Alert archive / Wyoming / Flash Flood Warnings in 1997

Flash Flood Warning 8, NWS Cheyenne, WY

July 29, 1997Goshen County, Wyoming

NWS Cheyenne, WY issued this flash flood warning at Jul 29, 1997, 9:25 PM MDT for Goshen County, Wyoming. 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
Jul 29, 1997, 9:25 PM MDT (03:25 UTC)
Expired
Jul 30, 1997, 12:00 AM MDT
In force
3 hr
Issued by
NWS Cheyenne, WY
Area
Whole counties

County Goshen County, WY

The radar

The Cheyenne radar (KCYS), 111 km from the middle of the area, began a volume at 03:29 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 00:00Z, 3.4 hours before the alert went out and 251 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 00:00Z on 1997-07-30Temperature 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°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 00:00Z on 1997-07-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.193958Sfc1 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
496 m above ground
0-6 km bulk shear
33 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
160 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 300325
FFWCYS
WYC015-300555-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
925 PM MDT TUE JUL 29 1997

* FLASH FLOOD WARNING FOR
  NORTHWESTERN GOSHEN COUNTY IN SOUTHEASTERN WYOMING

* UNTIL MIDNIGHT MDT

* THE WARNING IS MAINLY IN RURAL AREAS IN THE COTTONWOOD CREEK
  DRAINAGE.

* CAUSE AND EFFECT
  RADAR HAS INDICATED ABOUT 2 TO 4 INCHES OF RAINFALL IN THIS AREA
  SINCE 730 PM.  THE GOSHEN COUNTY SHERIFF/S OFFICE RECEIVED A REPORT
  FROM A RANCHER OF 2 TO 4 FEET OF WATER FLOWING OVER SOME COUNTY
  ROADS NORTH OF FT. LARAMIE.  THIS AREA IS ABOUT 25 TO 30 MILES
  NORTHWEST OF TORRINGTON.

THE STORM THAT CAUSED THE FLASH FLOODING WAS PICKING UP SPEED AS IT
MOVED ACROSS NORTH CENTRAL GOSHEN COUNTY AT 920 PM.  IT WAS LOCATED
ABOUT 20 TO 25 MILES NORTHWEST OF TORRINGTON AND MOVING SOUTHEAST
AROUND 15 MPH...PUTTING OUT ABOUT 1 TO 1.5 INCHES OF RAIN PER HOUR.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN ITd IS HARDER TO RECOGNIZE THE
DANGERS OF FLASH FLOODING.

WCJIN-WYSE

JAD

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, 6:17 PM MDT, 3 hours 8 minutes before
WYZ059-060-300115-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
617 PM MDT TUE JUL 29 1997

...A STRONG THUNDERSTORM WITH HEAVY RAIN WAS MOVING ACROSS SOUTHEAST
CONVERSE COUNTY AT 610 PM...

THE STORM WAS LOCATED ABOUT 10 MILES EAST SOUTHEAST OF DOUGLAS AND
WAS DRIFTING EAST AROUND 10 TO 15 MPH.  IT HAS PRODUCED HEAVY RAIN
IN AND JUST SOUTH OF DOUGLAS WITH LOCALIZED FLOODING OF CREEKS ALONG
ESTERBROOK ROAD.  THIS STORM ALSO STILL CONTAINED SOME ROTATION IN
IT...AND MAY BE ABLE TO PRODUCE ANOTHER BRIEF FUNNEL CLOUD.

PEOPLE IN FAR SOUTHEAST CONVERSE AND FAR SOUTHWEST NIOBRARA COUNTIES
SHOULD BE ON THE LOOKOUT FOR THIS STORM.  ON ITS PRESENT TRACK IT WILL
CROSS AN AREA ALONG THE NIOBRARA-CONVERSE COUNTY LINE JUST SOUTH OF
HIGHWAY 18/20 THAT ALREADY RECEIVED HEAVY RAIN EARLIER TODAY.  LOCAL
FLOODING OF STREAM AND DITCHES COULD EASILY OCCUR.

WCJIN-WYNE

JAD

Nearby

Flash Flood Warnings in Wyoming, 1997Every flash flood 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.