Alert archive / Idaho / Special Weather Statements in 2021

Special Weather Statement, NWS Boise, ID

August 1, 2021Jerome County, Idaho

NWS Boise, ID issued this special weather statement at Aug 1, 2021, 2:15 PM MDT for Jerome County, Idaho. It was in force for 60 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: Aug 1, 2021, 2:15 PM MDT (20:15 UTC)
Expired: Aug 1, 2021, 3:15 PM MDT
In force: 60 min
Issued by: NWS Boise, ID

County Jerome County, ID

The radar

The Pocatello radar (KSFX), 136 km from the middle of the area, began a volume at 20:14 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 12:00Z, 8.3 hours before the alert went out and 192 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: 131 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 817 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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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 Boise, ID wrote its last area forecast discussion before this special weather statement went out at Aug 1, 10:03 AM MDT, 4 hours 12 minutes earlier.

Area forecast discussion, Aug 1, 10:03 AM MDT, 4 hours 12 minutes before

<!doctype html>
<html lang="en">
<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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In the hours before

Special weather statement, Aug 1, 1:11 PM MDT, 1 hour 4 minutes before

Special Weather Statement
National Weather Service Boise ID
111 PM MDT Sun Aug 1 2021

IDZ016-030-012000-
Southern Twin  Falls County ID-Western Magic Valley ID-
111 PM MDT Sun Aug 1 2021

...SIGNIFICANT WEATHER ADVISORY FOR WEST CENTRAL JEROME...WEST
CENTRAL TWIN FALLS AND SOUTHEASTERN GOODING COUNTIES UNTIL 200 PM
MDT...

At 108 PM MDT, Doppler radar was tracking a strong thunderstorm near
Hollister, or 18 miles southwest of Twin Falls, moving north at 15
mph.

Half inch hail and wind gusts up to 50 mph will be possible with this
storm.

This strong thunderstorm will be near...
  Hollister around 110 PM MDT.
  Magic Valley Regional Airport around 150 PM MDT.
  Twin Falls, Jerome, Filer and Buhl around 200 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4226 11463 4232 11486 4274 11477 4266 11437
TIME...MOT...LOC 1908Z 199DEG 15KT 4238 11471

JB

Special weather statement, Aug 1, 2:15 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Boise ID
215 PM MDT Sun Aug 1 2021

IDZ016-030-012115-
Southern Twin  Falls County ID-Western Magic Valley ID-
215 PM MDT Sun Aug 1 2021

...SIGNIFICANT WEATHER ADVISORY FOR JEROME AND CENTRAL TWIN FALLS
COUNTIES UNTIL 315 PM MDT...

At 214 PM MDT, Doppler radar was tracking a cluster of strong
thunderstorms over Magic Valley Regional Airport, or near Twin
Falls, moving northeast at 20 mph.

Pea size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Twin Falls, Jerome, Kimberly, Filer, Hansen, Hazelton, Eden,
Murtaugh, Rock Creek, Magic Valley Regional Airport, Minidoka
National Monument and Milner Dam.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4251 11406 4243 11407 4241 11410 4242 11429
      4229 11429 4246 11471 4285 11459 4283 11437
      4281 11435 4281 11405 4276 11405 4276 11393
      4254 11393
TIME...MOT...LOC 2014Z 206DEG 31KT 4251 11449

JB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 31, 6:40 PM MDT	Special Weather Statement	BOI	Twin Falls	35 min
Jul 31, 7:06 PM MDT	Flash Flood Warning	BOI	Owyhee, Twin Falls	3 hr
Jul 31, 7:39 PM MDT	Flash Flood Warning	BOI	Twin Falls	3 hr
Jul 31, 9:32 PM MDT	Special Weather Statement	BOI	Ada	28 min
Jul 31, 9:33 PM MDT	Areal Flood Advisory	BOI	Elmore, Owyhee	117 min
Jul 31, 10:12 PM MDT	Flash Flood Warning	BOI	Ada, Boise	3 hr
Jul 31, 11:58 PM MDT	Flash Flood Warning	BOI	Canyon, Gem, Owyhee, Payette	2 hr
Aug 1, 12:43 AM MDT	Areal Flood Advisory	BOI	Payette, Washington	2 hr
Aug 1, 1:47 AM MDT	Areal Flood Advisory	BOI	Camas	103 min
Aug 1, 1:11 PM MDT	Special Weather Statement	BOI	Twin Falls	49 min
Aug 1, 1:25 PM MDT	Areal Flood Advisory	BOI	Twin Falls	3 hr
Aug 1, 2:39 PM MDT	Flash Flood Warning	BOI	Elmore	5 hr
Aug 1, 3:21 PM MDT	Areal Flood Advisory	BOI	Jerome, Twin Falls	3 hr
Aug 1, 3:39 PM MDT	Flash Flood Warning	BOI	Camas, Elmore	3 hr
Aug 1, 4:01 PM MDT	Flash Flood Warning	BOI	Owyhee	3 hr
Aug 1, 4:49 PM MDT	Areal Flood Advisory	BOI	Elmore	3 hr
Aug 1, 5:32 PM MDT	Flash Flood Warning	BOI	Elmore	3 hr
Aug 1, 5:39 PM MDT	Areal Flood Advisory	BOI	Owyhee	2 hr

Nearby

Special Weather Statements in Idaho, 2021 Every special weather statement in 2021

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.