Alert archive / Iowa / Flash Flood Warnings in 1998
Flash Flood Warning 11, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jun 18, 1998, 5:04 PM CDT for Polk County, Story County, Iowa. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jun 18, 1998, 5:04 PM CDT (22:04 UTC)
- Expired
- Jun 18, 1998, 7:05 PM CDT
- In force
- 2 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Polk County, IA, Story County, IA
The radar
The Des Moines radar (KDMX), 22 km from the middle of the area, began a volume at 22:04 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
Omaha, NE (KOAX), launched 12:00Z, 10.1 hours before the alert went out and 245 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
- 245 J/kg
- Mixed-layer CIN
- -251 J/kg
- Mixed-layer LCL
- 1451 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- -105 m²/s²
- 0-3 km storm-relative helicity
- -51 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -1.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 182204 FFWDSM IAC153-169-190005- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 504 PM CDT THU JUN 18 1998 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * FLASH FLOOD WARNING FOR... POLK COUNTY IN CENTRAL IOWA STORY COUNTY IN CENTRAL IOWA * UNTIL 705 PM CDT * AT BETWEEN 800 AM AND 300 PM CDT.... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAIN MOVED THROUGH POLK AND STORY COUNTIES. * STRONG THUNDERSTORMS THAT PRODUCE RAINFALL IN STORY AND POLK COUNTIES HAVE CAUSED WIDESPREAD URBAN FLOODING AS WELL AS CAUSING STREAMS TO OVERFLOW THEIR BANKS. SOME STREAMS AFFECTED INCLUDE... WALNUT CREEK FOUR MILE CREEK JORDAN CREEK DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD! FORSTER
What forecasters said that day
The local office's own words before this flash flood 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, 12:59 PM CDT, 4 hours 5 minutes before
IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-081>086- 092>097-190100- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 1259 PM CDT THU JUN 18 1998 HAZARD--SEVERE THUNDERSTORMS WITH DAMAGING WINDS ABOVE 60 MPH...HAIL 1 INCH OR LARGER AND HEAVY RAINS. URBAN AND SMALL STREAM FLOODING IS LIKELY WITH THE HEAVIEST STORMS. AREA OF CONCERN AND TIMING DETAILS-- EAST OF A POCAHONTAS--AUDUBON--BEDFORD LINE...OR VIRTUALLY ALL OF CENTRAL INTO EASTERN IOWA FROM NOW UNTIL 600 PM. METEOROLOGICAL COMMENTS--A COLD FRONT WAS APPROACHING A STORM LAKE-- AUDUBON--SHENANDOAH LINE AND WILL PUSH EAST THIS AFTERNOON. THE FIRST ROUND OF STORMS WHICH PRODUCED SEVERE WEATHER IN CENTRAL IOWA WAS AFFECTING AREAS OF NORTH CENTRAL IOWA NORTH OF WEBSTER CITY UP TOWARDS MASON CITY. NEWER DEVELOPMENT WAS TAKING PLACE RAPIDLY IN CENTRAL AND SOUTH CENTRAL IOWA FROM BOONE THROUGH CRESTON. OTHER STORMS MOVING INTO TAYLOR AND RINGGOLD COUNTIES FROM MISSOURI WILL MOVE NORTHEAST AT 50 MPH ALSO. ANY ONE OF THESE STORMS IS CAPABLE OF SEVERE WEATHER. PRECAUTIONS--EMERGENCY MANAGEMENT SHOULD PAY CLOSE ATTENTION TO SHORT TERM FORECASTS AND FURTHER WARNINGS. SPOTTER ACTIVATION WILL BE REQUIRED IN SEVERAL LOCATIONS. REPORT RAINFALL AMOUNTS TO THE NATIONAL WEATHER SERVICE IF AVAILABLE. A FLASH FLOOD WATCH IS ALSO IN EFFECT TODAY. KULA
Local storm report, Jun 18, 5:01 PM CDT, 3 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
501 PM 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 WINDS
1000 AM GOWRIE IA .75 INCH HAIL
06/18/98 WEBSTER
1004 AM 2 SE CALLENDER IA .75 INCH HAIL
06/18/98 WEBSTER
1015 AM 1 S FT DODGE IA .75 INCH HAIL
06/18/98 WEBSTER
1032 AM EARLHAM IA 1 INCH HAIL
06/18/98 MADISON
1043 AM 3 NW BOONE IA 1.75 INCH HAIL
06/18/98 BOONE
1052 AM MELCHER IA WIND DAMAGE
06/18/98 MARION LARGE TREE LIMBS DOWN
1055 AM 2 NE BOXHOLM IA .75 INCH HAIL
06/18/98 BOONE
1058 AM 2 SW DAYTON IA .75 INCH HAIL
06/18/98 WEBSTER
1102 AM ALTOONA IA WIND DAMAGE
06/18/98 POLK LARGE TREE LIMBS DOWN
1103 AM KNOXVILLE IA .75 INCH HAIL
06/18/98 MARION
1113 AM DES MOINES IA WIND DAMAGE
06/18/98 POLK ROOF TORN OFF HOUSE
1120 AM URBANDALE IA WIND DAMAGE
06/18/98 POLK LARGE TREE DOWN
1122 AM CARLISLE IA WIND DAMAGE
06/18/98 WARREN TREES AND POWER LINES DOWN
1124 AM ALTOONA IA WIND DAMAGE
06/18/98 POLK POWER LINES DOWN
1138 AM WEST DES MOINES IA WIND DAMAGE
06/18/98 POLK ROOF OFF BUILDING TREES
DOWN
1141 AM HUXLEY IA 75 MPH TSTM GUST
06/18/98 STORY TREES DOWN
1151 AM URBANDALE IA WIND DAMAGE
06/18/98 POLK 1 FOOT DIAMETER TREE DOWN
1155 AM BOONE IA 60 MPH TSTM GUST
06/18/98 BOONE
1158 AM MILO IA WIND DAMAGE
06/18/98 WARREN TREES AND POWER LINES DOWNThe 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, 12:55 PM CDT | Severe Thunderstorm Warning | DMX | Winnebago, Worth | 30 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 |
Nearby
Flash Flood Warnings in Iowa, 1998Every flash flood 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; radar from the NEXRAD Level II archive.