Alert archive / Colorado / Flash Flood Warnings in 1998

Flash Flood Warning 20, NWS Goodland, KS

August 1, 1998Cheyenne County, Colorado

NWS Goodland, KS issued this flash flood warning at Aug 1, 1998, 7:40 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 1, 1998, 7:40 PM MDT (01:40 UTC)
Expired
Aug 1, 1998, 10:40 PM 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 01:44 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, 1.7 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-pSkew-T log-p diagram, Denver, CO at 00:00Z on 1998-08-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Denver, CO at 00:00Z on 1998-08-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1720 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
-24 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 KGLD 020139
FFWGLD
COC017-020440-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GOODLAND KS
740 PM MDT SAT AUG 1 1998

THE NATIONAL WEATHER SERVICE IN GOODLAND HAS ISSUED A

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

* UNTIL 1040 PM MDT

* AT 730 PM MDT...LAW ENFORCEMENT OFFICIALS REPORTED FLOODING AROUND
  AND EAST OF CHEYENNE WELLS. HIGHWAYS ARE BECOMING INUNDATED AND
  DITCHES ARE FILLING QUICKLY.

* WATER OVER ROADS AND HIGHWAYS EAST OF CHEYENNE WELLS CAN BE
  EXPECTED THROUGH 1030 PM MDT. THIS IS A VERY DANGEROUS SITUATION.


DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD!

THEDE


&

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 1, 2:09 PM MDT, 5 hours 31 minutes earlier.

Area forecast discussion, Aug 1, 2:09 PM MDT, 5 hours 31 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GOODLAND KS
209 PM MDT (309 PM CDT) SAT AUG 1 1998

...LOTS OF CHALLENGES THIS FORECAST PACKAGE...

NONE OF THE MODELS DID ESPECIALLY WELL AT THE SFC...HOWEVER MM5 AND
RUC CLOSEST TO REALITY. ETA DOES COME INTO MORE AGREEMENT WITH MM5
IN LATER PERIODS. ETA WAS ALSO ONLY MODELS THAT REALLY CAUGHT 5H LOW
OVER SW KS AT 12Z.

.SHORT TERM...
CONCERNS CENTER ON POTENTIAL FOR SEVERE WEATHER OVER NW ZONES AND
POSSIBLE FLOODING EAST. OVER THE WEST...ATMOSPHERE OVER ERN PLAINS
OF CO HAVE BECOME QUITE UNSTABLE WITH DERIVED CAPES OF 2500-3000
J/KG ALONG WITH SFC DEWPOINTS IN THE 60S IN UPSLOPE FLOW. WV IMAGERY
SHOWING S/W AND ASSOCIATED JET STREAK MOVING THROUGH CO ATTM AND
WITH LEE TROF PROGGED TO DEEPEN...RESULTING IN INCREASING LOW LEVEL
CONVERGENCE...EXPECT THUNDERSTORM ACTIVITY TO BECOME MORE WIDESPREAD
THIS EVENING. ALL SAID..CANNOT ARGUE WITH SPC ON WATCH FOR NERN CO.

RR QUAD OF MID TO UPPER LEVEL JET TO SLIDE INTO NW KS OVERNIGHT
ENHANCING LIFT OVER EASTERN SECTIONS OF FA WHERE SFC BOUNDARY IS
EXPECTED TO LIFT INTO THIS AREA LATER ON. 70 DEWPOINTS WILL ADVECT
FURTHER INTO THE FA IN SERLY FLOW. ATMOSPHERE TO BE MORE STABLE WITH
CAPES OF 1000-1500 J/KG. THE BIG CONCERN IS THE POTENTIAL FOR VERY
HEAVY RAINS AS PW/S IN EXCESS OF 1 INCH. MINOR FLOODING IS ALREADY
OCCURING OVER DECATUR COUNTY THIS AFTERNOON ON SAPPA CREEK...AND ANY
ADDITIONAL RAINFALL WILL ONLY ADD TO THE PROBLEMS THERE. THE
AFOREMENTIONED WEAK S/W OVER SW KS MAY START THE ACTIVITY THIS
EVENING...BUT BEST BET IS LATE TONIGHT WITH APPROACH OF MAIN SYSTEM.
WILL HOLD OFF ON ISSUING FLASH OR FLOOD WATCH ATTM AS THE HEAVIEST
RAINS SHOULD OCCUR LATE.

.LONG TERM...
5H TROF MOVES INTO THE NRN PLAINS SUNDAY WITH A NUMBER OF WEAK
IMPULSES SWINGING THROUGH THE BASE...BUT TIMING OF THESE FEATURES
UNCERTAIN. THIS WILL KEEP A POTENTIAL FOR CONVECTIVE ACTIVITY
GOING...BUT WITH DRIER AIR MOVING IN FROM THE WEST HAVE KEPT POPS
LOW. SFC HIGH TO START PUSHING COOLER AIR INTO THE REGION SUNDAY
NIGHT WHICH SHOULD TRIGGER SHOWERS AND THUNDERSTORMS ONCE AGAIN. ETA
850-700 THICKNESS ANALYSIS SUGGESTS FRONT MAY NOT QUITE MAKE IT
THROUGH SRN FA...AND HAVE GENERALLY KEPT TEMPS WARMER THERE.
OTHERWISE...FWC/FAN NUMBERS ACCEPTED FOR THIS PACKAGE.

.GLD...NONE.

TURNER

In the hours before

Special weather statement, Aug 1, 6:47 PM MDT, 53 minutes before
COZ090-091-020125-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE GOODLAND KS
647 PM MDT SAT AUG 1 1998

...THE SEVERE THUNDERSTORM WATCH WILL BE ALLOWED TO EXPIRE AT 7 PM...

A LINE OF THUNDERSTORMS ARE MOVING OUT OF FAR EASTERN COLORADO AND
INTO NORTHWEST KANSAS THIS EVENING. THE THREAT FOR SEVERE WEATHER
WILL BE OVER FOR YUMA AND KIT CARSON COUNTIES AFTER 7 PM MDT. A FEW
SHOWERS OR THUNDERSTORMS ARE STILL POSSIBLE FOR THE REST OF THE
EVENING. TUNE IN NOAA WEATHER RADIO OR YOUR LOCAL RADIO OR TV STATION
FOR THE LATEST WEATHER INFORMATION.

KPL

The office that day

Everything else NWS Goodland, KS issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 1, 7:03 PM MDTSevere Thunderstorm WarningGLDCheyenne32 min
Aug 1, 7:33 PM MDTSevere Thunderstorm WarningGLDCheyenne32 min

Nearby

Flash Flood Warnings in Colorado, 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.