Alert archive / Nebraska / Flash Flood Warnings in 1996

Flash Flood Warning 4, NWS Cheyenne, WY

August 3, 1996Sioux County, Nebraska

NWS Cheyenne, WY issued this flash flood warning at Aug 3, 1996, 3:41 PM MDT for Sioux County, Nebraska. It was in force for 19 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 3, 1996, 3:41 PM MDT (21:41 UTC)
Expired
Aug 3, 1996, 4:00 PM MDT
In force
19 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Sioux County, NE

The radar

The Cheyenne radar (KCYS), 172 km from the middle of the area, began a volume at 21:43 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

Rapid City, SD (KUNR), launched 12:00Z, 9.7 hours before the alert went out and 190 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, Rapid City, SD at 12:00Z on 1996-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3 joules per kilogram.LCLLFCEL10008507005003002001001 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, Rapid City, SD at 12:00Z on 1996-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -55 square meters per square second.19395878Sfc1 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
3 J/kg
Mixed-layer CIN
-408 J/kg
Mixed-layer LCL
3714 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
-55 m²/s²
0-3 km storm-relative helicity
127 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Special weather statement, Aug 3, 10:09 AM MDT, 5 hours 32 minutes before
WYZ059>070-NEZ001>003-019>021-054-055-032300-

SEVERE WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
1008 AM MDT SAT AUG 3 1996

THE SEVERE WEATHER POTENTIAL IN THE COUNTY WARNING AREA OF THE CHEYENNE
NATIONAL WEATHER SERVICE OFFICE IS LOW THIS AFTERNOON AND EVENING IN
SOUTHEAST WYOMING AND THE WESTERN NEBRASKA PANHANDLE.  IT IS MEDIUM
IN THE CENTRAL AND EASTERN PARTS OF THE NEBRASKA PANHANDLE.

SPOTTER ACTIVATION MAY BE NECESSARY IN PARTS OF THE NEBRASKA PANHANDLE.

DISCUSSION...AN UNSTABLE AIR MASS WILL REMAIN OVER THE OUTLOOK AREA
 TODAY.  HOWEVER...LOWER LEVELS OF THE ATMOSPHERE WILL BE DRYING SOME
 THIS AFTERNOON...LEAVING THE BEST MOISTURE OVER THE EAST HALF OF THE
 NEBRASKA PANHANDLE.  WIDELY SCATTERED THUNDERSTORMS ARE EXPECTED TO
 DEVELOP OVER THE AREA...WITH SOME CAUSING GUSTY WINDS AND SMALL HAIL.
<
THIS OUTLOOK IS FOR THE FOLLOWING COUNTIES IN SOUTHEAST WYOMING AND
THE NEBRASKA PANHANDLE:

WY...ALBANY   CARBON   CONVERSE   GOSHEN   LARAMIE   NIOBRARA   PLATTE

NE...BANNER   BOX BUTTE   CHEYENNE   DAWES   KIMBALL   MORRILL   SIOUX
     SCOTTS BLUFF

WCJIN-WYSE-WYNE

JLH
Special weather statement, Aug 3, 10:18 AM MDT, 5 hours 23 minutes before
NEZ001>003-019>021-054-055-031745-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1018 AM MDT SAT AUG 3 1996

CHEYENNE DOPPLER WEATHER RADAR SHOWED THAT THE LINE OF SHOWERS AND
WEAK THUNDERSTORMS WEAKENED EVEN MORE MOVING INTO WESTERN NEBRASKA.
INDEED AS OF 1000 AM MDT...THERE WERE ONLY LIGHT SHOWERS LEFT IN THIS
BAND AS ALL OF THE EARLIER WEAK THUNDERSTORMS HAD DISSIPATED.  THE BAND
OF LIGHT SHOWERS WILL CONTINUE EAST AND EXIT THE PANHANDLE ABOUT NOON.

JLH
Special weather statement, Aug 3, 2:21 PM MDT, 1 hour 20 minutes before
WYZ059>062-064-065-067-068-032105-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
220 PM MDT SAT AUG 3 1996

...THUNDERSTORMS WERE RUMBLING OVER PARTS OF SOUTHEAST WYOMING...

