Alert archive / Idaho / Special Weather Statements in 2011

Special Weather Statement, NWS Pocatello, ID

April 21, 2011Bannock County, Oneida County, Idaho

NWS Pocatello, ID issued this special weather statement at Apr 21, 2011, 12:39 PM MDT for Bannock County, Oneida County, Idaho. It was in force for 51 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: Apr 21, 2011, 12:39 PM MDT (18:39 UTC)
Expired: Apr 21, 2011, 1:30 PM MDT
In force: 51 min
Issued by: NWS Pocatello, ID

Counties Bannock County, ID, Oneida County, ID

The radar

The Pocatello radar (KSFX), 89 km from the middle of the area, began a volume at 18:39 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, 6.7 hours before the alert went out and 178 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: 411 J/kg
Mixed-layer CIN: -62 J/kg
Mixed-layer LCL: 1122 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 87 m²/s²
0-3 km storm-relative helicity: 138 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Apr 21, 3:32 AM MDT, 9 hours 7 minutes earlier.

Area forecast discussion, Apr 21, 3:32 AM MDT, 9 hours 7 minutes before

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Hazardous weather outlook, Apr 21, 4:32 AM MDT, 8 hours 7 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE POCATELLO ID
432 AM MDT THU APR 21 2011

IDZ017>025-031-032-221045-
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-
432 AM MDT THU APR 21 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN IDAHO.

.DAY ONE...TODAY AND TONIGHT

A STRONG COLD FRONT IS MOVING THROUGH EASTERN IDAHO TODAY. A WIND
ADVISORY HAS BEEN ISSUED FOR THE SNAKE RIVER PLAIN FROM 2 PM TO 9
PM. VALLEY RAIN AND MOUNTAIN SNOW SHOWERS WILL FALL TODAY WITH
SNOW LEVELS BETWEEN 5 AND 6 THOUSAND FEET. 2 TO 4 INCHES MAY FALL
ABOVE 6 THOUSAND FEET.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

THERE WILL LIKELY BE SOME RAIN AND SNOW IN THE SUNDAY THROUGH
MONDAY TIME PERIOD. OTHERWISE IT SHOULD BE DRY.

.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, Apr 21, 11:37 AM MDT, 1 hour 2 minutes before

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Local storm report, Apr 21, 12:15 PM MDT, 24 minutes before

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Local storm report, Apr 21, 12:23 PM MDT, 16 minutes before

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Local storm report, Apr 21, 12:26 PM MDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO
1226 PM MDT THU APR 21 2011

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

1115 AM     HAIL             IDAHO FALLS             43.49N 112.04W
04/21/2011  M0.25 INCH       BONNEVILLE         ID   BROADCAST MEDIA

            BROADCAST METEOROLOGIST AT KIFI REPORTS PEA SIZE HAIL

&&

CHATTINGS

Local storm report, Apr 21, 12:33 PM MDT, 6 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO
1233 PM MDT THU APR 21 2011

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

1232 PM     HAIL             1 N POCATELLO           42.89N 112.47W
04/21/2011  M0.25 INCH       BANNOCK            ID   TRAINED SPOTTER

            OUTSIDE THE COSTCO IN POCATELLO

&&

CHATTINGS

Special weather statement, Apr 21, 12:39 PM MDT, 0 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO
1239 PM MDT THU APR 21 2011

IDZ021>024-211930-
CARIBOU ID-ONEIDA ID-POWER ID-BANNOCK ID-FRANKLIN ID-
1239 PM MDT THU APR 21 2011

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  SOUTHWESTERN FRANKLIN COUNTY IN SOUTHEAST IDAHO
  BANNOCK COUNTY IN SOUTHEAST IDAHO
  SOUTHEASTERN POWER COUNTY IN SOUTHEAST IDAHO
  ONEIDA COUNTY IN SOUTHEAST IDAHO
  SOUTHWESTERN CARIBOU COUNTY IN SOUTHEAST IDAHO

UNTIL 130 PM MDT

AT 1235 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 8 MILES SOUTHEAST OF
NEELEY TO 10 MILES WEST OF BUIST TO 7 MILES NORTHWEST OF
SNOWVILLE..AND MOVING EAST AT 40 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
   BUIST AND  CRYSTAL...
   RIDGEDALE...
   HAWKINS AND  PLEASANTVIEW...
   PORTNEUF...
   INKOM... ARIMO... DOWNEY... MALAD CITY... MCCAMMON AND
   VIRGINIA...
   CHERRY CREEK...
   SWANLAKE...

LAT...LON 4199 11284 4237 11269 4276 11284 4288 11207
      4243 11185 4241 11190 4231 11190 4201 11204
TIME...MOT...LOC 1838Z 267DEG 38KT 4268 11270 4237 11257
          4205 11274

HEDGES

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 21, 2:30 AM MDT	Wind Advisory	PIH		19 hr
Apr 21, 9:50 AM MDT	Special Weather Statement	PIH	Butte	40 min
Apr 21, 11:10 AM MDT	Special Weather Statement	PIH	Jefferson	50 min
Apr 21, 11:32 AM MDT	Special Weather Statement	PIH	Minidoka	43 min
Apr 21, 11:34 AM MDT	Special Weather Statement	PIH	Fremont	41 min
Apr 21, 1:13 PM MDT	Special Weather Statement	PIH	Jefferson, Madison	47 min
Apr 21, 1:39 PM MDT	Severe Thunderstorm Warning	PIH	Franklin, Oneida	35 min
Apr 21, 4:42 PM MDT	Special Weather Statement	PIH	Clark	33 min

Nearby

Special Weather Statements in Idaho, 2011 Every special weather statement 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.