Alert archive / Montana / Flash Flood Warnings in 2011
Flash Flood Warning 2, NWS Great Falls, MT
NWS Great Falls, MT issued this flash flood warning at Jun 6, 2011, 7:41 PM MDT for Cascade County, Montana. It was in force for 6 hr. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 6, 2011, 7:41 PM MDT (01:41 UTC)
- Expired
- Jun 7, 2011, 1:45 AM MDT
- In force
- 6 hr
- Issued by
- NWS Great Falls, MT
- Area
- Storm-based polygon
- Flood severity
- None
County Cascade County, MT
The radar
The Great Falls radar (KTFX), 40 km from the middle of the area, began a volume at 01:41 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 6, 7:44 PM MDT | FLASH FLOOD | 8 Nnw Monarch, MT | CASCADE COUNTY FIRE HAVE CLOSED HIGHWAY 89 AT MILE MARKER 11 DUE TO FLOODING. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Great_falls, MT (KTFX), launched 00:00Z, 1.7 hours before the alert went out and 33 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
- 386 J/kg
- Mixed-layer CIN
- -53 J/kg
- Mixed-layer LCL
- 1661 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 72 m²/s²
- 0-3 km storm-relative helicity
- 277 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 5.0
The text
As transmitted, in the capitals the NWS used until 2016.
536 WGUS55 KTFX 070141 FFWTFX MTC013-070745- /O.NEW.KTFX.FF.W.0002.110607T0141Z-110607T0745Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE GREAT FALLS MT 741 PM MDT MON JUN 6 2011 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A * FLASH FLOOD WARNING FOR... EAST CENTRAL CASCADE COUNTY IN CENTRAL MONTANA... * UNTIL 145 AM MDT TUESDAY * AT 731 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. * LOCATIONS IN THE WARNING INCLUDE BELT. ESTIMATED RAINFALL AMOUNTS OF 2 TO 3 INCHES HAVE ALREADY FALLEN JUST SOUTH OF BELT AND EAST OF RAYNESFORD WITH AN ADDITIONAL 1 TO 2 INCHES POSSIBLE OVER THE NEXT FEW HOURS. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BELT PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. && LAT...LON 4745 11102 4741 11079 4700 11079 4704 11102 $$ SCHOTT
2 follow-up statements
200 WGUS55 KTFX 070144 CCA FFWTFX MTC013-070745- /O.COR.KTFX.FF.W.0002.110607T0141Z-110607T0745Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING...CORRECTED NATIONAL WEATHER SERVICE GREAT FALLS MT 741 PM MDT MON JUN 6 2011 THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A * FLASH FLOOD WARNING FOR... EAST CENTRAL CASCADE COUNTY IN CENTRAL MONTANA... * UNTIL 145 AM MDT TUESDAY * AT 731 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. * LOCATIONS IN THE WARNING INCLUDE BELT. ESTIMATED RAINFALL AMOUNTS OF 2 TO 3 INCHES HAVE ALREADY FALLEN JUST SOUTH OF BELT AND WEST OF RAYNESFORD WITH AN ADDITIONAL 1 TO 2 INCHES POSSIBLE OVER THE NEXT FEW HOURS. * LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BELT PRECAUTIONARY/PREPAREDNESS ACTIONS... EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL CREEKS AND STREAMS...COUNTRY ROADS...AS WELL AS FARMLAND ALONG THE BANKS OF CREEKS AND STREAMS. && LAT...LON 4745 11102 4741 11079 4700 11079 4704 11102 $$ SCHOTT
968 WGUS75 KTFX 070739 FFSTFX FLASH FLOOD STATEMENT NATIONAL WEATHER SERVICE GREAT FALLS MT 139 AM MDT TUE JUN 7 2011 MTC013-070746- /O.EXP.KTFX.FF.W.0002.000000T0000Z-110607T0745Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ CASCADE MT- 139 AM MDT TUE JUN 7 2011 ...THE FLASH FLOOD WARNING WILL EXPIRE AT 145 AM MDT FOR EAST CENTRAL CASCADE COUNTY... THE AREA OF VERY HEAVY RAINFALL OVER EAST CENTRAL CASCADE COUNTY HAS MOVED OFF TO THE NORTHEAST AND THE THREAT FOR FLASH FLOODING HAS DIMINISHED. HOWEVER...ADDITIONAL RAINFALL IS EXPECTED LATER TONIGHT THROUGH TOMORROW AND AREA CREEKS AND STREAMS WILL REMAIN VERY HIGH WITH SMALL STREAM FLOODING POSSIBLE...HOWEVER RAPID RISES ARE NO LONGER ANTICIPATED. LAT...LON 4745 11102 4741 11079 4700 11079 4704 11102 $$ HOENISCH
The office that day
Everything else NWS Great Falls, MT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 6, 6:13 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Teton | 47 min |
| Jun 6, 6:44 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Chouteau, Judith Basin | 46 min |
| Jun 6, 7:59 PM MDT | Severe Thunderstorm Warning | TFX | Cascade, Judith Basin, Meagher | 46 min |
| Jun 6, 11:04 PM MDT | River Flood Warning | TFX | Cascade | 10 days |
| Jun 7, 12:48 AM MDT | River Flood Watch | TFX | 25 hr | |
| Jun 7, 6:02 AM MDT | Areal Flood Warning | TFX | Glacier, Pondera, Teton | 10 days |
| Jun 7, 2:41 PM MDT | Areal Flood Warning | TFX | Jefferson, Lewis and Clark | 15 days |
| Jun 7, 3:45 PM MDT | River Flood Warning | TFX | Lewis and Clark | 4 days |
| Jun 7, 3:45 PM MDT | River Flood Warning | TFX | Toole | 10 days |
| Jun 7, 5:01 PM MDT | River Flood Warning | TFX | Gallatin | 31 days |
Nearby
Flash Flood Warnings in Montana, 2011Every flash flood warning in 2011
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.