Alert archive / Nebraska / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 430, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Sep 20, 2001, 9:30 AM CDT for Douglas County, Nebraska. It was in force for 45 min. 1 report 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
- Sep 20, 2001, 9:30 AM CDT (14:30 UTC)
- Expired
- Sep 20, 2001, 10:15 AM CDT
- In force
- 45 min
- Issued by
- NWS Omaha, NE
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Douglas County, NE
The radar
The Omaha radar (KOAX), 11 km from the middle of the area, began a volume at 14:32 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 |
|---|---|---|---|
| Sep 20, 10:15 AM CDT | Hail 0.75 | Omaha, NE |
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, 2.5 hours before the alert went out and 11 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.
- Mixed-layer CAPE
- 1212 J/kg
- Mixed-layer CIN
- -230 J/kg
- Mixed-layer LCL
- 1162 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 125 m²/s²
- 0-3 km storm-relative helicity
- 156 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.2
The text
As transmitted, in the capitals the NWS used until 2016.
750 WUUS53 KOAX 201431 SVROMA NEC055-201515- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE OMAHA NE 930 AM CDT THU SEP 20 2001 THE NATIONAL WEATHER SERVICE IN OMAHA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... DOUGLAS COUNTY IN EAST CENTRAL NEBRASKA THIS INCLUDES THE CITY OF OMAHA * UNTIL 1015 AM CDT * AT 929 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM NEAR VALLEY...OR ABOUT 20 MILES WEST OF OMAHA...MOVING EAST AT 35 MPH. * SOME LOCATIONS AFFECTED... BENNINGTON...ELKHORN...WASHINGTON OMAHA...BOYS TOWN...MILLARD IF YOU ARE IN THE WARNED AREA...PREPARE FOR DAMAGING WINDS...LARGE HAIL...HEAVY RAIN AND DANGEROUS LIGHTNING. GET INTO A REINFORCED BUILDING. STAY AWAY FROM WINDOWS AND GLASS DOORS. LAT...LON 4139 9650 4118 9632 4119 9592 4141 9596 MILLER
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 20, 7:42 AM CDT | Severe Thunderstorm Warning | OAX | Madison, Platte | 33 min |
| Sep 20, 8:10 AM CDT | Severe Thunderstorm Warning | OAX | Colfax | 50 min |
| Sep 20, 8:54 AM CDT | Severe Thunderstorm Warning | OAX | Dodge | 36 min |
| Sep 20, 9:44 AM CDT | Severe Thunderstorm Warning | OAX | Burt | 31 min |
| Sep 20, 9:52 AM CDT | Severe Thunderstorm Warning | OAX | Washington | 38 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 2001Every severe thunderstorm warning in 2001
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.