Alert archive / Montana / Flash Flood Warnings in 2012

Flash Flood Warning 6, NWS Missoula, MT

July 27, 2012Missoula County, Montana

NWS Missoula, MT issued this flash flood warning at Jul 27, 2012, 3:54 PM MDT for Missoula County, Montana. It was in force for 73 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
Jul 27, 2012, 3:54 PM MDT (21:54 UTC)
Expired
Jul 27, 2012, 5:07 PM MDT
In force
73 min
Issued by
NWS Missoula, MT
Area
Storm-based polygon
Flood severity
None

County Missoula County, MT

The nearest sounding before it

Spokane, WA (KOTX), launched 12:00Z, 9.9 hours before the alert went out and 207 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 2012-07-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 8 joules per kilogram.LCLLFCEL10008507005003002001001 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 2012-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 25 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
8 J/kg
Mixed-layer CIN
-289 J/kg
Mixed-layer LCL
2196 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
25 m²/s²
0-3 km storm-relative helicity
75 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.

451 
WGUS55 KMSO 272154
FFWMSO
MTC063-280000-
/O.NEW.KMSO.FF.W.0006.120727T2154Z-120728T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
354 PM MDT FRI JUL 27 2012

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  BONNER...EAST MISSOULA...WEST RIVERSIDE BURN AREA IN
  CENTRAL MISSOULA COUNTY IN WEST CENTRAL MONTANA...

* UNTIL 600 PM MDT.

* AT 348 PM MDT...WEATHER SPOTTERS REPORTED FLASH FLOODING OVER THE
  WARNED AREA.

* LOCATIONS IMPACTED INCLUDE...BONNER...EAST MISSOULA...TURAH AND
  WEST RIVERSIDE BURN AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A FLASH FLOOD WARNING MEANS THAT FLOODING...MUD AND 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.

&&

LAT...LON 4698 11399 4697 11381 4681 11379 4680 11398

$$
2 follow-up statements
437 
WGUS75 KMSO 272306
FFSMSO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
506 PM MDT FRI JUL 27 2012

MTC063-272314-
/O.CAN.KMSO.FF.W.0006.000000T0000Z-120728T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MISSOULA MT-
506 PM MDT FRI JUL 27 2012

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

THE STRONG STORM THAT PRODUCED RAINFALL OF 0.45 INCHES IN 10 MINUTES 
BEFORE IT MOVED OVER THE BURN AREA HAS MOVED TO THE EAST. NO 
FLOODING WAS REPORTED IN THE BURN AREA.

LAT...LON 4698 11399 4697 11381 4681 11379 4680 11398

$$
870 
WGUS75 KMSO 272307
FFSMSO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
507 PM MDT FRI JUL 27 2012

MTC063-272314-
/O.CAN.KMSO.FF.W.0006.000000T0000Z-120728T0000Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
MISSOULA MT-
507 PM MDT FRI JUL 27 2012

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

LAT...LON 4698 11399 4697 11381 4681 11379 4680 11398

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 27, 3:12 PM MDTSpecial Weather StatementMSOMissoula48 min
Jul 27, 3:14 PM MDTSevere Thunderstorm WarningMSOMissoula46 min
Jul 27, 3:47 PM MDTSevere Thunderstorm WarningMSOMissoula41 min
Jul 27, 3:53 PM MDTSevere Thunderstorm WarningMSODeer Lodge, Powell, Silver Bow67 min

Nearby

Flash Flood Warnings in Montana, 2012Every flash flood warning in 2012

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.