Alert archive / Iowa / Flash Flood Warnings in 1998
Flash Flood Warning 14, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jun 20, 1998, 2:06 PM CDT for Winnebago County, Iowa. It was in force for 3 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 20, 1998, 2:06 PM CDT (19:06 UTC)
- Expired
- Jun 20, 1998, 5:05 PM CDT
- In force
- 3 hr
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Winnebago County, IA
The radar
The Minneapolis radar (KMPX), 164 km from the middle of the area, began a volume at 19:08 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 12:00Z, 7.1 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
- 18 J/kg
- Mixed-layer CIN
- -384 J/kg
- Mixed-layer LCL
- 2049 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 416 m²/s²
- 0-3 km storm-relative helicity
- 589 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KDSM 201907 FFWDSM IAC189-202205- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 206 PM CDT SAT JUN 20 1998 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A * FLASH FLOOD WARNING FOR... WINNEBAGO COUNTY IN NORTH CENTRAL IOWA * UNTIL 505 PM CDT * AT 200 PM CDT...RADAR INDICATED A THUNDERSTORM WITH VERY HEAVY RAIN NEAR LAKE MILLS WITH ANOTHER STORM SOUTH OF BUFFALO CENTER... MOVING NORTHEAST AT 30 MPH. * UPWARDS OF 3 INCHES OF RAIN HAS FALLEN OVER NORTHERN WINNEBAGO COUNTY WITH A SPOTTER NEAR SCARVILLE REPORTING 5 INCHES OF RAIN IN LESS THAN ONE HOUR. STREET FLOODING WAS REPORTED IN LAKE MILLS. SOME STREAMS AFFECTED INCLUDE... LIME CREEK...BUFFALO CREEK AND AREAS AROUND LAKE MILLS DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD! JUNGBLUTH
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 20, 11:52 AM CDT, 2 hours 14 minutes before
IAZ004-005-015-023-024-033>037-044>050-057>062-070>075-081>086- 092>097-202200- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 1152 AM CDT SAT JUN 20 1998 HAZARD--SCATTERED THUNDERSTORMS...SOME CAPABLE OF PRODUCING HAIL UP TO 2 INCHES IN DIAMETER...WINDS TO 80 MPH...AND RAINFALL AMOUNTS OF 1 TO 2 INCHES. AREA OF CONCERN AND TIMING DETAILS--THE ENTIRE FORECAST AREA WILL BE AFFECTED. THE THREAT WILL LIKELY NOON TO 500 PM WEST OF A LINE FROM MASON CITY TO ATLANTIC...AND FROM 500 PM UNTIL 1100 PM EAST OF THAT. METEOROLOGICAL COMMENTS--A DYNAMIC WEATHER SITUATION WILL DEVELOP FROM MID AFTERNOON INTO THE EVENING. THUNDERSTORMS SHOULD FORM A SOLID LINE ALONG A COLD FRONT AS IT SWEEPS ACROSS THE STATE BY SUNDAY MORNING. AT MIDDAY THE COLD FRONT HAD PUSHED INTO THE NORTHWEST COUNTIES OF IOWA WITH VERY WARM AND UNSTABLE AIR TO ITS EAST. DEW POINTS IN THE 70S ARE PRODUCING STRONG INSTABILITY ACROSS IOWA WITH CAPE VALUES IN EXCESS OF 5000 J/KG AND LIFTED INDICES AROUND MINUS 12 DEGREES C. ONLY A WARM LAYER OF AIR ALOFT AROUND 5000 FEET IS HOLDING BACK THE THUNDERSTORMS AT THIS TIME...BUT THE INSTABILITY WILL BE RELEASED AS THE COLD FRONT AND A MID-LEVEL JET STREAM MOVE THROUGH. TODAYS ENVIRONMENT IS MOST FAVORABLE FOR TORRENTIAL RAINS AND DAMAGING STRAIGHT LINE