Alert archive / Nebraska / Severe Thunderstorm Warnings in 2002
Severe Thunderstorm Warning 187, NWS Omaha, NE
NWS Omaha, NE issued this severe thunderstorm warning at Jul 10, 2002, 1:50 AM CDT for Cedar County, Knox County, Nebraska. It was in force for 40 min. 2 reports 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
- Jul 10, 2002, 1:50 AM CDT (06:50 UTC)
- Expired
- Jul 10, 2002, 2:30 AM CDT
- In force
- 40 min
- Issued by
- NWS Omaha, NE
- Area
- Counties, with a storm outline in the text
Counties Cedar County, NE, Knox County, NE
The radar
The Sioux Falls radar (KFSD), 128 km from the middle of the area, began a volume at 06:49 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 10, 2:10 AM CDT | Hail 0.75 | Crofton, NE | |
| Jul 10, 2:20 AM CDT | Hail 0.75 | Fordyce, NE |
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
Omaha, NE (KOAX), launched 00:00Z, 6.8 hours before the alert went out and 175 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
- 2865 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 1846 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 3.4
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 Jul 9, 3:35 PM CDT, 10 hours 15 minutes earlier.
Area forecast discussion, Jul 9, 3:35 PM CDT, 10 hours 15 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE OMAHA/VALLEY NE 335 PM CDT TUE JUL 9 2002 ...MAIN FORECAST CONCERNS ARE CHANCE OF THUNDERSTORMS ON TONIGHT INTO THURSDAY...AND TEMPERATURES... CURRENTLY...OUTFLOW BOUNDARY FROM TSTM CLUSTER WHICH MOVED INTO WRN IA EARLY THIS AFTN HAS PUSHED TO NEAR A YORK...BIE...FNB LINE AND CONTINUES TO SPREAD SWD. THIS HAS GIVEN A LITTLE MORE PUSH TO AN OLD FRONTAL BOUNDARY. CONVECTION HAS DEVELOPED ALONG THIS BOUNDARY EAST OF BIE. SHORT TERM...BOUNDARY MAY CONTINUE TO FIRE AND MOVE SOUTH. EXPECT WRN PORTION OF FRONT IN CNTRL NEB TO BECOME ACTIVE THIS EVE OR EARLY TONIGHT IN ADVANCE OF STRONG UPPER WAVE PLUNGING SEWD INTO DKTS. LOW TEMPS STILL FAIRLY WARM DUE TO HIGH SFC DEW POINTS. ON WED TSTMS ARE LIKELY TO MOVE BENERALLY EWD WITH INVERTED TROF. PRECIP COMPLEX WILL PROB LAST WELL INTO THE DAY BEFORE MOVING EWD INTO IOWA...MAKING IT TOUGH TO FORECAST HIGH TEMPS. THERE IS A LESSER CHC FOR MORE TSTMS WED NIGHT INTO EARLY THU AS ANOTHER VORT LOBE COMES AROUND BACKSIDE OF UPPER LOW. MAX TEMPS WILL STILL BE SUPPRESSED BY CLOUD COVER...BUT PERHAPS NOT AS MUCH AS VERY COOL GUID. EXPECT DRY WX TO LAST FROM THUR AFTN THROUGH NEXT TUE AS UPPER LOW EXITS TO OUR EAST AND HEIGHTS BUILD ALOFT. MEANWHILE...INITIALLY COOL SFC HIGH GRADUALLY WARMS UP...GENERALLY IN LINE WITH HPC GUIDANCE. DIURNAL RANGE SHOULD BE ENHANCED BY GENERALLY DRY GROUND. .OMA...NONE. POLLACK
The office that day
Everything else NWS Omaha, NE issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 10, 2:30 AM CDT | Severe Thunderstorm Warning | OAX | Cedar | 45 min |
| Jul 10, 5:51 AM CDT | Severe Thunderstorm Warning | OAX | Monona | 54 min |
Nearby
Severe Thunderstorm Warnings in Nebraska, 2002Every severe thunderstorm warning in 2002
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; radar from the NEXRAD Level II archive.