Alert archive / Illinois / Tornado Warnings in 1997

Tornado Warning 10, NWS Quad Cities, IA

April 30, 1997Clinton County, Iowa; Carroll County, Whiteside County, Illinois

NWS Quad Cities, IA issued this tornado warning at Apr 30, 1997, 4:46 PM CDT for Clinton County, Iowa; Carroll County, Whiteside County, Illinois. It was in force for 34 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, 4:46 PM CDT (21:46 UTC)
Expired: Apr 30, 1997, 5:20 PM CDT
In force: 34 min
Issued by: NWS Quad Cities, IA
Area: Whole counties

Counties Clinton County, IA, Carroll County, IL, Whiteside County, IL

The radar

The Quad Cities radar (KDVN), 50 km from the middle of the area, began a volume at 21:49 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.

Issued	Product	Office	Lasted
Apr 30, 12:30 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.8 hours before the alert went out and 45 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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.

000 
TTAA00 KMLI 302147 RRA
TORMLI
IAC045-ILC015-195-302220-

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

* TORNADO WARNING FOR
  EASTERN CLINTON COUNTY - EAST CENTRAL IOWA
  CARROLL COUNTY - NORTHWESTERN ILLINOIS
  NORTHERN WHITESIDE COUNTY - NORTHWESTERN ILLINOIS

* UNTIL 520 PM CDT
 
* SOME LOCATIONS AFFECTED

  CLINTON
  EAST CLINTON
  THOMSON
  FAIR HAVEN

* AT 445 PM CDT SPOTTERS REPORTED A TORNADO NEAR CLINTON AIRPORT
  MOVING NORTHEAST AT 40 MPH.

* THE STORM WILL BE 5 MILES NORTH OF CLINTON BY 455 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.

Issued	Product	Office	Counties	Lasted
Apr 30, 1:51 PM CDT	Severe Thunderstorm Warning	DVN	Cedar	34 min
Apr 30, 2:26 PM CDT	Severe Thunderstorm Warning	DVN	Clinton, Jackson, Jones	49 min
Apr 30, 3:16 PM CDT	Tornado Warning	DVN	Cedar, Clinton	34 min
Apr 30, 3:20 PM CDT	Tornado Warning	DVN	Scott	50 min
Apr 30, 3:23 PM CDT	Tornado Warning	DVN	Muscatine	47 min
Apr 30, 3:45 PM CDT	Tornado Warning	DVN	Clinton	50 min
Apr 30, 4:08 PM CDT	Tornado Warning	DVN	Jackson	47 min
Apr 30, 1:36 PM CDT	Severe Thunderstorm Warning	DVN	Hancock	34 min
Apr 30, 1:41 PM CDT	Tornado Warning	DVN	Hancock	34 min
Apr 30, 2:06 PM CDT	Tornado Warning	DVN	McDonough	34 min
Apr 30, 2:22 PM CDT	Tornado Warning	DVN	Warren	48 min
Apr 30, 3:30 PM CDT	Tornado Warning	DVN	Henry	50 min
Apr 30, 4:58 PM CDT	Tornado Warning	DVN	Jo Daviess	32 min

Nearby

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