Alert archive / Iowa / Tornado Warnings in 1997

Tornado Warning 6, NWS Quad Cities, IA

April 30, 1997Muscatine County, Iowa

NWS Quad Cities, IA issued this tornado warning at Apr 30, 1997, 3:23 PM CDT for Muscatine County, Iowa. It was in force for 47 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Apr 30, 1997, 3:23 PM CDT (20:23 UTC)
Expired
Apr 30, 1997, 4:10 PM CDT
In force
47 min
Issued by
NWS Quad Cities, IA
Area
Whole counties

County Muscatine County, IA

The radar

The Quad Cities radar (KDVN), 47 km from the middle of the area, began a volume at 20:24 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 30, 12:30 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.4 hours before the alert went out and 53 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 1997-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 1997-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 75 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1366 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
75 m²/s²
0-3 km storm-relative helicity
180 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.

042 
WFUS1 KMLI 302024 RRA
TORMLI
IAC139-302110-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
323 PM CDT WED APR 30 1997

* TORNADO WARNING FOR
  EASTERN MUSCATINE COUNTY - EAST CENTRAL IOWA

* UNTIL 410 PM CDT
 
* SOME LOCATIONS AFFECTED

  MUSCATINE
  FAIRPORT
  SWEETLAND CENTER

* AT 324 PM CDT LOCAL LAW ENFORCEMENT REPORTED A TORNADO 5 MILES
  NORTH OF MUSCATINE MOVING EAST NORTHEAST AT 40 MPH.

* THE STORM WILL BE NEAR FAIRPORT BY 335 PM CDT.

IF YOU ARE NEAR THIS DANGEROUS STORM, TAKE COVER IMMEDIATELY IN THE
LOWEST FLOOR AND INNERMOST ROOM OF A BUILDING.

MEYER

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 30, 1:51 PM CDTSevere Thunderstorm WarningDVNCedar34 min
Apr 30, 2:26 PM CDTSevere Thunderstorm WarningDVNClinton, Jackson, Jones49 min
Apr 30, 3:16 PM CDTTornado WarningDVNCedar, Clinton34 min
Apr 30, 3:20 PM CDTTornado WarningDVNScott50 min
Apr 30, 3:45 PM CDTTornado WarningDVNClinton50 min
Apr 30, 4:08 PM CDTTornado WarningDVNJackson47 min
Apr 30, 4:46 PM CDTTornado WarningDVNClinton34 min

Nearby

Tornado Warnings in Iowa, 1997Every tornado warning in 1997Tornadoes 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.