Alert archive / Wyoming / Severe Thunderstorm Warnings in 2003

Severe Thunderstorm Warning 33, NWS Cheyenne, WY

May 30, 2003Albany County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at May 30, 2003, 5:04 PM MDT for Albany County, Wyoming. It was in force for 41 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 30, 2003, 5:04 PM MDT (23:04 UTC)
Expired: May 30, 2003, 5:45 PM MDT
In force: 41 min
Issued by: NWS Cheyenne, WY
Area: Counties, with a storm outline in the text

County Albany County, WY

The radar

The Cheyenne radar (KCYS), 120 km from the middle of the area, began a volume at 23:05 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 30, 4:05 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 11.1 hours before the alert went out and 247 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: 2797 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 45 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.

721 
WUUS55 KCYS 302304
SVRCYS
WYC001-302345-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
503 PM MDT FRI MAY 30 2003

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  CENTRAL AND NORTHERN ALBANY COUNTY IN SOUTHEAST WYOMING

* UNTIL 545 PM MDT

* AT 455 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL AND WINDS
  IN EXCESS OF 60 MPH OVER CENTRAL ALBANY COUNTY...OR ABOUT 40 MILES
  NORTHWEST OF LARAMIE...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 1000 PM MDT
FRIDAY EVENING FOR THE PANHANDLE OF NEBRASKA AND SOUTHEAST WYOMING.

LAT...LON 4186 10603 4174 10585 4194 10547 4220 10572

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 30, 3:05 PM MDT, 1 hour 59 minutes earlier.

Area forecast discussion, May 30, 3:05 PM MDT, 1 hour 59 minutes before

ZCZC CYSWRKAFD ALL
TTAA00 KCYS 181738

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE CHEYENNE WY
145 PM MDT FRI MAY 30 2003

SHORT TERM...SEVERAL CONCERNS IN THE SHORT TERM.  88D NOT SHOWING
MUCH AS OF THIS WRITING BUT GUIDANCE SHOWING HIGHER POPS THAN GOING
FORECAST SO MAY NEED TO BUMP THEM UP ESPECIALLY IN THE SOUTHERN
PORTIONS OF THE CWA.  LIS AND CAPES WOULD SUGGEST TSRA
DEVELOPMENT  THIS AFTERNOON AND EVENING. SECONDLY WITH THE
POSSIBILITY OF LOCALLY HEAVY RAIN AND RAPID SNOW MELT...MBRFC IS
CONCERNED WITH LARAMIE RIVER POSSIBLY EXCEEDING FLOOD STAGE.

TRANSITORY 500H RIDGE TO CROSS CWA TONIGHT WITH PVA MOVING IN
BEHIND IT BY LATE TONIGHT AND EARLY MORNING HOURS.  THIS FEATURE
WILL BE THE TRIGGER FOR INCREASING THE POPS IN THE SOUTH.  GUIDANCE
ACTUALLY SHOWING HIGHER POPS AFTER MIDNIGHT THAN WITH THIS EVENINGS
CONVECTIVE ACTIVITY.  BY SATURDAY EVENING CWA BACK UNDER NW FLOW.
THE SFC PATTERN SHOWS HIGH PRESSURE TO THE E/NE WHICH WILL PROVIDE
SE/S FLOW NEXT 36 HOURS. THIS WILL INCREASE THE LOW LEVEL RH
RAPIDLY BY SATURDAY MORNING.  SOME AREAS EAST OF THE MOUNTAINS WILL
SEE LOW CLOUDS AND THIS AGAIN WILL PROVIDE ENOUGH LOW LEVEL MOISTURE
AND ALONG WITH THE FORECAST LIS/CAPE FOR MORE CONVECTION TOMORROW.

LONG TERM...UPPER FLOW DEVELOPS WESTERLY COMPONENT FROM SAT-SUN AS
STRONGER VORTICITY LOBES MOVE THROUGH. FLOW WILL HAVE SURFACE FEATURE
NEAR CONTINENTAL DIVIDE TO INTERACT WITH. BOTH ETA/AVN HAVE 0.1 TO
0.25 QPF AMOUNTS AT TIMES DURING PERIOD. UPPER FLOW RETURNS TO
NORTHWESTERLY FOR START OF WORKWEEK AND BECOMES NORTHERLY FOR LATER
PART OF WEEK WITH RESULTING SIGNIFICANT COOLING ALOFT/THICKNESSES.
BY MIDWEEK DRY BUT THREAT FROST POSSIBLE...ESPECIALLY LARAMIE/RAWLINS.

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

GRIFFITH/COX

Hazardous weather outlook, May 30, 9:53 AM MDT, 7 hours 11 minutes before

NEZ001>003-019>021-054-055-WYZ059>070-311130-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE CHEYENNE WY
953 AM MDT FRI MAY 30 2003

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

.DAY ONE...TODAY AND TONIGHT

SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP IN THE AFTERNOON
WITH THE SHOWERS BECOMING MORE WIDESPREAD DURING THE EVENING.  DUE
TO COOLER AIR MOVING IN FROM THE NORTHEAST...THE BEST INSTABILITY
WILL BE SOUTH OF A DOUGLAS WYOMING TO SIDNEY NEBRASKA LINE.  THE
MAIN THREAT TODAY APPEARS TO BE DOWNBURST WINDS THAT COULD EXCEED 60
MPH AND CAUSE VERY LOCALIZED DAMAGE.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

ONLY A FEW THUNDERSTORMS ARE EXPECTED SATURDAY AFTERNOON AND EVENING
WITH THESE FORMING ALONG AND EAST OF INTERSTATE 25.  ONE OR TWO
COULD AGAIN PRODUCE SOME SMALL HAIL OVER THE PLAINS OF SOUTHEAST
WYOMING WITH AN ISOLATED SEVERE EVENT NOT OUT OF THE QUESTION.  ANOTHER
CHANCE OF THUNDERSTORMS WILL OCCUR BOTH SUNDAY AND MONDAY AFTERNOON
AND EVENING.  EVEN COOLER TEMPERATURES WILL MOVE IN TUESDAY ALONG
WITH A CHANCE OF SHOWERS AND A FEW THUNDERSTORMS.  DRY AND RATHER
COOL CONDITIONS ARE EXPECTED WEDNESDAY AND THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NEEDED LATER THIS AFTERNOON AND EVENING.

GRIFFITH

In the hours before

Local storm report, May 30, 3:41 PM MDT, 1 hour 23 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE, WY
341 PM MDT FRI MAY 30 2003

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

0333 PM    4 SE LARAMIE              WY   .75 INCH HAIL
05/30/03   ALBANY                         *** 0 INJ ***

0305 PM    4 SE LARAMIE              WY   .75 INCH HAIL
05/30/03   ALBANY

Local storm report, May 30, 3:41 PM MDT, 1 hour 23 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE CHEYENNE WY
341 PM MDT FRI MAY 30 2003

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

0305 PM    4 SE LARAMIE              WY   .75 INCH HAIL
05/30/03   ALBANY

Local storm report, May 30, 4:18 PM MDT, 46 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE CHEYENNE, WY
418 PM MDT FRI MAY 30 2003

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

0410 PM    20 W CHEYENNE             WY   .75 INCH HAIL
05/30/03   LARAMIE

GRIFFITH

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 3:04 PM MDT	Severe Thunderstorm Warning	CYS	Albany	26 min
May 30, 3:52 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	23 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 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.