Alert archive / Iowa / Severe Thunderstorm Warnings in 1992

Severe Thunderstorm Warning 73, NWS Omaha, NE

July 18, 1992Pottawattamie County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Jul 18, 1992, 11:20 PM CDT for Pottawattamie County, Iowa. It was in force for 55 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: Jul 18, 1992, 11:20 PM CDT (04:20 UTC)
Expired: Jul 19, 1992, 12:15 AM CDT
In force: 55 min
Issued by: NWS Omaha, NE
Area: Whole counties

County Pottawattamie County, IA

What was reported inside it

Time	Report	Where	Remark
Jul 18, 11:30 PM CDT	Hail 1.75	Pottawattamie, 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 (KOVN), launched 00:00Z, 4.3 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: 492 J/kg
Mixed-layer CIN: -57 J/kg
Mixed-layer LCL: 1668 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 223 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 5.6

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Jul 18, 8:45 PM CDT, 2 hours 35 minutes before

NEZ015-019-190300-

SPECIAL WEATHER STATEMENT FOR SOUTHEAST NEBRASKA
NATIONAL WEATHER SERVICE LINCOLN NE
840 PM CDT SAT JUL 18 1992

...THUNDERSTORMS IN SEWARD AND FILLMORE COUNTY...

RADAR AT 840 PM INDICATED STRONG A THUNDERSTORM IN SEWARD COUNTY
ENTERING LANCASTER COUNTY AT THIS TIME.  PEOPLE IN WESTERN SEWARD
AND LANCASTER COUNTIES CAN EXPECT HEAVY RAIN AND DANGEROUS LIGHTNING
WITH THIS STORM UNTIL 930 PM.

ANOTHER AREA OF STRONG THUNDERSTORM$S WERE IN SOUTHWEST FILLMORE COUNTY
MOVING INTO NORTHERN THAYER COUNTY NEAR THE TOWN OF BELVIDERE.  THIS
STORM IS MOVING SOUTHEAST AT 20 MPH AND IS EXPECTED INTO JEFFERSON
COUNTY AT 915PM.

          SCHLACHTER

Special weather statement, Jul 18, 8:50 PM CDT, 2 hours 30 minutes before

NEZ003-004-007-008-009-190230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORFOLK NE
845 PM CDT SAT JUL 18 1992

...STRONG THUNDERSTORM IN NORTHEAST NEBRASKA...

AT 840 RADAR INDICATED A VERY STONG THUNDERSTORM SOUTH OF LEIGH OR
15 MILES NORTHEAST OF COLUMBUS.  THE STORM IS MOVING TO THE SOUTHEAST
AT 25 MPH.  THE STORM WILL PASS NEAR THE COMMUNITY OF SCHUYLER DURING
THE NEXT 30 MINUTES.

BRIEF HEAVY RAIN...GUSTY WIND AND SMALL HAIL ARE POSSIBLE FROM THIS
STORM.  PEOPLE IN THE PATH OF THE STORM SHOULD BE AWARE OF RAPIDLY
CHANGING WEATHER AND BE READY TO SEEK SHELTER IF THE STORM BECOMES
SEVERE.

MML

Special weather statement, Jul 18, 8:57 PM CDT, 2 hours 23 minutes before

NEZ010-015-020-IAZ056-080-090-091-190230-

SPECIAL WEATHERR STATEMENT
NATIONAL WEATHER SERVICE OMAHA NE
857 PM CDT SAT JUL 18 1992

...SEVERE THUNDERSTORM WATCH UNTIL 2AM CDT SOUTHEAST NEBRASKA...

AT 845 PM CDT...OMAHA RADAR SHOWED AN INTENSE THUNDERSTORM NEAR GLENWOOD
IOWA.  THIS STORM IS PRODUCING BRIEF HEAVY RAIN...DANGEROUS LIGHTNING...
AND POSSIBLE SMALL HAIL AND MOVING SOUTHEAST AT 25 MPH.  PERSONS IN
MALVERN...HASTINGS...AND RANDOLPH IN SOUTHWEST IOWA SHOULD BE ALERT
FOR THREATENING WEATHER THROUGH 930 PM AND BE READY TO SEEK SHELTER
SHOULD SEVERE WEATHER DEVELOP.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 2AM FOR MUCH OF
SOUTHEAST NEBRASKA.  INTENSE THUNDERSTORMS WITHIN THE WATCH AREA
WERE INDICATED BY RADAR TO THE NORTHWEST OF LINCOLN IN BUTLER AND
SEWARD COUNTIES.

STAY TUNED TO NOAA WEATHER RADIO FOR FURTHER INFORMATION CONCERNING
THIS POTENTIALLY DANGEROUS WETHER SITUATION.

KLEMM

Special weather statement, Jul 18, 10:24 PM CDT, 56 minutes before

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Special weather statement, Jul 18, 10:40 PM CDT, 40 minutes before

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Special weather statement, Jul 18, 11:16 PM CDT, 4 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 8:59 PM CDT	Severe Thunderstorm Warning	OAX	Seward	61 min
Jul 18, 9:21 PM CDT	Tornado Warning	OAX	Seward	54 min
Jul 18, 9:45 PM CDT	Severe Thunderstorm Warning	OAX	Lancaster	57 min
Jul 18, 9:57 PM CDT	Tornado Warning	OAX	Saline	33 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1992 Every severe thunderstorm warning in 1992

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.