Alert archive / Montana / Flash Flood Warnings in 2004

Flash Flood Warning 1, NWS Missoula, MT

May 20, 2004Flathead County, Montana

NWS Missoula, MT issued this flash flood warning at May 20, 2004, 2:25 PM MDT for Flathead 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
May 20, 2004, 2:25 PM MDT (20:25 UTC)
Expired
May 20, 2004, 3:30 PM MDT
In force
65 min
Issued by
NWS Missoula, MT
Area
Counties, with a storm outline in the text

County Flathead County, MT

The radar

The Missoula radar (KMSX), 140 km from the middle of the area, began a volume at 20:28 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, 8.4 hours before the alert went out and 188 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 2004-05-20Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Spokane, WA at 12:00Z on 2004-05-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 26 square meters per square second.1939Sfc1 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
1163 m above ground
0-6 km bulk shear
2 kt
0-1 km storm-relative helicity
26 m²/s²
0-3 km storm-relative helicity
-20 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.

000 
WGUS55 KMSO 202025
FFWMSO
MTC029-202130-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
225 PM MDT THU MAY 20 2004

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL FLATHEAD COUNTY IN NORTHWEST MONTANA
  THIS INCLUDES BETA CREEK AND MAMIE CREEK BURN AREA NEAR HUNGRY
  HORSE RESERVOIR

* UNTIL 330 PM MDT

* AT 218 PM MDT...DOPPLER RADAR INDICATED VERY HEAVY RAIN FROM A
  THUNDERSTORM NEAR BETA CREEK AND MAMIE CREEK BURN AREA NEAR HUNGRY
  HORSE RESERVOIR...OR ABOUT 12 MILES EAST OF EVERGREEN...MOVING
  NORTH AT 5 MPH.

* THE THUNDERSTORM PRODUCING VERY HEAVY RAIN WILL BE...
  OVER BETA CREEK AND MAMIE CREEK BURN AREA NEAR HUNGRY HORSE
  RESERVOIR BY 235 PM MDT

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 4825 11406 4831 11394 4836 11401 4832 11410

$$

Nearby

Flash Flood Warnings in Montana, 2004Every flash flood warning in 2004

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.