Alert archive / Nebraska / Severe Thunderstorm Warnings in 2001
Severe Thunderstorm Warning 425, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Sep 16, 2001, 5:50 PM CDT for Pawnee County, Nebraska. It was in force for 25 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
- Sep 16, 2001, 5:50 PM CDT (22:50 UTC)
- Expired
- Sep 16, 2001, 6:15 PM CDT
- In force
- 25 min
- Issued by
- NWS Omaha, NE
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
County Pawnee County, NE
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 16, 6:25 PM CDT | Thunderstorm Wind 55 E | Pawnee City, NE | Thunderstorm wind gusts estimated at over 60 mph blew over a tree which briefly closed a county road southwest of Pawnee City. |
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 nearest sounding before it
Topeka, KS (KTOP), launched 12:00Z, 10.8 hours before the alert went out and 136 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
- 3 J/kg
- Mixed-layer CIN
- -159 J/kg
- Mixed-layer LCL
- 745 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 65 m²/s²
- 0-3 km storm-relative helicity
- 70 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 Omaha, NE wrote its last area forecast discussion before this severe thunderstorm warning went out at Sep 16, 2:35 PM CDT, 3 hours 15 minutes earlier.
Area forecast discussion, Sep 16, 2:35 PM CDT, 3 hours 15 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 235 PM CDT SUN SEP 16 2001 UNSETTLED TIME IN STORE WITH PERIODS OF PRECIPIATION TNGT AND THEN AGAIN ESPECIALLY MON NIGHT INTO TUE AND TUE NIGHT BEFORE PATTERN TRENDS TOWARD DRIER. FOR TNGT SHORTWAVE PIVOTING THROUGH BASE OF UPPER TROF EXTENDING FROM UPPER LOW OVER ERN SD APPEARS TO BE GENERATING LIFT FOR AREAS OF SHOWERS AND EMBEDDED TSTMS ACROSS AREA THIS AFTN. ALTHOUGH MODELS LINGER SOME CHC FOR SHOWERS THROUGH TNGT DUE TO INCREASEING LOWER LEVEL WAA...APPEARS MAIN POTENTIAL FOR SHOWERS AND EMBEDDED TSTSMS WILL BE THROUGH 06Z ASSOCIATED WITH SHORTWAVE. THIS APPEARS FAIRLY WELL DEPICTED BY 12Z AVN 700/500 MB Q VECTORS AND 700MB OMEGA FIELDS. ON MONDAY APPEARS CHC FOR RAIN WILL BE RELATIVELY LOW WITH MAIN RISK SRN ZONES. AREA SHOULD BE BETWEEN SHORTWAVES WITH WEAK LOW LEVEL CAA OVERSPREADING AREA AS WEAK SFC BNDRY PUSHES S TOWARD NERN KS AND NRN MO. AGAIN FEEL AVN HAS A DECENT HANDLE ON THIS AND WILL LIKELY UNDERCUT FWC POPS. MAX TEMPS A CHALLENGE ON WILL DEPENDENT CLOUDINESS. AT THIS CONJUNCTURE WILL LEAN TOWARD COOLER MAV. ALTHOUGH MODELS BEGIN TO EXHIBIT DIFFERENCES INCREASED BY APPARENT DEVELOPING FEEDBACK PROBLEMS IN THE ETA AND AVN...THEY ALL POINT TO INCREASED LIKELIHOOD FOR RAIN AND TSTMS STARTING MON NIGHT AND CONTINUING INTO TUE NIGHT AS SIGNIFICANT SHORTWAVE TROF MOVES INTO CENTRAL PLAINS. PRECIPIATION MECHANISIM ALSO ENHANCED BY INDICATED STRONG LOW LEVEL POSITIVE THETA E ADVECTION UP ACROSS ERN KS AND WRN MO INTO LOW LEVEL BNDRY VCNTY SRN NEB NRN KS BORDER INTO NRN MO. BELIEVE SERN NEB AND SW IA WILL BE MOST IMPACTED BY THIS SCENARIO WITH THE HIGHEST LIKELIHOOD FOR EMBEDDED TSTMS. IF ANY PRECIP LINGERS WED IT SHOULD BE MAINLY IN MRNG HOURS. EXTENDED PERIODS SHAPING UP MAINLY DRY TO START BUT GET SOMEWHAT MORE UNSETTLED WITH CHC OF SHOWERS AGAIN NEXT WEEKEND. .OMA...NONE. WIESE
In the hours before
Special weather statement, Sep 16, 11:55 AM CDT, 5 hours 55 minutes before
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</html>Special weather statement, Sep 16, 5:05 PM CDT, 45 minutes before
IAZ043-055-056-069-079-080-090-091-NEZ011-012-015>018-030>034- 042>045-050>053-065>068-078-088>093-170300- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 505 PM CDT SUN SEP 16 2001 STORM SPOTTER ACTIVATION IS NOT ANTICIPATED THIS AFTERNOON OR TONIGHT IN EASTERN NEBRASKA AND SOUTHWEST IOWA. AN UPPER LEVEL DISTURBANCE WILL CONTINUE TO MOVE ACROSS THE CENTRAL PLAINS TONIGHT. THE ATMOSPHERE OVER EASTERN NEBRASKA AND SOUTHWEST IOWA IS MOIST AND SOMEWHAT UNSTABLE IN MID LEVELS...BUT RELATIVELY COOL AND STABLE NEAR THE GROUND. SCATTERED THUNDERSTORMS WILL MOVE ACROSS SOUTHEAST NEBRASKA AND SOUTHWEST IOWA THROUGH THIS EVENING AND PRODUCE HEAVY RAIN AND SMALL HAIL AT TIMES...HOWEVER NO SEVERE WEATHER IS EXPECTED. FOBERT
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 16, 6:15 PM CDT | Severe Thunderstorm Warning | OAX | Pawnee | 30 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 2001Every severe thunderstorm warning in 2001
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.