Alert archive / Nebraska / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 71, NWS Cheyenne, WY

July 3, 2012Cheyenne County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 3, 2012, 6:17 PM MDT for Cheyenne County, Nebraska. It was in force for 38 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Jul 3, 2012, 6:17 PM MDT (00:17 UTC)
Expired: Jul 3, 2012, 6:55 PM MDT
In force: 38 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

County Cheyenne County, NE

The radar

The Cheyenne radar (KCYS), 136 km from the middle of the area, began a volume at 00:20 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 was reported inside it

Time	Report	Where	Remark
Jul 3, 6:25 PM MDT	TSTM WND GST 60	7 Wnw Sidney, NE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.3 hours before the alert went out and 134 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3534 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 38 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.

571 
WUUS55 KCYS 040017
SVRCYS
NEC033-040100-
/O.NEW.KCYS.SV.W.0071.120704T0017Z-120704T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
617 PM MDT TUE JUL 3 2012

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN CHEYENNE COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 700 PM MDT

* AT 612 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DESTRUCTIVE WINDS IN   
  EXCESS OF 70 MPH...HEAVY RAINFALL...FREQUENT LIGHTNING AND HAIL UP
  TO ONE HALF INCH IN DIAMETER. THIS STORM WAS LOCATED 6 MILES WEST OF 
  PEETZ COLORADO...OR 17 MILES SOUTHWEST OF SIDNEY...AND MOVING NORTHEAST 
  AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SIDNEY...LORENZO...BROWNSON AND SIDNEY AIRPORT.

THIS INCLUDES INTERSTATE 80 IN NEBRASKA BETWEEN MILE MARKERS 45 AND
63.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE IN THE PATH OF THIS STORM...PREPARE IMMEDIATELY FOR LARGE
HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4101 10336 4130 10314 4114 10285 4099 10303
      4099 10335
TIME...MOT...LOC 0014Z 216DEG 9KT 4099 10322
WIND...HAIL 70MPH <.75IN

$$

MSW

2 follow-up statements

566 
WWUS55 KCYS 040035
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
635 PM MDT TUE JUL 3 2012

NEC033-040100-
/O.CON.KCYS.SV.W.0071.000000T0000Z-120704T0100Z/
CHEYENNE NE-
635 PM MDT TUE JUL 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR SOUTHWESTERN
CHEYENNE COUNTY UNTIL 700 PM MDT...

AT 628 PM MDT...TRAINED WEATHER SPOTTERS REPORTED WIND GUSTS OF 60 MPH
AND VERY HEAVY RAINFALL 7 MILES TO THE WEST NORTHWEST OF SIDNEY. THIS
SEVERE STORM EXTENDED FROM 7 MILES NORTHWEST OF SIDNEY TO 6 MILES TO THE
SOUTHWEST OF SIDNEY. THE STORM WAS MOVING TO THE NORTHEAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  SIDNEY...LORENZO...BROWNSON AND SIDNEY AIRPORT.

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.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4101 10336 4130 10314 4114 10285 4099 10303
      4099 10335
TIME...MOT...LOC 0033Z 216DEG 9KT 4103 10318
WIND...HAIL 60MPH <.75IN

$$

MSW

768 
WWUS55 KCYS 040055
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
655 PM MDT TUE JUL 3 2012

NEC033-040104-
/O.CAN.KCYS.SV.W.0071.000000T0000Z-120704T0100Z/
CHEYENNE NE-
655 PM MDT TUE JUL 3 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CHEYENNE COUNTY
IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

HOWEVER HEAVY RAIN AND WIND GUSTS TO 50 MPH WILL STILL BE POSSIBLE WITH
THE LINE OF STORMS WHICH CURRENTLY EXTENDS FROM SOUTHWEST TO NORTH
CENTRAL CHEYENNE COUNTY. THE STORMS ARE MOVING TO THE NORTHEAST AT 15 MPH.

LAT...LON 4101 10336 4130 10314 4114 10285 4099 10303
      4099 10335
TIME...MOT...LOC 0054Z 214DEG 15KT 4111 10311

$$

MSW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 6:27 PM MDT	Special Weather Statement	CYS	Cheyenne	48 min
Jul 3, 6:57 PM MDT	Special Weather Statement	CYS	Cheyenne	48 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.