Alert archive / Idaho / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 24, NWS Pocatello, ID

July 21, 2014Cassia County, Power County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Jul 21, 2014, 8:25 PM MDT for Cassia County, Power County, Idaho. It was in force for 35 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: Jul 21, 2014, 8:25 PM MDT (02:25 UTC)
Expired: Jul 21, 2014, 9:00 PM MDT
In force: 35 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon

Counties Cassia County, ID, Power County, ID

The radar

The Pocatello radar (KSFX), 81 km from the middle of the area, began a volume at 02:27 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

Elko, NV (KLKN), launched 00:00Z, 2.4 hours before the alert went out and 198 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: 40 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 2830 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: -16 m²/s²
0-3 km storm-relative helicity: 139 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 Jul 21, 2:56 PM MDT, 5 hours 29 minutes earlier.

Area forecast discussion, Jul 21, 2:56 PM MDT, 5 hours 29 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
ISSUED BY NATIONAL WEATHER SERVICE BOISE ID
256 PM MDT MON JUL 21 2014

.DISCUSSION...BAND OF MONSOON MOISTURE CAUGHT UP IN SOUTHWEST FLOW OVER
THE AREA IS SUPPORTING SHOWERS AND THUNDERSTORMS ACROSS THE FORECAST
AREA THIS AFTERNOON. DEEP MOISTURE AND MODERATE SHEAR VALUES ARE
SUPPORTING SOME STRONG CELLS CAPABLE OF SIGNIFICANT HAIL AND WIND
GUSTS TO 50 MPH. BUT OVERALL...THINK THAT HEAVY RAIN IS THE MAIN
THREAT. THESE STORMS SHOULD CONTINUE INTO THE EVENING...BUT WEAKEN
AND DIE OUT AFTER SUNSET. FLOW BECOMES A BIT MORE SOUTHERLY BY
TUESDAY...PUSHING BAND OF MOISTURE FURTHER NORTH...SO THAT SHOWERS
AND THUNDERSTORMS SHOULD BE CONFINED MAINLY TO THE CENTRAL IDAHO
MOUNTAINS.

PACIFIC LOW WILL PUSH INLAND WEDNESDAY INTO THURSDAY. THIS BRINGS
DRIER AND COOLER AIR INTO THE AREA ON THURSDAY...WITH THE POTENTIAL
FOR SIGNIFICANT WINDS. BEYOND THAT...DRY AND SEASONAL TEMPERATURES
PREVAIL THROUGH THE WEEKEND. THE RIDGE BEGINS TO BUILD BACK
NORTHWARD BY EARLY IN THE WEEK...WITH WARMING TEMPERATURES AND
EVENTUALLY WITH THE POTENTIAL FOR SOME MONSOON MOISTURE TO RETURN.
&&

.AVIATION...GENERALLY VFR. WIDESPREAD THUNDERSTORMS WITH HEAVY
RAIN...AND POTENTIAL FOR GUSTS TO 50 MPH THROUGH ABOUT 03Z. ON
TUESDAY...MOISTURE SHIFTS SLIGHTLY NORTHWARD WITH THE THUNDERSTORM
THREAT MOSTLY CONFINED TO AREAS AROUND KSUN AND NORTHWARD.

&&

.FIRE WEATHER...CONTINUING RED FLAG WARNING FOR ZONES 422 425 427
AND 410 THROUGH 03Z THIS EVENING WITH SCATTERED THUNDERSTORMS. SOME
OF THESE PRODUCING HEAVY RAIN...BUT ABUNDANT LIGHTNING AND WIND
GUSTS TO 50 MPH COULD DEFINITELY CAUSE NEW FIRE STARTS AND ERRATIC
FIRE BEHAVIOR. THUNDERSTORM THREAT MOVES SLIGHTLY NORTH ON
TUESDAY...AND SHOULD FAVOR UPSLOPE AREAS ON THE NORTH SIDE OF THE
SNAKE RIVER PLAIN. DRIER CONDITIONS EXPECTED WEDNESDAY AND BEYOND.

&&

.PIH WATCHES/WARNINGS/ADVISORIES...

RED FLAG WARNING UNTIL 9 PM MDT MONDAY FOR IDAHO FIRE ZONES 410 422
425 AND 427.

&&

In the hours before

Local storm report, Jul 21, 7:07 PM MDT, 1 hour 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
707 PM MDT MON JUL 21 2014

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

0541 PM     HAIL             12 ENE IDAHOME          42.47N 113.15W
07/21/2014  E0.25 INCH       CASSIA             ID   TRAINED SPOTTER

            PEA SIZE HAIL

&&

DPHELPS

Local storm report, Jul 21, 7:12 PM MDT, 1 hour 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
712 PM MDT MON JUL 21 2014

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

0705 PM     HAIL             1 ENE POCATELLO         42.89N 112.45W
07/21/2014  M0.25 INCH       BANNOCK            ID   PUBLIC

            REPORTED VIA FACEBOOK.

&&

NWS POCATELLO ID
IRIS SYSTEM

Special weather statement, Jul 21, 7:14 PM MDT, 1 hour 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO
ISSUED BY NATIONAL WEATHER SERVICE BOISE ID
714 PM MDT MON JUL 21 2014

IDZ019-220200-
UPPER SNAKE HIGHLANDS ID-
714 PM MDT MON JUL 21 2014

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN FREMONT COUNTY UNTIL
800 PM MDT...

AT 713 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
CHESTER...OR 9 MILES WEST OF ASHTON...MOVING NORTHEAST AT 20 MPH.

DIME SIZE HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

THIS STRONG THUNDERSTORM WILL BE NEAR...
  NORTHERN SAINT ANTHONY SAND DUNES AROUND 720 PM MDT.
  ASHTON AND MARYSVILLE AROUND 750 PM MDT.
  WARM RIVER AROUND 800 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN SAFE TO DO SO...PLEASE RELAY STORM REPORTS TO THE NATIONAL
WEATHER SERVICE IN POCATELLO IDAHO VIA LOCAL LAW ENFORCEMENT...OR
NWS POCATELLO FACEBOOK AND TWITTER ACCOUNTS.

&&

LAT...LON 4395 11163 4408 11180 4434 11152 4414 11126
TIME...MOT...LOC 0113Z 226DEG 12KT 4408 11165

BW

Local storm report, Jul 21, 7:45 PM MDT, 40 minutes before

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Local storm report, Jul 21, 7:48 PM MDT, 37 minutes before

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Local storm report, Jul 21, 7:50 PM MDT, 35 minutes before

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<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Service Notice</title>
  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
      </p>
      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 6:39 PM MDT	Severe Thunderstorm Warning	PIH	Cassia, Oneida, Power	51 min
Jul 21, 6:55 PM MDT	Severe Thunderstorm Warning	PIH	Power	50 min
Jul 21, 7:14 PM MDT	Special Weather Statement	PIH	Fremont	46 min
Jul 21, 7:16 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Power	44 min
Jul 21, 7:37 PM MDT	Areal Flood Advisory	PIH	Bannock, Power	113 min
Jul 21, 7:44 PM MDT	Severe Thunderstorm Warning	PIH	Cassia	46 min
Jul 21, 8:01 PM MDT	Areal Flood Advisory	PIH	Cassia	3 hr
Jul 22, 2:55 AM MDT	Fire Weather Watch	PIH	Bingham, Blaine, Boise, Bonneville, Butte, Cassia and 11 more	34 hr

Nearby

Severe Thunderstorm Warnings in Idaho, 2014 Every severe thunderstorm warning in 2014

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.