Alert archive / Nebraska / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 288, NWS Omaha, NE

August 17, 20024 counties in Nebraska

NWS Omaha, NE issued this severe thunderstorm warning at Aug 17, 2002, 3:51 AM CDT for 4 counties in Nebraska. It was in force for 24 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: Aug 17, 2002, 3:51 AM CDT (08:51 UTC)
Expired: Aug 17, 2002, 4:15 AM CDT
In force: 24 min
Issued by: NWS Omaha, NE
Area: Counties, with a storm outline in the text

Counties Gage County, NE, Jefferson County, NE, Johnson County, NE, Pawnee County, NE

The radar

The Omaha radar (KOAX), 121 km from the middle of the area, began a volume at 08:54 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 17, 1:05 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 8.9 hours before the alert went out and 121 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: 3070 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 1356 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 229 m²/s²
0-3 km storm-relative helicity: 597 m²/s²
Significant tornado parameter: 3.9
Supercell composite: 18.4

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 Aug 17, 3:30 AM CDT, 21 minutes earlier.

Area forecast discussion, Aug 17, 3:30 AM CDT, 21 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
330 AM CDT SAT AUG 17 2002

SYNOPSIS...LINE OF STORMS PUSHING RAPIDLY SE THIS MORNING IN ADVANCE
OF COLD FRONT. RADAR INDICATED SRN PORTION OF THE LINE HAVING MORE OF
AN EASTERLY MOVEMENT SO WILL HANG ON TO SCT TSTMS FOR SERN BORDER AREA
FIRST PART OF THE MORNING. EXPECT FRONT TO MOVE THROUGH SERN COUNTIES
BY MID MRNG.

MODELS INDICATE FRONT TO HANG UP LATER TODAY ACROSS KANSAS THEN
REMAIN NEAR SERN BORDER AREA INTO MONDAY. H85 MOIST AXIS ALSO
IN PLACE NEARBY SO WILL CONTINUE SOME POPS FOR SERN ZONES SUNDAY
INTO MONDAY...TRENDING MORE TOWARD AVN.  REMAINDER OF FORECAST
LITTLE CHANGED.

.OMA...NONE.

FOBERT

In the hours before

Local storm report, Aug 16, 9:54 PM CDT, 5 hours 57 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
954 PM CDT FRI AUG 16 2002

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0913 AM    MONROE                    NE   4.5 INCH HAIL
08/16/02   PLATTE                         REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0930 AM    1 W MONROE                NE   2.75 INCH HAIL
08/16/02   PLATTE                         REPORTED BY EMERGENCY
                                          MANAGEMENT.

0930 AM    PLATTE CENTER             NE   1 INCH HAIL
08/16/02   PLATTE                         REPORTED BY PUBLIC.

0930 AM    4 E MANLEY                NE   .88 INCH HAIL
08/16/02   CASS                           REPORTED BY PUBLIC.

1040 AM    PIERCE                    NE   1.75 INCH HAIL
08/16/02   PIERCE                         REPORTED BY EMERGENCY
                                          MANAGEMENT.

1042 AM    5 S DAVID CITY            NE   1.75 INCH HAIL
08/16/02   BUTLER                         REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

1105 AM    CROFTON                   NE   1.25 INCH HAIL
08/16/02   KNOX                           HAIL COVERING THE
                                          GROUND, REPORTED BY
                                          EMERGENCY MANAGEMENT.

1120 AM    CROFTON                   NE   1.75 INCH HAIL
08/16/02   KNOX                           REPORTED BY EMERGENCY
                                          MANAGEMENT. EVENT
                                          DURATION 7 MINUTES.

1125 AM    HARTINGTON                NE   .75 INCH HAIL
08/16/02   CEDAR                          REPORTED BY STORM
                                          SPOTTER.

1130 AM    FREMONT                   NE   1.75 INCH HAIL
08/16/02   DODGE                          REPORTED BY PUBLIC.

1130 AM    FREMONT                   NE   1 INCH HAIL
08/16/02   DODGE                          REPORTED BY EMERGENCY
                                          MANAGEMENT.

1130 AM    5 NE WYNOT                NE   1 INCH HAIL
08/16/02   CEDAR                          REPORTED BY PUBLIC.

1132 AM    FREMONT                   NE   .75 INCH HAIL
08/16/02   DODGE                          REPORTED BY STORM
                                          SPOTTER.

1134 AM    FREMONT                   NE   1.25 INCH HAIL
08/16/02   DODGE                          REPORTED BY STORM
                                          SPOTTER.

1152 AM    2 N GLENWOOD              IA   .75 INCH HAIL
08/16/02   MILLS                          REPORTED BY STORM
                                          SPOTTER.

