Alert archive / Nebraska / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 15, NWS Cheyenne, WY

May 7, 2003Cheyenne County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at May 7, 2003, 4:05 PM MDT for Cheyenne County, Nebraska. It was in force for 25 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 7, 2003, 4:05 PM MDT (22:05 UTC)
Expired: May 7, 2003, 4:30 PM MDT
In force: 25 min
Issued by: NWS Cheyenne, WY
Area: Counties, with a storm outline in the text

County Cheyenne County, NE

The radar

The Cheyenne radar (KCYS), 160 km from the middle of the area, began a volume at 22:06 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 7, 3:05 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 10.1 hours before the alert went out and 143 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: 1592 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 32 m²/s²
0-3 km storm-relative helicity: 61 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.

000 
WUUS55 KCYS 072205
SVRCYS
NEC033-072230-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
405 PM MDT WED MAY 7 2003

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN CHEYENNE COUNTY IN THE PANHANDLE OF NEBRASKA
  THIS INCLUDES THE CITY OF SIDNEY

* UNTIL 430 PM MDT

* AT 400 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING DIME SIZE HAIL AND WINDS
  IN EXCESS OF 60 MPH 19 MILES NORTHEAST OF SIDNEY...MOVING NORTHEAST
  AT 15 MPH.

IF SEVERE WEATHER APPROACHES YOUR AREA...GO INSIDE A STURDY SHELTER
AWAY FROM CREEK BEDS AND OTHER FLOOD-PRONE AREAS. REMEMBER...A SEVERE
THUNDERSTORM CAN PRODUCE LARGE DAMAGING HAIL...DAMAGING WINDS IN
EXCESS OF 58 MPH...DEADLY LIGHTNING...AND VERY HEAVY RAIN.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE IN CHEYENNE.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT
WEDNESDAY EVENING FOR THE PANHANDLE OF NEBRASKA.

LAT...LON 4116 10307 4101 10305 4101 10267 4133 10262

STARK

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 Cheyenne, WY wrote its last area forecast discussion before this severe thunderstorm warning went out at May 7, 2:45 PM MDT, 1 hour 20 minutes earlier.

Area forecast discussion, May 7, 2:45 PM MDT, 1 hour 20 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
245 PM MDT WED MAY 7 2003

.SHORT TERM...
SHOWERS AND A FEW TSTRMS DVLPG OVER PARTS OF CWA AHEAD OF UPPER TROF
APPROACHING AREA FROM SW.  EXPECT ACTIVITY TO CONTINUE OVERNIGHT AS
UPPER TROF MOVES INTO COLORADO INDUCING SFC CYCLOGENESIS SOMEWHERE
OVER ERN COLORADO/WRN KS.  SOME SNOW POSS MAINLY MTNS LATER TONIGHT
WITH A MIX OVER S CENTRAL SECTIONS AS THICKNESSES LOWER...BUT ANY
ACCUMULATION SHOULD BE RESTRICTED TO HIGHER PEAKS.  SYSTEM SWINGS BY
THURSDAY MORNING BUT CHC FOR SHWRS AND A FEW TSTRMS WILL CONTINUE
WITH SOME SFC UPSLOPE FLOW AND WEAK INSTABILITY...WITH BEST CHC OVER
WRN AND NRN PARTS OF CWA. TEMPS A LITTLE COOLER THURSDAY WITH
CLOUDCOVER AND NWLY FLOW.

.LONG TERM...700 MB TEMPS SAT-MON PLUNGE TO -4 TO -6C WITH A COUPLE
DEGS COLDER VALUES AT 12 UTC/6 AM SUN...WINTERLIKE VALUES IF MODELS
VERIFY. ETA VALUES ONLY A HAIR LESS PESSIMISTIC THAN GFS.  ETA
SLIGHTLY SLOWER SWINGING UPPER LOW INTO CENTRAL ROCKIES FRI
NIGHT...AT 12 UTC SAT GFS HAS LOW OVER CENTRAL CO WHILE ETA/S
LOW STILL IN SOUTHEAST UT. GFS HAS SOME IMPRESSIVE QPF OVER NORTHEAST
CO LATE FRI NIGHT/EARLY SAT...SPILLING INTO SOUTEAST WY/NEB
PANHANDLE. GFS INDICATES ANOTHER SIGNIFICANT PRECIP EVENT NEXT
TUE/TUE NIGHT AS AN EVEN MORE DEVELOPED STORM MOVES THROUGH CENTRAL
ROCKIES. IN BETWEEN MAIN EVENTS...UNSEASONABLY COOL TEMPS WITH
LINGERING CHANCE OF LIGHT SHOWERY QPF.

.CYS...
WY...NONE.
NE...NONE.

RE/COX

Hazardous weather outlook, May 7, 10:35 AM MDT, 5 hours 30 minutes before

NEZ001>003-019>021-054-055-WYZ059>070-081130-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
1035 AM MDT WED MAY 7 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHEASTERN WYOMING AND THE
WESTERN NEBRASKA PANHANDLE.

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS SHOULD DEVELOP OVER MUCH OF THE
REGION THIS AFTERNOON AND EVENING.  A FEW STORMS OVER FAR SOUTHEAST
WYOMING INTO THE NEBRASKA PANHANDLE COULD GET STRONG ENOUGH TO
PRODUCE SOME SMALL HAIL AND GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

THE THREAT OF SHOWERS AND LATE DAY THUNDERSTORMS WILL CONTINUE
THROUGH THE END OF THE WEEK.

FOR THE WEEKEND...RAIN AND SNOW SHOWERS WILL BE LIKELY IN MOST AREAS
AS YET ANOTHER STRONG WEATHER SYSTEM MOVES INTO THE REGION.  IN
WYOMING THERE COULD BE SOME SNOW ACCUMULATION FRIDAY NIGHT THROUGH
SATURDAY NIGHT...ESPECIALLY ABOVE ABOUT 6500 FEET...ALONG WITH GUSTY
WINDS.  ROADS WILL LIKELY BECOME SLICK OVER THE MOUNTAIN PASSES OF
SOUTHEAST WYOMING DURING THIS TIME FRAME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME.

WCJIN-WYSE-WYNE

The office that day

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

Issued	Product	Office	Counties	Lasted
May 7, 3:57 PM MDT	Severe Thunderstorm Warning	CYS	Kimball	33 min
May 7, 4:31 PM MDT	Severe Thunderstorm Warning	CYS	Morrill	29 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2003 Every severe thunderstorm warning in 2003

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.