Alert archive / Idaho / Special Weather Statements in 2012

Special Weather Statement, NWS Pocatello, ID

July 27, 2012Custer County, Idaho

NWS Pocatello, ID issued this special weather statement at Jul 27, 2012, 1:13 PM MDT for Custer County, Idaho. It was in force for 62 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
Jul 27, 2012, 1:13 PM MDT (19:13 UTC)
Expired
Jul 27, 2012, 2:15 PM MDT
In force
62 min
Issued by
NWS Pocatello, ID

County Custer County, ID

The radar

The Boise radar (KCBX), 176 km from the middle of the area, began a volume at 19:16 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, 7.2 hours before the alert went out and 169 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, Boise Airport, ID at 12:00Z on 2012-07-27Temperature 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, Boise Airport, ID at 12:00Z on 2012-07-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 14 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
3079 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
14 m²/s²
0-3 km storm-relative helicity
39 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 Jul 27, 2:04 AM MDT, 11 hours 9 minutes earlier.

Area forecast discussion, Jul 27, 2:04 AM MDT, 11 hours 9 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
204 AM MDT FRI JUL 27 2012

.DISCUSSION...CONVECTION THIS MORNING CONTINUES AS A RESULT OF
FORCING FROM AN UPPER SHORTWAVE TROUGH TAPPING INTO THE ELEVATED
INSTABILITY. IR/WV SATELLITE IMAGERY THIS MORNING SHOWING EXPANDING
CIRRUS SHIELD ACROSS EASTERN IDAHO ASSOCIATED WITH THE CONVECTION.
THETA-E ADVECTION CONTINUES THROUGH THE MORNING HOURS...THEN
THUNDERSTORM DEVELOPMENT WILL BE DRIVEN MORE BY SFC HEATING AND
OROGRAPHIC LIFT IN THE AFTERNOON/EARLY EVENING. DYNAMICS WEAKEN
LATER TONIGHT AS WE MAINTAIN A SOUTHWESTERLY FLOW ALOFT ACROSS
EASTERN IDAHO THROUGH THE WEEKEND AND MUCH OF NEXT WEEK. GFS/ECMWF
BRING AN UPPER TROUGH ACROSS THE PACIFIC NORTHWEST NEXT THURSDAY
NIGHT/FRIDAY...BUT MODELS ARE NOT PRODUCING ANY QPF THOUGH WINDS
COULD INCREASE THURSDAY AND FRIDAY AFTERNOON. HINSBERGER
&&

.AVIATION...A SHORTWAVE TROUGH MOVING THROUGH THE REGION WILL
PRODUCE SCATTERED SHOWERS AND THUNDERSTORMS. WILL INCLUDE VC AT MOST
TAF SITES. EXPECT CONVECTION TO MOVE AWAY FROM THE MAGIC VALLEY BY
THIS AFTERNOON BUT LINGER OVER THE MOUNTAINS/HIGHLANDS AND UPPER
SNAKE PLAIN INTO THE AFTERNOON.  VALLE
&&

.FIRE WEATHER...UPGRADED TO RED FLAG WARNINGS IN 410/476/411/413 AND
CANCELLED WATCH FOR 477/412. SHOWERS AND THUNDERSTORMS ARE MOVING
ACROSS THE AREA THIS MORNING ASSOCIATED WITH AN UPPER LEVEL
SHORTWAVE. THUNDERSTORM COVERAGE IN 477/412 TODAY DOES NOT LOOK
IMPRESSIVE ENOUGH TO JUSTIFY A WARNING HERE. IN THE OTHER
ZONES...NAM/GFS CERTAINLY POINTS TO WIDELY SCATTERED THUNDERSTORMS.
ALSO...WINDS ARE LOOKING STRONGER THIS AFTERNOON BEHIND THE TROUGH
ESPECIALLY IN ZONE 413. THEREFORE ZONE 413 WILL HAVE A RED FLAG FOR
THUNDERSTORMS...LOW HUMIDITY AND WINDS. NO OTHER FIRE WX ISSUES
ANTICIPATED OVER THE WEEKEND AS ANY THUNDERSTORMS SHOULD BE ISOLATED
AT BEST AND WINDS SHOULD BE MUCH LIGHTER. VALLE
&&

.PIH WATCHES/WARNINGS/ADVISORIES...
RED FLAG WARNING UNTIL 10 PM MDT THIS EVENING IDZ410.

RED FLAG WARNING UNTIL 10 PM MDT THIS EVENING IDZ413.

RED FLAG WARNING UNTIL 10 PM MDT THIS EVENING BELOW 6000 FEET
FOR THE IDZ476.

&&
Hazardous weather outlook, Jul 27, 4:13 AM MDT, 9 hours before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE POCATELLO ID
413 AM MDT FRI JUL 27 2012

IDZ017>025-031-032-281015-
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-
413 AM MDT FRI JUL 27 2012

THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN IDAHO.