1155 AM    FORDYCE                   NE   .75 INCH HAIL
08/16/02   CEDAR                          REPORTED BY STORM
                                          SPOTTER.

1201 PM    PENDER                    NE   1 INCH HAIL
08/16/02   THURSTON                       HEAVY RAIN WITH 1.20
                                          INCHES IN LESS THAN AN
                                          HOUR REPORTED BY STORM
                                          SPOTTER.

1225 PM    1 N MISSOURI VLY          IA   .75 INCH HAIL
08/16/02   HARRISON                       REPORTED BY EMERGENCY
                                          MANAGEMENT.

1225 PM    1 N PENDER                NE   .75 INCH HAIL
08/16/02   THURSTON                       REPORTED BY EMERGENCY
                                          MANAGEMENT.

1255 PM    WINNEBAGO                 NE   1 INCH HAIL
08/16/02   THURSTON                       REPORTED BY EMERGENCY
                                          MANAGEMENT.

0122 PM    WYNOT                     NE   1.75 INCH HAIL
08/16/02   CEDAR                          REPORTED BY FIRE AND
                                          RESCUE.

0649 PM    NIOBRARA                  NE   1 INCH HAIL
08/16/02   KNOX                           REPORTED BY STORM
                                          SPOTTER.

0705 PM    NIOBRARA                  NE   2 INCH HAIL
08/16/02   KNOX                           REPORTED BY COOPERATIVE
                                          OBSERVER.

0806 PM    7 N CROFTON               NE   .88 INCH HAIL
08/16/02   KNOX                           REPORTED BY STORM
                                          SPOTTER. GAVINS POINT DAM

0810 PM    3 NW ST HELENA            NE   1.75 INCH HAIL
08/16/02   CEDAR                          REPORTED BY PUBLIC.

0825 PM    3 NW ST HELENA            NE   1.75 INCH HAIL
08/16/02   CEDAR                          REPORTED BY PUBLIC.

Local storm report, Aug 17, 3:48 AM CDT, 3 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE OMAHA/VALLEY NE
348 AM CDT SAT AUG 17 2002

TIME(CDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0255 AM    WILBER                    NE   60 MPH TSTM GUST
08/17/02   SALINE                         REPORTED BY EMERGENCY
                                          MANAGEMENT.

0256 AM    10 W WILBER               NE   60 MPH TSTM GUST
08/17/02   SALINE                         REPORTED BY EMERGENCY
                                          MANAGEMENT.

0301 AM    WILBER                    NE   64 MPH TSTM GUST
08/17/02   SALINE                         REPORTED BY EMERGENCY
                                          MANAGEMENT.

0330 AM    CRETE, DEWITT, DORCHESTER NE   WIND DAMAGE
           AND WILBER                     REPORTED BY EMERGENCY
08/17/02   SALINE                         MANAGEMENT. NUMEROUS
                                          REPORTS OF TREES AND
                                          UTILITY POLES DOWN.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 16, 7:25 PM CDT	Tornado Warning	OAX	Knox	35 min
Aug 16, 7:57 PM CDT	Tornado Warning	OAX	Cedar, Knox	33 min
Aug 16, 8:31 PM CDT	Severe Thunderstorm Warning	OAX	Cedar	29 min
Aug 17, 12:02 AM CDT	Severe Thunderstorm Warning	OAX	Antelope	28 min
Aug 17, 12:17 AM CDT	Severe Thunderstorm Warning	OAX	Pierce, Wayne	43 min
Aug 17, 12:30 AM CDT	Severe Thunderstorm Warning	OAX	Antelope, Boone, Madison	60 min
Aug 17, 12:39 AM CDT	Severe Thunderstorm Warning	OAX	Cedar	36 min
Aug 17, 1:04 AM CDT	Severe Thunderstorm Warning	OAX	Thurston, Wayne	41 min
Aug 17, 1:16 AM CDT	Severe Thunderstorm Warning	OAX	Cuming, Stanton	44 min
Aug 17, 1:42 AM CDT	Severe Thunderstorm Warning	OAX	Colfax, Dodge	48 min
Aug 17, 1:53 AM CDT	Severe Thunderstorm Warning	OAX	Burt	22 min
Aug 17, 2:55 AM CDT	Severe Thunderstorm Warning	OAX	Cass, Lancaster, Otoe, Sarpy	35 min
Aug 17, 3:03 AM CDT	Severe Thunderstorm Warning	OAX	Gage, Jefferson, Saline	42 min
Aug 17, 3:13 AM CDT	Severe Thunderstorm Warning	OAX	Johnson, Pawnee	32 min
Aug 17, 3:27 AM CDT	Severe Thunderstorm Warning	OAX	Nemaha, Richardson	33 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2002 Every 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.