Alert archive / Nebraska / Red Flag Warnings in 2012

Red Flag Warning 52, NWS North Platte, NE

November 21, 20127 counties in Nebraska

NWS North Platte, NE issued this red flag warning at Nov 21, 2012, 12:40 PM MST for 7 counties in Nebraska. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Nov 21, 2012, 12:40 PM MST (19:40 UTC)
Expired
Nov 21, 2012, 7:00 PM MST
In force
6 hr
Issued by
NWS North Platte, NE

Counties Arthur County, NE, Cherry County, NE, Deuel County, NE, Garden County, NE, Grant County, NE, Keith County, NE, Sheridan County, NE

The radar

The North Platte radar (KLNX), 111 km from the middle of the area, began a volume at 19:44 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, 7.7 hours before the alert went out and 130 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 2012-11-21Temperature 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 2012-11-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 63 square meters per square second.193958Sfc1 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
3143 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
63 m²/s²
0-3 km storm-relative helicity
24 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.

565 
WWUS83 KLBF 211940
RFWLBF

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE NORTH PLATTE NE
140 PM CST WED NOV 21 2012

...RED FLAG WARNING FOR LOW RELATIVE HUMIDITY AND GUSTY WINDS...

.LOW PRESSURE DEEPENING ACROSS THE NORTHERN PLAINS HAS INCREASED
WINDS ACROSS THE EASTERN PANHANDLE THIS AFTERNOON. IN
ADDITION...VERY DRY AIR IS IN PLACE ACROSS THE REGION LEADING TO
CRITICALLY LOW RELATIVE HUMIDITY VALUES.

NEZ204-220200-
/O.NEW.KLBF.FW.W.0052.121121T1940Z-121122T0200Z/
EASTERN PANHANDLE/CRESCENT LAKE NWR-
1240 PM MST WED NOV 21 2012

...RED FLAG WARNING IN EFFECT UNTIL 7 PM MST THIS EVENING FOR
WIND AND LOW RELATIVE HUMIDITY FOR THE EASTERN PANHANDLE 
INCLUDING CRESCENT LAKE WILDLIFE REFUGE...

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A RED
FLAG WARNING FOR WIND AND LOW RELATIVE HUMIDITY...WHICH IS IN
EFFECT UNTIL 7 PM MST THIS EVENING.

* AFFECTED AREA...IN NEBRASKA...FIRE WEATHER ZONE 204 EASTERN 
  PANHANDLE/CRESCENT LAKE NWR.

* WINDS...SOUTHWEST 10 TO 20 MPH WITH GUSTS UP TO 25 MPH.

* RELATIVE HUMIDITY...AS LOW AS 10 PERCENT.

* IMPACTS...DANGEROUS FIRE GROWTH POTENTIAL.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A RED FLAG WARNING MEANS THAT CRITICAL FIRE WEATHER CONDITIONS
ARE EITHER OCCURRING NOW...OR WILL SHORTLY. A COMBINATION OF
STRONG WINDS...LOW RELATIVE HUMIDITY...AND WARM TEMPERATURES WILL
CREATE EXPLOSIVE FIRE GROWTH POTENTIAL.

&&

$$

HTTP://WEATHER.GOV/LBF
2 follow-up statements
692 
WWUS83 KLBF 220135
RFWLBF

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE NORTH PLATTE NE
735 PM CST WED NOV 21 2012

...RED FLAG WARNING WILL EXPIRE AT 7 PM MST THIS EVENING...

NEZ204-220245-
/O.EXP.KLBF.FW.W.0052.000000T0000Z-121122T0200Z/
EASTERN PANHANDLE/CRESCENT LAKE NWR-
635 PM MST WED NOV 21 2012

...RED FLAG WARNING WILL EXPIRE AT 7 PM MST THIS EVENING...

WINDS HAVE DIMINISHED AND RELATIVE HUMIDITY IS INCREASING...SO
THE RED FLAG WARNING WILL BE ALLOWED TO EXPIRE AT 7 PM MDT.  

$$

TAYLOR

HTTP://WEATHER.GOV/LBF
161 
WWUS83 KLBF 220141
RFWLBF

URGENT - FIRE WEATHER MESSAGE
NATIONAL WEATHER SERVICE NORTH PLATTE NE
741 PM CST WED NOV 21 2012

...RED FLAG WARNING WILL EXPIRE AT 7 PM MST THIS EVENING ...

NEZ204-220245-
/O.EXP.KLBF.FW.W.0052.000000T0000Z-121122T0200Z/
EASTERN PANHANDLE/CRESCENT LAKE NWR-
641 PM MST WED NOV 21 2012

...RED FLAG WARNING WILL EXPIRE AT 7 PM MST THIS EVENING 
FOR FIRE WEATHER ZONE 204...  

WINDS HAVE DIMINISHED AND RELATIVE HUMIDITY HAS INCREASED...SO 
THE RED FLAG WARNING WILL BE ALLOWED TO EXPIRE.  

$$

HTTP://WEATHER.GOV/LBF

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 21, 2:38 PM MSTWind AdvisoryLBFArthur, Blaine, Boyd, Brown, Chase, Cherry and 20 more30 hr

Nearby

Red Flag Warnings in Nebraska, 2012Every red flag warning in 2012

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.