Alert archive / Montana / Flash Flood Warnings in 1998

Flash Flood Warning 1, NWS Great Falls, MT

July 3, 1998Chouteau County, Fergus County, Judith Basin County, Montana

NWS Great Falls, MT issued this flash flood warning at Jul 3, 1998, 9:00 PM MDT for Chouteau County, Fergus County, Judith Basin County, Montana. 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 3, 1998, 9:00 PM MDT (03:00 UTC)
Expired
Jul 4, 1998, 12:00 AM MDT
In force
3 hr
Issued by
NWS Great Falls, MT
Area
Whole counties

Counties Chouteau County, MT, Fergus County, MT, Judith Basin County, MT

The radar

The Great Falls radar (KTFX), 106 km from the middle of the area, began a volume at 03:01 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 00:00Z, 3.0 hours before the alert went out and 48 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 00:00Z on 1998-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1560 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 00:00Z on 1998-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 58 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
1560 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
1121 m above ground
0-6 km bulk shear
49 kt
0-1 km storm-relative helicity
58 m²/s²
0-3 km storm-relative helicity
310 m²/s²
Significant tornado parameter
1.9
Supercell composite
8.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KGTF 040300
FFWGTF
MTC015-027-045-040600-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
900 PM MDT FRI JUL 3 1998

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CHOUTEAU COUNTY IN NORTH CENTRAL MONTANA
  FERGUS COUNTY IN CENTRAL MONTANA
  JUDITH BASIN COUNTY IN CENTRAL MONTANA

* UNTIL MIDNIGHT MDT

 THUNDERSTORMS ARE MOVING NORTH-NORTHEAST AT 25 TO 35 MPH.
THUNDERSTORMS ARE EXPECTED TO CONTINUE UNTIL MIDNIGHT. VERY HEAVY
RAIN ASSOCIATED WITH THESE THUNDERSTORMS WILL LIKELY BRING SMALL
STREAMS AND DRAINAGE AREAS ABOVE BANK FULL.

AN OBSERVER 5 MILES WEST OF CARTER AT 830 PM REPORTED MARBLE SIZE
HAIL AND 1 INCH OF RAIN FALL IN 15 MINUTES. NUMEROUS OTHER REPORTS
INDICATE HALF INCH TO ONE INCH OF RAINFALL IN A SHORT PERIOD OF
TIME.

PERSONS IN THE AFFECTED AREA LIVING NEAR SMALL STREAMS...GULLEYS
AND CANYONS SHOULD BE ALERT FOR RAPIDLY RISING WATER.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 3, 6:18 PM MDTSevere Thunderstorm WarningTFXPondera32 min
Jul 3, 6:33 PM MDTSevere Thunderstorm WarningTFXLewis and Clark32 min
Jul 3, 6:56 PM MDTSevere Thunderstorm WarningTFXJefferson34 min
Jul 3, 7:10 PM MDTSevere Thunderstorm WarningTFXGlacier35 min
Jul 3, 7:22 PM MDTSevere Thunderstorm WarningTFXCascade, Lewis and Clark43 min
Jul 3, 7:48 PM MDTSevere Thunderstorm WarningTFXCascade47 min
Jul 3, 7:57 PM MDTSevere Thunderstorm WarningTFXChouteau, Teton48 min
Jul 3, 8:01 PM MDTSevere Thunderstorm WarningTFXLewis and Clark59 min
Jul 3, 8:06 PM MDTSevere Thunderstorm WarningTFXMeagher29 min
Jul 3, 8:09 PM MDTSevere Thunderstorm WarningTFXFergus, Judith Basin61 min
Jul 3, 8:16 PM MDTSevere Thunderstorm WarningTFXLiberty, Pondera, Toole64 min
Jul 3, 8:17 PM MDTTornado WarningTFXCascade, Chouteau18 min
Jul 3, 8:36 PM MDTSevere Thunderstorm WarningTFXCascade, Chouteau, Teton49 min
Jul 3, 8:36 PM MDTSevere Thunderstorm WarningTFXLiberty, Pondera, Toole49 min
Jul 3, 8:39 PM MDTSevere Thunderstorm WarningTFXFergus, Judith Basin, Meagher51 min
Jul 3, 8:59 PM MDTTornado WarningTFXCascade, Meagher21 min
Jul 3, 9:06 PM MDTSevere Thunderstorm WarningTFXBroadwater, Jefferson49 min
Jul 3, 9:26 PM MDTSevere Thunderstorm WarningTFXChouteau, Fergus, Hill, Judith Basin, Liberty49 min
Jul 3, 9:30 PM MDTSevere Thunderstorm WarningTFXBroadwater, Meagher50 min
Jul 3, 10:07 PM MDTSevere Thunderstorm WarningTFXChouteau, Fergus, Judith Basin58 min
Jul 3, 10:07 PM MDTSevere Thunderstorm WarningTFXBlaine, Hill58 min
Jul 3, 10:40 PM MDTSevere Thunderstorm WarningTFXMeagher50 min
Jul 3, 11:10 PM MDTSevere Thunderstorm WarningTFXJudith Basin60 min
Jul 4, 12:15 AM MDTSevere Thunderstorm WarningTFXJudith Basin45 min
Jul 4, 2:42 PM MDTSevere Thunderstorm WarningTFXJudith Basin63 min
Jul 4, 4:04 PM MDTSevere Thunderstorm WarningTFXGallatin, Madison61 min
Jul 4, 4:27 PM MDTSevere Thunderstorm WarningTFXFergus63 min
Jul 4, 4:47 PM MDTSevere Thunderstorm WarningTFXGallatin48 min
Jul 4, 5:25 PM MDTSevere Thunderstorm WarningTFXCascade60 min
Jul 4, 5:29 PM MDTSevere Thunderstorm WarningTFXFergus51 min
Jul 4, 5:47 PM MDTSevere Thunderstorm WarningTFXMeagher63 min

Nearby

Flash Flood Warnings in Montana, 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.