Alert archive / Montana / Flash Flood Warnings in 2011

Flash Flood Warning 4, NWS Missoula, MT

July 19, 2011Flathead County, Montana

NWS Missoula, MT issued this flash flood warning at Jul 19, 2011, 4:19 PM MDT for Flathead County, Montana. It was in force for 74 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 19, 2011, 4:19 PM MDT (22:19 UTC)
Expired: Jul 19, 2011, 5:33 PM MDT
In force: 74 min
Issued by: NWS Missoula, MT
Area: Storm-based polygon
Flood severity: None

County Flathead County, MT

The radar

The Missoula radar (KMSX), 187 km from the middle of the area, began a volume at 22:19 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, 10.3 hours before the alert went out and 225 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1818 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: -36 m²/s²
0-3 km storm-relative helicity: 219 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.

924 
WGUS55 KMSO 192219
FFWMSO
MTC029-192345-
/O.NEW.KMSO.FF.W.0004.110719T2219Z-110719T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE MISSOULA MT
419 PM MDT TUE JUL 19 2011

THE NATIONAL WEATHER SERVICE IN MISSOULA HAS ISSUED A

* FLASH FLOOD WARNING FOR GOING TO THE SUN ROAD IN...
  NORTHERN FLATHEAD COUNTY IN NORTHWEST MONTANA...

* UNTIL 545 PM MDT.

* AT 412 PM MDT...DOPPLER RADAR INDICATED FLASH FLOODING OVER THE
  WARNED AREA.

* LOCATIONS IMPACTED INCLUDE...GOING TO THE SUN ROAD AND LOGAN PASS.

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.

FLOODING IS OCCURRING OR IS IMMINENT. IT IS IMPORTANT TO KNOW WHERE
YOU ARE RELATIVE TO STREAMS...RIVERS...OR CREEKS WHICH CAN BECOME
KILLERS IN HEAVY RAINS. CAMPERS AND HIKERS SHOULD AVOID STREAMS OR
CREEKS.

&&

LAT...LON 4877 11375 4874 11370 4870 11370 4868 11373
      4862 11374 4858 11391 4878 11390 4880 11376

$$

1 follow-up statement

376 
WGUS75 KMSO 192333
FFSMSO

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
533 PM MDT TUE JUL 19 2011

MTC029-192343-
/O.CAN.KMSO.FF.W.0004.000000T0000Z-110719T2345Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
FLATHEAD MT-
533 PM MDT TUE JUL 19 2011

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHERN FLATHEAD
COUNTY...

THUNDERSTORMS HAVE MOVED EAST OF GLACIER NATIONAL PARK.   THUS THE 
FLASH FLOOD WARNING HAS BEEN CANCELED.

LAT...LON 4877 11375 4874 11370 4870 11370 4868 11373
      4862 11374 4858 11391 4878 11390 4880 11376

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 19, 3:38 PM MDT	Wind Advisory	MSO	Deer Lodge, Granite, Powell, Silver Bow	5 hr
Jul 19, 3:56 PM MDT	Special Weather Statement	MSO	Flathead, Lake	49 min
Jul 19, 4:54 PM MDT	Special Weather Statement	MSO	Missoula	36 min
Jul 19, 5:14 PM MDT	Severe Thunderstorm Warning	MSO	Missoula	31 min
Jul 19, 5:30 PM MDT	Severe Thunderstorm Warning	MSO	Lake, Missoula, Sanders	30 min
Jul 19, 5:54 PM MDT	Severe Thunderstorm Warning	MSO	Flathead, Missoula, Powell	51 min

Nearby

Flash Flood Warnings in Montana, 2011 Every 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.