SCATTERED THUNDERSTORMS HAD DEVELOPED OVER SOUTHEAST WYOMING NORTH OF
INTERSTATE 80 EARLY THIS AFTERNOON.  MOST OF THE STORMS WERE ALONG AND
NORTH OF A LINE FROM RAWLINS TO TORRINGTON.  THE THUNDERSTORMS WERE
MOVING NORTHEAST AROUND 30 MPH.

AT 215 PM MDT...THE STRONGEST THUNDERSTORMS WERE LOCATED 15 MILES NORTH
OF WHEATLAND AND 30 MILES NORTHEAST OF DOUGLAS.  OTHER STRONG STORMS
WERE 25 MILES NORTHEAST AND 20 MILES NORTHWEST OF RAWLINS.  THESE
STRONGER THUNDERSTORMS WERE LIKELY PRODUCING WIND GUSTS BETWEEN 40 AND
50 MPH...DEADLY LIGHTNING AND POSSIBLY SOME SMALL HAIL.

THUNDERSTORMS WILL CONTINUE OVER SOUTHEAST WYOMING WELL INTO THE
EVENING HOURS.  PEOPLE IN SOUTHEAST WYOMING SHOULD BE ALERT FOR
THUNDERSTORM DEVELOPMENT.  BE READY TO SEEK SHE0LTER IF A STORM
APPROACHES YOUR LOCATION.

WCJIN-WYSE-WYNE

JLH
Special weather statement, Aug 3, 3:23 PM MDT, 18 minutes before
NEZ001-002-003-019-020-021-032230-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
322 PM MDT SAT AUG 3 1996

...THUNDERSTORMS WERE RUMBLING OVER PARTS OF THE NEBRASKA PANHANDLE...

SCATTERED THUNDERSTORMS HAD DEVELOPED OVER WESTERN NEBRASKA THIS
AFTERNOON.  MOST OF THE STORMS WERE ALONG AND NORTH OF A LINE FROM
SCOTTSBLUFF TO ALLIANCE.  THE THUNDERSTORMS WERE MOVING NORTHEAST AT 30
MPH.

AT 320 PM MDT...THE STRONGEST THUNDERSTORMS WERE LOCATED 35 MILES NORTH
OF SCOTTSBLUFF AND 55 MILES NORTH OF SCOTTSBLUFF.  THESE STRONGER
THUNDERSTORMS WERE LIKELY PRODUCING WIND GUSTS BETWEEN 40 AND 50
MPH...DEADLY LIGHTNING AND POSSIBLY SOME SMALL HAIL.

THUNDERSTORMS WILL CONTINUE OVER THE NEBRASKA PANHANDLE WELL INTO THE
EVENING HOURS.  PEOPLE IN WESTERN NEBRASKA SHOULD BE ALERT FOR
THUNDERSTORM DEVELOPMENT.  BE READY TO SEEK SHELTER IF A STORM
APPROACHES YOUR LOCATION.

ROBINSON

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 2, 7:56 PM MDTTornado WarningCYSBox Butte34 min
Aug 2, 8:02 PM MDTTornado WarningCYSBox Butte28 min
Aug 2, 8:13 PM MDTSevere Thunderstorm WarningCYSMorrill32 min
Aug 2, 8:30 PM MDTTornado WarningCYSBox Butte15 min
Aug 2, 8:30 PM MDTTornado WarningCYSMorrill30 min
Aug 2, 8:45 PM MDTTornado WarningCYSBox Butte15 min
Aug 3, 3:41 PM MDTSevere Thunderstorm WarningCYSSioux19 min
Aug 3, 4:05 PM MDTSevere Thunderstorm WarningCYSBox Butte25 min
Aug 3, 4:29 PM MDTSevere Thunderstorm WarningCYSBox Butte31 min
Aug 3, 5:15 PM MDTSevere Thunderstorm WarningCYSBox Butte45 min

Nearby

Flash Flood Warnings in Nebraska, 1996Every flash flood warning in 1996

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.