Alert archive / Montana / Flash Flood Warnings in 2002
Flash Flood Warning 3, NWS Great Falls, MT
NWS Great Falls, MT issued this flash flood warning at Aug 21, 2002, 8:05 PM MDT for Lewis and Clark County, Montana. It was in force for 115 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 21, 2002, 8:05 PM MDT (02:05 UTC)
- Expired
- Aug 21, 2002, 10:00 PM MDT
- In force
- 115 min
- Issued by
- NWS Great Falls, MT
- Area
- Counties, with a storm outline in the text
County Lewis and Clark County, MT
The radar
The Great Falls radar (KTFX), 80 km from the middle of the area, began a volume at 02:04 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, 2.1 hours before the alert went out and 119 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.
- Mixed-layer CAPE
- 280 J/kg
- Mixed-layer CIN
- -17 J/kg
- Mixed-layer LCL
- 1156 m above ground
- 0-6 km bulk shear
- 32 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WGUS55 KTFX 220205 FFWTFX MTC049-220400- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 804 PM MDT WED AUG 21 2002 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A * FLASH FLOOD WARNING FOR... CAVE GULCH BURN AREA ON THE NORTHEAST END OF CANYON FERRY RESERVOIR * UNTIL 1000 PM MDT * AT 800 PM MDT...WEATHER SERVICE RADAR INDICATED VERY HEAVY RAIN OVER EXTREME SOUTHEASTERN LEWIS AND CLARK COUNTY...OR ABOUT 17 MILES NORTHEAST OF HELENA. THE HEAVY RAIN IS FALLING OVER THE CAVE GULCH BURN AREA ON THE NORTHEAST SIDE OF CANYON FERRY RESERVOIR. THIS AREA IS SUBJECT TO DEBRIS FLOWS AND FLASH FLOODS DURING PERIODS OF HEAVY RAIN. A FLASH FLOOD WARNING MEANS THAT FLOODING OR DEBRIS FLOWS ARE IMMINENT OR OCCURRING. IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY. RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK HIGHER GROUND. TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN GREAT FALLS. LAT...LON 4674 11191 4681 11169 4696 11192
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 7:44 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater | 31 min |
| Aug 21, 8:25 PM MDT | Severe Thunderstorm Warning | TFX | Broadwater, Meagher | 35 min |
| Aug 22, 4:46 PM MDT | Severe Thunderstorm Warning | TFX | Judith Basin | 59 min |
| Aug 22, 5:10 PM MDT | Severe Thunderstorm Warning | TFX | Fergus | 65 min |
Nearby
Flash Flood Warnings in Montana, 2002Every flash flood warning in 2002
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.