Alert archive / Iowa / Tornado Warnings in 2001

Tornado Warning 73, NWS Omaha, NE

August 17, 2001Harrison County, Monona County, Iowa

NWS Omaha, NE issued this tornado warning at Aug 17, 2001, 8:14 PM CDT for Harrison County, Monona County, Iowa. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Aug 17, 2001, 8:14 PM CDT (01:14 UTC)
Expired: Aug 17, 2001, 8:45 PM CDT
In force: 31 min
Issued by: NWS Omaha, NE
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Harrison County, IA, Monona County, IA

The watch it was issued in

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

Issued	Product	Office	Lasted
Aug 17, 5:30 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 1.2 hours before the alert went out and 69 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: 2452 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 1134 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 66 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 3.9

Open this sounding in Storm Lab

The text

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

655 
WFUS53 KOAX 180116
TOROMA
IAC085-133-180145-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OMAHA NE
814 PM CDT FRI AUG 17 2001

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN HARRISON COUNTY IN SOUTHWEST IOWA
  SOUTHERN MONONA COUNTY IN WEST CENTRAL IOWA

* UNTIL 845 PM CDT

* AT 810 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  TORNADO 5 MILES SOUTHEAST OF BLENCOE...OR ABOUT 44 MILES NORTH     
  OF OMAHA...MOVING SOUTHEAST AT 25 MPH.  ANOTHER POSSIBLE TORNADO
  WAS AROUND 6 MILES SOUTH OF SOLDIER...MOVING SOUTHEAST AROUND 20
  MPH.  

* THE TORNADO IS EXPECTED TO BE NEAR...
  PISGAH...LITTLE SIOUX AROUND 820 PM CDT
  WOODBINE AROUND 845 PM CDT

IF YOU ARE IN THE PATH OF A TORNADO...GO TO A BASEMENT. IF A BASEMENT
IS NOT AVAILABLE...TAKE COVER IN AN INTERIOR ROOM ON THE LOWEST LEVEL
OF YOUR HOME OR BUSINESS. AVOID WINDOWS.

TAKE COVER NOW IN A BASEMENT OR AN INTERIOR ROOM. IN ADDITION TO THE
TORNADO THREAT...LARGE HAIL AND DAMAGING WIND ARE EXPECTED.

LAT...LON 4191 9615 4169 9600 4170 9559 4199 9571

POLLACK

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 17, 7:14 PM CDT	Severe Thunderstorm Warning	OAX	Monona	31 min
Aug 17, 7:47 PM CDT	Severe Thunderstorm Warning	OAX	Monona	28 min
Aug 17, 7:51 PM CDT	Tornado Warning	OAX	Monona	24 min
Aug 17, 8:14 PM CDT	Severe Thunderstorm Warning	OAX	Shelby	31 min
Aug 17, 8:23 PM CDT	Tornado Warning	OAX	Shelby	37 min
Aug 17, 8:45 PM CDT	Severe Thunderstorm Warning	OAX	Harrison	45 min
Aug 17, 9:00 PM CDT	Severe Thunderstorm Warning	OAX	Shelby	30 min
Aug 17, 10:07 PM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie	23 min
Aug 17, 10:27 PM CDT	Severe Thunderstorm Warning	OAX	Montgomery	48 min
Aug 17, 11:00 PM CDT	Severe Thunderstorm Warning	OAX	Mills	30 min
Aug 17, 11:14 PM CDT	Severe Thunderstorm Warning	OAX	Page	46 min

Nearby

Tornado Warnings in Iowa, 2001 Every tornado warning in 2001 Tornadoes in 2001

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.