Alert archive / Nebraska / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 304, NWS Hastings, NE
NWS Hastings, NE issued this severe thunderstorm warning at Aug 21, 2011, 9:08 AM CDT for Sherman County, Valley 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 21, 2011, 9:08 AM CDT (14:08 UTC)
- Expired
- Aug 21, 2011, 10:00 AM CDT
- In force
- 52 min
- Issued by
- NWS Hastings, NE
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 50.0 mph
Counties Sherman County, NE, Valley County, NE
The radar
The Grand Island radar (KUEX), 128 km from the middle of the area, began a volume at 14:08 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
N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 2.1 hours before the alert went out and 139 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
- 669 J/kg
- Mixed-layer CIN
- -149 J/kg
- Mixed-layer LCL
- 561 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 161 m²/s²
- 0-3 km storm-relative helicity
- 204 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 2.5
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 Hastings, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 21, 6:43 AM CDT, 2 hours 25 minutes earlier.
Area forecast discussion, Aug 21, 6:43 AM CDT, 2 hours 25 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE HASTINGS NE 643 AM CDT SUN AUG 21 2011 .AVIATION...12Z KGRI TAF. ALTHOUGH FAIRLY LOW CONFIDENCE CONTINUES TO RULE MUCH OF THE PERIOD WITH REGARD TO CIG/VSBY AND EVEN THUNDERSTORM TRENDS...CONFIDENCE IS HIGH THAT VLIFR CIG/VSBY IN DENSE FOG WILL PERSIST FOR AT LEAST THE FIRST 1-2 HOURS THIS MORNING. THEREAFTER...CONTINUED TO LEAN TOWARD GFS LAMP NUMERICAL GUIDANCE FOR TIMING A GRADUAL RETURN TO MVFR CIG/VSBY LATER THIS MORNING AND EVENTUALLY VFR BY EARLY TO MID AFTERNOON. A COMPLICATING FACTOR THAT COULD ACTUALLY AID IN IMPROVING CIG/VSBY SOONER THAN INDICATED IS A SMALL COMPLEX OF THUNDERSTORMS CURRENTLY WORKING TOWARD THE AREA FROM NORTH CENTRAL NEBRASKA. IF THESE STORMS HOLD TOGETHER...THEY WOULD POTENTIALLY ARRIVE AT KGRI BY MID MORNING...AND HAVE INTRODUCED -TSRA IN A TEMPO GROUP. ONCE ANY MORNING SHOWERS/STORMS MOVE BY...THERE IS A LEGITIMATE CHANCE THAT THE REMAINDER OF THE PERIOD COULD REMAIN STORM FREE...WITH THE BETTER CHANCES FOR AFTERNOON REDEVELOPMENT FOCUSING TO THE WEST...AND BETTER CHANCES FOR LATE NIGHT THUNDERSTORMS FOCUSING EAST. AS A RESULT...LEFT OUT ALL FORMAL MENTION OF THUNDERSTORM ACTIVITY DURING THE LATTER 12-18 HOURS OF THE PERIOD...BUT DID GO WITH A CB CLOUD GROUP MENTION TO ACKNOWLEDGE THE SLIGHT POSSIBILITY. THERE REMAINS PLENTY OF UNCERTAINTY REGARDING CIG/VSBY IN THE 06-12Z PERIOD TONIGHT. ALTHOUGH NOT EXPECTING A DENSE FOG REPEAT THANKS TO BETTER LOW LEVEL MIXING...MVFR VSBY LOOKS POSSIBLE. NOT ANTICIPATING A LOW BKN/OVC CIG HOWEVER AT THIS POINT. BREEZES THROUGH THE PERIOD WILL AVERAGE FROM THE SOUTHEAST AT 5-10KT. && .PREV DISCUSSION... /ISSUED 424 AM CDT SUN AUG 21 2011/ DISCUSSION...THE BIG PICTURE FOR THE WEEK AHEAD CENTERS AROUND WARMER TO EVEN HOT CONDITIONS WITH ONLY A FEW SMALL CHANCES AT SEEING PRECIPITATION. A WEAK SHORTWAVE IS RIDING SOUTHEAST OUT OF SOUTHWESTERN SOUTH DAKOTA THIS