Alert archive / Nebraska / High Wind Watches in 2009
High Wind Watch 1, NWS North Platte, NE
NWS North Platte, NE issued this high wind watch at Sep 30, 2009, 2:35 AM MDT for 16 counties in Nebraska. It took effect at Oct 1, 2009, 9:00 AM MDT. It was in force for .
The area
The counties it named.
The facts
- Issued
- Sep 30, 2009, 2:35 AM MDT (08:35 UTC)
- In effect from
- Oct 1, 2009, 9:00 AM MDT
- Expired
- Oct 1, 2009, 2:51 AM MDT
- In force
- Issued by
- NWS North Platte, NE
Counties Arthur County, NE, Chase County, NE, Cherry County, NE, Deuel County, NE, Frontier County, NE, Garden County, NE, Grant County, NE, Hayes County, NE, Hooker County, NE, Keith County, NE, Lincoln County, NE, Logan County, NE, McPherson County, NE, Perkins County, NE, Sheridan County, NE, Thomas County, NE
The radar
The North Platte radar (KLNX), 89 km from the middle of the area, began a volume at 08:40 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
Denver, CO (KDNR), launched 00:00Z, 8.6 hours before the alert went out and 233 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 4431 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 0 m²/s²
- 0-3 km storm-relative helicity
- 40 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this high wind watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS North Platte, NE wrote its last area forecast discussion before this high wind watch went out at Sep 30, 2:28 AM MDT, 7 minutes earlier.
Area forecast discussion, Sep 30, 2:28 AM MDT, 7 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORTH PLATTE NE 328 AM CDT WED SEP 30 2009 .SYNOPSIS... A STRONG STORM SYSTEM WILL ORGANIZE NEAR THE FOOTHILLS TODAY AND MOVE EAST ONTO THE PLAINS BRINGING A MIXTURE OF WEATHER FROM A CHANCE OF SEVERE THUNDERSTORMS LATE THIS AFTERNOON INTO THE EVENING TO STRONG WINDS THURSDAY. && .DISCUSSION... SEVERAL FORECAST CHALLENGES EXIST IN THE NEAR TERM. MODELS ARE SIMILAR IN THE PATH TAKEN BY THE STORM SYSTEM OVER THE NEXT 24 HOURS BUT VARY IN SEVERAL AREAS THAT CREATE POTENTIAL SPREADS FOR TEMPERATURES...CLOUDS AND PRECIPITATION. THE GFS WOULD KEEP ALL PRECIP LIQUID WHILE NAM DRAWS COLDER AIR SOUTH COMBINED WITH DYNAMIC COOLING THAT COULD GENERATE A MIXTURE OF RAIN AND SNOW IN THE NORTHWEST ZONES. GIVEN SPREAD...I USED A BLEND OF THE MODELS THAT REGARDLESS LEADS TO BELOW NORMAL TEMPERATURES BEYOND TODAY. THIS MORNING THE UPPER RIDGE BUILDS EAST BY NOONTIME CDT. SOUTH WINDS WILL DRAW MOISTURE AND WARMER AIR NORTH AS THE DRYLINE SETS UP ON THE HIGH PLAINS. BY LATE AFTERNOON THE H25 JETSTREAM AXIS CROSSES THE 4 CORNERS REGION THAT WILL LEAD TO LEE CYCLOGENESIS NEAR THE TRI STATE AREA. SURFACE HEATING WILL HELP IN THE DESTABILIZATION PROCESS FURTHER SOUTHWEST WITH STORMS TO LIFT NORTHWARD AS THE SURFACE LOW MOVES EAST THEN NORTHEAST. THE LOW LEVEL JET STRENGTHENS AT 40 TO 60 KNOTS WHERE THE GREATEST INSTABILITY ACROSS THE SOUTHWEST WILL SEE INITIAL STORM DEVELOPMENT THEN AS THE SYSTEM LIFTS NORTHEAST OVERNIGHT THE CHANCE FOR