDERSTORM DEVELOPMENT THROUGH THE DAY. AT 900 AM...THE FRONT WAS LOCATED FROM NEAR SIOUX CITY TO JUST SOUTH OF OMAHA INTO SOUTH CENTRAL KANSAS. A WARM FRONT LOCATED NEAR I-80 WILL ALSO MOVE NORTH TODAY PROVIDING ANOTHER FOCUS FOR CONVERGENCE. WARM...UNSTABLE AND VERY MOIST AIR SOUTH OF THIS FRONT AND IS EXPECTED TO PROVIDE PLENTY OF BUOYANCY FOR STRONG UPDRAFTS FOR SEVERE THUNDERSTORMS TODAY. A 100 KNOT SOUTHWESTERLY JET STREAM WILL BE PUSHING NORTHEAST FROM THE TEXAS PANHANDLE TODAY INTERSECTING 40 KNOT SOUTHERLY FLOW IN THE LOWEST 5000 FEET. THIS WILL CREATE FAVORABLE SHEAR FOR THE MAINTENANCE OF ROTATING UPDRAFTS AND SEVERE STORMS. ISOLATED SUPERCELLS ARE POSSIBLE...BUT AT THIS TIME A SQUALL LINE IS EXPECTED TO FORM EVENTUALLY ALONG THE COLD FRONT THIS AFTERNOON...SPREADING EASTWARD TOWARD EVENING. PRECAUTIONS--EMERGENCY MANAGEMENT SHOULD PAY CLOSE ATTENTION TO SHORT TERM FORECASTS AND FURTHER STATEMENTS TODAY. SEVERE WEATHER WATCHES MAY BE ISSUED LATER THIS MORNING OR EARLY AFTERNOON. SPOTTER ACTIVATION WILL BE REQUIRED IN SEVERAL LOCATIONS. REPORT RAINFALL AMOUNTS TO THE NATIONAL WEATHER SERVICE IF AVAILABLE. A FLASH FLOOD WATCH IS IN EFFECT TODAY. KULA
Special weather statement, Jun 18, 9:31 AM CDT, 3 hours 24 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-182200- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 931 AM CDT THU JUN 18 1998 HAZARD--SEVERE THUNDERSTORMS WITH HAIL 1 INCH OR LARGER... HEAVY RAINS AND DAMAGING WINDS. AN ISOLATED TORNADO IS ALSO POSSIBLE. AREA OF CONCERN AND TIMING DETAILS-- THROUGH NOON--ALONG AND EAST OF A FORT DODGE-ATLANTIC LINE. NOON TO 800 PM--MAINLY SOUTHEAST OF A FORT DODGE--CRESTON LINE. METEOROLOGICAL COMMENTS--A COLD FRONT WILL BE THE FOCUS OF THUNDERSTORM DEVELOPMENT THROUGH THE DAY. AT 900 AM...THE FRONT WAS LOCATED FROM NEAR SIOUX CITY TO JUST SOUTH OF OMAHA INTO SOUTH CENTRAL KANSAS. A WARM FRONT LOCATED NEAR I-80 WILL ALSO MOVE NORTH TODAY PROVIDING ANOTHER FOCUS FOR CONVERGENCE. WARM...UNSTABLE AND VERY MOIST AIR SOUTH OF THIS FRONT AND IS EXPECTED TO PROVIDE PLENTY OF BUOYANCY FOR STRONG UPDRAFTS FOR SEVERE THUNDERSTORMS TODAY. A 100 KNOT SOUTHWESTERLY JET STREAM WILL BE PUSHING NORTHEAST FROM THE TEXAS PANHANDLE TODAY INTERSECTING 40 KNOT SOUTHERLY FLOW IN THE LOWEST 5000 FEET. THIS WILL CREATE FAVORABLE SHEAR FOR THE MAINTENANCE OF ROTATING UPDRAFTS AND SEVERE STORMS. ISOLATED SUPERCELLS ARE POSSIBLE...BUT AT THIS TIME A SQUALL LINE IS EXPECTED TO FORM EVENTUALLY ALONG THE COLD FRONT THIS AFTERNOON...SPREADING EASTWARD TOWARD EVENING. PRECAUTIONS--EMERGENCY MANAGEMENT SHOULD PAY CLOSE ATTENTION TO SHORT TERM FORECASTS AND FURTHER STATEMENTS TODAY. SEVERE WEATHER WATCHES MAY BE ISSUED LATER THIS MORNING OR EARLY AFTERNOON. SPOTTER ACTIVATION WILL BE REQUIRED IN SEVERAL LOCATIONS. REPORT RAINFALL AMOUNTS TO THE NATIONAL WEATHER SERVICE IF AVAILABLE. A FLASH FLOOD WATCH IS IN EFFECT TODAY. KULA
