Alert archive / Iowa / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 13, NWS Des Moines, IA

May 7, 1997Carroll County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at May 7, 1997, 4:04 PM CDT for Carroll County, Iowa. It was in force for 31 min. 2 reports 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: May 7, 1997, 4:04 PM CDT (21:04 UTC)
Expired: May 7, 1997, 4:35 PM CDT
In force: 31 min
Issued by: NWS Des Moines, IA
Area: Whole counties

County Carroll County, IA

The radar

The Des Moines radar (KDMX), 100 km from the middle of the area, began a volume at 21:07 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.

What was reported inside it

Time	Report	Where	Remark
May 7, 4:09 PM CDT	Hail 0.75	Manning, IA
May 7, 4:15 PM CDT	Hail 0.75	Coon Rapids, IA

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
May 7, 2:00 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.1 hours before the alert went out and 148 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: 963 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 155 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KDSM 072104 RRA
SVRDSM
IAC027-072135-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
404 PM CDT WED MAY 7 1997

* SEVERE THUNDERSTORM WARNING FOR
  WESTERN CARROLL COUNTY - WEST CENTRAL IOWA

* UNTIL 435 PM CDT
 
* SOME AREAS AFFECTED
    MANNING
    ARCADIA
    CARROLL
    HALBUR

* AT 403 PM CDT RADAR INDICATED A SEVERE THUNDERSTORM 10 MILES
  SOUTHWEST OF CARROLL OR 70 MILES NORTHWEST OF DES MOINES MOVING EAST
  AT 25 MPH.

* THE STORM WILL BE NEAR HALBUR BY 410 PM TO NEAR CARROLL BY 420 PM.

THIS IS A DANGEROUS STORM.  DO NOT GO OUTDOORS.




FILLBACH

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 7, 10:16 AM CDT	Severe Thunderstorm Warning	DMX	Palo Alto, Pocahontas	44 min
May 7, 3:18 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	32 min
May 7, 3:48 PM CDT	Severe Thunderstorm Warning	DMX	Crawford	17 min
May 7, 4:29 PM CDT	Severe Thunderstorm Warning	DMX	Audubon	31 min
May 7, 4:47 PM CDT	Severe Thunderstorm Warning	DMX	Adams	33 min
May 7, 4:59 PM CDT	Severe Thunderstorm Warning	DMX	Audubon	36 min
May 7, 5:41 PM CDT	Severe Thunderstorm Warning	DMX	Marion, Warren	34 min
May 7, 5:52 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Guthrie	33 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.