Alert archive / Iowa / Tornado Warnings in 1997
Tornado Warning 7, NWS Des Moines, IA
NWS Des Moines, IA issued this tornado warning at Jun 21, 1997, 12:28 AM CDT for Black Hawk County, Iowa. It was in force for 32 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
- Jun 21, 1997, 12:28 AM CDT (05:28 UTC)
- Expired
- Jun 21, 1997, 1:00 AM CDT
- In force
- 32 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Black Hawk County, IA
The radar
The Des Moines radar (KDMX), 143 km from the middle of the area, began a volume at 05:28 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 |
|---|---|---|---|
| Jun 21, 12:39 AM CDT | Thunderstorm Wind 69 | Cedar Falls, IA | |
| Jun 21, 12:50 AM CDT | Thunderstorm Wind 65 | Waterloo, 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 |
|---|---|---|---|
| Jun 20, 11:45 PM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 5.5 hours before the alert went out and 177 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.
- Mixed-layer CAPE
- 4926 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 969 m above ground
- 0-6 km bulk shear
- 18 kt
- 0-1 km storm-relative helicity
- 67 m²/s²
- 0-3 km storm-relative helicity
- 216 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
154
WFUS1 KDSM 210527 RRA
TORDSM
IAC013-210600-
BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1228 AM CDT SAT JUN 21 1997
* TORNADO WARNING FOR
BLACK HAWK COUNTY - NORTHEASTERN IOWA
* UNTIL 100 AM CDT
* SOME AREAS AFFECTED
WATERLOO
HUDSON
VOORHIES
* AT 1225 AM CDT THE PUBLIC REPORTED A TORNADO 15 MILES SOUTHWEST OF
WATERLOO MOVING EAST AT 20 TO 25 MPH.
* THE STORM WILL BE NEAR VOORHIES BY 1235 AM CDT.
* THE TORNADO WILL LIKELY PASS JUST SOUTH OF WATERLOO.
IF YOU ARE NEAR THIS DANGEROUS STORM...TAKE COVER IMMEDIATELY IN THE
LOWEST FLOOR AND INNER MOST ROOM OF A BUILDING.
YOUR QUICK REACTION TO THIS TORNADO WARNING MAY SAVE YOUR LIFE. TAKE
COVER NOW
&The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 10:14 PM CDT | Severe Thunderstorm Warning | DMX | Wright | 31 min |
| Jun 20, 10:20 PM CDT | Severe Thunderstorm Warning | DMX | Webster | 35 min |
| Jun 20, 10:30 PM CDT | Severe Thunderstorm Warning | DMX | Franklin | 30 min |
| Jun 20, 11:01 PM CDT | Severe Thunderstorm Warning | DMX | Franklin | 34 min |
| Jun 20, 11:33 PM CDT | Severe Thunderstorm Warning | DMX | Hardin | 32 min |
| Jun 20, 11:39 PM CDT | Severe Thunderstorm Warning | DMX | Butler, Grundy | 31 min |
| Jun 21, 12:04 AM CDT | Severe Thunderstorm Warning | DMX | Grundy, Hardin | 31 min |
| Jun 21, 12:21 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Grundy | 44 min |
| Jun 21, 1:41 AM CDT | Severe Thunderstorm Warning | DMX | Audubon, Cass | 34 min |
| Jun 21, 2:39 AM CDT | Severe Thunderstorm Warning | DMX | Clarke, Warren | 31 min |
| Jun 21, 2:51 AM CDT | Severe Thunderstorm Warning | DMX | Polk, Warren | 34 min |
| Jun 21, 3:06 AM CDT | Severe Thunderstorm Warning | DMX | Lucas, Marion | 29 min |
| Jun 21, 3:21 AM CDT | Severe Thunderstorm Warning | DMX | Mahaska, Monroe | 34 min |
| Jun 21, 3:53 AM CDT | Severe Thunderstorm Warning | DMX | Wapello | 32 min |
| Jun 21, 4:27 PM CDT | Tornado Warning | DMX | Calhoun, Webster | 33 min |
Nearby
Tornado Warnings in Iowa, 1997Every tornado warning in 1997Tornadoes 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.