WINDS...ALTHOUGH A BRIEF TORNADO AND LARGE HAIL CANNOT BE RULED OUT DUE TO THE STRONG INSTABILITY. RAINFALL RATES WILL BE HIGH...BUT THE PROGRESSIVE MOVEMENT OF THE LINE SHOULD LIMIT MOST RAIN AMOUNTS TO THE 1 TO 2 INCH RANGE. PRECAUTIONS -PEOPLE WITH WEATHER SENSITIVE ACTIVITIES OR INTERESTS SHOULD KEEP WATCH FOR FURTHER UPDATES. THE WEATHER SITUATION COULD CHANGE QUICKLY LATER THIS AFTERNOON AND SEVERE WEATHER WATCHES ARE LIKELY ACROSS MUCH OF IOWA. SPOTTER ACTIVATION WILL LIKELY BE REQUIRED SO MONITOR SHORT TERM FORECASTS FOR TIMING INTO ANY SPECIFIC AREA. PROLONGED HEAVY RAINS ARE NOT EXPECTED...BUT DUE TO SATURATED GROUND AND HIGH WATER LEVELS...SMALL STREAM FLOODING AND PONDING OF WATER IS POSSIBLE. JUNGBLUTH
Special weather statement, Jun 20, 11:52 AM CDT, 2 hours 14 minutes before
IAZ004-005-015-023-024-033>037-044>050-057>062-070>075-081>086- 092>097-202200- CENTRAL IOWA THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE DES MOINES IA 1152 AM CDT SAT JUN 20 1998 HAZARD--SCATTERED THUNDERSTORMS...SOME CAPABLE OF PRODUCING HAIL UP TO 2 INCHES IN DIAMETER...WINDS TO 80 MPH...AND RAINFALL AMOUNTS OF 1 TO 2 INCHES. AREA OF CONCERN AND TIMING DETAILS--THE ENTIRE FORECAST AREA WILL BE AFFECTED. THE THREAT WILL LIKELY NOON TO 500 PM WEST OF A LINE FROM MASON CITY TO ATLANTIC...AND FROM 500 PM UNTIL 1100 PM EAST OF THAT. METEOROLOGICAL COMMENTS--A DYNAMIC WEATHER SITUATION WILL DEVELOP FROM MID AFTERNOON INTO THE EVENING. THUNDERSTORMS SHOULD FORM A SOLID LINE ALONG A COLD FRONT AS IT SWEEPS ACROSS THE STATE BY SUNDAY MORNING. AT MIDDAY THE COLD FRONT HAD PUSHED INTO THE NORTHWEST COUNTIES OF IOWA WITH VERY WARM AND UNSTABLE AIR TO ITS EAST. DEW POINTS IN THE 70S ARE PRODUCING STRONG INSTABILITY ACROSS IOWA WITH CAPE VALUES IN EXCESS OF 5000 J/KG AND LIFTED INDICES AROUND MINUS 12 DEGREES C. ONLY A WARM LAYER OF AIR ALOFT AROUND 5000 FEET IS HOLDING BACK THE THUNDERSTORMS AT THIS TIME...BUT THE INSTABILITY WILL BE RELEASED AS THE COLD FRONT AND A MID-LEVEL JET STREAM MOVE THROUGH. TODAYS ENVIRONMENT IS MOST FAVORABLE FOR TORRENTIAL RAINS AND DAMAGING STRAIGHT LINE WINDS...ALTHOUGH A BRIEF TORNADO AND LARGE HAIL CANNOT BE RULED OUT DUE TO THE STRONG INSTABILITY. RAINFALL RATES WILL BE HIGH...BUT THE PROGRESSIVE MOVEMENT OF THE LINE SHOULD LIMIT MOST RAIN AMOUNTS TO THE 1 TO 2 INCH RANGE. PRECAUTIONS -PEOPLE WITH WEATHER SENSITIVE ACTIVITIES OR INTERESTS SHOULD KEEP WATCH FOR FURTHER UPDATES. THE WEATHER SITUATION COULD CHANGE QUICKLY LATER THIS AFTERNOON AND SEVERE WEATHER WATCHES ARE LIKELY ACROSS MUCH OF IOWA. SPOTTER ACTIVATION WILL LIKELY BE REQUIRED SO MONITOR SHORT TERM FORECASTS FOR TIMING INTO ANY SPECIFIC AREA. PROLONGED HEAVY RAINS ARE NOT EXPECTED...BUT DUE TO SATURATED GROUND AND HIGH WATER LEVELS...SMALL STREAM FLOODING AND PONDING OF WATER IS POSSIBLE. JUNGBLUTH
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 2:48 PM CDT | Severe Thunderstorm Warning | DMX | Hancock | 32 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.