Alert archive / Nebraska / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 65, NWS Sioux Falls, SD

July 13, 1997Dakota County, Nebraska

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 13, 1997, 5:00 AM CDT for Dakota County, Nebraska. It was in force for 45 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
Jul 13, 1997, 5:00 AM CDT (10:00 UTC)
Expired
Jul 13, 1997, 5:45 AM CDT
In force
45 min
Issued by
NWS Sioux Falls, SD
Area
Whole counties

County Dakota County, NE

The radar

The Omaha radar (KOAX), 120 km from the middle of the area, began a volume at 10:02 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, 10.0 hours before the alert went out and 120 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 1997-07-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3403 joules per kilogram.LCLEL10008507005003002001001 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 1997-07-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 69 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
3403 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1291 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
69 m²/s²
0-3 km storm-relative helicity
126 m²/s²
Significant tornado parameter
0.8
Supercell composite
6.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KFSD 131002 RRA
SVRFSD
NEC043-SDC027-131045-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
500 AM CDT SUN JUL 13 1997

* SEVERE THUNDERSTORM WARNING FOR
  SOUTHERN CLAY COUNTY IN SOUTHEASTERN SOUTH DAKOTA
  NORTHERN DIXON COUNTY IN NORTHEASTERN NEBRASKA

* UNTIL 545 AM CDT
 
* SOME AREAS AFFECTED
  MECKLING                 AROUND 520 AM CDT
  VERMILLION               AROUND 525 AM CDT
  BURBANK                  AROUND 535 AM CDT

* AT 456 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM 16 MILES SOUTHEAST OF YANKTON  OR 15 MILES
  SOUTHWEST OF MECKLING MOVING NORTHEAST AT 30 MPH.
 
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...
DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN.  FOR YOUR
PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS.

BLOOM

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 Jul 12, 8:19 PM CDT, 8 hours 41 minutes earlier.

Area forecast discussion, Jul 12, 8:19 PM CDT, 8 hours 41 minutes before
SOUTH DAKOTA/NORTHWEST IOWA/SOUTHWEST MINNESOTA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SIOUX FALLS SD
815 PM CDT SAT JUL 12 1997

TROPICAL SHRA/TSRA THAT DVLPD OVR SERN SD LATE THIS AFTN HAD DSIPTD BY
01Z. STILL HAVE A FEW WDLY SCTD TSRA OVR EXTRM SERN PORTION OF NWRN IA
IN OUR CWA WHICH WL LKLY CONT THRU 04Z. STRONG/SVR STORMS OVR SWRN SD
NOT IN ANY HURRY TO MOV EWD AS UPR LVL SHRTWV HOLDS IN NRN RCKYS.
STARTING TO SEE SOME EWD PUSH OF THIS SYSTEM...AND MODELS ALL SHOW THIS
MOVG THRU DKTAS BETWEEN 12Z SUNDAY AND 00Z MONDAY.

FSD CWA CUD SEE SOME SHRA/TSRA MOVG IN FM W LATE TNGT...BUT DO NOT FEEL
THAT SWRN SD STORMS WL HOLD TOGETHER INTO CNTRL SD PAST MDNGT AS THEY
MOV AWAY FROM UPR LVL SUPPORT. NEARLY ALL OF OUR AREA WL LIKELY HAVE TO
WAIT FOR REDEVELOPMENT DURING THE DAY SUNDAY. THEREFORE...WL CUT BACK
OR DROP MENTION OF POPS FOR TNGT FOR MUCH OF THE CWA XCPT FOR THE XTRM
SERN AND WRN PORTIONS.

OVRNGT LOWS FOR THE FSD CWA LOOK PRETTY GOOD. MAY MAKE SOME MINOR
ADJUSTMENTS.

.FSD...NONE

GILLISPIE

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 5:38 AM CDTSevere Thunderstorm WarningFSDDakota32 min

Nearby

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