Alert archive / Wyoming / Severe Thunderstorm Warnings in 2002

Severe Thunderstorm Warning 18, NWS Rapid City, SD

June 2, 2002Weston County, Wyoming

NWS Rapid City, SD issued this severe thunderstorm warning at Jun 2, 2002, 6:41 PM MDT for Weston County, Wyoming. It was in force for 49 min. 1 report came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: Jun 2, 2002, 6:41 PM MDT (00:41 UTC)
Expired: Jun 2, 2002, 7:30 PM MDT
In force: 49 min
Issued by: NWS Rapid City, SD
Area: Counties, with a storm outline in the text

County Weston County, WY

What was reported inside it

Time	Report	Where	Remark
Jun 2, 7:00 PM MDT	Hail 0.75	Rochelle, 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 watch it was issued in

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

Issued	Product	Office	Lasted
Jun 2, 2:00 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 0.7 hours before the alert went out and 137 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: 126 J/kg
Mixed-layer CIN: -396 J/kg
Mixed-layer LCL: 872 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 101 m²/s²
0-3 km storm-relative helicity: 196 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

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 Rapid City, SD wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 2, 1:50 PM MDT, 4 hours 51 minutes earlier.

Area forecast discussion, Jun 2, 1:50 PM MDT, 4 hours 51 minutes before

AREA FORECAST DISCUSSION FOR WESTERN SD AND NORTHEASTERN WY
NATIONAL WEATHER SERVICE RAPID CITY
150 PM MDT SUN JUN 02 2002

...THREAT OF SVR WX AGAIN TONIGHT...

UPR LVL LOW ACRS NRN ROCKIES...WITH BROAD SW FLOW ALOFT ACRS NRN
PLAINS. SFC TROF EXTENDS FROM ERN WY INTO ERN MT. MAIN CONCERN SVR
WX THREAT TONIGHT.

18Z RUC INDICATING MORE INSTABILITY THAN PREVIOUS RUNS...WITH MUCAPE
RISING TO 2000-2500 J/KG ACRS NERN WY. CAP HAS ERODED THIS AREA AND
CONVECTION ALREADY TAKING PLACE JUST W OF CWFA AS STRONG SHORT WAVE
APPROACHES.  LATEST PROGGED HODOGRAPHS FAVOR SPLITTING SUPERCELLS.
LCLS A BIT TOO HIGH TO SUPPORT MUCH TORNADIC DEVELOPMENT.
INSTABILITY AXIS THEN MOVES ACRS BLACK HILLS AND SWRN SD THIS EVE
WHERE FOCUS OF ACTIVITY WILL SHIFT. MOISTURE IS CERTAINLY IN PLACE
(52F DEWPOINT AT KCUT AT 19Z). CAPPING STILL QUITE STRONG ACROSS S
CNTRL BUT LIKE LAST NIGHT EXPECT STRONG FORCING TO OVERCOME.  LESS
INSTABILITY FOR NORTHERN ZONES...SO EXPECT MOST ACTIVITY TO OCCUR
GENERALLY SOUTH I-90.

AS UPPER LOW MOVES ACRS NRN PLAINS ON MON-TUE COOLER AIR WILL FILTER
INTO AREA AND UNSETTLED WX WILL CONTINUE...ALTHOUGH THREAT OF STRONG
CONVECTION WILL BE ON THE DECREASE.  UPR RIDGING THEN BUILDS BACK
INTO REGION WED FOR BEGINNING OF WARMING TREND.

EXTENDED...DRY AND WARMER THRU THU...WITH SW FLOW RETURNING ON FRI.
STRONG UPR TROF WORKS ACRS NRN PLAINS FRI-SUN FOR COOLING TREND AND
UNSETTLED WX.  PROGGED STRENGTH OF TROF/COLD AIR QUITE IMPRESSIVE
FOR THIS TIME OF YEAR...BUT THEN AGAIN ITS SEVERAL DAYS OUT.

.UNR...SVR TSTM WATCH NERN WY.
JOHNSON

In the hours before

Local storm report, Jun 2, 5:16 PM MDT, 1 hour 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE RAPID CITY SD
516 PM MDT SUN JUN 02 2002

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

0350 PM    16 NW WRIGHT              WY   .88 INCH HAIL
06/02/02   CAMPBELL

0410 PM    7 S WYODAK                WY   1 INCH HAIL
06/02/02   CAMPBELL

0429 PM    6 S ROZET                 WY   .75 INCH HAIL
06/02/02   CAMPBELL

0430 PM    12 W UPTON                WY   .75 INCH HAIL
06/02/02   WESTON

0437 PM    12 W UPTON                WY   1 INCH HAIL
06/02/02   WESTON

0445 PM    NEW HAVEN                 WY   WIND DAMAGE
06/02/02   CROOK                          6 INCH TREE BRANCH
                                          BLOWN DOWN

0501 PM    8 NW MOORCROFT            WY   60 MPH TSTM GUST
06/02/02   CROOK                          PINE HAVEN/KEYHOLE
                                          RESERVIOR

0510 PM    1 NW UPTON                WY   .88 INCH HAIL
06/02/02   WESTON                         LARGE DRIFTS OF HAIL

The office that day

Everything else NWS Rapid City, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 2, 8:02 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River	58 min
Jun 2, 9:00 PM MDT	Severe Thunderstorm Warning	UNR	Custer, Fall River	45 min
Jun 2, 10:05 PM MDT	Severe Thunderstorm Warning	UNR		40 min
Jun 2, 6:13 PM MDT	Severe Thunderstorm Warning	UNR	Weston	47 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2002 Every severe thunderstorm warning in 2002

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.