Alert archive / Wyoming / Flash Flood Warnings in 2007

Flash Flood Warning 4, NWS Cheyenne, WY

July 1, 2007Laramie County, Wyoming; Banner County, Nebraska

NWS Cheyenne, WY issued this flash flood warning at Jul 1, 2007, 5:07 PM MDT for Laramie County, Wyoming; Banner County, Nebraska. It took effect at Jul 1, 2007, 5:12 PM MDT. It was in force for 108 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
Jul 1, 2007, 5:07 PM MDT (23:07 UTC)
In effect from
Jul 1, 2007, 5:12 PM MDT
Expired
Jul 1, 2007, 7:00 PM MDT
In force
108 min
Issued by
NWS Cheyenne, WY
Area
Whole counties

Counties Banner County, NE, Laramie County, WY

The radar

The Cheyenne radar (KCYS), 59 km from the middle of the area, began a volume at 23:08 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, 11.1 hours before the alert went out and 303 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, N. Platte/Lee Bi, NE at 12:00Z on 2007-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, N. Platte/Lee Bi, NE at 12:00Z on 2007-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -32 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
822 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
-32 m²/s²
0-3 km storm-relative helicity
14 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS55 KCYS 012312
FFWCYS
NEC007-WYC021-020100-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
507 PM MDT SUN JUL 1 2007

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN BANNER COUNTY IN THE PANHANDLE OF NEBRASKA...
  EXTREME NORTHEASTERN LARAMIE COUNTY IN SOUTHEAST WYOMING...

* UNTIL 700 PM MDT

* AT 503 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA.

* THE STORM PRODUCING FLASH FLOODING WILL OTHERWISE REMAIN OVER
  MAINLY RURAL AREAS OF THE INDICATED COUNTIES.

ADDITIONAL RAINFALL AMOUNTS OF ONE TO TWO INCHES PER HOUR ARE POSSIBLE 
IN THE WARNED AREA.

DOPPLER RADAR INDICATED THAT ONE TO TWO INCHES OF RAIN HAS ALREADY 
FALLEN IN A LOCATION 2 TO 7 MILES NORTHEAST OF ALBIN. HEAVY RAIN 
WILL FALL ACROSS THIS AREA THROUGH AT LEAST 600 PM MDT. STORMS ARE 
MOVING EAST AT ONLY 5 MPH.

SOME ROADS INCLUDED IN THE FLASH FLOOD WARNING ARE...

ALBIN-LA GRANGE ROAD
HOLGERSON ROAD
ROAD 231

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

REPORT FLOODING TO THE NATIONAL WEATHER SERVICE OFFICE IN CHEYENNE AT
1-800-269-6220.

LAT...LON 4140 10413 4140 10385 4157 10385 4152 10412

$$

RUBIN
1 follow-up statement
000
WGUS75 KCYS 020021
FFSCYS

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
618 PM MDT SUN JUL 1 2007

NEC007-WYC021-020100-
BANNER NE-LARAMIE WY-
618 PM MDT SUN JUL 1 2007

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 700 PM MDT FOR
EXTREME NORTHEASTERN LARAMIE AND SOUTHWESTERN BANNER COUNTIES...

AT 615 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE ONLY LIGHT SHOWERS IN THE FLASH FLOOD WARNING AREA.

DOPPLER RADAR ESTIMATES THAT 1.5 TO 2.5 INCHES OF RAIN HAD FALLEN IN 
AN AREA 1 TO 7 MILES NORTHEAST OF ALBIN.

SOME ROADS THAT MAY BE FLOODED INCLUDE...

HOLGERSON ROAD
ALBIN-LA GRANGE ROAD NORTH OF ALBIN
ROADS IN SOUTHWEST BANNER COUNTY

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1100 PM MDT
SUNDAY EVENING FOR CENTRAL NEBRASKA.

LAT...LON 4140 10413 4140 10385 4157 10385 4152 10412

$$

RUBIN

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 1, 3:59 PM MDTSevere Thunderstorm WarningCYSLaramie46 min
Jul 1, 4:31 PM MDTFlash Flood WarningCYSLaramie119 min
Jul 1, 4:38 PM MDTSevere Thunderstorm WarningCYSLaramie67 min

Nearby

Flash Flood Warnings in Wyoming, 2007Flash Flood Warnings in Nebraska, 2007Every flash flood warning 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.