Alert archive / Wyoming / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 13, NWS Riverton, WY

July 25, 2012Hot Springs County, Natrona County, Washakie County, Wyoming

NWS Riverton, WY issued this severe thunderstorm warning at Jul 25, 2012, 2:49 PM MDT for Hot Springs County, Natrona County, Washakie County, Wyoming. It was in force for 41 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 25, 2012, 2:49 PM MDT (20:49 UTC)
Expired: Jul 25, 2012, 3:30 PM MDT
In force: 41 min
Issued by: NWS Riverton, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Hot Springs County, WY, Natrona County, WY, Washakie County, WY

The radar

The Riverton/Lander radar (KRIW), 96 km from the middle of the area, began a volume at 20:48 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

Riverton, WY (KRIW), launched 12:00Z, 8.8 hours before the alert went out and 90 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: 47 J/kg
Mixed-layer CIN: -113 J/kg
Mixed-layer LCL: 2010 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: -47 m²/s²
0-3 km storm-relative helicity: 59 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.

483 
WUUS55 KRIW 252049
SVRRIW
WYC017-025-043-252130-
/O.NEW.KRIW.SV.W.0013.120725T2049Z-120725T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE RIVERTON WY
249 PM MDT WED JUL 25 2012

THE NATIONAL WEATHER SERVICE IN RIVERTON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME SOUTHEASTERN HOT SPRINGS COUNTY IN CENTRAL WYOMING...
  NORTHWESTERN NATRONA COUNTY IN CENTRAL WYOMING...
  SOUTHEASTERN WASHAKIE COUNTY IN NORTH CENTRAL WYOMING...

* UNTIL 330 PM MDT

* AT 244 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 6 MILES
  NORTHWEST OF COTTONWOOD PASS...OR 30 MILES EAST OF THERMOPOLIS...
  AND MOVING EAST AT 30 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF EXTREME
  SOUTHEASTERN HOT SPRINGS...NORTHWESTERN NATRONA AND SOUTHEASTERN
  WASHAKIE COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN RIVERTON.

&&

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

LAT...LON 4336 10714 4346 10752 4350 10754 4350 10759
      4347 10760 4350 10772 4369 10766 4363 10714
TIME...MOT...LOC 2049Z 279DEG 27KT 4355 10757
WIND...HAIL 60MPH 1.00IN

$$

SKRBAC

2 follow-up statements

324 
WWUS55 KRIW 252109
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
309 PM MDT WED JUL 25 2012

WYC017-025-043-252130-
/O.CON.KRIW.SV.W.0013.000000T0000Z-120725T2130Z/
NATRONA WY-HOT SPRINGS WY-WASHAKIE WY-
309 PM MDT WED JUL 25 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHEASTERN
WASHAKIE...EXTREME SOUTHEASTERN HOT SPRINGS AND NORTHWESTERN NATRONA
COUNTIES UNTIL 330 PM MDT...

AT 306 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED 17 MILES
NORTHWEST OF RED WALL...OR 32 MILES SOUTHWEST OF KAYCEE...MOVING EAST
AT 35 MPH. THIS SEVERE THUNDERSTORM ALSO EXTENDED WESTWARD BACK INTO
EXTREME SOUTHEASTERN HOT SPRINGS COUNTY. 

VERY HEAVY RAIN UP TO ONE INCH IS ALSO QUITE POSSIBLE WITH THIS 
STORM. SOME LOCALIZED FLOODING IS QUITE POSSIBLE...ESPECIALLY
NEAR ANY SMALL RAVINES OR CREEKS.


LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EXTREME NORTHERN NATRONA AND EXTREME
  SOUTHEASTERN WASHAKIE COUNTIES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR
HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN RIVERTON.

&&

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

LAT...LON 4345 10750 4346 10752 4350 10754 4350 10759
      4347 10761 4350 10771 4353 10772 4367 10767
      4368 10765 4359 10714 4337 10714
TIME...MOT...LOC 2108Z 279DEG 30KT 4350 10718
WIND...HAIL 60MPH 1.00IN

$$

SKRBAC

143 
WWUS55 KRIW 252128
SVSRIW

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE RIVERTON WY
328 PM MDT WED JUL 25 2012

WYC017-025-043-252138-
/O.EXP.KRIW.SV.W.0013.000000T0000Z-120725T2130Z/
NATRONA WY-HOT SPRINGS WY-WASHAKIE WY-
328 PM MDT WED JUL 25 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN WASHAKIE...
EXTREME SOUTHEASTERN HOT SPRINGS AND NORTHWESTERN NATRONA COUNTIES
WILL EXPIRE AT 330 PM MDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
 HOWEVER SMALL HAIL...HEAVY RAIN AND GUSTY WINDS ARE STILL POSSIBLE 
WITH THIS THUNDERSTORM.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN RIVERTON.

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

LAT...LON 4345 10750 4346 10752 4350 10754 4350 10759
      4347 10761 4350 10771 4353 10772 4367 10767
      4368 10765 4359 10714 4337 10714
TIME...MOT...LOC 2128Z 289DEG 28KT 4346 10714

$$

SKRBAC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 25, 1:47 PM MDT	Special Weather Statement	RIW	Hot Springs	43 min
Jul 25, 2:28 PM MDT	Special Weather Statement	RIW	Fremont	47 min
Jul 25, 2:39 PM MDT	Special Weather Statement	RIW	Natrona	66 min
Jul 25, 3:18 PM MDT	Special Weather Statement	RIW	Fremont	42 min
Jul 25, 3:35 PM MDT	Special Weather Statement	RIW		55 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2012 Every severe thunderstorm warning 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.