Alert archive / Colorado / Flash Flood Warnings in 1998

Flash Flood Warning 23, NWS Goodland, KS

August 11, 1998Cheyenne County, Colorado

NWS Goodland, KS issued this flash flood warning at Aug 11, 1998, 10:32 PM MDT for Cheyenne County, Colorado. It was in force for 3 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: Aug 11, 1998, 10:32 PM MDT (04:32 UTC)
Expired: Aug 12, 1998, 1:25 AM MDT
In force: 3 hr
Issued by: NWS Goodland, KS
Area: Whole counties

County Cheyenne County, CO

The radar

The Goodland radar (KGLD), 98 km from the middle of the area, began a volume at 04:35 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 00:00Z, 4.5 hours before the alert went out and 128 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: 174 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 2431 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 8 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KGLD 120433
FFWGLD
COC017-120725-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GOODLAND KS
1032 PM MDT TUE AUG 11 1998

THE NATIONAL WEATHER SERVICE IN GOODLAND HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CHEYENNE COUNTY COLORADO IN EAST CENTRAL COLORADO

* UNTIL 125 AM MDT

* AT 1020 PM MDT...LAW ENFORCEMENT OFFICIALS REPORTED 10 INCHES OF
  WATER CROSSING HIGHWAY 40...1/2 MILE EAST OF CHEYENNE WELLS.
  DOPPLER RADAR ALSO INDICATED THAT THUNDERSTORMS HAD PRODUCED A
  SWATH OF 3/4 TO 1 INCH RAINS FROM 5 MILES NORTH OF AROYA TO 5
  MILES NORTH OF KIT CARSON TO CHEYENNE WELLS. THE THUNDERSTORMS
  WERE MOVING SLOWLY EAST.

* PERSONS ALONG THE EUREKA AND WILD HORSE CREEKS SHOULD WATCH FOR
  RISING WATERS...AND BE PREPARED TO MOVE TO HIGHER GROUND. ALSO...
  THOSE ALONG THE SMOKY HILL RIVER FROM NORTH OF CHEYENNE WELLS TO
  THE KANSAS LINE WILL NEED TO CLOSELY MONITOR CONDITIONS FOR RISING
  WATER.

NEVER DRIVE INTO AREAS WHERE WATER COVERS THE ROAD!

STAVISH


&

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.

NWS Goodland, KS wrote its last area forecast discussion before this flash flood warning went out at Aug 11, 1:30 PM MDT, 9 hours 2 minutes earlier.

Area forecast discussion, Aug 11, 1:30 PM MDT, 9 hours 2 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GOODLAND KS
130 PM MDT (230 PM CDT) TUE AUG 11 1998

...MODEL INTERPRETATIONS OF TRANSITIONAL SUB-SYNOPTIC FLOW OVER
   THIS CWA SEEMS A TYPICAL FORECAST DILEMNA ON MY SHIFTS...

   BASED ON SFC OBS AT 18Z AND VIS SATL...YOU CAN PICK OUT THE
STATIONARY FRONT STRUNG OUT ALONG I-70 FROM HYS TO GLD AND THEN NNWD
TO SNY. TIMING SHORTWAVE ENERGY AND SUBSEQUENT POP CHCS HAS BEEN
LESS MODEL DRIVEN AND MORE NOWCASTING THRU FIRST 12 HOURS. IT LOOKS
AS IF NOTHING HAS CHANGED.
   DIGGING SHORTWAVE AND ASSOCIATED TROUGH ON WV LOOP EXTENDING FROM
SRN NV...NEWD TO CYS AND INTO LOW OVER WRN SD IS GOING TO TRANSLATE
DOWN TO H7 LEVEL WITH SOMEWHAT MORE STRENGTH...STRONGER WNWLY FLOW
AND COOLER H7 AIR THAN THE MODELS SHOW BY 12/12Z OVER CWA. IT WILL
BE THE MAIN FOCUS FOR POPS AND IS PROBABLY TOO FAR SOUTH BY 36 HRS
THAN MODELS PREDICT. THE NGM IGNORES THIS SHORTWAVE AND FOCUSES MORE
ON THE ONE OVER SWRN OREGON AT H5 ANYWAY. AGREE THAT H7 THERMAL
TROUGH WILL BE DRAPED WEST TO EAST ACROSS CWA ON WEDNESDAY AND
THAT NEITHER MODEL IS CORRECT WITH DIFFUSE DEFORMATION ZONE
SAGGING VERY SLOWLY SWD ALONG AND JUST SOUTH OF I-70 AFT 06Z.
   WHAT WILL BE MOST DIFFICULT FOR LATER SHIFTS TO MONITOR...IS TO
ALLOW THE TEMP GRADIENTS AND POPS TO DEVELOP FROM SW TO NE ACROSS
CWA IN THE AFTN WED. SINCE THIS IS A FORECAST AND DOES NOT
NECESSARILY MIRROR MODEL GUIDANCE...
   I WOULD EXPECT SOME SUN IN SW ZONES WEDNESDAY AFTN WITH WEAK AND
BRIEF SFC LOW FORMATION ALONG STATIONARY FRONT DESCENDING SOUTH FROM
AKO TO TRB....ALLOWING FOR TCU AND SC WITH H7 THERMAL TROF STRUNG
OUT WEST TO EAST ALONG KS/OKLA BORDER WEDNESDAY EVENING...NOT ALONG
RED RIVER AS MODELS SUGGEST THIS RUN.

.GLD...FLASH FLOOD WATCH CONTINUES UNTIL 12/09Z FOR EXTREME EAST
       CENTRAL COLORADO...COZ090>092.

VOJTESAK

Nearby

Flash Flood Warnings in Colorado, 1998 Every 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.