Alert archive / Iowa / Flash Flood Warnings in 2002

Flash Flood Warning 5, NWS Des Moines, IA

June 12, 2002Marshall County, Iowa

NWS Des Moines, IA issued this flash flood warning at Jun 12, 2002, 7:19 PM CDT for Marshall 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 outline as issued.

The facts

Issued
Jun 12, 2002, 7:19 PM CDT (00:19 UTC)
Expired
Jun 12, 2002, 10:15 PM CDT
In force
3 hr
Issued by
NWS Des Moines, IA
Area
Counties, with a storm outline in the text

County Marshall County, IA

The radar

The Des Moines radar (KDMX), 63 km from the middle of the area, began a volume at 00:22 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

Davenport, (KDVN), launched 00:00Z, 0.3 hours before the alert went out and 217 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.

Skew-T log-pSkew-T log-p diagram, Davenport, at 00:00Z on 2002-06-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1544 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Davenport, at 00:00Z on 2002-06-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
1544 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
921 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
81 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS53 KDMX 130021
FFWDSM
IAC127-130315-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
719 PM CDT WED JUN 12 2002

THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  MARSHALL COUNTY IN CENTRAL IOWA

* UNTIL 1015 PM

* AT 717 PM...RADAR INDICATED THUNDERSTORMS WITH FLASH FLOOD         
  PRODUCING RAINS IN THE WARNING AREA.

* SLOW MOVING THUNDERSTORMS PRODUCING TORRENTIAL RAINFALL WILL       
  CONTINUE OVER THE NEXT TWO HOURS. RAINFALL RATES OF ONE TO TWO     
  INCHES IN 30 MINUTES ARE LIKELY. THIS WILL PRODUCE FLASH FLOODING  
  IN LOW LYING AREAS...AND IN URBAN AREAS OF MARSHALLTOWN.

OTHER WARNING LOCATIONS INCLUDE...
ALBION...CLEMONS...FERGUSON...HAVERHILL...LAUREL...LISCOMB...
MARSHALLTOWN...MELBOURNE...RHODES...ST. ANTHONY AND STATE CENTER

FLASH FLOODS OCCUR QUICKLY...MOVE TO HIGHER GROUND. NEVER DRIVE
THROUGH WATER OF UNKNOWN DEPTH...THE ROAD SURFACE MAY BE WASHED OUT.
LESS THAN ONE FOOT OF FAST FLOWING WATER CAN SWEEP AN AUTOMOBILE OFF
THE ROAD.

LAT...LON 4187 9325 4188 9279 4220 9278 4220 9324

KULA

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 12, 10:36 PM CDTSevere Thunderstorm WarningDMXPoweshiek24 min
Jun 12, 11:22 PM CDTSevere Thunderstorm WarningDMXWapello53 min
Jun 12, 11:23 PM CDTSevere Thunderstorm WarningDMXMadison, Warren67 min
Jun 12, 11:41 PM CDTSevere Thunderstorm WarningDMXDavis34 min
Jun 13, 1:29 AM CDTSevere Thunderstorm WarningDMXMonroe16 min

Nearby

Flash Flood Warnings in Iowa, 2002Every flash flood warning in 2002

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.