Alert archive / Nebraska / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 6, NWS Sioux Falls, SD

April 7, 2001Dixon County, Nebraska

NWS Sioux Falls, SD issued this severe thunderstorm warning at Apr 7, 2001, 2:11 AM CDT for Dixon County, Nebraska. It was in force for 34 min. No storm report in the archive falls 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.

The facts

Issued: Apr 7, 2001, 2:11 AM CDT (07:11 UTC)
Expired: Apr 7, 2001, 2:45 AM CDT
In force: 34 min
Issued by: NWS Sioux Falls, SD
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Dixon County, NE

The radar

The Sioux Falls radar (KFSD), 113 km from the middle of the area, began a volume at 07:12 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 watch it was issued in

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

Issued	Product	Office	Lasted
Apr 7, 1:45 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 7.2 hours before the alert went out and 141 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: 770 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 454 m above ground
0-6 km bulk shear: 78 kt
0-1 km storm-relative helicity: 205 m²/s²
0-3 km storm-relative helicity: 278 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WUUS53 KFSD 070712
SVRFSD
IAC149-193-NEC043-051-SDC127-070745-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
211 AM CDT SAT APR 7 2001

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  DAKOTA COUNTY IN NORTHEAST NEBRASKA
  DIXON COUNTY IN NORTHEAST NEBRASKA
  PLYMOUTH COUNTY IN NORTHWEST IOWA
  WOODBURY COUNTY IN NORTHWEST IOWA
  UNION COUNTY IN SOUTHEAST SOUTH DAKOTA

* UNTIL 245 AM CDT

* AT 211 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM OVER JACKSON...OR ABOUT 8 MILES SOUTHWEST OF
  SIOUX CITY...MOVING NORTH AT 40 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  JEFFERSON AROUND 220 AM CDT
  ELK POINT...HINTON AROUND 225 AM CDT
  MERRILL AROUND 235 AM CDT
  AKRON...LE MARS AROUND 240 AM CDT

LAW ENFORCEMENT IN DAKOTA COUNTY REPORTED WINDS IN EXCESS OF 70 MPH 
AT 208 AM.
:
THIS STORM HAS A HISTORY OF PRODUCING DAMAGING WIND. GO INSIDE A
STURDY BUILDING AND STAY AWAY FROM WINDOWS.

LAT...LON 4243 9672 4235 9630 4278 9614 4292 9679

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 Sioux Falls, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 6, 9:35 PM CDT, 4 hours 36 minutes earlier.

Area forecast discussion, Apr 6, 9:35 PM CDT, 4 hours 36 minutes before

AREA FORECAST DISCUSSION FOR SOUTHEAST SD/SOUTHWEST MN/NORTHWEST IA
NATIONAL WEATHER SERVICE SIOUX FALLS SD
935 PM CDT FRI APR 6 2001

EMERGENCE OF DRYING ALFT OVER MOIST LOW LVLS...COMBINED WITH
ASCENT FORCING OF LARGE SCALE UPPER LOW HAS RESULTED IN THE MAIN
EVENT ACROSS THE PLAINS...AS WIDESPREAD THUNDERSTORMS HAVE ERUPTED.
SFC WMFNT CONTINUES TO WORK GRADUALLY NWRD...CLOSE TO KADU...KTQE...
KOLU...KODX LINE.  ELEVATED PARCELS INDICATED BY LAPS/RAOBS DO HAVE
SMALL CAPES WITH HIGH MAX THERMAL DIFFERENCES. HOWEVER...WIND
PROFILES IN USEFUL AIRMASS ABV INVERSION ARE HIGHLY UNIDIRECTIONAL.
NEXT FEW HOURS WILL BE CRITICAL FOR ANY PSBL SVR STORMS. TRAJECTORY
OF BROAD PRECIP AREA SEEMS IN LINE WITH CURRENT AREA OF FFA...AND WL
KEEP CLOSE EYE ON AS FFG FOR THESE COUNTIES ARE ON ORDER OF 1 TO 1.5
IN 3H.  STILL LOOKING FOR SFC LOW TO MOVE JUST N AND W OF KFSD LT
TNGT AND DRAW WM AIR AT SFC.  NO CHG TO HILITE PACKAGES ATTM.

.FSD...FLASH FLOOD WATCH TNGT AND ERY SAT    W OF JAMES RVR
       HIGH WIND WATCH   SATURDAY            MO RVR CORRIDOR
       HIGH WIND WATCH   LT SAT AM THRU AFTN SW MN INTO

CHAPMAN

In the hours before

Local storm report, Apr 6, 11:12 PM CDT, 2 hours 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1112 PM CDT FRI APR 06 2001

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

0921 PM    2 SE CARTHAGE             SD   .88 INCH HAIL
04/06/01   MINER                          REPORTED BY PUBLIC.

0930 PM    10 SW DE SMET             SD   .75 INCH HAIL
04/06/01   KINGSBURY                      REPORTED BY PUBLIC.

Local storm report, Apr 6, 11:23 PM CDT, 2 hours 48 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1123 PM CDT FRI APR 06 2001

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

0530 PM    DIXON                     NE   1.75 INCH HAIL
04/06/01   DIXON                          REPORTED BY FIRE AND
                                          RESCUE.

0532 PM    1 N DIXON                 NE   1.75 INCH HAIL
04/06/01   DIXON                          REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0540 PM    DIXON                     NE   LIGHTNING
04/06/01   DIXON                          LIGHTNING CAUSED HOUSE
                                          FIRE. REPORTED BY FIRE
                                          AND RESCUE.

0545 PM    5 NE DIXON                NE   1.5 INCH HAIL
04/06/01   DIXON                          REPORTED BY STORM
                                          SPOTTER.

0550 PM    MARTINSBURG               NE   .75 INCH HAIL
04/06/01   DIXON                          REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0550 PM    3 W PONCA                 NE   1.75 INCH HAIL
04/06/01   DIXON                          REPORTED BY LAW
                                          ENFORCEMENT OFFICIAL.

0552 PM    3 S ELK PT                SD   .75 INCH HAIL
04/06/01   UNION                          REPORTED BY PUBLIC.

0630 PM    4 E SIOUX RAPIDS          IA   HEAVY RAIN
04/06/01   BUENA VISTA                    .80 INCHES RAINFALL IN
                                          20 MINUTES. PONDING
                                          WATER IN SOME FIELDS.
                                          REPORTED BY COOPERATIVE
                                          OBSERVER.

0921 PM    2 SE CARTHAGE             SD   .88 INCH HAIL
04/06/01   MINER                          REPORTED BY PUBLIC.

0930 PM    10 SW DE SMET             SD   .75 INCH HAIL
04/06/01   KINGSBURY                      REPORTED BY PUBLIC.

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 7, 2:11 AM CDT	Severe Thunderstorm Warning	FSD	Dakota	34 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2001 Every 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.