Alert archive / Iowa / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 8, NWS Omaha, NE

May 2, 1997Fremont County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at May 2, 1997, 4:24 PM CDT for Fremont County, Iowa. It was in force for 31 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
May 2, 1997, 4:24 PM CDT (21:24 UTC)
Expired
May 2, 1997, 4:55 PM CDT
In force
31 min
Issued by
NWS Omaha, NE
Area
Whole counties

County Fremont County, IA

The radar

The Omaha radar (KOAX), 90 km from the middle of the area, began a volume at 21:24 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

TimeReportWhereRemark
May 2, 4:25 PM CDTHail 0.75Sidney, 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 nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 9.4 hours before the alert went out and 91 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-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 1997-05-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 1997-05-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 181 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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
500 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
181 m²/s²
0-3 km storm-relative helicity
196 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 KOMA 022124 RRA
SVROMA
IAC071-022155-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
424 PM CDT FRI MAY 2 1997

* SEVERE THUNDERSTORM WARNING FOR
  FREMONT COUNTY - IN SOUTHWESTERN IOWA

* UNTIL 455 PM CDT
 
* SOME LOCATIONS AFFECTED
  SIDNEY                       BY AROUND 420 PM CDT
  ANDERSON                     BY AROUND 425 PM CDT
  RIVERTON                     BY AROUND 430 PM CDT
  RANDOLPH                     BY AROUND 430 PM CDT
  FARRAGUT                     BY AROUND 445 PM CDT
  IMOGENE                      BY AROUND 450 PM CDT

* AT 423 PM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY DOPPLER
  RADAR 35 MILES SOUTH SOUTHEAST OF DOWNTOWN OMAHA OR 3 MILES
  NORTHWEST OF SIDNEY MOVING EAST AT 25 MPH.

HAIL AROUND ONE INCH IN DIAMETER IS POSSIBLE WITH THIS STORM.
 
TAKE SHELTER IN A REINFORCED BUILDING ON THE LOWEST FLOOR.  DRIVERS
SHOULD WATCH OUT FOR WATER OVER ROADS...IN UNDE@RPASSES AND NEAR
STREAMS.  REPORTS OF SEVERE WEATHER OR DAMAGE CAN BE GIVEN TO A
LAW ENFORCEMENT AGENCY FOR RELAY TO THE NATIONAL WEATHER SERVICE.

MILLER

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, May 2, 10:58 AM CDT, 5 hours 26 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093-
IAZ043-055-056-069-079-080-090-091-030900-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1100 AM CDT FRI MAY 02 1997

...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA...

SPOTTER ACTION...
STORM SPOTTER ACTIVATION IS NOT EXPECTED FOR THIS AFTERNOON OR TONIGHT
IN EASTERN NEBRASKA AND SOUTHWEST IOWA.

DISCUSSION...
COLD AIR ALOFT AND RESIDUAL MOISTURE AT THE SURFACE WILL ALLOW SCATTERED
SHOWERS AND A FEW THUNDERSTORMS TO REDEVELOP ACROSS THE AREA THIS
AFTERNOON INTO THE EVENING.  ANY STORMS THAT DO DEVELOP HOWEVER
ARE EXPECTED TO REMAIN BELOW SEVERE LIMITS.

FOBERT
Special weather statement, May 2, 11:00 AM CDT, 5 hours 24 minutes before
NEZ011-012-015>018-030>034-042>045-050>053-065>068-078-088>093-
IAZ043-055-056-069-079-080-090-091-030900-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
1100 AM CDT FRI MAY 02 1997

...SEVERE WEATHER OUTLOOK FOR EASTERN NEBRASKA AND SOUTHWEST IOWA...

SPOTTER ACTION...
STORM SPOTTER ACTIVATION IS NOT EXPECTED FOR THIS AFTERNOON OR TONIGHT
IN EASTERN NEBRASKA AND SOUTHWEST IOWA.

DISCUSSION...
COLD AIR ALOFT AND RESIDUAL MOISTURE AT THE SURFACE WILL ALLOW SCATTERED
SHOWERS AND A FEW THUNDERSTORMS TO REDEVELOP ACROSS THE AREA THIS
AFTERNOON INTO THE EVENING.  ANY STORMS THAT DO DEVELOP HOWEVER
ARE EXPECTED TO REMAIN BELOW SEVERE LIMITS.

FOBERT
Special weather statement, May 2, 3:19 PM CDT, 1 hour 5 minutes before
IAZ079-080-090-091-NEZ065>068-078-022120-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
318 PM CDT FRI MAY 2 1997

AT 310 PM RADAR INDICATED THAT A LINE OF THUNDERSTORMS...SOME STRONG
HAD DEVELOPED FROM SOUTHEAST OF SEWARD TO NEBRASKA CITY
TO SIDNEY IOWA.  THESE STORMS PRODUCED DIME TO MARBLE SIZED
HAIL IN NEBRASKA CITY AT 305 PM.  THE EASTERN PORTION OF THE LINE
WAS MOVING NORTHEAST WITH THE WESTERN PORTION MOVING SOUTHEAST.

THUNDERSTORMS WILL CONTINUE TO DEVELOP ACROSS SOUTHEAST NEBRASKA
INTO SOUTHWEST IOWA THROUGH THE EVENING...WITH SOME PRODUCING SMALL
HAIL AND HEAVY RAINS.

LJH

The office that day

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

IssuedProductOfficeCountiesLasted
May 2, 4:59 PM CDTSevere Thunderstorm WarningOAXFremont, Page61 min

Nearby

Severe Thunderstorm Warnings in Iowa, 1997Every severe thunderstorm warning in 1997

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.