Alert archive / Montana / Flash Flood Watches in 2014

Flash Flood Watch 6, NWS Missoula, MT

August 15, 2014Flathead County, Montana

NWS Missoula, MT issued this flash flood watch at Aug 15, 2014, 10:16 AM MDT for Flathead County, Montana. It took effect at Aug 15, 2014, 12:00 PM MDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Aug 15, 2014, 10:16 AM MDT (16:16 UTC)
In effect from: Aug 15, 2014, 12:00 PM MDT
Expired: Aug 15, 2014, 9:00 PM MDT
In force: 9 hr
Issued by: NWS Missoula, MT
Flood severity: None

County Flathead County, MT

The radar

The Missoula radar (KMSX), 140 km from the middle of the area, began a volume at 16:18 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, 4.3 hours before the alert went out and 187 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: 675 J/kg
Mixed-layer CIN: -20 J/kg
Mixed-layer LCL: 685 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Missoula, MT wrote its last area forecast discussion before this flash flood watch went out at Aug 15, 4:20 AM MDT, 5 hours 56 minutes earlier.

Area forecast discussion, Aug 15, 4:20 AM MDT, 5 hours 56 minutes before

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In the hours before

Local storm report, Aug 15, 8:32 AM MDT, 1 hour 44 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE MISSOULA MT
832 AM MDT FRI AUG 15 2014

...TIME...  ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
...DATE...  ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0600 PM     HAIL             5 E GREER               46.39N 116.07W
08/14/2014  E1.25 INCH       CLEARWATER         ID   LAW ENFORCEMENT

            HAIL WAS MOSTLY 1" BUT A FEW WERE UP TO
            HALF-DOLLAR SIZE. IT ACCUMULATED UP TO 12"
            IN PLACES AND DECIMATED A BARLEY CROP. ALSO
            HOLES WERE OBSERVED IN FIBERGLASS BUILDING.
            HAIL DURATION 20 MINUTES.

&&

NWS MISSOULA MT
IRIS SYSTEM

Local storm report, Aug 15, 8:34 AM MDT, 1 hour 42 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE MISSOULA MT
834 AM MDT FRI AUG 15 2014

...TIME...  ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
...DATE...  ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0600 PM     TSTM WND DMG     5 E GREER               46.39N 116.06W
08/14/2014                   CLEARWATER         ID   LAW ENFORCEMENT

            CLEARWATER COUNTY DEPUTY REPORTED A POSSIBLE
            "MICROBURST" AND WINDS IN EXCESS OF 60 MPH.
            A YELLOW PINE TREE SMASHED A SHED. ANOTHER
            YELLOW PINE WAS UPROOTED AND SEVERAL OTHERS
            WERE TWISTED OFF ABOUT 20 TO 30 FEET UP.
            TIME IS IN PDT. TSTM WND DMG DURATION 20
            MINUTES.

&&

NWS MISSOULA MT
IRIS SYSTEM

Special weather statement, Aug 15, 8:58 AM MDT, 1 hour 18 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
858 AM MDT FRI AUG 15 2014

MTZ003-004-151545-
FLATHEAD/MISSION VALLEYS-LOWER CLARK FORK REGION-
858 AM MDT FRI AUG 15 2014

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SANDERS...WESTERN
MISSOULA AND EASTERN MINERAL COUNTIES UNTIL 945 AM MDT...

AT 854 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 7 MILES SOUTHEAST OF TARKIO...OR 20 MILES
SOUTHEAST OF SUPERIOR...MOVING NORTH AT 25 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER IS POSSIBLE WITH THIS STORM...
ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING.

LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...TARKIO...ALBERTON...
CYR...QUARTZ...NINEMILE...HUSON AND STARK.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF THREATENING WEATHER APPROACHES YOUR AREA...GO INDOORS AND STAY
AWAY FROM WINDOWS. IF YOU ARE CAUGHT OUTSIDE...MOVE TO A WELL
PROTECTED AREA.

&&

LAT...LON 4734 11471 4729 11422 4684 11440 4683 11481
TIME...MOT...LOC 1456Z 197DEG 20KT 4698 11461

KINO

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 6:00 PM MDT	Flash Flood Warning	MSO	Mineral	2 hr
Aug 14, 6:10 PM MDT	Flash Flood Warning	MSO	Missoula	3 hr
Aug 14, 6:20 PM MDT	Special Weather Statement	MSO	Missoula	40 min
Aug 14, 6:35 PM MDT	Special Weather Statement	MSO	Missoula	55 min
Aug 14, 6:46 PM MDT	Special Weather Statement	MSO	Sanders	59 min
Aug 14, 8:29 PM MDT	Special Weather Statement	MSO	Sanders	61 min
Aug 14, 9:15 PM MDT	Special Weather Statement	MSO	Sanders	60 min
Aug 15, 8:58 AM MDT	Special Weather Statement	MSO	Mineral	47 min
Aug 15, 11:55 AM MDT	Special Weather Statement	MSO	Powell	35 min
Aug 15, 12:00 PM MDT	Special Weather Statement	MSO	Silver Bow	45 min
Aug 15, 12:05 PM MDT	Severe Thunderstorm Warning	MSO	Deer Lodge, Powell	25 min
Aug 15, 12:08 PM MDT	Severe Thunderstorm Warning	MSO	Deer Lodge, Powell, Silver Bow	22 min
Aug 15, 12:32 PM MDT	Special Weather Statement	MSO	Silver Bow	28 min
Aug 15, 12:43 PM MDT	Areal Flood Advisory	MSO	Silver Bow	2 hr
Aug 15, 1:01 PM MDT	Special Weather Statement	MSO	Lincoln	44 min
Aug 15, 1:05 PM MDT	Areal Flood Advisory	MSO	Deer Lodge, Powell, Silver Bow	115 min
Aug 15, 4:45 PM MDT	Areal Flood Advisory	MSO	Missoula	60 min
Aug 15, 5:36 PM MDT	Special Weather Statement	MSO	Powell	54 min
Aug 15, 5:42 PM MDT	Special Weather Statement	MSO	Lincoln	63 min
Aug 14, 6:14 PM MDT	Severe Thunderstorm Warning	MSO	Clearwater	31 min
Aug 14, 6:44 PM MDT	Special Weather Statement	MSO	Clearwater	31 min
Aug 14, 7:14 PM MDT	Special Weather Statement	MSO	Clearwater	31 min
Aug 15, 10:58 AM MDT	Areal Flood Advisory	MSO	Lemhi	2 hr

Nearby

Flash Flood Watches in Montana, 2014 Every flash flood watch in 2014

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.