Alert archive / Nebraska / Flash Flood Warnings in 1998

Flash Flood Warning 3, NWS Cheyenne, WY

July 29, 1998Kimball County, Nebraska

NWS Cheyenne, WY issued this flash flood warning at Jul 29, 1998, 2:09 PM MDT for Kimball County, Nebraska. It was in force for 4 hr. 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 29, 1998, 2:09 PM MDT (20:09 UTC)
Expired
Jul 29, 1998, 6:10 PM MDT
In force
4 hr
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Kimball County, NE

The radar

The Cheyenne radar (KCYS), 91 km from the middle of the area, began a volume at 20:11 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

Denver, CO (KDNR), launched 12:00Z, 8.2 hours before the alert went out and 153 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, Denver, CO at 12:00Z on 1998-07-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 1998-07-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.1939Sfc1 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
2 J/kg
Mixed-layer CIN
-231 J/kg
Mixed-layer LCL
1470 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
34 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KCYS 292010
FFWCYS
NEC105-300010-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
209 PM MDT WED JUL 29 1998

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  KIMBALL COUNTY IN THE NEBRASKA PANHANDLE

* UNTIL 610 PM MDT

* AT 205 PM MDT... NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  THUNDERSTORM WITH VERY HEAVY RAIN FROM KIMBALL TO 18 MILES SOUTHWEST
  OF KIMBALL... MOVING SLOWLY EAST.

* A USAF SITE IN THIS AREA RECORDED 1.32 INCHES OF RAIN SINCE
  1 PM.  DOPPLER RADAR ESTIMATES MORE THAN 4 INCHES OF RAIN 14 MILES
  SOUTHWEST OF KIMBALL SINCE 1230 PM.

DO NOT DRIVE THROUGH FLOODED AREAS. SHALLOW...SWIFTLY FLOWIN
G WATER
CAN WASH A CAR FROM A ROADWAY.  ALSO...THE ROADBED MAY NOT BE
INTACT UNDER THE WATER.

SULLIVAN

&

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, Jul 29, 10:03 AM MDT, 4 hours 6 minutes before
NEZ001>003-019>021-054-055-WYZ059>070-300000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1003 AM MDT WED JUL 29 1998

THE SEVERE WEATHER POTENTIAL IN SOUTHEAST WYOMING AND THE WESTERN
NEBRASKA PANHANDLE WILL BE LOW TODAY.

SPOTTER ACTIVATION WILL NOT BE NECESSARY.

DISCUSSION...A WEAK UPPER LEVEL DISTURBANCE WILL MOVE FROM
CENTRAL WYOMING TO WESTERN NEBRASKA BY THIS EVENING.  WITH
INCREASED MOISTURE OVER THE STATE...THUNDERSTORM CHANCES OVER THE
EASTERN PART OF THE STATE AND WESTERN NEBRASKA WILL INCREASE.
INSTABILITIES OVER SOUTHEAST WYOMING AND THE WESTERN NEBRASKA
PANHANDLE WILL BE MODERATE TODAY...HOWEVER WARM TEMPERATURES ALOFT
WILL KEEP THUNDERSTORMS FROM BECOMIN"G VERY STRONG. THUNDERSTORMS THAT
DEVELOP TODAY WILL BE SLOW MOVING. VERY HEAVY RAIN...SMALL HAIL...AND
GUSTS TO 40 MPH ARE POSSIBLE WITH THE STORMS THIS AFTERNOON AND
EVENING.

WCJIN-WYSE-WYNE

LRE
Special weather statement, Jul 29, 10:03 AM MDT, 4 hours 6 minutes before
NEZ001>003-019>021-054-055-WYZ059>070-300000-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
1003 AM MDT WED JUL 29 1998

THE SEVERE WEATHER POTENTIAL IN SOUTHEAST WYOMING AND THE WESTERN
NEBRASKA PANHANDLE WILL BE LOW TODAY.

SPOTTER ACTIVATION WILL NOT BE NECESSARY.

DISCUSSION...A WEAK UPPER LEVEL DISTURBANCE WILL MOVE FROM
CENTRAL WYOMING TO WESTERN NEBRASKA BY THIS EVENING.  WITH
INCREASED MOISTURE OVER THE STATE...THUNDERSTORM CHANCES OVER THE
EASTERN PART OF THE STATE AND WESTERN NEBRASKA WILL INCREASE.
INSTABILITIES OVER SOUTHEAST WYOMING AND THE WESTERN NEBRASKA
PANHANDLE WILL BE MODERATE TODAY...HOWEVER WARM TEMPERATURES ALOFT
WILL KEEP THUNDERSTORMS FROM BECOMIN"G VERY STRONG. THUNDERSTORMS THAT
DEVELOP TODAY WILL BE SLOW MOVING. VERY HEAVY RAIN...SMALL HAIL...AND
GUSTS TO 40 MPH ARE POSSIBLE WITH THE STORMS THIS AFTERNOON AND
EVENING.

WCJIN-WYSE-WYNE

LRE

Nearby

Flash Flood Warnings in Nebraska, 1998Every flash flood warning in 1998

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.