THUNDERSTORMS NORTH AND EAST. THE GREATEST THREAT IS LARGE HAIL. BY MIDNIGHT THE SEVERE THREAT ENDS BUT CONCERN HITS AS THE TROWEL DEVELOPS WITH INCREASED LIFT ACROSS THE FAR NORTHWEST FROM 09Z TO 15Z THURSDAY. BUFKIT SOUNDING SHOWS POTENTIAL FOR ALL PRECIPITATION IN SHERIDAN...NORTHERN GARDEN AND POSSIBLY NORTHWEST CHERRY COUNTY AS SNOW AS GOOD DIVERGENCE ALOFT MAY VARY WELL COOL THE AIR COLUMN TO TRANSITION THE RAIN TO ALL SNOW. FOR NOW A MIXTURE OF RAIN AND SNOW IS INCLUDED BUT WILL NEED TO BE RE/EVALUATED TODAY FOR IMPACTS. THE GROUND TEMPERATURE IS TOO WARM FOR ACCUMULATIONS SO LIMITED IMPACT FOR NOW SEEN. THE NAM IS MUCH MORE PROGRESSIVE IN BRINGING DRIER AIR INTO THE SYSTEM WHERE SOME CLEARING MAY BE SEEN AS THE COLD FRONT PUSHES EAST AFTER MIDNIGHT. HIGHEST POPS MAINTAINED ACROSS THE NORTH WERE BETTER FORCING AND INCREASING ISENTROPIC LIFT OCCURS. THURSDAY INTO FRIDAY THE SYSTEM WILL CONTINUE TO LIFT NORTHEAST. PROBLEM AREA WILL BE THE WINDS AND HOW STRONG THEY WILL BE. WEST OF HIGHWAY 83 A HIGH WIND WATCH WILL BE ISSUED FROM 15Z TO 03Z THAT EVENING WHERE WINDS MAY LIKELY REACH 30 TO 40 KNOTS THEN AREAS EAST A WIND ADVISORY WILL ALSO BE NEEDED. THE SYSTEM OCCLUDES DURING THIS PERIOD WHERE THE CHANCE FOR SHOWERS CONTINUES MAINLY ACROSS THE NORTH UNTIL FRIDAY AS THE UPPER LOW MOVES SOUTHEAST SLOWLY FOR LINGERING CLOUDS AND CHANCE FOR SHOWERS TO DECREASE FROM THE NORTHWEST TO SOUTHEAST. SATURDAY THROUGH SUNDAY WE GET A BREAK BEFORE THE NEXT SYSTEM DROPS THROUGH THE NORTHWEST AND TO THE PLAINS MONDAY MORNING. MODELS ARE IN AGREEMENT WITH THE FRONT TO PUSH SOUTHEAST MONDAY WITH FEW CHANGES MADE. && .AVIATION... VFR CONDITIONS THROUGH 22Z-23Z. ISOLATED TO SCATTERED CONVECTIVE ACTIVITY SHOULD COMMENCE ACROSS THE WRN HIGH PLAINS...ALONG AND WEST OF HIGHWAY 61 BETWEEN 00Z AND 03Z. SIMILAR ACTIVITY MAY DEVELOP ELSEWHERE ACROSS SWRN NEB AROUND 00Z. THE STORMS WHICH COULD BE SEVERE WILL LIFT RAPIDLY NORTHEAST AT 30 TO 40 MPH. WITH THE PASSAGE OF A PACIFIC COLD FRONT THIS EVENING...CURRENTLY NEAR THE UT-CO ID-WY BORDERS...STRATUS SHOULD DEVELOP ACROSS WRN NEB AROUND 03Z. THE FRONT AND CIGS NEAR OVC015 WILL PROGRESS SLOWLY EASTWARD OVERNIGHT. THUS VFR CONDITIONS AFTER 00Z TONIGHT ARE EXPECTED TO DETERIORATE TO AREAS OF MVFR AND LOCALLY IFR IN THUNDERSTORMS WHICH COULD CONTINUE AFTER 06Z TONIGHT. && .LBF WATCHES/WARNINGS/ADVISORIES...HIGH WIND WATCH FROM THURSDAY MORNING THROUGH THURSDAY EVENING FOR NEZ004-005-022>025-035>037-056>059-069>071-094. && SHORT TERM/EXTENDED...KECK AVIATION...CDC
Hazardous weather outlook, Sep 29, 2:59 PM MDT, 11 hours 36 minutes before
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</html>The office that day
Everything else NWS North Platte, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 30, 2:57 PM MDT | Wind Advisory | LBF | Arthur, Blaine, Boyd, Brown, Chase, Cherry and 20 more | 49 hr |
Nearby
High Wind Watches in Nebraska, 2009Every high wind watch 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.