Alert archive / Nebraska / Tornado Warnings in 2001

Tornado Warning 79, NWS Omaha, NE

October 9, 2001Platte County, Nebraska

NWS Omaha, NE issued this tornado warning at Oct 9, 2001, 6:29 PM CDT for Platte County, Nebraska. It was in force for 46 min. 2 reports came from 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, with what was reported inside it.

The facts

Issued: Oct 9, 2001, 6:29 PM CDT (23:29 UTC)
Expired: Oct 9, 2001, 7:15 PM CDT
In force: 46 min
Issued by: NWS Omaha, NE
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Platte County, NE

The radar

The Omaha radar (KOAX), 100 km from the middle of the area, began a volume at 23:33 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
Oct 9, 6:30 PM CDT	Tornado F1	Silver Creek, NE	Tornado entered Merrick County from Polk County.
Oct 9, 6:54 PM CDT	Tornado F0	Duncan, NE	This tornado was caught on film by a storm chaser and was produced by the same supercell that earlier produced a tornado that caused damage in the Silver Creek area southwest of Platte county. In Platte county, no apparent damage was noted from this tornado.

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
Oct 9, 3:30 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.5 hours before the alert went out and 99 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: 7 J/kg
Mixed-layer CIN: -233 J/kg
Mixed-layer LCL: 854 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 90 m²/s²
0-3 km storm-relative helicity: 123 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.

240 
WFUS53 KOAX 092329
TOROMA
NEC141-100015-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OMAHA NE
629 PM CDT TUE OCT 9 2001

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* TORNADO WARNING FOR...
  PLATTE COUNTY IN NORTHEAST NEBRASKA
  THIS INCLUDES THE CITY OF COLUMBUS

* UNTIL 715 PM CDT

* AT 623 PM CDT...THERE HAD BEEN SEVERAL REPORTS OF A TORNADO 11   
MILES SOUTHWEST OF DUNCAN...OR ABOUT 18 MILES SOUTHWEST OF   
COLUMBUS...MOVING NORTHEAST AT 30 MPH.

* SOME LOCATIONS AFFECTED...
  DUNCAN...MONROE
  PLATTE CENTER
  COLUMBUS

A TORNADO WATCH REMAINS IN EFFECT UNTIL 900 PM CDT TUESDAY EVENING
FOR EASTERN NEBRASKA.

LAT...LON 4134 9778 4120 9762 4147 9727 4174 9732

ZAPOTOCNY

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 9, 11:48 AM CDT	Severe Thunderstorm Warning	OAX	Burt	42 min
Oct 9, 4:41 PM CDT	Severe Thunderstorm Warning	OAX	Boone	64 min
Oct 9, 5:17 PM CDT	Tornado Warning	OAX	Boone	28 min
Oct 9, 6:00 PM CDT	Severe Thunderstorm Warning	OAX	Platte	30 min
Oct 9, 6:21 PM CDT	Severe Thunderstorm Warning	OAX	Boone	24 min
Oct 9, 6:42 PM CDT	Tornado Warning	OAX	Boone	33 min

Nearby

Tornado Warnings in Nebraska, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.