Alert archive / Iowa / Flash Flood Warnings in 1997

Flash Flood Warning 21, NWS Quad Cities, IA

June 29, 1997Dubuque County, Iowa

NWS Quad Cities, IA issued this flash flood warning at Jun 29, 1997, 2:43 PM CDT for Dubuque 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 29, 1997, 2:43 PM CDT (19:43 UTC)
Expired
Jun 29, 1997, 5:40 PM CDT
In force
3 hr
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Dubuque County, IA

The radar

The Quad Cities radar (KDVN), 99 km from the middle of the area, began a volume at 19:46 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 12:00Z, 7.7 hours before the alert went out and 100 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 12:00Z on 1997-06-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1673 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 12:00Z on 1997-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 square meters per square second.1939Sfc1 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
1673 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
773 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
79 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMLI 291944
FFWMLI
IAC061-292240-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
243 PM CDT SUN JUN 29 1997

* FLASH FLOOD WARNING FOR
  EASTERN DUBUQUE COUNTY - NORTHEASTERN IOWA

* UNTIL 540 PM CDT
 

* AT 240 PM CDT... QUAD CITIES IA DOPPLER RADAR INDICATED TRAINING
OF STRONG THUNDERSTORMS OVER THE EASTERN PART OF DUBUQUE COUNTY.
RADAR RAINFALL ESTIMATES SUGGESTED RAINFALL RATES OF OVER 2
INCHES PER HOUR HAVE ALREADY FALLEN. LAW ENFORCEMENT REPORTED
NUMEROUS REPORTS OF STREET FLOODING IN DOWNTOWN DUBUQUE.

* FORECAST CONDITIONS
ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE EXPECTED
THROUGH 4PM RESULTING IN ADDITIONAL FLOODING ON AREA STREAMS AND
SMALL RIVERS.

LEAVE FLOOD PRONE OR LOW LYING AREAS IMMEDIATELY.

&

PHILIP/BERG

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 29, 1:53 PM CDTSevere Thunderstorm WarningDVNDubuque32 min
Jun 29, 3:44 PM CDTFlash Flood WarningDVNDubuque3 hr
Jun 29, 4:38 PM CDTSevere Thunderstorm WarningDVNLinn62 min
Jun 29, 5:32 PM CDTFlash Flood WarningDVNLinn3 hr

Nearby

Flash Flood Warnings in Iowa, 1997Every flash flood warning in 1997

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.