Alert archive / Iowa / Tornado Warnings in 1990

Tornado Warning 46, NWS Des Moines, IA

August 29, 1990Mahaska County, Wapello County, Iowa

NWS Des Moines, IA issued this tornado warning at Aug 29, 1990, 12:57 AM CDT for Mahaska County, Wapello County, Iowa. It was in force for 48 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: Aug 29, 1990, 12:57 AM CDT (05:57 UTC)
Expired: Aug 29, 1990, 1:45 AM CDT
In force: 48 min
Issued by: NWS Des Moines, IA
Area: Whole counties

Counties Mahaska County, IA, Wapello County, IA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

What was reported inside it

Time	Report	Where	Remark
Aug 29, 1:35 AM CDT	Hail 2	Wapello, 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. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 6.0 hours before the alert went out and 322 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: 3628 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 39 m²/s²
0-3 km storm-relative helicity: 223 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 KDSM 290559
TORDSM
IAC123-179-290645-
 
BULLETIN - EBS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
1257 AM CDT WED AUG 29 1990
 
THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A
TORNADO WARNING EFFECTIVE UNTIL  145 AM CDT
FOR PEOPLE IN THE FOLLOWING COUNTIES...
 
IN SOUTH CENTRAL IOWA
          ...EXTREME SOUTHERN MAHASKA
IN SOUTHEAST IOWA
          ...NORTHERN WAPELLO
 
AT 1255 AM...WEATHER RADAR INDICATED A TORNADO IN EXTREME SOUTHERN
MAHASKA COUNTY...JUST EAST OF EDDYVILLE...OR ABOUT 18 MILES NORTHWEST
OF OTTUMWA.
 
THE STORM WAS MOVING SOUTHEAST AT 25 MILES AN HOUR AND WILL AFFECT THE
COMMUNITIES OF EDDYVILLE...KIRKVILLE...CHILLICOTHE...HIGHLAND CENTER
AND THE OTTUMWA AREA.
 
IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING.  AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH
OR LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.
 
MYERS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 29, 12:04 AM CDT	Severe Thunderstorm Warning	DMX	Mahaska	26 min
Aug 29, 12:20 AM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Marion	40 min
Aug 29, 12:39 AM CDT	Severe Thunderstorm Warning	DMX	Wapello	51 min
Aug 29, 12:53 AM CDT	Severe Thunderstorm Warning	DMX	Jefferson	52 min
Aug 29, 1:11 AM CDT	Severe Thunderstorm Warning	DMX	Van Buren	49 min
Aug 29, 1:18 AM CDT	Tornado Warning	DMX	Wapello	42 min
Aug 29, 1:42 AM CDT	Tornado Warning	DMX	Davis, Van Buren	48 min
Aug 29, 1:37 PM CDT	Severe Thunderstorm Warning	DMX	Hardin	23 min
Aug 29, 5:00 PM CDT	Severe Thunderstorm Warning	DMX	Mahaska, Wapello	45 min
Aug 29, 5:13 PM CDT	Severe Thunderstorm Warning	DMX	Marion	47 min
Aug 29, 5:40 PM CDT	Severe Thunderstorm Warning	DMX	Adair, Guthrie	50 min

Nearby

Tornado Warnings in Iowa, 1990 Every tornado warning in 1990 Tornadoes in 1990

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.