Alert archive / Nebraska / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 117, NWS Omaha, NE

May 28, 2002Sarpy County, Nebraska; Pottawattamie County, Iowa

NWS Omaha, NE issued this severe thunderstorm warning at May 28, 2002, 3:07 AM CDT for Sarpy County, Nebraska; Pottawattamie County, Iowa. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
May 28, 2002, 3:07 AM CDT (08:07 UTC)
Expired
May 28, 2002, 3:30 AM CDT
In force
23 min
Issued by
NWS Omaha, NE
Area
Counties, with a storm outline in the text

Counties Pottawattamie County, IA, Sarpy County, NE

The radar

The Omaha radar (KOAX), 46 km from the middle of the area, began a volume at 08:09 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.

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 8.1 hours before the alert went out and 47 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 00:00Z on 2002-05-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 555 joules per kilogram.LCLLFCEL10008507005003002001001 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 00:00Z on 2002-05-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -16 square meters per square second.193958Sfc1 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
555 J/kg
Mixed-layer CIN
-117 J/kg
Mixed-layer LCL
1882 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
-16 m²/s²
0-3 km storm-relative helicity
49 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

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.

NWS Omaha, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at May 28, 2:50 AM CDT, 17 minutes earlier.

Area forecast discussion, May 28, 2:50 AM CDT, 17 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
250 AM CDT TUE MAY 28 2002

MCS OVER FORECAST AREA THIS MORNING WITH LINE STARTING TO PUSH INTO
IOWA AT 0730Z.  EXPECT THUNDERSTORMS TO END ACROSS AREA THIS MORNING
AS TROF OVER THE NORTHERN PLAINS SHIFTS EAST.  SOME CHANCE OF
ADDITIONAL THUNDERSTORMS THIS AFTERNOON AND EVENING AS SFC TROF
OVER NRN PLAINS WORKS ITS WAY EAST.  ONLY REAL CHANGE TO GOING
FORECAST WAS TO INCREASE TEMPS FOR TODAY AND WEDNESDAY. REMAINDER
OF FORECAST LEFT PRETTY MUCH ALONE DUE TO ONGOING CONVECTION THIS
MORNING.

IF YOU HAVE COMMENTS ON THE NEW FORECAST DISCUSSION FORMAT...PLEASE
E-MAIL THEM TO W-OAX.WEBMASTER@NOAA.GOV OR CALL DAVE THEOPHILUS AT
402-359-5166.

.OMA...NONE.
FOBERT

The office that day

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

IssuedProductOfficeCountiesLasted
May 27, 11:45 PM CDTSevere Thunderstorm WarningOAXButler, Seward45 min
May 27, 11:48 PM CDTSevere Thunderstorm WarningOAXPawnee42 min
May 27, 11:58 PM CDTSevere Thunderstorm WarningOAXGage32 min
May 28, 12:07 AM CDTSevere Thunderstorm WarningOAXAntelope38 min
May 28, 12:29 AM CDTSevere Thunderstorm WarningOAXGage31 min
May 28, 12:29 AM CDTSevere Thunderstorm WarningOAXButler46 min
May 28, 12:38 AM CDTSevere Thunderstorm WarningOAXJohnson37 min
May 28, 12:53 AM CDTSevere Thunderstorm WarningOAXSaline37 min
May 28, 12:59 AM CDTSevere Thunderstorm WarningOAXGage, Johnson46 min
May 28, 1:12 AM CDTSevere Thunderstorm WarningOAXJefferson33 min
May 28, 1:46 AM CDTSevere Thunderstorm WarningOAXGage, Jefferson44 min
May 28, 1:48 AM CDTSevere Thunderstorm WarningOAXLancaster, Saline27 min
May 28, 2:12 AM CDTSevere Thunderstorm WarningOAXCass, Lancaster, Otoe48 min
May 28, 2:25 AM CDTSevere Thunderstorm WarningOAXDouglas, Washington35 min
May 28, 2:30 AM CDTSevere Thunderstorm WarningOAXSarpy30 min
May 28, 2:34 AM CDTFlash Flood WarningOAXGage, Jefferson4 hr
May 28, 3:14 AM CDTFlash Flood WarningOAXJohnson, Pawnee4 hr

Nearby

Severe Thunderstorm Warnings in Nebraska, 2002Severe Thunderstorm Warnings in Iowa, 2002Every severe thunderstorm warning in 2002

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; radar from the NEXRAD Level II archive.