5140

Page 1 of 4

FOREST SERVICE MANUAL

RUSSELLVILLE, AR

5100 - FIRE MANAGEMENT

OZARK SUPPLEMENT 5100-92-4

Effective July 13, 1992

POSTING NOTICE. SUPPLEMENTS to this MANUAL are numbered consecutively. Check the last transmittal received for this manual to see that the above supplement number is in sequence. If not, order intervening supplements at once on form FS-1100-6. Do not post this supplement until the missing one(s) is received and posted. After posting retain this transmittal until the next supplement to this manual is received. Place it at the front of the manual behind the title page.

Superseded New

Page Code (Number of Sheets)

 

5151.03--1 2 0

5140 0 4

Digest:

Moves information from chapter 50 to chapter 40. Minor changes to text. Remove existing supplements from chapter 50 and place this document at the end of chapter 40.

 

 

 

 

LYNN C. NEFF

Forest Supervisor


 

FSM 5100 - FIRE MANAGEMENT

OZARK SUPPLEMENT 5100-92-4

EFFECTIVE 07/13/92

5140 - PRESCRIBED FIRE

5140 - PRESCRIBED FIRE

5140.3 - Policy. All prescribed burns shall have a Prescribed Burning Plan, which has been approved prior to ignition. The approving Line Officer shall be the District Ranger. All Prescribed Burning Plan changes must be approved and initialed on the Plan by the approving Line Officer.

All prescribed burns shall be conducted under burning parameters that will allow all Land Management objectives to be met.

The Standard Prescribed Burning Plan form is R8-FS-5100-6 with all applicable items completed. A prescribed burning unit map shall be attached to each plan showing lines to be constructed, areas to be protected, private land, smoke dispersement and all other features and situations significant to the burning operation.

Regional Instructions and Ozark-St. Francis Instructions and Guidelines for Prescribed Fire Plan shall be used for completing form R8-FS-5100-6.

All prescribed burns shall be conducted under the supervision of a qualified Burning Boss. A copy of the approved Prescribed Burning Plan and map shall be in possession of the burning boss at the burn site.

The Burning Boss in charge of the prescribed burn will certify, by signing the Prescribed Burning Plan, that the required ranges of current and forecasted weather and other necessary factors are met prior to ignition.

When the prescribed burn has been accomplished, evaluations completed and prescription updated, the approving Line Officer shall close the plan with signature and date.

The Supervisor's Office, Fire Management shall assist Districts as needed and make spot checks of prescribed burns and Prescribed Burning Plans.

Prescribed Burn Qualifications shall be updated at the same time as Wildland Fire Qualifications. An R8-FS-5100-7 shall be filled out for each person having prescribed burning Qualifications and sent to the Forest Dispatch between June 1 and June 15.

OZARK-ST. FRANCIS FORESTS PRESCRIBED BURNING CRITERIA

 

Time of Year

Orginated July, 1981

Revised August, 1983

Revised June, 1992

ITEM

NOVEMBER 1 TO MARCH 1

APRIL TO OCTOBER 31

MID FLAME WIND SPEED

1 -5 MPH

1 -5 MPH

(EYE LEVEL AT BURN SITE)

(10 MINUTE AVERAGE) / 1

(10 MINUTE AVERAGE) / 1

WIND SPEED (TRANSPORT)

9 + MPH

9 + MPH

RELATIVE HUMIDITY

30 - 60% /2

30 - 65% /2

TEMPERATURE

N/A - 80 / 3

N/A - 95 / 3

FUEL MOISTURE (10-HOUR)

9 - N/A% /4

9 - N/A% /4

CUMULATIVE SEVERITY INDEX

N/A - 500 /5

N/A - 500 /5

MIXING HEIGHT

1650' - 7500' /6

1650' - 7500' /6

SLOPE

25% MAXIMUM /7

25% MAXIMUM /7

 

 

APRIL-JUNE /8

Footnotes

1 Use a ten minute average, or multiply a one minute average by a factor of .7 . This factor was a result of a research paper and given to us by the NWS.

2 The Forest Supervisor may approve relative humidity down to 25%, on day of burn.

3 Temperatures over 70o for winter burns and over 85o for summer burns should be conducted with caution. There is no minimum temperature parameter, only maximum temperature shown.

4 Proceed with caution when 10-hour fuel moisture is below 12%. There is no maximum fuel moisture shown.

5 No minimum CSI, Devil's Knob weather station will be the location used for CSI, unless another location is figured from the point of zero.

6 Mixing height above 6500' is an indicator to burn with caution.

7 Steeper slopes may be burned if the slope distance is short. (2 chains or less). Burns conducted on slopes exceeding 25% for distances greater than two chains must be coordinated with the Soils and Watershed Staff Officer.

8 During the months of April, May and June, special consideration should be given to ground nesting birds within the planned burn site.