Alert archive / Iowa / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 103, NWS Quad Cities, IA

July 27, 1997Johnson County, Iowa

NWS Quad Cities, IA issued this severe thunderstorm warning at Jul 27, 1997, 3:36 PM CDT for Johnson County, Iowa. It was in force for 49 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: Jul 27, 1997, 3:36 PM CDT (20:36 UTC)
Expired: Jul 27, 1997, 4:25 PM CDT
In force: 49 min
Issued by: NWS Quad Cities, IA
Area: Whole counties

County Johnson County, IA

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.6 hours before the alert went out and 91 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 272037 RRA
SVRMLI
IAC103-272125-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
336 PM CDT SUN JUL 27 1997

* SEVERE THUNDERSTORM WARNING FOR
  JOHNSON COUNTY IN EAST CENTRAL IOWA

* UNTIL 425 PM CDT
 
* SOME LOCATIONS AFFECTED
  ELMIRA                             AROUND 340 PM CDT
  SUTIFF                             AROUND 340 PM CDT
  OASIS                              AROUND 340 PM CDT

* AT 333 PM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY QUAD
  CITIES IA DOPPLER RADAR 13 MILES NORTH OF IOWA CITY MOVING
  EAST AT 25 MPH.
 
STRONG GUSTY WINDS...DEADLY LIGHTNING...VERY HEAVY RAINFALL AND
LARGE HAIL MAY ACCOMPANY THIS STORM.

TEHP

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Quad Cities, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 27, 2:00 PM CDT, 1 hour 36 minutes earlier.

Area forecast discussion, Jul 27, 2:00 PM CDT, 1 hour 36 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
200 PM CDT SUN JUL 27 1997

SO FAR STORMS HAVE NOT POPPED SOUTH OF THE OUTFLOW/FRONT.  HOWEVER
STRONG/SVR STORM WITH RIGHT MOVEMNT&86 CELL BASED VIL APPROACHING
WESTERN PORTION OF CWA.  THIS STORM TRACKING ALONG BOUNDARY AND SO MAY
GET BUSY NEXT FEW HOURS.

MODELS ALL SHOW FRONT TO DROP SOUTH OF THE AREA WITH THE ETA IN A
BIGGER HURRY.  NGM AND AVN ARE SIMILAR AND SLOWER WITH FRONT KEEPING
SOME POPS INTO EARLY MONDAY MORNING I80 AND SOUTH.  BEST JET DYNAMICS
APROACH THE AREA LATE TONIGHT AND THERE4 THE BEST RAINS AFTER MIDNIGHT.

LIKELY POPS TONIGHT/POPS SOUTH OF I80 EARLY TOMORROW.  NEED MENTION OF
HVY RAIN OVERNIGHT.

CID 70/70   DBQ 66/70   MLI 71/70  BRL 73/70

HIRSCH

In the hours before

Local storm report, Jul 27, 3:29 PM CDT, 7 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
329 PM CDT SUN JUL 27 1997

TIME(CDT)  .....CITY LOCATION.....   ST   ...EVENT/REMARKS...
DATE(CDT)  ....COUNTY LOCATION....

0410 PM    5 NW TIPTON               IA   TORNADO
07/27/97   CEDAR                          FUNNEL CLOUD REPORTED BY
                                          LAW ENFORCEMENT

0320 PM    CEDAR RAPIDS              IA   LIGHTNING
07/27/97   LINN                           MAN SERIOUSLY INJURED WHEN
                                          LIGHTNING HIT NEARBY TREE

TEH

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, 3:43 PM CDT	Severe Thunderstorm Warning	DVN	Cedar	62 min
Jul 27, 4:02 PM CDT	Tornado Warning	DVN	Cedar	58 min
Jul 27, 4:16 PM CDT	Tornado Warning	DVN	Scott	64 min
Jul 27, 4:22 PM CDT	Tornado Warning	DVN	Clinton	63 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1997 Every severe thunderstorm 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.