Alert archive / Iowa / Flash Flood Warnings in 1998
Flash Flood Warning 23, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jun 24, 1998, 2:35 AM CDT for Sac County, Iowa. It was in force for 4 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 24, 1998, 2:35 AM CDT (07:35 UTC)
- Expired
- Jun 24, 1998, 6:30 AM CDT
- In force
- 4 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Sac County, IA
The radar
The Des Moines radar (KDMX), 135 km from the middle of the area, began a volume at 07:37 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
Minneapolis, MN (KMPX), launched 00:00Z, 7.6 hours before the alert went out and 300 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
- 901 J/kg
- Mixed-layer CIN
- -26 J/kg
- Mixed-layer LCL
- 1105 m above ground
- 0-6 km bulk shear
- 59 kt
- 0-1 km storm-relative helicity
- 212 m²/s²
- 0-3 km storm-relative helicity
- 335 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 8.6
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 240735 FFWDSM IAC161-241130- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 235 AM CDT WED JUN 24 1998 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * FLASH FLOOD WARNING FOR... SAC COUNTY IN WEST CENTRAL IOWA * UNTIL 630 AM CDT * AT 225 AM CDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORM ACTIVITY FROM EARLIER IN THE NIGHT HAD MOVED EAST OF THE AREA. * RAINFALL OF 3 TO 5 INCHES DURING THE LAST 6 HOURS OVER THE AREA HAVE CAUSED RISES ON MANY OF THE RIVERS AND STREAMS IN THE COUNTY. AT 230 AM...THE BOYER RIVER WAS REPORTED OUT OF ITS BANKS AND NUMEROUS BRIDGES HAVE WATER FLOWING OVER THEM. THIS WARNING EXTENDS THE FLASH FLOOD WARNING FOR SAC COUNTY FROM EARLIER IN THE NIGHT. SOME STREAMS AFFECTED INCLUDE... BOYER RIVER NORTHERN RACCOON CEDAR CREEK INDIAN CREEK DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD! FILLBACH
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 24, 12:51 AM CDT, 1 hour 44 minutes before
IAZ004>007-015>017-023>026-033>037-044>049-240630- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 1251 AM CDT WED JUN 24 1998 TORNADO WATCH 649 HAS BEEN ALLOWED TO EXPIRE FOR NORTHWEST AND NORTH CENTRAL IOWA. THE STRONGEST STORMS HAVE MOVED OFF TO THE EAST. A FLASH FLOOD WATCH REMAINS IN EFFECT FOR PORTIONS OF WESTERN... CENTRAL AND NORTHERN IOWA OVERNIGHT. A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT FOR SOUTHWEST AND SOUTH CENTRAL IOWA UNTIL 5 AM AND A SEVERE THUNDERSTORM WATCH IS ALSO IN EFFECT FOR EASTERN IOWA UNTIL 6 AM. STARK
Local storm report, Jun 24, 1:33 AM CDT, 1 hour 2 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
133 AM CDT WED JUN 24 1998
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....COUNTY LOCATION....
0919 PM 4 N ODEBOLT IA 1.25 INCH HAIL
06/23/98 SAC WALNUT SIZE HAIL
1000 PM 5 N ALGONA IA 1.25 INCH HAIL
06/23/98 KOSSUTH FROM FIRE DEPT SPOTTER
1006 PM 1 S SAC CITY IA WIND DAMAGE
06/23/98 SAC DAMAGE TO HOUSE JUST SOUTH
OF TOWN NEAR HIGHWAY 20
1006 PM SAC CITY IA WIND DAMAGE
06/23/98 SAC TREE DAMAGE JUST SOUTH OF
SAC CITY
1013 PM ROCKWELL CITY IA WIND DAMAGE
06/23/98 CALHOUN TREES DOWN
1030 PM HUMBOLDT IA WIND DAMAGE
06/23/98 HUMBOLDT GRAIN BIN DAMAGED
1030 PM MANSON IA WIND DAMAGE
06/23/98 CALHOUN GRAIN DRIER DAMAGED
1038 PM PALMER IA WIND DAMAGE
06/23/98 POCAHONTAS BUILDING DAMAGED
1052 PM FT DODGE IA WIND DAMAGE
06/23/98 WEBSTER WINDOWS BLOWN OUT AT MALL
DEPARTMENT STORE
1133 PM THORNTON IA 70 MPH TSTM GUST
06/23/98 CERRO GORDO
1150 PM CLEAR LAKE IA WIND DAMAGE
06/23/98 CERRO GORDO LARGE TREE LIMBS DOWN.
ROOF BLOWN OFF HOUSE.
1213 AM ROCKWELL CITY IA FLOODING
06/24/98 CALHOUN KNEE DEEP WATER IN MUCH OF
TOWN
0120 AM WATERLOO IA WIND DAMAGE
06/24/98 BLACK HAWK LARGE TREES DOWN
SMALLThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 23, 8:59 PM CDT | Severe Thunderstorm Warning | DMX | Sac | 46 min |
| Jun 23, 9:25 PM CDT | Severe Thunderstorm Warning | DMX | Crawford | 30 min |
| Jun 23, 9:47 PM CDT | Tornado Warning | DMX | Sac | 33 min |
| Jun 23, 9:52 PM CDT | Tornado Warning | DMX | Calhoun | 33 min |
| Jun 23, 10:08 PM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Carroll | 47 min |
| Jun 23, 10:17 PM CDT | Severe Thunderstorm Warning | DMX | Webster | 33 min |
| Jun 23, 10:19 PM CDT | Flash Flood Warning | DMX | Palo Alto | 3 hr |
| Jun 23, 10:38 PM CDT | Severe Thunderstorm Warning | DMX | Humboldt | 32 min |
| Jun 23, 10:41 PM CDT | Flash Flood Warning | DMX | Kossuth | 4 hr |
| Jun 23, 10:41 PM CDT | Flash Flood Warning | DMX | Sac | 4 hr |
| Jun 23, 10:54 PM CDT | Flash Flood Warning | DMX | Pocahontas | 4 hr |
| Jun 23, 11:20 PM CDT | Flash Flood Warning | DMX | Crawford | 4 hr |
| Jun 23, 11:31 PM CDT | Flash Flood Warning | DMX | Winnebago | 4 hr |
| Jun 23, 11:34 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Franklin, Worth | 31 min |
| Jun 23, 11:53 PM CDT | Flash Flood Warning | DMX | Calhoun | 4 hr |
| Jun 23, 11:56 PM CDT | Severe Thunderstorm Warning | DMX | Butler | 34 min |
| Jun 24, 12:34 AM CDT | Flash Flood Warning | DMX | Hamilton, Webster | 4 hr |
| Jun 24, 2:50 AM CDT | Flash Flood Warning | DMX | Crawford | 4 hr |
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.