Alert archive / Montana / Flash Flood Warnings in 2011

Flash Flood Warning 2, NWS Missoula, MT

February 3, 2011Missoula County, Montana

NWS Missoula, MT issued this flash flood warning at Feb 3, 2011, 4:41 PM MST for Missoula County, Montana. It was in force for 46 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
Feb 3, 2011, 4:41 PM MST (23:41 UTC)
Expired
Feb 3, 2011, 5:27 PM MST
In force
46 min
Issued by
NWS Missoula, MT
Area
Storm-based polygon
Flood severity
None

County Missoula County, MT

The radar

The Missoula radar (KMSX), 9 km from the middle of the area, began a volume at 23:47 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

Spokane, WA (KOTX), launched 12:00Z, 11.7 hours before the alert went out and 203 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, Spokane, WA at 12:00Z on 2011-02-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Spokane, WA at 12:00Z on 2011-02-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 93 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1737 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
93 m²/s²
0-3 km storm-relative helicity
158 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.

810 
WGUS55 KMSO 032341
FFWMSO
MTC063-040145-
/O.NEW.KMSO.FF.W.0002.110203T2341Z-110204T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
441 PM MST THU FEB 3 2011

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  RATTLESNAKE CREEK IN MISSOULA COUNTY OF WEST CENTRAL MONTANA...

* UNTIL 645 PM MST.

* AT 430 PM MST...LAW ENFORCEMENT OFFICIALS REPORTED AN ICE JAM      
  BREAK ON RATTLESNAKE CREEK. TREES AND LOGS AND ICE ARE MOVING AT A 
  FAST RATE DOWN THE CREEK TOWARD THE CITY OF MISSOULA. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING IS 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 DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

&&

LAT...LON 4711 11396 4702 11382 4690 11382 4690 11391
      4685 11400 4696 11397

$$
1 follow-up statement
436 
WGUS75 KMSO 040027
FFSMSO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
527 PM MST THU FEB 3 2011

MTC063-040035-
/O.CAN.KMSO.FF.W.0002.000000T0000Z-110204T0145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MISSOULA MT-
527 PM MST THU FEB 3 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR THE RATTLESNAKE 
CREEK IN CENTRAL MISSOULA COUNTY...

SHERIFF REPORTS THE WATER HAS CRESTED AND REMAINS IN THE BANKS OF 
THE RATTLESNAKE CREEK. THERE HAS BEEN NO PROPERTY DAMAGE. THUS THE 
FLASH FLOOD WARNING HAS BEEN CANCELLED.  

LAT...LON 4711 11396 4702 11382 4690 11382 4690 11391
      4685 11400 4696 11397

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Feb 3, 1:32 PM MSTWinter Weather AdvisoryMSOFlathead, Granite, Lake, Mineral, Missoula, Powell and 2 more30 hr

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.