Alert archive / Nebraska / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 27, NWS Cheyenne, WY

June 9, 2001Dawes County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 9, 2001, 12:47 AM MDT for Dawes County, Nebraska. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Jun 9, 2001, 12:47 AM MDT (06:47 UTC)
Expired: Jun 9, 2001, 1:15 AM MDT
In force: 28 min
Issued by: NWS Cheyenne, WY
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Dawes County, NE

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 6.8 hours before the alert went out and 133 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: 1061 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 1371 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 124 m²/s²
0-3 km storm-relative helicity: 195 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 6.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

399 
WUUS55 KCYS 090649
SVRCYS
NEC045-090715-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
1247 AM MDT SAT JUN 9 2001

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN DAWES COUNTY IN THE PANHANDLE OF NEBRASKA
  THIS INCLUDES THE CITY OF CHADRON

* UNTIL 115 AM MDT

* AT 1245 AM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 16 MILES NORTHWEST OF CHADRON...MOVING 
  EAST AT 20 MPH.

THIS WARNING REPLACES THE PREVIOUSLY ISSUED WARNING FOR NORTHWEST DAWES
COUNTY.  HAIL TO ONE INCH IN DIAMETER AND WIND GUSTS TO 65 MPH ARE 
POSSIBLE WITH THIS SEVERE STORM.  

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 55 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.

WEILAND 

LAT...LON 4298 10335 4276 10331 4275 10282 4299 10284

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 Jun 8, 2:00 PM MDT, 10 hours 47 minutes earlier.

Area forecast discussion, Jun 8, 2:00 PM MDT, 10 hours 47 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
200 PM MDT FRI JUN 8 2001

TWO S/WV TROFS EVIDENT ON WV IMAGERY...ONE OVER UT/SRN ID AND
ANOTHER OVER SW CO.  LOW LVL MSTR BEING ADVECTED INTO THE NE
PANHANDLE BY SOUTHEAST BLYR FLOW /DWPTS UPR 50S TO LOWER 60S/.  LAPS
ALREADY SHOWING LI/S OF -5 TO -7 OVR ERN PARTS OF THE FA.  SCT TSTMS
WL DVLP LATER TODAY WITHIN THE H8 MSTR GRADIENT OVR ERN PARTS OF THE
FA /CYS DWPT 43 DEGF...CDR DWPT 64 DEGF/.  MORE NUMEROUS ACTIVITY
MAY DVLP CLOSER TO S/WV ENERGY OVR NE WYOMING...AND THEN PUSH
SOUTHEAST ON THE ERN SIDE OF THE UPR RIDGE.  BEST SVR POTENTIAL
APPEARS TO BE OVR THE PANHANDLE...WHERE 0-6KM SHEAR AND LOW LVL MSTR
ARE THE MOST IMPRESSIVE.  LATER TONIGHT...LOW CLDS/FOG ONCE AGAIN A
POSSIBILITY OVER THE SRN PANHANDLE AS 35KT H8 FLOW BRINGS LOW LVL
MSTR NORTHWARD OUT OF ERN CO.

STATUS QUO WX PATTERN FOR THE WEEKEND.  UPR TROF PUSHES TOWARD THE
PACIFIC NW...WHILE BROAD W/SW UPR FLOW W/ EMBEDDED S/WVS CONTS OVR
THE FA.  THE MORE DOMINATE WESTERLY FLOW WL HELP TO ADVECT DRIER AIR
INTO THE REGION...PUSHING MOST OF THE TSTM THREAT EAST OF THE FA
INTO THE PLAINS.  WL USE ISOLD WORDING FOR THE WY ZONES...WITH 20%
POPS IN THE PANHANDLE WHERE SLIGHTLY HIER H8 DWPTS ARE PRESENT.
MOST LIKELY THE WARMEST TEMPS OF THE YEAR THUS FAR SAT/SUN AS H7
THERMAL RIDGE MOVES ACRS THE AREA /H7 TEMPS +14 TO +16 DEGC/.

.EXTENDED DISCUSSION...
RATHER ACTIVE PATTERN IN THE EXTENDED PERIOD.  A CLOSED UPR LOW
WILL MOVE FROM PUGET SOUND EASTWARD ALONG THE CANADIAN BORDER MONDAY
AND TUESDAY.  WEAK S/WVS WILL MOVE RAPIDLY NORTHEAST OVER THE
CENTRAL ROCKIES AND HIGH PLAINS WITH A CHANCE OF SHWRS AND TSTMS
MONDAY AND TUESDAY.  WEDNESDAY WILL BE COOLER AND REMAIN UNSETTLED
AS A VORTICITY LOBE ROTATING DOWN THE BACKSIDE OF THE UPR LOW PUSHES
A BACKDOOR COLD FRONT THROUGH THE AREA.  NORTHWEST FLOW ALOFT WILL
DEVELOP THURSDAY WITH VORT MAXIMA CONTG TO MOVE RAPIDLY OVER THE
AREA.  FLOW ALOFT WILL BACK TO ZONAL FRIDAY WITH WEAK PACIFIC
SHORTWAVE ENERGY MOVING OVER THE AREA.  TEMPERATURES WILL WARM
THURSDAY AND FRIDAY WITH A CONTINUING CHANCE OF PRECIPITATION.

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

JK/JMR

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 9, 12:00 AM MDT	Severe Thunderstorm Warning	CYS	Dawes	45 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2001 Every severe thunderstorm warning in 2001

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.