Alert archive / Iowa / Tornado Warnings in 1997

Tornado Warning 45, NWS Quad Cities, IA

August 16, 1997Jackson County, Jones County, Iowa

NWS Quad Cities, IA issued this tornado warning at Aug 16, 1997, 5:27 PM CDT for Jackson County, Jones County, Iowa. It was in force for 63 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: Aug 16, 1997, 5:27 PM CDT (22:27 UTC)
Expired: Aug 16, 1997, 6:30 PM CDT
In force: 63 min
Issued by: NWS Quad Cities, IA
Area: Whole counties

Counties Jackson County, IA, Jones County, IA

The radar

The Quad Cities radar (KDVN), 64 km from the middle of the area, began a volume at 22:29 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
Aug 16, 5:15 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 10.5 hours before the alert went out and 65 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: 3426 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 756 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 151 m²/s²
0-3 km storm-relative helicity: 155 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KMLI 162227 RRA
TORMLI
IAC097-105-162330-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
527 PM CDT SAT AUG 16 1997

* TORNADO WARNING FOR
  JACKSON COUNTY IN EAST CENTRAL IOWA
  EASTERN JONES COUNTY IN EAST CENTRAL IOWA

* UNTIL 630 PM CDT
 
* SOME LOCATIONS AFFECTED
  CRABTOWN                           AROUND 530 PM CDT
  SOUTH GARRY OWEN                   AROUND 530 PM CDT
  NASHVILLE                          AROUND 530 PM CDT
  IRONHILLS                          AROUND 530 PM CDT
  MAQUOKETA                          AROUND 545 PM CDT

* AT 525 PM CDT...A DEVELOPING TORNADO WAS INDICATED BY QUAD CITIES
  IA DOPPLER RADAR AND SPOTTER REPORTS 26 MILES SOUTHWEST OF DUBUQUE
  OR 4 MILES SOUTHWEST OF CRABTOWN MOVING EAST AT 25 MPH.
 
A TORNADO WAS REPORTED ON THE GROUND WITH THIS STORM NEAR ONSLOW AT
525 PM.

IF YOU ARE IN THE PATH OF A TORNADO...THE SAFEST PLACE TO BE IS
IN A BASEMENT. GET UNDER A WOR,KBENCH OR PIECE OF STURDY
FURNITURE. IF NO BASEMENT IS AVAILABLE...FIND SHELTER IN AN
INTERIOR ROOM SUCH AS A CLOSET ON THE LOWEST FLOOR. USE
BLANKETS...PILLOWS...OR CUSHIONS TO COVER YOUR BODY. AVOID
WINDOWS.

TEH/BLH

&

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 5:05 PM CDT	Severe Thunderstorm Warning	DVN	Jackson	60 min
Aug 16, 5:14 PM CDT	Severe Thunderstorm Warning	DVN	Jones	46 min
Aug 16, 6:53 PM CDT	Tornado Warning	DVN	Clinton, Scott	62 min

Nearby

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.