Alert archive / Idaho / Flash Flood Warnings in 2009

Flash Flood Warning 30, NWS Pocatello, ID

July 3, 2009Blaine County, Idaho

NWS Pocatello, ID issued this flash flood warning at Jul 3, 2009, 2:08 PM MDT for Blaine County, Idaho. It was in force for 3 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: Jul 3, 2009, 2:08 PM MDT (20:08 UTC)
Expired: Jul 3, 2009, 5:00 PM MDT
In force: 3 hr
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Flood severity: None

County Blaine County, ID

The radar

The Pocatello radar (KSFX), 110 km from the middle of the area, began a volume at 20:08 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

Boise Airport, ID (KBOI), launched 12:00Z, 8.1 hours before the alert went out and 180 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: 14 J/kg
Mixed-layer CIN: -362 J/kg
Mixed-layer LCL: 2397 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 59 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 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 flash flood warning went out at Jul 3, 2:19 AM MDT, 11 hours 49 minutes earlier.

Area forecast discussion, Jul 3, 2:19 AM MDT, 11 hours 49 minutes before

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Hazardous weather outlook, Jul 3, 4:17 AM MDT, 9 hours 51 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE POCATELLO ID
417 AM MDT FRI JUL 3 2009

IDZ017>025-031-032-041030-
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-
417 AM MDT FRI JUL 3 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN IDAHO.

.DAY ONE...TODAY AND TONIGHT

MONSOONAL MOISTURE IS EXPECTED TO TRIGGER SCATTERED SHOWERS AND
THUNDERSTORMS TODAY THROUGH THIS EVENING. SOME OF THESE STORMS MAY
BE STRONG AND COULD PRODUCE HEAVY DOWNPOURS...SMALL HAIL AND WIND
GUSTS TO 50 MPH. ACTIVITY IS EXPECTED TO WEAKEN AND BECOME
ISOLATED OVERNIGHT.

THE SNAKE RIVER AT BLACKFOOT REMAINS JUST BELOW FLOOD STAGE. HEAVY
RAINFALL IS POSSIBLE TODAY AND MAY AGGRAVATE ALREADY HIGH WATER LEVELS.
CONTINUE TO MONITOR THE LATEST FORECASTS FOR UPDATES ON THIS SITUATION.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED FOR THE FOURTH OF
JULY. THE BEST CHANCES FOR PRECIPITATION WILL BE IN THE SOUTHERN
AND EASTERN HIGHLANDS. LOCALLY HEAVY RAINFALL WILL ALSO BE
POSSIBLE IN THESE AREAS. ACTIVITY WILL WEAKEN AND BECOME ISOLATED
IN THE EVENING HOURS. DRIER WEATHER IS EXPECTED FOR THE FIRST HALF
OF NEXT WEEK.

.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

Special weather statement, Jul 3, 1:54 PM MDT, 14 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO
154 PM MDT FRI JUL 3 2009

IDZ032-032045-
CUSTER ID-BUTTE ID-
154 PM MDT FRI JUL 3 2009

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTHEASTERN CUSTER COUNTY IN CENTRAL IDAHO
  WEST CENTRAL BUTTE COUNTY IN EAST CENTRAL IDAHO

UNTIL 245 PM MDT

AT 153 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR LOST RIVER..MOVING EAST AT 10 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
  RURAL WESTERN BUTTE COUNTY...
  RURAL SOUTHEASTERN CUSTER COUNTY...

LAT...LON 4378 11328 4356 11337 4356 11340 4369 11372
      4380 11365
TIME...MOT...LOC 1954Z 277DEG 8KT 4370 11353

HEDGES

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 2, 6:03 PM MDT	Severe Thunderstorm Warning	PIH	Lincoln	27 min
Jul 2, 6:42 PM MDT	Special Weather Statement	PIH	Power	48 min
Jul 2, 7:05 PM MDT	Special Weather Statement	PIH	Bingham	55 min
Jul 2, 7:14 PM MDT	Special Weather Statement	PIH	Minidoka	46 min
Jul 2, 8:02 PM MDT	Special Weather Statement	PIH	Bingham, Power	58 min
Jul 2, 9:00 PM MDT	Special Weather Statement	PIH	Bannock, Power	60 min
Jul 2, 9:55 PM MDT	Special Weather Statement	PIH	Bannock, Bonneville, Caribou	65 min
Jul 3, 1:54 PM MDT	Special Weather Statement	PIH	Butte	51 min
Jul 3, 2:37 PM MDT	Special Weather Statement	PIH	Butte	53 min
Jul 3, 2:47 PM MDT	Severe Thunderstorm Warning	PIH	Butte	41 min
Jul 3, 3:40 PM MDT	Special Weather Statement	PIH	Bingham, Jefferson	65 min
Jul 3, 4:07 PM MDT	Severe Thunderstorm Warning	PIH	Bonneville, Jefferson	53 min
Jul 3, 4:48 PM MDT	Special Weather Statement	PIH	Bannock, Bingham, Bonneville	87 min
Jul 3, 5:16 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Bonneville	59 min
Jul 3, 5:45 PM MDT	Severe Thunderstorm Warning	PIH	Bingham, Bonneville, Caribou	26 min
Jul 3, 5:58 PM MDT	Special Weather Statement	PIH	Oneida	62 min

Nearby

Flash Flood Warnings in Idaho, 2009 Every flash flood 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.