MORNING AND SEVERAL FORECAST MODELS ARE HINTING AT ISOLATED SHOWER AND THUNDERSTORM DEVELOPMENT LATER THIS MORNING ACROSS THE SANDHILLS AND INTO AREAS PRIMARILY NORTH OF INTERSTATE 80. THERE ARE INDICATIONS OF AN ENHANCED LOW LEVEL JET AND INCREASED MOISTURE TRANSPORT WITH THIS SYSTEM AND WILL BE GOING WITH SLIGHT POPS FOR MAINLY ISOLATED SHOWERS AND THUNDERSTORMS DURING THE LATE MORNING INTO THE EARLY AFTERNOON HOURS. THE SLIGHT POPS EXPAND ACROSS THE AREA THIS AFTERNOON BUT THIS AGAIN APPEARS TO BE A VERY SMALL CHANCE OF PRECIPITATION WITH MOST LOCATIONS REMAINING DRY. ADDITIONAL VORT MAXES WILL RIDE OVER THE SOUTHERN PLAINS RIDGE AND NEAR OUR AREA TONIGHT. HOWEVER...THE MOST RECENT MODEL RUNS SHOW THE BEST FOCUS FOR THUNDERSTORMS TONIGHT WILL SPLIT EITHER SIDE OF OUR AREA...TO THE NORTHEAST AND SOUTHWEST BASED ON THE PROJECTED VORT TRACKS. CONSEQUENTLY...HAVE LOWERED POPS FOR TONIGHT...WITH RAIN CHANCES ONLY IN THE SLIGHT CATEGORY...WHICH MEANS MOST LOCATIONS WILL CONTINUE TO STAY DRY. HIGH TEMPERATURES TODAY WILL BE WARMER THAN YESTERDAY AND RANGE FROM THE MID 80S ACROSS CENTRAL NEBRASKA TO AROUND 90 OVER NORTH CENTRAL KANSAS. THE UPPER LEVEL RIDGE WILL STILL BE SITUATED OFF TO OUR SOUTHWEST ON MONDAY ALLOWING FOR A SLIGHT CHANCE OF PRECIPITATION AS WEAK VORT MAXES RIDE AROUND THE RIDGE. TEMPERATURES WILL CONTINUE TO INCREASE WITH MOST LOCATIONS REACHING INTO THE UPPER 80S TO AROUND 90. THE UPPER LEVEL RIDGE WILL BUILD NORTHWARD TUESDAY AND REMAIN ENTRENCHED ACROSS THE AREA THROUGH AT LEAST THE END OF THE WEEK IF NOT LONGER. AFTERNOON HIGH TEMPERATURES WILL SOAR UNDER THIS RIDGE AND EXPECT WIDESPREAD 90S FOR HIGHS FOR SEVERAL DAYS WITH LITTLE IF ANY CHANCE OF RAIN. && .GID WATCHES/WARNINGS/ADVISORIES... NE...NONE. KS...NONE. && AVIATION...PFANNKUCH FORECAST DISCUSSION...WESELY
Hazardous weather outlook, Aug 21, 5:14 AM CDT, 3 hours 54 minutes before
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</html>In the hours before
Special weather statement, Aug 21, 8:41 AM CDT, 27 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE HASTINGS NE
841 AM CDT SUN AUG 21 2011
NEZ039-046-211430-
SHERMAN NE-VALLEY NE-
841 AM CDT SUN AUG 21 2011
...SIGNIFICANT WEATHER ADVISORY FOR VALLEY AND NORTHERN SHERMAN
COUNTIES UNTIL 930 AM CDT...
AT 840 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 5 MILES SOUTHEAST OF TAYLOR...OR 21 MILES WEST OF
ORD...MOVING SOUTHEAST AT 30 MPH.
HAIL UP TO THE SIZE OF NICKELS IS EXPECTED WITH THIS STORM.
LOCATIONS NEAR THE PATH OF THIS STORM INCLUDE...
ARCADIA...
LAT...LON 4148 9880 4131 9904 4148 9922 4174 9922
4174 9921 4174 9917
TIME...MOT...LOC 1341Z 317DEG 25KT 4171 9931
HEINLEINThe office that day
Everything else NWS Hastings, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 21, 8:41 AM CDT | Special Weather Statement | GID | Valley | 49 min |
| Aug 21, 9:57 AM CDT | Severe Thunderstorm Warning | GID | Buffalo, Hall, Howard, Sherman | 48 min |
| Aug 21, 11:28 AM CDT | Severe Thunderstorm Warning | GID | Greeley, Valley | 47 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 2011Every severe thunderstorm warning in 2011
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.