Alert archive / Wyoming / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 22, NWS Cheyenne, WY

June 7, 2001Laramie County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 7, 2001, 8:40 PM MDT for Laramie County, Wyoming. It was in force for 35 min. 1 report came from 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, with what was reported inside it.

The facts

Issued: Jun 7, 2001, 8:40 PM MDT (02:40 UTC)
Expired: Jun 7, 2001, 9:15 PM MDT
In force: 35 min
Issued by: NWS Cheyenne, WY
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 38 km from the middle of the area, began a volume at 02:39 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
Jun 7, 8:50 PM MDT	Hail 0.88	Carpenter, WY

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 2.7 hours before the alert went out and 169 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: 1603 J/kg
Mixed-layer CIN: -26 J/kg
Mixed-layer LCL: 1210 m above ground
0-6 km bulk shear: 49 kt
0-1 km storm-relative helicity: -10 m²/s²
0-3 km storm-relative helicity: -56 m²/s²
Significant tornado parameter: -0.1
Supercell composite: -0.9

Open this sounding in Storm Lab

The text

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

000 
WUUS55 KCYS 080244
SVRCYS
WYC021-080315-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING...CORRECTED
NATIONAL WEATHER SERVICE CHEYENNE WY
840 PM MDT THU JUN 7 2001

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN LARAMIE COUNTY IN SOUTHEAST WYOMING

* UNTIL 915 PM MDT

* AT 833 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 5 MILES SOUTHWEST OF BURNS...OR ABOUT 20 MILES
  EAST OF CHEYENNE...MOVING SOUTHEAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  OVER BURNS AT 845 PM MDT

* OTHER LOCATIONS IN THE WARNING INCLUDE PINE BLUFFS AND CARPENTER

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

LAT...LON 4119 10454 4102 10453 4101 10406 4125 10407

STARK
WCJIN-WYSE

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 7, 2:39 PM MDT, 6 hours 1 minute earlier.

Area forecast discussion, Jun 7, 2:39 PM MDT, 6 hours 1 minute before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
239 PM MDT THU JUN 7 2001

PRECIPITATION HAVING A TOUGH TIME GETTING GOING THIS AFTERNOON AS
DEWPOINTS HAVE DECREASED OVER MOST OF FORECAST AREA. A WEAK
SHORTWAVE IS PROGGED TO PASS OVER REGION TONIGHT AND WILL MENTION
LOW POPS THIS EVENING OVER THE MOUNTAINS...SOUTHEAST PLAINS AND
WESTERN NEB PANHANDLE. LATE TONIGHT A RIDGE ALOFT WILL AMPLIFY OVER
WYOMING. WILL KEEP MENTION OF LOW CLOUDS REDEVELOPING TONIGHT EAST
OF THE LARAMIE RANGE WITH LIGHT WINDS AND RESIDUAL LOW LEVEL
MOISTURE. TEMPERATURES FRIDAY WILL BE IN THE 70S AND 80S...WITH SOME
90S POSSIBLE IN THE NEB PANHANDLE. LOW POPS WARRANTED FRIDAY WITH
MARGINAL MOISTURE AND WEAK DYNAMICS. RIDGE TO REMAIN OVER REGION
FRIDAY NIGHT AND SATURDAY. TEMPS SATURDAY WILL BE SIMILAR TO THOSE
EXPECTED TOMORROW AS HEIGHTS AND THICKNESS VALUES REMAIN RELATIVELY
HIGH. A WEAK LEESIDE TROUGH IS PROGGED TO DEVELOP AT THE SURFACE
SATURDAY THUS WILL MENTION BREEZY AREAS. WILL AGAIN GO WITH LOW POPS
SATURDAY.

IN THE EXTENDED...MODELS INDICATE RIDGING OVER THE AREA SUNDAY INTO
MONDAY WITH BROAD TROF MOVING INTO THE PACIFIC NORTHWEST. BY LATE
DAY MONDAY THIS TROF WILL BEGIN TO HAVE AN INFLUENCE ON OUR CWA BY
TRIGGERING SOME CONVECTIVE ACTIVITY. COOL DOWN TUESDAY THROUGH THE
END OF THE FORECAST WITH A CHANCE EACH DAY OF SHOWERS OR
THUNDERSTORMS.

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

JR/JRG

In the hours before

Local storm report, Jun 7, 7:00 PM MDT, 1 hour 40 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE WY
700 PM MDT THU JUN 7 2001

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

655& PM        5 W CHEYENNE          WY      0.75 INCH HAIL
06/07/01        LARAMIE

JCH

Local storm report, Jun 7, 7:26 PM MDT, 1 hour 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE, WY
726 PM MDT THU JUN 7 2001

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0655 PM    CARPENTER                 WY   .75 INCH HAIL
06/07/01   LARAMIE

DCC

Local storm report, Jun 7, 7:53 PM MDT, 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE, WY
753 PM MDT THU JUN 7 2001

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0730 PM    CHEYENNE                  WY   .75 INCH HAIL
06/07/01   LARAMIE

DCC

Local storm report, Jun 7, 7:57 PM MDT, 43 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE, WY
757 PM MDT THU JUN 7 2001

TIME(MDT)  .....CITY LOCATION.....STATE   ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0754 PM    PINE BLUFFS               WY   1.00 INCH HAIL
06/07/01   LARAMIE

DCC

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 7, 6:44 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	16 min
Jun 7, 7:03 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	42 min
Jun 7, 7:49 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	26 min
Jun 8, 4:54 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	36 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.