Alert archive / Iowa / Tornado Warnings in 2000

Tornado Warning 52, NWS Omaha, NE

July 26, 2000Mills County, Iowa; Cass County, Nebraska

NWS Omaha, NE issued this tornado warning at Jul 26, 2000, 7:32 PM CDT for Mills County, Iowa; Cass County, Nebraska. It was in force for 28 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: Jul 26, 2000, 7:32 PM CDT (00:32 UTC)
Expired: Jul 26, 2000, 8:00 PM CDT
In force: 28 min
Issued by: NWS Omaha, NE
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Mills County, IA, Cass County, NE

The radar

The Omaha radar (KOAX), 59 km from the middle of the area, began a volume at 00:32 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
Jul 26, 7:48 PM CDT	Hail 0.75	Plattsmouth, NE
Jul 26, 7:49 PM CDT	Hail 1.75	Pacific Jct, 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
Jul 26, 2:30 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 0.5 hours before the alert went out and 59 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: 3294 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1204 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 65 m²/s²
0-3 km storm-relative helicity: 186 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 9.9

Open this sounding in Storm Lab

The text

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

229 
WFUS53 KOAX 270032
TOROMA
IAC129-NEC025-270100-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
732 PM CDT WED JUL 26 2000

THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN CASS COUNTY IN SOUTHEAST NEBRASKA
  WESTERN MILLS COUNTY IN SOUTHWEST IOWA

* UNTIL 800 PM CDT

* AT 727 PM CDT...RADAR INDICATED A THUNDERSTORM WITH VERY STRONG
  ROTATION AND A DEVELOPING TORNADO 2 MILES NORTHEAST OF PACIFIC
  JUNCTION...OR ABOUT 19 MILES SOUTHEAST OF OMAHA...MOVING SOUTHWEST
  AT 25 MPH.

SOME LOCATIONS IN THE PATH OF THE TORNADO THROUGH 800 PM CDT
  INCLUDE...PLATTSMOUTH...MURRAY...NEHAWKA...UNION...

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.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 800 PM CDT WEDNESDAY EVENING
FOR SOUTHWESTERN IOWA AND EASTERN NEBRASKA.

LAT...LON 4103 9564 4115 9582 4087 9620 4072 9598

MEAD

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 7:02 PM CDT	Tornado Warning	OAX	Mills	28 min
Jul 26, 7:19 PM CDT	Severe Thunderstorm Warning	OAX	Pottawattamie	26 min
Jul 26, 7:41 PM CDT	Severe Thunderstorm Warning	OAX	Fremont	34 min
Jul 26, 7:56 PM CDT	Severe Thunderstorm Warning	OAX	Fremont, Page	49 min
Jul 26, 7:36 PM CDT	Severe Thunderstorm Warning	OAX	Sarpy	24 min
Jul 26, 7:56 PM CDT	Severe Thunderstorm Warning	OAX	Cass, Otoe, Sarpy	49 min
Jul 26, 8:42 PM CDT	Severe Thunderstorm Warning	OAX	Nemaha, Richardson	48 min
Jul 26, 8:43 PM CDT	Severe Thunderstorm Warning	OAX	Cass	37 min
Jul 26, 8:59 PM CDT	Severe Thunderstorm Warning	OAX	Otoe	31 min
Jul 26, 9:24 PM CDT	Severe Thunderstorm Warning	OAX	Johnson, Nemaha	36 min
Jul 27, 6:41 PM CDT	Severe Thunderstorm Warning	OAX	Jefferson	34 min

Nearby

Tornado Warnings in Iowa, 2000 Tornado Warnings in Nebraska, 2000 Every tornado warning in 2000 Tornadoes in 2000

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.