Alert archive / Oklahoma / Red Flag Warnings in 2021

Red Flag Warning 4, NWS Norman, OK

April 2, 20218 counties in Oklahoma

NWS Norman, OK issued this red flag warning at Apr 2, 2021, 2:17 AM CDT for 8 counties in Oklahoma. It took effect at Apr 2, 2021, 12:00 PM CDT. It was in force for 8 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
Apr 2, 2021, 2:17 AM CDT (07:17 UTC)
In effect from
Apr 2, 2021, 12:00 PM CDT
Expired
Apr 2, 2021, 8:00 PM CDT
In force
8 hr
Issued by
NWS Norman, OK

Counties Alfalfa County, OK, Dewey County, OK, Ellis County, OK, Harper County, OK, Major County, OK, Roger Mills County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 100 km from the middle of the area, began a volume at 07:20 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

Dodge City, (KDDC), launched 00:00Z, 7.3 hours before the alert went out and 170 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, Dodge City, at 00:00Z on 2021-04-02Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Dodge City, at 00:00Z on 2021-04-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 29 square meters per square second.19395878Sfc1 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
3089 m above ground
0-6 km bulk shear
53 kt
0-1 km storm-relative helicity
29 m²/s²
0-3 km storm-relative helicity
300 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

572 
WWUS84 KOUN 020717
RFWOUN

URGENT - FIRE WEATHER MESSAGE
National Weather Service Norman OK
217 AM CDT Fri Apr 2 2021


OKZ004>006-009>011-014-015-022200-
/O.UPG.KOUN.FW.A.0003.210402T1700Z-210403T0100Z/
/O.NEW.KOUN.FW.W.0004.210402T1700Z-210403T0100Z/
Harper-Woods-Alfalfa-Ellis-Woodward-Major-Roger Mills-Dewey-
217 AM CDT Fri Apr 2 2021

...RED FLAG WARNING IN EFFECT FROM NOON TO 8 PM CDT THIS EVENING 
FOR gusty south winds and low relative humidity FOR northwest
Oklahoma...

The National Weather Service in Norman has issued a Red Flag
Warning for windy and dry conditions, which is in effect from 
noon today to 8 PM CDT this evening. 

* TIMING...Noon through 8 PM.

* WINDS...South 20 to 30 mph with gusts up to 40 mph.

* RELATIVE HUMIDITY...As low as 24 percent.

* TEMPERATURES...Up to 70.

* IMPACTS...Any fires that start in this environment will be 
  very difficult to control.

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
contribute to extreme fire behavior.

&&

$$

Nearby

Red Flag Warnings in Oklahoma, 2021Every red flag warning in 2021

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.