Alert archive / Idaho / Areal Flood Warnings in 2011

Areal Flood Warning 52, NWS Missoula, MT

June 29, 2011Lemhi County, Idaho

NWS Missoula, MT issued this areal flood warning at Jun 29, 2011, 8:40 AM MDT for Lemhi County, Idaho. It was in force for 21 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jun 29, 2011, 8:40 AM MDT (14:40 UTC)
Expired
Jun 30, 2011, 5:20 AM MDT
In force
21 hr
Issued by
NWS Missoula, MT
Area
Storm-based polygon
Flood severity
None

County Lemhi County, ID

The radar

The Pocatello radar (KSFX), 227 km from the middle of the area, began a volume at 14:41 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, 2.7 hours before the alert went out and 360 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 2011-06-29Temperature 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 2011-06-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 square meters per square second.193958Sfc1 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
1044 m above ground
0-6 km bulk shear
19 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
119 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 areal flood warning 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 areal flood warning went out at Jun 29, 3:24 AM MDT, 5 hours 16 minutes earlier.

Area forecast discussion, Jun 29, 3:24 AM MDT, 5 hours 16 minutes before
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Hazardous weather outlook, Jun 29, 3:41 AM MDT, 4 hours 59 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE MISSOULA MT
341 AM MDT WED JUN 29 2011

IDZ006-MTZ005>007-043-292145-
SOUTHERN CLEARWATER MOUNTAINS-MISSOULA/BITTERROOT VALLEYS-
BITTERROOT/SAPPHIRE MOUNTAINS-BUTTE/BLACKFOOT REGION-
POTOMAC/SEELEY LAKE REGION-
341 AM MDT WED JUN 29 2011 /241 AM PDT WED JUN 29 2011/

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
IDAHO AND WEST CENTRAL MONTANA.

.DAY ONE...TODAY AND TONIGHT

SHOWERS AND THUNDERSTORMS WILL DEVELOP BY EARLY AFTERNOON WITH THE
POTENTIAL FOR LARGE HAIL AND DAMAGING WINDS. PERSONS WITH OUTDOOR
ACTIVITIES SHOULD KEEP AN EYE TO THE SKY AND STAY ALERT TO LATER
FORECASTS FOR POTENTIAL SEVERE WEATHER HEADLINES THROUGHOUT THE
DAY.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

CONTINUED RISES IN SMALL STREAMS ARE EXPECTED AS THE TEMPERATURES
REBOUND THIS WEEKEND INTO NEXT WEEK. THIS WILL LEAD TO RISING
RIVER FLOWS (BOTH SMALL STREAM AND MAIN STEM RIVERS) THROUGH THE
WEEK INTO THIS WEEKEND ACROSS ALL OF WESTERN MONTANA AND CENTRAL
IDAHO. SOME OF THESE RIVERS AND STREAMS MAY BECOME A CONCERN BY
LATER IN THE WEEKEND.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

IDZ009-292145-
WESTERN LEMHI COUNTY-
341 AM MDT WED JUN 29 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
IDAHO.

FOR THE LATEST INFORMATION ON WATCHES...WARNINGS AND ADVISORIES...GO
TO WEATHER.GOV/MISSOULA.

.DAY ONE...TODAY AND TONIGHT

UNSTABLE CONDITIONS WILL ALLOW STRONG WINDS ALOFT TO MIX TO THE
SURFACE ACROSS PORTIONS OF EASTERN LEMHI COUNTY. A WIND ADVISORY
HAS BEEN ISSUED TO ACCOUNT FOR THESE WINDS.
IN ADDITION...SCATTERED THUNDERSTORMS WILL DEVELOP THIS AFTERNOON
AND EVENING AND MAY PRODUCE HAIL IN COMBINATION WITH THE WINDS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

CONTINUED RISES IN SMALL STREAMS ARE EXPECTED AS THE TEMPERATURES
REBOUND THIS WEEKEND INTO NEXT WEEK. THIS WILL LEAD TO RISING
RIVER FLOWS (BOTH SMALL STREAM AND MAIN STEM RIVERS) THROUGH THE
WEEK INTO THIS WEEKEND ACROSS LEMHI COUNTY IDAHO. SOME OF THESE
RIVERS AND STREAMS MAY BECOME A CONCERN BY LATER IN THE WEEKEND.

.SPOTTER INFORMATION STATEMENT...

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 29, 12:04 PM MDTLake Wind AdvisoryMSOFlathead, Lake, Sanders6 hr
Jun 29, 1:49 PM MDTSpecial Weather StatementMSOSilver Bow26 min
Jun 29, 2:45 PM MDTSpecial Weather StatementMSOGranite45 min
Jun 29, 2:48 PM MDTSpecial Weather StatementMSOMissoula42 min
Jun 29, 3:21 AM MDTWind AdvisoryMSOLemhi18 hr

Nearby

Areal Flood Warnings in Idaho, 2011Every areal 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.