Alert archive / Illinois / Red Flag Warnings in 2010
Red Flag Warning 2, NWS St. Louis, MO
NWS St. Louis, MO issued this red flag warning at Apr 15, 2010, 4:48 AM CDT for 4 counties in Illinois. It took effect at Apr 15, 2010, 12:00 PM CDT. 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
- Apr 15, 2010, 4:48 AM CDT (09:48 UTC)
- In effect from
- Apr 15, 2010, 12:00 PM CDT
- Expired
- Apr 15, 2010, 6:00 PM CDT
- In force
- 6 hr
- Issued by
- NWS St. Louis, MO
Counties Greene County, IL, Jersey County, IL, Macoupin County, IL, Montgomery County, IL
The radar
The St Louis radar (KLSX), 82 km from the middle of the area, began a volume at 09:51 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
Lincoln, IL (KILX), launched 00:00Z, 9.8 hours before the alert went out and 160 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 3446 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 12 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
671 WWUS83 KLSX 150948 RFWLSX URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE ST LOUIS MO 448 AM CDT THU APR 15 2010 ...HIGH FIRE DANGER THIS AFTERNOON... .A WARM AND DRY SOUTHWEST WIND WILL PREVAIL OVER THE REGION TODAY. EXPECT TEMPERATURES TO REMAIN WELL ABOVE NORMAL TODAY. WHILE RELATIVE HUMIDITY READINGS WILL START OUT RATHER HIGH...IT IS LIKELY THE HUMIDITY WILL FALL RAPIDLY THIS AFTERNOON DURING THE PEAK HEATING HOURS. THE LOW RELATIVE HUMIDITY COMBINED WITH DRY FUELS AND A SUSTAINED WIND OF 15 TO 2O MPH WILL PRODUCE CONDITIONS WHERE FIRES COULD SPREAD QUICKLY OUT OF CONTROL. ILZ058>060-099-152300- /O.NEW.KLSX.FW.W.0002.100415T1700Z-100415T2300Z/ GREENE IL-MACOUPIN IL-MONTGOMERY IL-JERSEY IL- 448 AM CDT THU APR 15 2010 ...RED FLAG WARNING IN EFFECT FROM NOON TODAY TO 6 PM CDT THIS EVENING... THE NATIONAL WEATHER SERVICE IN ST LOUIS HAS ISSUED A RED FLAG WARNING...WHICH IS IN EFFECT FROM NOON TODAY TO 6 PM CDT THIS EVENING. RELATIVE HUMIDITY VALUES ARE EXPECTED TO DROP BELOW 25 PERCENT THIS AFTERNOON. THIS LOW HUMIDITY COMBINED WITH DRY FUELS AND A SUSTAINED WIND OF 15 TO 25 MPH WILL PRODUCE AN ENHANCED FIRE DANGER THIS AFTERNOON. 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. && $$ CARNEY
1 follow-up statement
456 WWUS83 KLSX 152254 RFWLSX URGENT - FIRE WEATHER MESSAGE NATIONAL WEATHER SERVICE ST LOUIS MO 554 PM CDT THU APR 15 2010 ILZ058>060-099-160000- /O.EXP.KLSX.FW.W.0002.000000T0000Z-100415T2300Z/ GREENE IL-MACOUPIN IL-MONTGOMERY IL-JERSEY IL- 554 PM CDT THU APR 15 2010 ...RED FLAG WARNING WILL EXPIRE AT 6 PM CDT THIS EVENING... THE RED FLAG WARNING WILL EXPIRE AT 6 PM CDT THIS EVENING. THE COMBINATION OF COOLING TEMPERATURES...RISING RELATIVE HUMIDITY VALUES...AND DIMINISHING GUSTY WINDS WILL LEAD TO A DECREASE IN THE FIRE DANGER TONIGHT. THEREFORE...THE RED FLAG WARNING WILL BE ALLOWED TO EXPIRE. $$ KANOFSKY
Nearby
Red Flag Warnings in Illinois, 2010Every red flag warning in 2010
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.