Alert archive / Montana / Flash Flood Warnings in 1997

Flash Flood Warning 5, NWS Great Falls, MT

June 11, 1997Cascade County, Judith Basin County, Montana

NWS Great Falls, MT issued this flash flood warning at Jun 11, 1997, 2:30 PM MDT for Cascade County, Judith Basin County, Montana. It was in force for 7 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
Jun 11, 1997, 2:30 PM MDT (20:30 UTC)
Expired
Jun 11, 1997, 9:00 PM MDT
In force
7 hr
Issued by
NWS Great Falls, MT
Area
Whole counties

Counties Cascade County, MT, Judith Basin County, MT

The radar

The Great Falls radar (KTFX), 54 km from the middle of the area, began a volume at 20:33 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

Great_falls, MT (KTFX), launched 12:00Z, 8.5 hours before the alert went out and 35 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, Great_falls, MT at 12:00Z on 1997-06-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 41 joules per kilogram.LCLEL10008507005003002001001 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, Great_falls, MT at 12:00Z on 1997-06-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 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
41 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
494 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
78 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 KGTF 112035 RRA
FFWGTF
MTC013-045-120900-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTION
NATIONAL WEATHER SERVICE GREAT FALLS MT
230 PM MDT WED JUN 11 1997
 
THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  900 PM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN NORTH MONTANA
 
   ...EASTERN CASCADE AND WESTERN JUDITH BASIN COUNTY
 
HEAVY RAINFALL HAS DEVELOPED WITH SLOW MOVING THUNDERSTORMS OVER EASTERN
CASCADE AND WESTERN JUDITH BASIN COUNTIES...PARTICULARLY BETWEEN BELT
AND MONARCH. PERSONS LIVING NEAR AND ALONG CANYONS AND COULEES IN THE
THIS AREA SHOULD WATCH FOR RAPIDLY RISING WATERS.

The office that day

Everything else NWS Great Falls, MT issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jun 11, 2:21 PM MDTSevere Thunderstorm WarningTFXChouteau39 min

Nearby

Flash Flood Warnings in Montana, 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.