Alert archive / Nebraska / Flash Flood Watches in 2007

Flash Flood Watch 10, NWS North Platte, NE

July 28, 20074 counties in Nebraska

NWS North Platte, NE issued this flash flood watch at Jul 28, 2007, 12:10 PM MDT for 4 counties in Nebraska. It took effect at Jul 28, 2007, 6:00 PM MDT. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jul 28, 2007, 12:10 PM MDT (18:10 UTC)
In effect from
Jul 28, 2007, 6:00 PM MDT
Expired
Jul 28, 2007, 8:42 PM MDT
In force
3 hr
Issued by
NWS North Platte, NE

Counties Chase County, NE, Frontier County, NE, Hayes County, NE, Perkins County, NE

The radar

The Goodland radar (KGLD), 144 km from the middle of the area, began a volume at 18:13 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 12:00Z, 6.2 hours before the alert went out and 191 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.

Skew-T log-pSkew-T log-p diagram, Denver, CO at 12:00Z on 2007-07-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 27 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 12:00Z on 2007-07-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 18 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
27 J/kg
Mixed-layer CIN
-160 J/kg
Mixed-layer LCL
939 m above ground
0-6 km bulk shear
8 kt
0-1 km storm-relative helicity
18 m²/s²
0-3 km storm-relative helicity
38 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood watch went out at Jul 28, 1:43 AM MDT, 10 hours 27 minutes earlier.

Area forecast discussion, Jul 28, 1:43 AM MDT, 10 hours 27 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NORTH PLATTE NE
243 AM CDT SAT JUL 28 2007

.DISCUSSION...
ONGOING CONVECTION ENTERING SOUTHWEST NEBRASKA WILL BE THE PRIMARY
FOCUS TODAY AND TONIGHT AS IT DEVELOPS NORTHEAST. MODELS ARE IN
AGREEMENT WITH HEAVY RAINFALL TO DEVELOP INTO PORTIONS OF WESTERN
NEBRASKA TODAY BUT DIFFER IN PLACEMENT. GFS SOLUTION IS CLOSER TO
ONGOING CONVECTION WITH FORECAST TRENDED IN THIS DIRECTION BUT
MAINTAINING A FURTHER DISPLACEMENT SOUTH OF HIGHER QPF FORECAST
AMOUNTS. WEAK WIND FLOW ALOFT MAINTAINING A SLOW TRANSITION OF
CONVECTION EASTWARD WITH WARM FRONT THAN EXTENDS FROM
SOUTHWEST NEBRASKA ACROSS CENTRAL KANSAS AT 07Z TO LIFT NORTHEAST
INTO SOUTHWEST NEBRASKA THROUGH 09Z. HIGHEST RADAR REFLECTIVITY IS
ON THE LEADING EDGE OF CONVECTION WERE H85 WINDS ARE FROM THE EAST
AT 15 KNOTS PER RED WILLOW PROFILER...AND MORE EASTERLY THAN
ADVERTISED IN THE MODEL. TODAY WAVE DROPS SOUTHEAST AND WILL
ENHANCE LIFT FOR STORM DEVELOP OVER THE SOUTHERN SANDHILLS INTO
SOUTHWEST NEBRASKA. FLOOD WATCH REMAINS IN EFFECT THROUGH 21Z THIS
AFTERNOON WITH INCREASING RIDGING FROM THE WEST TO LIMIT HEAVY
RAINFALL THREAT BEYOND THIS AFTERNOON. IF THE HEAVY RAIN THREAT
SHIFTS FURTHER NORTH THE FLOOD WATCH MAY NEED TO BE SHIFTED NORTH.
GFS DOES CARRY H250 JETSTREAM AXIS NORTH WITH RIGHT REAR QUADRANT
TO ENHANCE LIFT TO MAINTAIN CONVECTION INTO TONIGHT. TEMPERATURES
TODAY WILL BE IMPACTED BY THE CONVECTION AND CLOUD COVERAGE WITH
READINGS COOLED A FEW DEGREES ACROSS THE WEST.

TONIGHT INTO SUNDAY THE UPPER RIDGE AXIS BUILDS EASTWARD WITH
SEVERAL EMBEDDED WAVES TO DROP SOUTHEAST. THE SURFACE FRONT WILL
PUSH SOUTH WITH CONVECTION TO LINGER ACROSS THE SOUTHWEST BUT
DECREASE IN AREAL COVERAGE. HOWEVER MOISTURE BEING DRAWN NORTH ON
THE PLAINS WILL KEEP CONSIDERABLE CLOUDINESS IN THE FORECAST WITH
A CHANCE FOR EARLY MORNING STRATUS AND FOG SUNDAY AND MONDAY
MORNING. MONDAY THE MODEL CLOSES AN UPPER LOW OFF OVER NEBRASKA
WITH THE POTENTIAL FOR SHOWERS AND THUNDERSTORMS THROUGH MIDWEEK.
THE QPF FORECASTED WILL LIKELY LIMIT FULL HEATING THROUGH MIDWEEK
WITH HIGHS LOWERED A FEW DEGREES.

&&

.AVIATION...
MIXED VFR AND IFR CONDITIONS ARE EXPECTED ACROSS BOTH THE 274 AND
264 TWB ROUTES AND THE WRN FLANK OF 098 TODAY AND TONIGHT. A WARM
FRONT ACROSS NWRN KS WILL LIFT VERY SLOWLY NORTH TODAY WITH
SCATTERED TO NUMEROUS SHRA/TSTM ACTIVITY CONTINUING. THERE IS A
LIMITED POSSIBILITY THE CONVECTION ACROSS NERN COLO AND WRN/SWRN NEB
COULD DISSIPATE LATE THIS MORNING AND REDEVELOP LATE THIS AFTN OR
THIS EVENING PRODUCING A NARROW WINDOW OF VFR CONDITIONS DURING THE
AFTERNOON. THIS IS SPECULATIVE. THUS THE GENERAL FCST IS FOR MIXED
IFR AND MVFR CONDITIONS FOR MOST OF THE NEXT 24 HRS.

&&

.LBF WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH THROUGH THIS AFTERNOON FOR NEZ022-056>059-
069>071.

&&

TLK/CDC
Hazardous weather outlook, Jul 28, 4:32 AM MDT, 7 hours 38 minutes before
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The office that day

Everything else NWS North Platte, NE issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 28, 2:40 AM MDTFlash Flood WarningLBFHayes3 hr
Jul 28, 4:12 AM MDTFlash Flood WarningLBFFrontier3 hr

Nearby

Flash Flood Watches in Nebraska, 2007Every flash flood watch in 2007

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.