Alert archive / Montana / Flash Flood Warnings in 2016

Flash Flood Warning 2, NWS Great Falls, MT

August 10, 2016Cascade County, Chouteau County, Montana

NWS Great Falls, MT issued this flash flood warning at Aug 10, 2016, 12:10 AM MDT for Cascade County, Chouteau County, Montana. It was in force for 65 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 10, 2016, 12:10 AM MDT (06:10 UTC)
Expired: Aug 10, 2016, 1:15 AM MDT
In force: 65 min
Issued by: NWS Great Falls, MT
Area: Storm-based polygon
Flood severity: None

Counties Cascade County, MT, Chouteau County, MT

The radar

The Great Falls radar (KTFX), 21 km from the middle of the area, began a volume at 06:12 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

Glasgow Intl Airport, MT (KGGW), launched 00:00Z, 6.2 hours before the alert went out and 346 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 242 J/kg
Mixed-layer CIN: -260 J/kg
Mixed-layer LCL: 2412 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: 191 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

375 
WGUS55 KTFX 100610
FFWTFX
MTC013-015-100715-
/O.NEW.KTFX.FF.W.0002.160810T0610Z-160810T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE GREAT FALLS MT
1210 AM MDT WED AUG 10 2016

THE NATIONAL WEATHER SERVICE IN GREAT FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN CHOUTEAU COUNTY IN NORTH CENTRAL MONTANA...
  NORTHEASTERN CASCADE COUNTY IN CENTRAL MONTANA...

* UNTIL 115 AM MDT

* AT 1209 AM MDT...THE PUBLIC REPORTED FLASH FLOODING ACROSS THE
  WARNED AREA. FLASH FLOODING IS ALREADY OCCURRING.

* SOME LOCATIONS THAT WILL EXPERIENCE FLOODING INCLUDE...
  GREAT FALLS...BLACK EAGLE...TRACY...MALMSTROM AFB AND SAND COULEE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF URBAN
AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER DRAINAGE
AREAS AND LOW LYING SPOTS.

&&

LAT...LON 4759 11092 4741 11086 4739 11148 4762 11144

$$

1 follow-up statement

050 
WGUS75 KTFX 100718
FFSTFX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE GREAT FALLS MT
118 AM MDT WED AUG 10 2016

MTC013-015-100726-
/O.EXP.KTFX.FF.W.0002.000000T0000Z-160810T0715Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CHOUTEAU MT-CASCADE MT-
118 AM MDT WED AUG 10 2016

...THE FLASH FLOOD WARNING FOR SOUTHWESTERN CHOUTEAU AND NORTHEASTERN
CASCADE COUNTIES HAS EXPIRED...

HEAVY RAIN HAS ENDED AND FLOOD WATERS HAVE RECEDED. FLASH FLOODING
IS NO LONGER EXPECTED TO POSE A THREAT. PLEASE CONTINUE TO HEED ANY
REMAINING ROAD CLOSURES.

LAT...LON 4759 11092 4741 11086 4739 11148 4762 11144

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 9, 6:00 PM MDT	Special Weather Statement	TFX	Broadwater	30 min
Aug 9, 6:05 PM MDT	Special Weather Statement	TFX	Chouteau	40 min
Aug 9, 6:12 PM MDT	Special Weather Statement	TFX	Cascade	48 min
Aug 9, 6:16 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Judith Basin	29 min
Aug 9, 6:22 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau	38 min
Aug 9, 6:24 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Fergus, Judith Basin	51 min
Aug 9, 6:41 PM MDT	Areal Flood Advisory	TFX	Cascade	49 min
Aug 9, 6:48 PM MDT	Special Weather Statement	TFX	Fergus	42 min
Aug 9, 6:50 PM MDT	Flash Flood Warning	TFX	Cascade	115 min
Aug 9, 6:54 PM MDT	Special Weather Statement	TFX	Chouteau	51 min
Aug 9, 6:58 PM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Fergus, Judith Basin	47 min
Aug 9, 7:15 PM MDT	Special Weather Statement	TFX	Fergus	45 min
Aug 9, 7:39 PM MDT	Severe Thunderstorm Warning	TFX	Fergus	36 min
Aug 9, 8:08 PM MDT	Severe Thunderstorm Warning	TFX	Blaine, Fergus	67 min
Aug 9, 8:15 PM MDT	Special Weather Statement	TFX	Hill	45 min
Aug 9, 9:00 PM MDT	Special Weather Statement	TFX	Hill	45 min
Aug 9, 10:25 PM MDT	Special Weather Statement	TFX	Lewis and Clark	35 min
Aug 9, 10:53 PM MDT	Special Weather Statement	TFX	Cascade	52 min
Aug 9, 11:12 PM MDT	Special Weather Statement	TFX	Meagher	48 min
Aug 9, 11:45 PM MDT	Special Weather Statement	TFX	Cascade	45 min
Aug 9, 11:45 PM MDT	Severe Thunderstorm Warning	TFX	Cascade, Judith Basin, Meagher	30 min
Aug 10, 12:08 AM MDT	Severe Thunderstorm Warning	TFX	Cascade, Chouteau, Pondera, Teton	37 min
Aug 10, 12:32 AM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Judith Basin	28 min
Aug 10, 12:52 AM MDT	Special Weather Statement	TFX	Chouteau	38 min
Aug 10, 12:58 AM MDT	Severe Thunderstorm Warning	TFX	Chouteau, Fergus	32 min
Aug 10, 1:30 AM MDT	Severe Thunderstorm Warning	TFX	Blaine, Chouteau, Fergus	30 min
Aug 10, 1:57 AM MDT	Severe Thunderstorm Warning	TFX	Blaine, Fergus	63 min

Nearby

Flash Flood Warnings in Montana, 2016 Every flash flood warning in 2016

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.