Alert archive / Iowa / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 68, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 13, 1997, 6:08 AM CDT for Woodbury County, Iowa. It was in force for 32 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, 6:08 AM CDT (11:08 UTC)
- Expired
- Jul 13, 1997, 6:40 AM CDT
- In force
- 32 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Whole counties
County Woodbury County, IA
The radar
The Omaha radar (KOAX), 122 km from the middle of the area, began a volume at 11:12 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 nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 11.1 hours before the alert went out and 122 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
- 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
The text
As transmitted, in the capitals the NWS used until 2016.
710 WUUS1 KFSD 131111 RRA SVRFSD IAC193-131140- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SIOUX FALLS SD 608 AM CDT SUN JUL 13 1997 * SEVERE THUNDERSTORM WARNING FOR WESTERN WOODBURY COUNTY IN NORTHWESTERN IOWA * UNTIL 640 AM CDT * SOME AREAS AFFECTED LUTON AROUND 610 AM CDT BRONSON AROUND 615 AM CDT LAWTON AROUND 615 AM CDT CLIMBING HILL AROUND 625 AM CDT MOVILLE AROUND 630 AM CDT * AT 603 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM IN THE VICINITY OF SIOUX CITY MOVING EAST AT 30 MPH. SEVERE THUNDERSTORMS PRODUCE DAMAGING 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, 9 hours 49 minutes earlier.
Area forecast discussion, Jul 12, 8:19 PM CDT, 9 hours 49 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
Nearby
Severe Thunderstorm Warnings in Iowa, 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.