Alert archive / Nebraska / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 159, NWS Cheyenne, WY
NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 3, 2009, 7:37 PM MDT for Dawes County, Sioux County, Nebraska. It was in force for 52 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 3, 2009, 7:37 PM MDT (01:37 UTC)
- Expired
- Aug 3, 2009, 8:29 PM MDT
- In force
- 52 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
Counties Dawes County, NE, Sioux County, NE
The radar
The Rapid City radar (KUDX), 176 km from the middle of the area, began a volume at 01:39 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.
The nearest sounding before it
Rapid City, SD (KUNR), launched 00:00Z, 1.6 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.
- Mixed-layer CAPE
- 1 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3433 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- -17 m²/s²
- 0-3 km storm-relative helicity
- 114 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
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 Aug 3, 1:54 PM MDT, 5 hours 43 minutes earlier.
Area forecast discussion, Aug 3, 1:54 PM MDT, 5 hours 43 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE CHEYENNE WY 154 PM MDT MON AUG 3 2009 .SHORT TERM...TONIGHT THROUGH WEDNESDAY AN UPPER RIDGE EXTENDING FROM THE SOUTHERN ROCKIES TO THE PAC NW WILL STRENGTHEN THROUGH TUES. THE UPPER RIDGE AXIS WILL MOVE ACROSS THE CWA ON WED. A WEAK FRONTAL BOUNDARY WILL MOVE ACROSS THE FORECAST AREA THIS EVENING...WITH A WIND SHIFT BEING THE MAIN RESULT. SURFACE WINDS WILL BECOME NORTH TONIGHT...THEN E TO SE TUES. DRY CONDITIONS WILL PREVAIL AT THE LOWER LEVELS WITH SOME MID LEVEL MOISTURE PRESENT THROUGH THE PERIOD. THIS AFTERNOON AND EVENING...LIS ARE FORECAST TO BE FROM 0 TO -3 WITH CAPES OF 1000 TO 1500 J/KG. DO NOT BELIEVE MUCH SEVERE WEATHER WILL OCCUR...HOWEVER A FEW STORMS COULD REACH SEVERE CRITERIA BASED ON WIND GUSTS. FOR TUES AND WED...HOWEVER...LIS IN THE NEB PANHANDLE ARE FORECAST TO BE FROM -4 TO -6 WITH CAPE VALUES OF 2000 TO 2500 J/KG. WITH DRY LOWER LEVELS AND SOMEWHAT MOIST MID LEVEL...WILL LIKELY SEE SOME SEVERE STORMS IN THE NEBRASKA PANHANDLE BOTH TUES AND WED WITH STRONG WIND GUSTS AND LARGE HAIL. HIGH TEMPERATURES WILL BE FROM 4 TO 6 DEGREES ABOVE NORMAL BOTH TUES AND WED. .LONG TERM...WEDNESDAY NIGHT THROUGH MONDAY. MAJOR SHIFT IN SYNOPTIC PATTERN THROUGH THE LONG TERM PERIOD. LARGE RIDGE OVER THE WEST WILL BREAK DOWN AND SHIFT EAST ON THURSDAY AND FRIDAY...AS LOW/TROUGH OFF THE CALIFORNIA COAST MOVES INLAND. ASSOCIATED PACIFIC COLD FRONT WILL MOVE RAPIDLY EAST THROUGH THE AREA FRIDAY NIGHT...SETTING UP A ENHANCED CHANCE OF SHOWERS AND STORMS FRIDAY AFTERNOON AND EVENING. SHORT WAVES WILL MOVE THROUGH IN THE SOUTHWEST FLOW ON SATURDAY AND AGAIN ON SUNDAY...WITH SHOWERS AND STORMS CONTINUING FOR THE WEEKEND INTO EARLY NEXT WEEK. ABOVE NORMAL TEMPERATURES ARE EXPECTED THROUGH THE ENTIRE PERIOD. && .AVIATION...VFR CONDITIONS WILL OCCUR ACROSS THE AREA THROUGH WEDNESDAY WITH THE EXCEPTION OF AREAS IN AND NEAR LATE DAY THUNDERSTORMS...WHERE MVFR CONDITIONS WILL OCCUR. && .FIRE WEATHER...BORDER LINE RED FLAG CONDITIONS ARE OCCURRING AT THE MOMENT IN THE NORTHERN LARAMIE RANGE AND ACROSS CARBON COUNTY. WINDS WILL SUBSIDE AT SUNSET AND A WEAK FRONTAL BOUNDARY WILL MOVE ACROSS THE AREA. THIS WILL RESULT IN SLIGHTLY BETTER RH RECOVERY THAN LAST NIGHT. TUES AND WED WILL BE CONTINUED HOT AND DRY WITH BREEZY CONDITIONS. ISOLATED...MAINLY DRY THUNDERSTORMS WITH GUSTY WINDS WILL OCCUR IN THE AFTERNOONS AND EVENINGS. CONDITIONS WILL NEED TO BE MONITORED CLOSELY OVER THE NEXT SEVERAL DAYS FOR POSSIBLE FIRE WEATHER HIGHLIGHTS. && .CYS WATCHES/WARNINGS/ADVISORIES... WY...NONE. NE...NONE. && SHORT TERM/AVIATION...KMD LONG TERM...EISE
Hazardous weather outlook, Aug 3, 9:50 AM MDT, 9 hours 47 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE CHEYENNE WY 950 AM MDT MON AUG 3 2009 NEZ001>003-019>021-054-055-WYZ059>070-041100- SIOUX-DAWES-BOX BUTTE-SCOTTS BLUFF-BANNER-MORRILL-KIMBALL- CHEYENNE-CONVERSE-NIOBRARA-SOUTHWEST CARBON-NORTH CARBON- SNOWY RANGE-NORTH LARAMIE RANGE-LARAMIE VALLEY-LARAMIE RANGE- PLATTE-GOSHEN-CHEYENNE FOOTHILLS-PINE BLUFFS- 950 AM MDT MON AUG 3 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE WESTERN NEBRASKA PANHANDLE AND SOUTHEAST WYOMING. .DAY ONE...TODAY AND TONIGHT ISOLATED THUNDERSTORMS WILL OCCUR ACROSS THE AREA THIS AFTERNOON. SOME OF THESE THUNDERSTORMS MAY PRODUCE GUSTY WINDS TO 45 MPH. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY THUNDERSTORM CHANCES WILL CONTINUE EACH AFTERNOON FROM TUESDAY THROUGH FRIDAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY AND TONIGHT. && THIS PRODUCT...ALONG WITH OTHER WEATHER...HYDROLOGIC...AND CLIMATE INFORMATION IS AVAILABLE ON THE WEB AT... HTTP://WEATHER.GOV/CHEYENNE
In the hours before
Local storm report, Aug 3, 5:58 PM MDT, 1 hour 39 minutes before
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</html>Special weather statement, Aug 3, 6:06 PM MDT, 1 hour 31 minutes before
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</html>Special weather statement, Aug 3, 6:45 PM MDT, 52 minutes before
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</html>Local storm report, Aug 3, 6:52 PM MDT, 45 minutes before
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</html>Special weather statement, Aug 3, 7:06 PM MDT, 31 minutes before
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</html>Nearby
Severe Thunderstorm Warnings in Nebraska, 2009Every severe thunderstorm warning in 2009
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.