.DAY ONE...TODAY AND TONIGHT

A RED FLAG WARNING IS IN EFFECT THROUGH THIS EVENING. SEE OUR
WEBSITE FOR MORE DETAILS. SCATTERED THUNDERSTORMS ARE POSSIBLE
TODAY AND TONIGHT ACROSS PARTS OF THE EASTERN HIGHLANDS AND ACROSS
THE CENTRAL MOUNTAINS.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.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 27, 12:41 PM MDT, 32 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
1241 PM MDT FRI JUL 27 2012

IDZ018-032-271915-
CUSTER ID-
1241 PM MDT FRI JUL 27 2012

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  CENTRAL CUSTER COUNTY IN CENTRAL IDAHO

UNTIL 115 PM MDT

AT 1239 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 12 MILES NORTHWEST OF DICKEY..MOVING NORTHEAST AT
15 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS IN EXCESS OF 40
MPH ARE EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS
LIGHTNING.

LOCATIONS IMPACTED INCLUDE...
  RURAL CENTRAL CUSTER COUNTY...

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

IN ADDITION...THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR
LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR
ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL
WEATHER SERVICE.

LAT...LON 4447 11398 4431 11377 4411 11410 4424 11428
TIME...MOT...LOC 1841Z 226DEG 13KT 4424 11409

JKEYES
Special weather statement, Jul 27, 12:55 PM MDT, 18 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
1255 PM MDT FRI JUL 27 2012

IDZ032-271930-
CUSTER ID-
1255 PM MDT FRI JUL 27 2012

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  NORTH CENTRAL CUSTER COUNTY IN CENTRAL IDAHO

UNTIL 130 PM MDT

AT 1251 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 14 MILES NORTH OF CHALLIS..MOVING EAST AT 10 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM ALONG WITH FREQUENT DANGEROUS LIGHTNING.

LOCATIONS IMPACTED INCLUDE...
  RURAL NORTHERN CUSTER COUNTY...

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

IN ADDITION...THIS STORM MAY INTENSIFY...SO BE CERTAIN TO MONITOR
LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV OUTLETS...FOR
ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE NATIONAL
WEATHER SERVICE.

LAT...LON 4476 11439 4476 11436 4479 11435 4485 11419
      4481 11418 4476 11421 4474 11414 4476 11408
      4466 11403 4459 11436 4465 11440 4470 11439
      4474 11441
TIME...MOT...LOC 1854Z 248DEG 8KT 4470 11429

JKEYES
Special weather statement, Jul 27, 1:13 PM MDT, 0 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
113 PM MDT FRI JUL 27 2012

IDZ018-031-032-272015-
BUTTE ID-BLAINE ID-CUSTER ID-
113 PM MDT FRI JUL 27 2012

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

SIGNIFICANT WEATHER ADVISORY FOR...
  CUSTER COUNTY IN CENTRAL IDAHO
  NORTHWESTERN BLAINE COUNTY IN CENTRAL IDAHO
  NORTH CENTRAL BUTTE COUNTY IN EAST CENTRAL IDAHO

UNTIL 215 PM MDT

AT 108 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
MULTIPLE STRONG THUNDERSTORMS ACROSS THE ADVISORY AREA...MOVING
NORTHEAST AT 15 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS TO AROUND 40 MPH
ARE EXPECTED...ALONG WITH FREQUENT DANGEROUS LIGHTNING.

LOCATIONS IMPACTED INCLUDE...
  STANLEY...
  CHALLIS...
  MACKAY...
  CLAYTON...
  CHILLY BARTON FLATS...
  GALENA SUMMIT...

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

IN ADDITION...THESE STORMS MAY INTENSIFY...SO BE CERTAIN TO MONITOR
LOCAL RADIO AND TV STATIONS...AS WELL AS LOCAL CABLE TV
OUTLETS...FOR ADDITIONAL INFORMATION AND POSSIBLE WARNINGS FROM THE
NATIONAL WEATHER SERVICE.

LAT...LON 4478 11510 4473 11495 4481 11481 4466 11473
      4458 11456 4488 11421 4476 11421 4476 11408
      4449 11380 4446 11345 4424 11332 4424 11301
      4420 11299 4354 11459 4360 11469 4380 11471
      4385 11498 4415 11503 4420 11517 4458 11531
TIME...MOT...LOC 1910Z 224DEG 14KT 4439 11399

JKEYES

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 27, 3:56 AM MDTRed Flag WarningPIHBannock, Bear Lake, Bonneville, Butte, Caribou, Clark and 8 more16 hr
Jul 27, 12:41 PM MDTSpecial Weather StatementPIHCuster34 min
Jul 27, 12:55 PM MDTSpecial Weather StatementPIHLemhi35 min
Jul 27, 2:15 PM MDTSpecial Weather StatementPIHCuster60 min
Jul 27, 3:05 PM MDTSpecial Weather StatementPIHClark55 min
Jul 27, 3:42 PM MDTSpecial Weather StatementPIHButte, Jefferson63 min
Jul 27, 4:40 PM MDTSpecial Weather StatementPIHTeton50 min

Nearby

Special Weather Statements in Idaho, 2012Every special weather statement in 2012

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.