Alert archive / Wyoming / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 46, NWS Riverton, WY

July 20, 2009Fremont County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jul 20, 2009, 5:21 PM MDT for Fremont County, Wyoming. It was in force for 39 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 20, 2009, 5:21 PM MDT (23:21 UTC)
Expired: Jul 20, 2009, 6:00 PM MDT
In force: 39 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon

County Fremont County, WY

The radar

The Riverton/Lander radar (KRIW), 13 km from the middle of the area, began a volume at 23:22 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.

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 Riverton, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 20, 2:55 PM MDT, 2 hours 26 minutes earlier.

Area forecast discussion, Jul 20, 2:55 PM MDT, 2 hours 26 minutes before

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Hazardous weather outlook, Jul 20, 2:41 PM MDT, 2 hours 40 minutes before

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In the hours before

Special weather statement, Jul 20, 1:33 PM MDT, 3 hours 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
133 PM MDT MON JUL 20 2009

WYZ009>011-202015-
BIGHORN MOUNTAINS SOUTHEAST-NORTHEAST JOHNSON COUNTY-SOUTHEAST
JOHNSON COUNTY-
133 PM MDT MON JUL 20 2009

...SIGNIFICANT WEATHER ADVISORY FOR JOHNSON COUNTY UNTIL 215 PM
MDT...

AT 131 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR SADDLESTRING...OR 13 MILES NORTHWEST OF
BUFFALO...MOVING SOUTHEAST AT 25 MPH.

PEA SIZE HAIL...BRIEF HEAVY RAIN AND WINDS AROUND 45 MPH ARE
POSSIBLE WITH THIS STORM.

RESIDENTS IN NORTHERN JOHNSON COUNTY...INCLUDING THE LOCATIONS OF
SADDLESTRING AND BUFFALO...SHOULD MONITOR THE WEATHER SITUATION
CLOSELY. BE PREPARED TO TAKE APPROPRIATE ACTION AND MOVE INDOORS AS
THIS STORM APPROACHES.

THIS INCLUDES INTERSTATE 25 IN WYOMING BETWEEN MILE MARKERS 284 AND
299.

THIS INCLUDES INTERSTATE 90 IN WYOMING BETWEEN MILE MARKERS 45 AND
69.

MOTORISTS ON U.S. HIGHWAY 16 WEST OF BUFFALO TO MILE MARKER 80 WILL
ALSO BE IMPACTED BY THIS STORM.

REPORT HAZARDOUS WEATHER TO THE NATIONAL WEATHER SERVICE OFFICE IN
RIVERTON AT 1-800-211-1448.

LAT...LON 4423 10645 4408 10673 4449 10709 4457 10693
      4457 10686
TIME...MOT...LOC 1932Z 323DEG 21KT 4447 10691

JONES

Local storm report, Jul 20, 2:35 PM MDT, 2 hours 46 minutes before

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Special weather statement, Jul 20, 2:38 PM MDT, 2 hours 43 minutes before

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Special weather statement, Jul 20, 5:13 PM MDT, 8 minutes before

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<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 Riverton, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 19, 6:04 PM MDT	Special Weather Statement	RIW		56 min
Jul 19, 6:16 PM MDT	Special Weather Statement	RIW	Natrona	59 min
Jul 19, 7:05 PM MDT	Special Weather Statement	RIW	Hot Springs, Washakie	40 min
Jul 19, 7:51 PM MDT	Special Weather Statement	RIW	Hot Springs	39 min
Jul 20, 1:33 PM MDT	Special Weather Statement	RIW	Johnson	42 min
Jul 20, 1:47 PM MDT	Severe Thunderstorm Warning	RIW	Johnson	49 min
Jul 20, 2:08 PM MDT	Areal Flood Advisory	RIW	Johnson	112 min
Jul 20, 2:38 PM MDT	Special Weather Statement	RIW	Johnson	52 min
Jul 20, 5:13 PM MDT	Special Weather Statement	RIW	Fremont	47 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2009 Every severe thunderstorm 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; radar from the NEXRAD Level II archive.