Alert archive / Iowa / Tornado Warnings in 1997

Tornado Warning 41, NWS Quad Cities, IA

July 27, 1997Scott County, Iowa

NWS Quad Cities, IA issued this tornado warning at Jul 27, 1997, 4:16 PM CDT for Scott County, Iowa. It was in force for 64 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jul 27, 1997, 4:16 PM CDT (21:16 UTC)
Expired: Jul 27, 1997, 5:20 PM CDT
In force: 64 min
Issued by: NWS Quad Cities, IA
Area: Whole counties

County Scott County, IA

What was reported inside it

Time	Report	Where	Remark
Jul 27, 4:25 PM CDT	Thunderstorm Wind 50	Davenport, IA	Large tree limb crashed down onto a mobile home.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The watch it was issued in

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

Issued	Product	Office	Lasted
Jul 27, 4:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.3 hours before the alert went out and 10 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: 2407 J/kg
Mixed-layer CIN: -105 J/kg
Mixed-layer LCL: 1367 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 41 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 272117 RRA
TORMLI
IAC163-272220-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
416 PM CDT SUN JUL 27 1997

* TORNADO WARNING FOR
  SCOTT COUNTY IN EAST CENTRAL IOWA

* UNTIL 520 PM CDT
 
* SOME LOCATIONS AFFECTED
  NEW LIBERTY                        AROUND 440 PM CDT
  BIG ROCK                           AROUND 440 PM CDT
  DIXON                              AROUND 450 PM CDT
  NEW DIXON                          AROUND 450 PM CDT
  PLAINVIEW                          AROUND 455 PM CDT

* AT 414 PM CDT...A DEVELOPING TORNADO WAS INDICATED BY QUAD CITIES
  IA DOPPLER RADAR 21 MILES EAST OF IOWA CITY OR 13 MILES WEST OF
  NEW LIBERTY MOVING EAST AT 25 MPH.
 
THIS IS A DANGEROUS STORM. ACT QUICKLY. GO TO A SHELTER BELOW
GROUND IF AVAILABLE. OTHERWISE GO TO AN INTERIOR ROOM ON THE
LOWEST FLOOR. AVOID WINDOWS. ABANDON CARS AND MOBILE HOMES...TAKE
COVER IN A REINFORCED BUILDING OR GET INTO A DITCH OR CULVERT.

TEH/PAB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 27, 3:23 PM CDT	Severe Thunderstorm Warning	DVN	Iowa	62 min
Jul 27, 3:36 PM CDT	Severe Thunderstorm Warning	DVN	Johnson	49 min
Jul 27, 3:43 PM CDT	Severe Thunderstorm Warning	DVN	Cedar	62 min
Jul 27, 4:02 PM CDT	Tornado Warning	DVN	Cedar	58 min
Jul 27, 4:22 PM CDT	Tornado Warning	DVN	Clinton	63 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.