Local storm report, Jun 18, 9:57 AM CDT, 2 hours 58 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
957 AM CDT THU JUN 18 1998
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0800 AM CORYDON IA WIND DAMAGE
06/18/98 WAYNE UTILITY POLES AND TREES
DOWN, STRONG WINDSThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 18, 3:35 AM CDT | Severe Thunderstorm Warning | DMX | Emmet | 30 min |
| Jun 18, 9:12 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Cass, Guthrie | 33 min |
| Jun 18, 10:05 AM CDT | Severe Thunderstorm Warning | DMX | Webster | 35 min |
| Jun 18, 10:41 AM CDT | Severe Thunderstorm Warning | DMX | Marion | 34 min |
| Jun 18, 10:45 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Webster | 35 min |
| Jun 18, 10:54 AM CDT | Severe Thunderstorm Warning | DMX | Polk | 31 min |
| Jun 18, 11:06 AM CDT | Severe Thunderstorm Warning | DMX | Jasper | 34 min |
| Jun 18, 11:12 AM CDT | Severe Thunderstorm Warning | DMX | Warren | 33 min |
| Jun 18, 11:15 AM CDT | Severe Thunderstorm Warning | DMX | Marshall, Story | 35 min |
| Jun 18, 11:21 AM CDT | Severe Thunderstorm Warning | DMX | Marion | 34 min |
| Jun 18, 11:22 AM CDT | Severe Thunderstorm Warning | DMX | Polk | 33 min |
| Jun 18, 11:36 AM CDT | Severe Thunderstorm Warning | DMX | Jasper | 34 min |
| Jun 18, 11:40 AM CDT | Severe Thunderstorm Warning | DMX | Boone | 35 min |
| Jun 18, 11:43 AM CDT | Severe Thunderstorm Warning | DMX | Hardin | 32 min |
| Jun 18, 11:50 AM CDT | Severe Thunderstorm Warning | DMX | Marshall, Story | 30 min |
| Jun 18, 12:01 PM CDT | Severe Thunderstorm Warning | DMX | Hamilton, Webster | 34 min |
| Jun 18, 1:30 PM CDT | Severe Thunderstorm Warning | DMX | Dallas, Polk | 35 min |
| Jun 18, 1:33 PM CDT | Severe Thunderstorm Warning | DMX | Union | 32 min |
| Jun 18, 1:56 PM CDT | Tornado Warning | DMX | Warren | 34 min |
| Jun 18, 1:59 PM CDT | Flash Flood Warning | DMX | Dallas | 3 hr |
| Jun 18, 2:09 PM CDT | Severe Thunderstorm Warning | DMX | Polk | 31 min |
| Jun 18, 2:16 PM CDT | Flash Flood Warning | DMX | Polk | 3 hr |
| Jun 18, 2:16 PM CDT | Tornado Warning | DMX | Polk | 34 min |
| Jun 18, 2:19 PM CDT | Flash Flood Warning | DMX | Story | 3 hr |
| Jun 18, 2:35 PM CDT | Flash Flood Warning | DMX | Madison | 3 hr |
| Jun 18, 3:03 PM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Marion | 32 min |
| Jun 18, 3:12 PM CDT | Severe Thunderstorm Warning | DMX | Poweshiek | 28 min |
| Jun 18, 3:16 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Tama | 34 min |
| Jun 18, 3:34 PM CDT | Severe Thunderstorm Warning | DMX | Davis, Wapello | 31 min |
| Jun 18, 5:04 PM CDT | Flash Flood Warning | DMX | Polk, Story | 2 hr |
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; radar from the NEXRAD Level II archive.