Alert archive / Idaho / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 37, NWS Pocatello, ID

June 26, 2009Bannock County, Bear Lake County, Caribou County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Jun 26, 2009, 4:46 PM MDT for Bannock County, Bear Lake County, Caribou County, Idaho. It was in force for 24 min. 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 26, 2009, 4:46 PM MDT (22:46 UTC)
Expired: Jun 26, 2009, 5:10 PM MDT
In force: 24 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon

Counties Bannock County, ID, Bear Lake County, ID, Caribou County, ID

The radar

The Pocatello radar (KSFX), 99 km from the middle of the area, began a volume at 22:48 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

Salt Lake City I, UT (KSLC), launched 12:00Z, 10.8 hours before the alert went out and 200 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: 58 J/kg
Mixed-layer CIN: -144 J/kg
Mixed-layer LCL: 1146 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: -34 m²/s²
0-3 km storm-relative helicity: -117 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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Pocatello, ID wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 26, 2:54 PM MDT, 1 hour 52 minutes earlier.

Area forecast discussion, Jun 26, 2:54 PM MDT, 1 hour 52 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
254 PM MDT FRI JUN 26 2009

.SHORT TERM...THE UPPER LEVEL TROUGH AXIS WILL BE CROSSING THE
EASTERN HIGHLANDS ABOUT 630 PM THIS EVENING AND THUNDERSTORM
ACITVITY WILL TAPPER OFF QUICKLY THIS EVENING AS IT CROSS THE
STATE LINE BEFORE MIDNIGHT. THE NEVADA LOW FROM THIS MORNING
TRAVELED ACROSS THE SOUTHEAST CORNER OF THE STATE. THUNDERSTORMS
BEGAN TRAINING IN THE POCATELLO AREA RESULTING IN FLASH FLOODING.

ONCE THIS TROUGH AXIS MOVES EAST...A PREDOMINATELY WESTERLY FLOW
OR ZONAL PATTERN DEVELOPS WITH LARGELY DRY CONDITONS THE NEXT
SEVERAL DAYS. RS

.AVIATION...SHOWERS AND THUNDERSTORMS OVE THE EASTERN HIGHLANDS
AND UPPER SNAKE PLAIN ENDING BY 06Z. THEN...WIDESPREAD VFR. RS

&&

.PIH WATCHES/WARNINGS/ADVISORIES...
FLOOD WARNING FOR THE SNAKE RIVER AT BLACKFOOT CONTINUES.

&&

Hazardous weather outlook, Jun 26, 4:41 AM MDT, 12 hours 5 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE POCATELLO ID
441 AM MDT FRI JUN 26 2009

IDZ017>025-031-032-271045-
EASTERN MAGIC VALLEY-SAWTOOTH MOUNTAINS-UPPER SNAKE HIGHLANDS-
UPPER SNAKE RIVER PLAIN-LOWER SNAKE RIVER PLAIN-
SOUTH CENTRAL HIGHLANDS-CARIBOU HIGHLANDS-
CACHE VALLEY/IDAHO PORTION-WASATCH MOUNTAINS/IDAHO PORTION-
BIG AND LITTLE WOOD RIVER REGION-LOST RIVER/PAHSIMEROI-
441 AM MDT FRI JUN 26 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN IDAHO.

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS ARE EPXECTED TO CONTINUE
ACROSS THE AREA THROUGH THIS EVENING. LOCALLY HEAVY
RAINFALL...PEAS SIZED HAIL AND WIND GUSTS TO 50 MPH ARE POSSIBLE
WITH THUNDERSTORMS.

AREA WATERWAYS CONTINUE TO RUN HIGH DUE TO RECENT HEAVY RAINFALL.
ADDITIONAL RAINFALL TTODAY COULD AGGRAVATE THE SITUATION. THE
SNAKE RIVER NEAR BLACKFOOT IS EXPECTED TO CONTINUE TO FLOW NEAR
MODERATE FLOOD STAGE TODAY. CONTINUE TO MONITOR THE LATEST RIVER
FORECASTS FOR UPDATES ON THIS SITUATION.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

HIGH PRESSURE IS EXPECTED TO BRING DRIER WEATHER TO THE REGION
SATURDAY THROUGH MONDAY.

.SPOTTER INFORMATION STATEMENT...

WE ASK TRAINED SPOTTERS AND CITIZENS TO REPORT SIGNIFICANT
WEATHER CONDITIONS WHEN IT IS SAFE TO DO SO. THESE CONDITIONS MAY
INCLUDE HAIL...TORNADOES...STRONG WIND...DUST STORMS...SNOWFALL...
EXTREME COLD TEMPERATURES...FREEZING RAIN OR HEAVY RAIN...DENSE
FOG...AND FLOODING OR ICE JAMS. INFORMATION ABOUT THESE HAZARDOUS
CONDITIONS SHOULD BE CALLED INTO YOUR NATIONAL WEATHER SERVICE
OFFICE IN POCATELLO USING THE 1-800 SEVERE WEATHER HOTLINE...OR
208-233-0834.

In the hours before

Local storm report, Jun 26, 4:19 PM MDT, 27 minutes before

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Special weather statement, Jun 26, 4:19 PM MDT, 27 minutes before

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Local storm report, Jun 26, 4:22 PM MDT, 24 minutes before

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Local storm report, Jun 26, 4:36 PM MDT, 10 minutes before

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Local storm report, Jun 26, 4:40 PM MDT, 6 minutes before

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Local storm report, Jun 26, 4:46 PM MDT, 0 minutes before

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The office that day

Everything else NWS Pocatello, ID issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 25, 6:20 PM MDT	Special Weather Statement	PIH	Bannock	55 min
Jun 26, 12:01 PM MDT	Special Weather Statement	PIH	Bannock	44 min
Jun 26, 12:19 PM MDT	Flash Flood Warning	PIH	Bannock	86 min
Jun 26, 1:32 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Caribou	28 min
Jun 26, 1:49 PM MDT	Special Weather Statement	PIH	Oneida	41 min
Jun 26, 1:50 PM MDT	Flash Flood Warning	PIH	Bannock	55 min
Jun 26, 2:24 PM MDT	Special Weather Statement	PIH	Butte, Clark, Jefferson	51 min
Jun 26, 2:44 PM MDT	Flash Flood Warning	PIH	Bannock	61 min
Jun 26, 3:06 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Bonneville, Jefferson	39 min
Jun 26, 3:16 PM MDT	Special Weather Statement	PIH	Franklin	59 min
Jun 26, 3:45 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Bonneville, Jefferson	45 min
Jun 26, 3:46 PM MDT	Flash Flood Warning	PIH	Bannock	119 min
Jun 26, 4:19 PM MDT	Special Weather Statement	PIH	Bear Lake, Caribou, Franklin	56 min
Jun 26, 4:22 PM MDT	Severe Thunderstorm Warning	PIH	Butte	19 min
Jun 26, 4:28 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Bonneville	47 min
Jun 26, 5:09 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Bonneville	33 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2009 Every severe thunderstorm warning in 2009

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.