Alert archive / Wyoming / Special Weather Statements in 2014

Special Weather Statement, NWS Riverton, WY

May 20, 2014

NWS Riverton, WY issued this special weather statement at May 20, 2014, 6:21 PM MDT. 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 outline as issued.

The facts

Issued
May 20, 2014, 6:21 PM MDT (00:21 UTC)
Expired
May 20, 2014, 7:00 PM MDT
In force
39 min
Issued by
NWS Riverton, WY

The radar

The Riverton/Lander radar (KRIW), 168 km from the middle of the area, began a volume at 00:22 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.

The nearest sounding before it

Rapid City, SD (KRAP), launched 00:00Z, 0.4 hours before the alert went out and 296 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, Rapid City, SD at 00:00Z on 2014-05-21Temperature 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, Rapid City, SD at 00:00Z on 2014-05-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -59 square meters per square second.1939587897Sfc1 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
1459 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
-59 m²/s²
0-3 km storm-relative helicity
85 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 Riverton, WY wrote its last area forecast discussion before this special weather statement went out at May 20, 1:44 PM MDT, 4 hours 37 minutes earlier.

Area forecast discussion, May 20, 1:44 PM MDT, 4 hours 37 minutes before
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Hazardous weather outlook, May 20, 4:37 AM MDT, 13 hours 44 minutes before
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In the hours before

Special weather statement, May 20, 1:46 PM MDT, 4 hours 35 minutes before
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Special weather statement, May 20, 2:28 PM MDT, 3 hours 53 minutes before
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Special weather statement, May 20, 3:24 PM MDT, 2 hours 57 minutes before
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Special weather statement, May 20, 4:46 PM MDT, 1 hour 35 minutes before
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Special weather statement, May 20, 5:26 PM MDT, 55 minutes before
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Special weather statement, May 20, 6:21 PM MDT, 0 minutes before
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        Please try again in a few minutes.
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The office that day

Everything else NWS Riverton, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 20, 6:49 PM MDTSpecial Weather StatementRIW41 min
May 20, 7:06 PM MDTSpecial Weather StatementRIWJohnson39 min
May 21, 12:18 PM MDTSpecial Weather StatementRIWNatrona57 min
May 21, 1:23 PM MDTSpecial Weather StatementRIWNatrona52 min
May 21, 1:41 PM MDTSevere Thunderstorm WarningRIWNatrona64 min
May 21, 1:54 PM MDTFlash Flood WarningRIWNatrona3 hr
May 21, 1:55 PM MDTFlash Flood WarningRIWNatrona2 hr
May 21, 5:06 PM MDTSpecial Weather StatementRIWTeton39 min

Nearby

Special Weather Statements in Wyoming, 2014Every special weather statement 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.